Verfahren und Färbesystem zum Färben eines optischen Glases

Verfahren zum Färben eines optischen Glases, welches ein vorbestimmtes Glasmaterial umfasst, zum Erreichen einer Zielfärbung des optischen Glases, wobei das Verfahren umfasst:- Bestimmen einer materialspezifischen Eigenfärbung des vorbestimmten Glasmaterials;- Bestimmen einer Glasdicke an einer Vielzahl von Auswertungsstellen auf dem optischen Glas;- Ermitteln einer Eigenfärbung des optischen Glases aus der materialspezifischen Eigenfärbung des vorbestimmten Glasmaterials und der Glasdicke an der Vielzahl von Auswertungsstellen auf dem optischen Glas;- Bestimmen einer Referenzfarbpigmentmenge für zumindest ein Farbpigment derart, dass die Referenzfarbpigmentmenge auf einem Referenzsubstrat aufgebracht für das Referenzsubstrat die am optischen Glas zu erreichende Zielfärbung bewirkt;- Festlegen eines Farbkorrekturmodells, welches einen Zusammenhang zwischen einer Abweichung einer Farbpigmentmenge für zumindest ein Farbpigment von der Referenzfarbpigmentmenge des zumindest einen Farbpigments ...

Detektorvorrichtung und Verfahren zur Fernanalyse von Stoffen sowie mobiles Sensorsystem

Die Erfindung betrifft eine Detektorvorrichtung (100) zur Fernanalyse von Stoffen, insbesondere Gefahrstoffen, umfassend wenigstens einen Laser (10), welcher zum Einstrahlen von gepulstem Laserlicht (60) auf eine in einer Detektionsentfernung (d) befindlichen Probe (16) ausgebildet ist, ein Teleskop (18), welches zum Sammeln und/oder Fokussieren von an der Probe (16) gestreutem Laserlicht (62) sowie zum Weiterleiten des gestreuten Laserlichts (62) in ein optisches Spektrometer (22) ausgebildet ist. Das optische Spektrometer (22) ist zur spektralen Analyse des an der Probe (16) gestreuten Laserlichts (62) ausgebildet. Auf den Laser (10) folgen ein erster Strahlengang mit einem ersten Referenzstrahl (64) und ein weiter Strahlengang mit einem zweiten Referenzstrahl (66) für das Laserlicht (62). Eine Einheit (46) ist zur Bestimmung einer Zeitdifferenz zwischen Pulsen des ersten Referenzstrahls (64) und Pulsen des zweiten Referenzstrahls (66) vorgesehen, wobei aus der Zeitdifferenz die Detektionsentfernung ...

Spectral analysis of a sample

Spectral analysis of a sample, for example Raman spectroscopy of pharmaceutical dosage forms e.g. tablets or capsules, uses delivery optics 16 to direct probe light to a region 13 of the sample 12, collection optics 20 to collect probe light scattered from a region 17 of the sample, and a spectrometer 26 having an entrance port 28, the spectrometer receiving the collected probe light from the collection optics at the entrance port, and detecting spectral features in the received probe light. The collection optics comprise Koehler integration optics 100 to process the collected probe light such that the collected light from each point of the collection region is distributed across the entrance port of the spectrometer. The collection optics may include an optical fibre bundle 32, collimator lenses and spectral filters. The spectral filters may block wavelengths of the probe light but allow Raman scattered wavelengths to pass.

Diagnostic testing method for a spectrometer

SPEKTROMETER

The invention relates to a spectrometer (1) for examining the substances a fluid (2) contains, having a housing (3) with a light source (4) arranged therein and a detector (5) arranged therein, wherein the light from the light source (4) with a specified spectral range (??) is guided through a transmitting window (7) through the fluid (2) to be examined and through a receiving window (8) to the detector (5), wherein the light source (4) is formed by a plurality of light-emitting diodes (10) which are connected to control electronics (11) and are configured for emitting light of different wavelength ranges (??i) within the specified spectral range (??). In order to provide as cost-effective a spectrometer (1) as possible with a small structural size, provision is made for the detector (5) to be configured for receiving the light in the entire specified spectral range (??) and for the control electronics (11) to be configured for sequentially actuating the light-emitting diodes (10), and ...

Alignment assembly and method for multi-spectral optical systems

Aspects are generally directed to an alignment assembly and method for aligning a multispectral optical system. The alignment assembly includes an illumination source (110) configured to emit illumination in a first spectral band, and a first plate (105) having a plurality of apertures formed in a reflective surface thereof. The reflective surface of the first plate is disposed to reflect the illumination emitted by the illumination source. The alignment assembly also includes a second plate (115) positioned proximate to the first plate and spaced apart from the first plate to define a gap (121) between the first plate and the second plate, the first plate being interposed between the second plate and the illumination source, and a heating element (120) coupled to the second plate and configured to heat the second plate to emit thermal infrared radiation, from the second plate, in a second spectral band.

Method and apparatus for the monitoring and control of combustion

FOURIER TRANSFORM MULTI-CHANNEL SPECTRAL IMAGER

L'invention concerne un spectro-imageur(100), le dispositif comprenant: -un photo détecteur (120) comprenant une pluralité de sites photosensibles affleurant une surface photosensible (121), -une lentille collimatrice (110) comprenant un plan focal intermédiaire (130), -un réseau d'interféromètres à deux ondes majoritaires (140), comprenant chacun un cavité délimitée par deux faces, -un réseau de microlentilles (150) agencées dans un plan parallèle à la surface photosensible (121), Chaque microlentille étant appariée à un interféromètre pour former une paire optique, comprenant un plan focal image coïncidant avec la surface photosensible (121), et étant en regard d'une section de la surface photosensible (121).

APPARATUS AND METHOD FOR CALIBRATING MEASURING INSTRUMENTS

A method and apparatus is provided for implementing a parametric down-conversion (PDC)-based calibration comprising calibrating a measuring instrument; disposing a pinhole at a position of a light-emitting sample for which the measuring instrument needs to be calibrated; irradiating a nonlinear crystal with a light source; setting the nonlinear crystal by ensuring a phase-matching wavelength of the nonlinear crystal is set at one boundary of a desired bandwidth; acquiring one or more PDC spectrums by the measuring instrument; obtaining peak values and their corresponding wavelengths from each acquired spectrum; and obtaining a response function based on the peak values and corresponding wavelengths.

COLLISIONAL BROADENING COMPENSATION USING REAL OR NEAR-REAL TIME VALIDATION IN SPECTROSCOPIC ANALYZERS

Validation verification data quantifying an intensity of light reaching a detector of a spectrometer from a light source of the spectrometer after the light passes through a validation gas across a known path length can be collected or received. The validation gas can include an amount of an analyte compound and an undisturbed background composition that is representative of a sample gas background composition of a sample gas to be analyzed using a spectrometer. The sample gas background composition can include one or more background components. The validation verification data can be compared with stored calibration data for the spectrometer to calculate a concentration adjustment factor, and sample measurement data collected with the spectrometer can be modified using this adjustment factor to compensate for collisional broadening of a spectral peak of the analyte compound by the background components. Related methods, articles of manufacture, systems, and the like are described.

SPECTROSCOPIC ANALYSIS

A method and analyser for identifying or verifying or otherwise characterising a sample comprising: using or having an electromagnetic radiation source for emitting electromagnetic radiation in at least one beam at a sample, the electromagnetic radiation comprising at least two different wavelengths, using or having a sample detector that detects affected electromagnetic radiation resulting from the emitted electromagnetic radiation affected by the sample and provides output representing the detected affected radiation, and using or having a processor for determining sample coefficients from the output, and identifying or verifying or otherwise characterising the sample using the sample coefficients and training coefficients determined from training samples, wherein the coefficients reduce sensitivity to a sample retainer variation and/or are independent of concentration.

METHOD FOR ENHANCING PERFORMANCE OF DETECTING A MULTISPECTRAL IMAGING SYSTEM

DEVICE FOR DENTAL USE FOR DISCRIMINATING THE COLOR OF TEETH

Dispositif (1) pour utilisation dentaire pour discriminer la couleur de dents, qui comprend : un téléphone cellulaire (2) ayant un appareil photo/caméra numérique (20) comprenant un objectif (21) et une source de lumière (22) servant de flash, un étui (3), un espaceur (7) monté sur l'étui en correspondance de l'objectif et de la source de lumière, des premier et second filtres de polarisation (4, 5) disposés à l'intérieur de l'espaceur, respectivement sur ledit objectif et ladite source de lumière, une étiquette d'étalonnage (8) disposée dans l'espaceur, une base de données (100) contenant une pluralité d'images d'échantillon numériques qui définissent de manière univoque des couleurs d'échantillon, et un logiciel de comparaison (101) pour comparer l'image numérique de la dent prise avec le dispositif (1) auxdites images d'échantillon de la base de données (100) pour discriminer la couleur de la dent photographiée.

POLYAMIDE, COMPOSITION COMPRISING SUCH A POLYAMIDE AND USES THEREOF.

PLASMA DIAGNOSTIC SYSTEM USING MULTI-ROUND PATH THOMSON SCATTERING

The present invention relates to a plasma diagnostic system using multi-round path Thomson scattering. The system comprises: an optical system using a laser beam pulse provided from a light source to sequentially provide vertically and horizontally polarized laser beam pulses; a beam collection system measuring a first beam collection signal scattered in plasma when the vertically polarized laser beam pulse provided from the optical system is collimated, and measuring a second beam collection signal excited in the plasma when the horizontally polarized laser beam pulse provided from the optical system is collimated; and a control unit to measure a Thomson scattering signal with respect to the plasma by using the first and second beam collection signals measured by the beam collection system. The first beam collection signal is a signal formed by mixing the Thomson scattering signal and a background scattering noise signal, and the second beam collection signal is composed of the background ...

분광기를 이용하여 특수 설계된 패턴 폐루프 보정에 의한 고 정확도의 영상 색도계

... 본 명세서는 보다 정확한 출력을 포함할 수 있는 광대역 색도계를 제공하는 방법에 관한 다양한 실시예들을 설명한다. 일실시예에서, 분광계 또는 분광기 등의 협대역 장비는 광대역 색도계의 보정에 사용될 수 있고, 따라서 더 정확한 출력이 제공될 수 있다. 일실시예에서, 광대역 색도계 및 협대역 분광기로 구성된 광 테스트 장비는 보다 정확하게 보정된 광대역 색도계를 제공하는데 사용될 수 있다. 예로서, 광대역 색도계 및 협대역 분광기로 구성된 하이브리드 시스템인 스펙트럼 카메라는 광대역 색도계 및 협대역 분광기에 의한 동시 테스트에 사용될 수 있다. 통시 테스트에 의해 광대역 색도계의 정확한 보정이 달성될 수 있다. 본 명세서는 협대역 다중 채널 분광계를 갖는 광대역 세 채널 색도계를 특징화하는 수학적 모델을 더 기술한다.

분광 휘도계의 교정에 사용하는 기준 광원 장치 및 그것을 사용하는 교정 방법

... 휘도 기준면에 있어서의 휘도 불균일을 저감시킨다. 개구인 휘도 기준면 (18) 을 구비하는 적분구 (12) 와, 상기 적분구 (12) 의 외벽 (12b) 에 서로 이간되어 형성되고, 상기 적분구 (12) 의 내부에 파장 특성이 동등한 광을 각각 입사하는 복수의 제 1 광 포트 (14a), (14b) 를 포함하는 분광 휘도계 (40) 의 교정에 사용하는 기준 광원 장치 (10) 가 제공된다. 상기 복수의 제 1 광 포트 (14a), (14b) 는, 상기 적분구 (12) 의 외벽 (12b) 에 있어서의, 상기 휘도 기준면 (18) 의 중심으로부터의 거리가 동등하고, 상기 휘도 기준면 (18) 의 중심을 통과하는 상기 적분구 (12) 의 회전 대칭축 (R) 에 대해 회전 대칭성을 갖는 복수 위치에 형성되어도 된다.

반사판 기반 레이저 감지 장치 및 그의 외란광 노이즈 제거 방법

... 반사판 기반 레이저 감지 장치는 정해진 파장의 레이저 신호를 송출하고, 상기 레이저 신호가 반사판에 의해 반사되어 되돌아오는 반사 펄스 신호를 포함하는 수신 신호로부터 상기 정해진 파장을 포함하는 제1 파장대역의 신호와 상기 제1 파장대역에 인접한 제2 파장대역의 신호를 검출하며, 상기 제2 파장대역의 신호를 이용하여 상기 제1 파장대역의 신호에서 상기 제1 파장대역의 외란광 노이즈를 제거하여 상기 반사 펄스 신호를 검출한다. 그리고 검출된 상기 반사 펄스 신호의 SNR(Signal-to-noise ratio)을 토대로 상기 제2 파장대역의 신호를 제어하여 상기 반사 펄스 신호의 SNR이 최적화시킨다.

METHOD AND DEVICE FOR MEASURING THE CONCENTRATION OF SUBSTANCES IN GASEOUS OR FLUID MEDIA THROUGH OPTICAL SPECTROSCOPY USING BROADBAND LIGHT SOURCES

The invention relates to a method and to a device for using partially non-stabilized broadband light sources to accurately measure partially broadband-absorbing substances using referencing measuring cells. In order to create a low-cost, high-resolution, and at the same time fast spectrographic device for measuring concentrations of substances in fluid or gaseous media that is also suitable for harsh environments, the light radiated by the broadband light sources (1) through light guiding optical systems is fed through the measuring section of the self-referencing measuring cell (20, 30, 40) or only partially through a measuring cell (10) to a measurement detector (photoreceptor 11) and partially through a reference path (optical waveguide 8) to a reference detector (photoreceptor 15), and a mode coupler (5, 9, 14) is associated with each optical waveguide (2, 4, 7, 8) in order to homogenize the radiation characteristic of the broadband light sources (1), which varies over time and space ...

TUNABLE COHERENT LIGHT FILTER FOR OPTICAL SENSING AND IMAGING

Systems and methods are provided for filtering coherent infrared light from a thermal background for protection of infrared (IR) imaging arrays and detection systems. A Michelson interferometer is used for coherent light filtering. In an implementation, a system includes a fixed mirror, a beam splitter, and a moving mirror which can be controlled translationally, as well as tip/tilt. The Michelson interferometer may be used as an imaging system. For imaging applications, a system may comprise a tunable array of micro-electromechanical systems (MEMS) mirrors. A mid-wave IR interferometer with electronic feedback and MEMS mirror array is provided.

Calibration apparatus, calibration method, spectral camera, and display apparatus

There is provided a calibration apparatus including one or a plurality of first processors programmed to: obtain spectrum images from a spectral camera that images light from alight source portion; obtain a spectral reference value from a measurement result of a calibration reference device that measures the light; extract a gradation value at a correction point that is a pixel which generates a correction matrix among the spectrum images as a measurement value; divide the measurement value at the correction point and the spectral reference value by a luminance value of the light emitted from the light source portion to obtain a normalized measurement value and a normalized reference value; and calculate the correction matrix based on the normalized measurement value and the normalized reference value.

Method And Apparatus For The Monitoring And Control Of A Process

A diode laser spectroscopy gas sensing apparatus having a diode laser with a select lasing frequency, a pitch optic coupled to the diode laser with the pitch optic being operatively associated with a process chamber and oriented to project laser light along a projection beam through the process chamber. This embodiment additionally includes a catch optic in optical communication with the pitch optic to receive the laser light projected through the process chamber and an optical fiber optically coupled to the catch optic. In addition, the catch optic is operatively associated with a catch side alignment mechanism which provides for the alignment of the catch optic with respect to the projection beam to increase a quantity of laser light received by the catch optic from the pitch optic and coupled to the optical fiber and a detector sensitive to the select lasing frequency optically coupled to the optical fiber. The catch side alignment mechanism may consist of means to tilt the catch optic ...

Color measurement device and image forming apparatus

The color measurement device and an image forming apparatus using the same includes a light source for irradiating a color measurement object with white light; a diffraction grating for dispersing the light reflected from the color measurement object; and a line sensor formed of multiple pixels that generate an electric signal corresponding to the intensity of the light dispersed by the diffraction grating, wherein the light source includes a light-emitting diode having a peak value of emission intensity in a wavelength zone of 380 nm to 420 nm, and a plural types of fluorescent members each having a peak value of fluorescence intensity in a wavelength zone of 420 nm to 730 nm.

Apparatus and method for measuring optical characteristics of an object

Color measuring systems and methods are disclosed. Perimeter receiver fiber optics are spaced apart from a central source fiber optic and receive light reflected from the surface of the object being measured. Light from the perimeter fiber optics pass to a variety of filters. The system utilizes the perimeter receiver fiber optics to determine information regarding the height and angle of the probe with respect to the object being measured. Under processor control, the color measurement may be made at a predetermined height and angle. Various color spectral photometer arrangements are disclosed. Translucency, fluorescene and/or surface texture data also may be obtained. Audio feedback may be provided to guide operator use of the system. The probe may have a removable or shielded tip for contamination prevention.

Colour Measurement Method and Colour Measurement Device

A colour measurement device includes a measurement array (MA) which includes: a plurality of illumination arrays (20, 30, 40) for exposing a measurement spot (MS) on a measurement object (MO) to illumination light in an actual illumination direction (2, 3, 4) in each case, and a pick-up array (50) for detecting the measurement light reflected by the measurement spot (MS) in an actual observation direction (5) and for converting it into preferably spectral reflection factors; and a controller for the illumination arrays and the pick-up array and for processing the electrical signals produced by the pick-up array. The controller is embodied to process the measured reflection factors on the basis of a correction model, such that distortions in the measurement values as compared to nominal illumination and/or observation directions, caused by angular errors in the illumination arrays and/or the pick-up array, are corrected.

Variable modulation of radiation and components

Various embodiments include systems and methods to provide selectable variable gain to signals in measurements using incident radiation. The selectable variable gain may be used to normalize signals modulated in measurements using incident radiation. The selectable variable gain may be attained using a number of different techniques or various combinations of these techniques. These techniques may include modulating a modulator having modulating elements in which at least one modulating element acts on incident radiation differently from another modulating element of the modulator, modulating the use of electronic components in electronic circuitry of a detector, modulating a source of radiation or combinations thereof. Additional apparatus, systems, and methods are disclosed.

SPECTROMETRY METHOD AND SPECTROMETRY APPARATUS

A spectrometry method used by a spectrometry apparatus including a spectrometry section including a spectrometer and an imaging device that captures a spectroscopic image, a spectroscopic controller that controls the action of the spectrometer, and an image generator that generates the spectroscopic image, the method including generating the spectroscopic image, dividing the range of the spectroscopic image into a plurality of regions including at least a first region, determining a reference value of a color value, generating a first region spectrum based on the spectroscopic image of the first region, calculating first region tristimulus values based on the first region spectrum, calculating a first region color value based on the first region tristimulus values, and calculating a first region color difference that is the color difference between the first region color value and the reference value by using a color difference formula.

DIVIDED-APERTURE INFRA-RED SPECTRAL IMAGING SYSTEM

Various embodiments disclosed herein describe a divided-aperture infrared spectral imaging (DAISI) system that is adapted to acquire multiple IR images of a scene with a single-shot (also referred to as a snapshot). The plurality of acquired images having different wavelength compositions that are obtained generally simultaneously. The system includes at least two optical channels that are spatially and spectrally different from one another. Each of the at least two optical channels are configured to transfer IR radiation incident on the optical system towards an optical FPA unit comprising at least two detector arrays disposed in the focal plane of two corresponding focusing lenses. The system further comprises at least one temperature reference source or surface that is used to dynamically calibrate the two detector arrays and compensate for a temperature difference between the two detector arrays.

HANDHELD LIBS ANALYZER END PLATE PURGING STRUCTURE

A handheld LIBS analyzer includes a laser source for generating a laser beam and a spectrometer subsystem for analyzing a plasma generated when the laser beam strikes a sample. A nose section includes an end plate with an aperture for the laser beam, a purge cavity behind the aperture fluidly connected to a source of purge gas, and a shield covering the purge cavity. A vent removes purge gas from the purge cavity when the end plate is placed on the sample. 1. A handheld LIBS analyzer comprising:a laser source for generating a laser beam;a spectrometer subsystem for analyzing a plasma generated when the laser beam strikes a sample; and an end plate with an aperture for the laser beam,', 'a purge cavity behind the aperture fluidly connected to a source of purge gas,', 'a shield covering the purge cavity, and', 'a vent for removing purge gas from the purge cavity when the end plate is placed on the sample., 'a nose section including2. The analyzer of in which the vent includes a channel in a front face of the end plate extending from the aperture.3. The analyzer of in which said channel extends on opposite sides of the aperture to opposing edges of the end plate.4. The analyzer of in which the rear of the end plate includes a rearwardly extending enclosure defining the purge cavity.5. The analyzer of in which the enclosure includes at least one side opening for receiving the purge gas.6. The analyzer of in which the enclosure includes a top rim for seating the shield thereon.7. The analyzer of in which the purge cavity includes a calibration standard therein.8. The analyzer of in which the calibration standard is located on a rear surface of the end plate.9. The analyzer of in which the end plate serves as the calibration standard.10. The analyzer of in which there are two or more calibration standards located on opposite sides of the laser aperture.11. A handheld LIBS spectrometer comprising:a housing; a laser focusing lens, and', 'a detection lens;, 'an optics stage ...

DEVICE FOR MEASURING A FLUX OF MATTER BY ABSORPTION OF LIGHT, AND CORRESPONDING MEASURING METHOD

WINDOW OBSCURATION SENSORS FOR MOBILE GAS AND CHEMICAL IMAGING CAMERAS

СПОСОБ ИЗМЕРЕНИЯ КОНЦЕНТРАЦИИ УРАНА В ВОДНОМ РАСТВОРЕ МЕТОДОМ СПЕКТРОФОТОМЕТРИИ

Изобретение относится к способу измерения концентрации урана в водном растворе, включающему в себя следующие последовательные этапы: a) электрохимическое восстановление до валентности IV урана, присутствующего в водном растворе с валентностью выше IV, причем это восстановление осуществляют при pH<2 путем пропускания электрического тока в раствор; b) измерение оптической плотности раствора, полученного по завершении этапа a), на выбранной длине волны между 640 и 660 нм, а предпочтительно - 652 нм; и c) определение концентрации урана в водном растворе путем выведения концентрации урана валентности (IV), присутствующего в водном растворе, полученном по завершении этапа a), из результата измерения оптической плотности, полученного на этапе b). Изобретение позволяет снизить чувствительность к присутствию ионов в растворе, не требует использования дополнительных химических реагентов, имеет возможность автоматизации. 2 н. и 8 з.п. ф-лы, 6 ил., 3 табл.

Einrichtung zur Spektralanalyse.

Verfahren und Anordnung zur Korrektur fertigungsprozessbedingter Exemplarstreuungen von mit Spektralfiltern versehenen optischen Sensoren (Ultra MTCS)

Die Erfindung betrifft ein Verfahren und Anordnungen zur Korrektur fertigungsprozessbedingter Exemplarstreuungen von mit Spektralfiltern versehenen optischen Sensoren. Die Aufgabe der Korrektur fertigungsprozessbedingter Exemplarstreuungen von mit Spektralfiltern versehenen optischen Sensoren wird erfindungsgemäß gelöst, indem Sensoren mit wenigstens einem Spektralfilter, der eine gauß-ähnliche Filterfunktion aufweist, mindestens zwei Ersatzkanäle (6, 7) mit spektral gegensätzlich von der Zentralwellenlänge (11) der spektralen Zielfunktion (1) abweichenden Ersatzfunktionen (21, 31) aufweist, wobei die Ersatzkanäle (6, 7) jeweils ein Spektralfilter (61, 71, 62) zur Realisierung einer der gegensätzlich abweichenden Ersatzfunktionen (2, 3) mit einer maximal tolerierter Exemplarstreuung kleiner als ±a, ±b der Ersatzfunktionen von der spektralen Zielfunktion (1) ist, aufweisen, und die mit den gegensätzlich abweichenden Ersatzfunktionen (2, 3) gefilterten Signale der Ersatzkanäle (6, 7) Mitteln ...

Logging system and method for in-situ fluids sensing through optical fiber with attenuation compensation

Background correction in emission spectra

Opticoanalytical devices with capacitance-based nanomaterial detectors

A Device for measuring colour properties

Method and device for measuring the concentration of substances in gaseous or fluid media through optical spectroscopy using broadband light sources

Diffuse Reflectance Spectroscopy

MEASURING INSTRUMENT FOR AN OPTICAL SPECTROMETER

Method of measuring the uranium concentration of an aqueous solution by spectrophotometry

The invention relates to a method of measuring the uranium concentration of an aqueous solution, comprising the following successive steps: a) the electrochemical reduction to valence IV of the uranium present in the aqueous solution at a valence above IV, this reduction being carried out at pH < 2 and by passing an electric current through the solution; b) the measurement of the absorbance of the solution obtained on conclusion of step a) at a wavelength chosen between 640 and 660 nm, preferably at 652 nm; and c) the determination of the uranium concentration of the aqueous solution by deduction from the uranium concentration of valence (IV) present in the aqueous solution obtained on completion of step a) from the measurement of the absorbance obtained in step b).

SPECTROSCOPE AND METHOD OF PERFORMING SPECTROSCOPY

A spectroscope designed to utilize an adaptive optical element such as a micro mirror array (MMA) and two distinct light channels and detectors. The devices can provide for real-time and near real-time scaling and normalization of signals.

SPECTROSCOPY HAVING CORRECTION FOR BROADBAND DISTORTION FOR ANALYZING MULTI-COMPONENT SAMPLES

A spectroscopic method (100) and spectroscopy system (200) therefrom for analyzing samples (298). A sample includes a first chemical component that has a characteristic first absorption peak is provided (101). The sample is irradiated (102) in a measurement waveband proximate to the first absorption peak, and at a first and a second reference waveband where the first chemical component lacks characteristic absorption features. Reflected or transmitted detection data is obtained (103) including a measured power proximate to the first absorption peak and first and second reference powers at the reference wavebands. A plurality of different waveband ratios are evaluated (104) using pairs of detection data to generate a plurality of measured waveband ratio values. A parameter of the first chemical component is then determined (105) by evaluating a multidimensional polynomial calibration equation that relates the parameter of the first chemical component to the plurality of different waveband ...

HAND-HELD, SELF-CONTAINED OPTICAL EMISSION SPECTROSCOPY (OES) ANALYZER

A hand-held, self-contained, battery-powered test instrument for analyzin g composition of a sample includes an exciter for exciting at least a portio n of the sample, a compact cross-dispersed spectrometer for receiving an opt ical signal from the excited portion of the sample and a processor for proce ssing spectral data about the optical signal from the spectrometer. The exci ter may include a spark generator and a counter electrode, a laser or other device for generating the optical signal from the sample portion. The spectr ometer has a wavelength range broad enough to enable the test instrument to detect and determine relative quantities of carbon, phosphorous, sulfur, man ganese, silicon, iron and other elements necessary to identify common alloys . The spectrometer includes a structural member made of a light-weight mater ial having a small coefficient of thermal expansion (CTE). The spectrometer is dimensionally stable over a range of expected ambient temperatures, witho ut controlling ...

IN-SITU SPECTRAL PROCESS MONITORING

Increasing the precision of process monitoring may be improved if the sensors take the form of travelling probes riding along with the flowing materials in the manufacturing process rather than sample only when the process moves passed the sensors fixed location. The probe includes an outer housing hermetically sealed from the flowing materials, and a light source for transmitting light through a window in the housing onto the flowing materials. A spatially variable optical filter (spf) captures light returning from the flowing materials, and separates the captured light into a spectrum of constituent wavelength signals for transmission to a detector array, which provides a power reading for each constituent wavelength signal.

Method, device, system and equipment for calculating dark background value of infrared detector and medium

METHOD AND APPARATUS FOR THE MONITORING AND CONTROL OF COMBUSTION

A sensing apparatus consisting of more than one diode laser having select lasing frequencies, a multiplexer optically coupled to the outputs of the diode lasers with the multiplexer being further optically coupled to a pitch side optical fiber. Multiplexed laser light is transmitted through the pitch side optical fiber to a pitch optic operatively associated with a process chamber which may be a combustion chamber or the boiler of a coal or gas fired power plant. The pitch optic is oriented to project multiplexed laser output through the process chamber. Also operatively oriented with the process chamber is a catch optic in optical communication with the pitch optic to receive the multiplexed laser output projected through the process chamber. The catch optic is optically coupled to an optical fiber which transmits the multiplexed laser output to a demultiplexer. The demultiplexer demultiplexes the laser light and optically couples the select lasing frequencies of light to a detector with ...

Spectral properties-based system and method for feeding masterbatches into a plastic processing machine

Disclosed is a system for optimizing a match between the color of an in-line part manufactured by a plastic product production machine and the color of a reference part by adjusting the concentration of masterbatch in the mixture of raw material fed to the plastic product production machine. The optimization of the color is based on interlaced spectra of the in-line part and reference part obtained using the same spectrometer, thereby eliminating the requirement for high accuracy spectrometer calibration and allowing a controller of the system to determine the rates at which the base masterbatches are added to the raw material in real time on the manufacturing floor while the plastic product production machine is being operated to manufacture in-line parts.

RAMAN SPECTROSCOPIC DETECTION METHOD

Embodiments of the present invention provide a Raman spectroscopic inspection method, comprising the steps of: measuring a Raman spectrum of an object to be inspected successively to collect a plurality of Raman spectroscopic signals; superposing the plurality of Raman spectroscopic signals to form a superposition signal; filtering out a florescence interfering signal from the superposition signal; and identifying the object to be inspected on basis of the superposition signal from which the florescence interfering signal has been filtered out. By means of the above method, a desired Raman spectroscopic signal may be acquired by removing the interference caused by a florescence signal from a Raman spectroscopic inspection signal of the object. It may inspect correctly the characteristics of the Raman spectrum of the object so as to identify the object effectively. 1. A Raman spectroscopic inspection method , comprising the steps of:(a) measuring a Raman spectrum of an object to be inspected successively to collect a plurality of Raman spectroscopic signals;(b) superposing the plurality of Raman spectroscopic signals to form a superposition signal;(c) filtering out a florescence interfering signal from the superposition signal; and(d) identifying the object to be inspected on basis of the superposition signal from which the florescence interfering signal has been filtered out.2. The Raman spectroscopic inspection method according to claim 1 , wherein the step (c) comprises:(c1) acquiring a plurality of numerical sample points of the superposition signal, the number of the numerical sample points meeting the requirement of the sampling theorem;(c2) calculating the florescence interfering signal by iteration on basis of the plurality of numerical sample points of the superposition signal; and(c3) subtracting the florescence interfering signal from the superposition signal.4. The Raman spectroscopic inspection method according to claim 1 , wherein the method claim 1 , ...

Methods for Color Sensing Ambient Light Sensor Calibration

An electronic device may be provided with a color sensing ambient light sensor. The color sensing ambient light sensor may measure the color of ambient light. Control circuitry in the electronic device may use information from the color sensing ambient light sensor in adjusting a display in the electronic device or taking other action. The color sensing ambient light sensor may have light detectors with different spectral responses. A test system may be used to calibrate the color sensing light sensor. The test system may have a tunable light source with light-emitting diodes that are turned on in sequence while gathering measured responses from the detectors. Numerical optimization techniques may be used to produce final versions of the spectral responses for the light detectors from the measured responses and corresponding calibration data that is stored in the electronic device. 1. A method for calibrating an electronic device having a color sensing ambient light sensor with light detectors having different spectral responses using a test system having a tunable light source and control circuitry , comprising:with the tunable light source, supplying test light over a range of wavelengths;while exposed to the test light, gathering measured response data from each of the detectors with the control circuitry; andapplying numerical optimization techniques implemented on the control circuitry to process the gathered measured response data to determine a spectral response for each of the detectors.2. The method defined in further comprising:with the control circuitry, using the spectral responses of the detectors to store corresponding calibration data in the electronic device.3. The method defined in wherein applying the numerical optimization techniques comprises making an initial estimate of each spectral response and using an iterative process to refine each initial estimate.4. The method defined in wherein applying the numerical optimization techniques comprises: ...

COLOR SENSING AMBIENT LIGHT SENSOR CALIBRATION

Sensor calibration methods and systems can for providing accurate color values are disclosed. In one example, a method includes obtaining color measurements that indicate an amount of ambient light, as well as clustering the color measurements, and storing cluster parameters for the clustered color measurements. The method can further include automatic calculation of, for each cluster, generic transformation parameters for conversion of a color measurement to a calibrated color value. In another example, a method can include exposing a light sensor to a calibration ambient lighting, calculating sensor correction parameters for the light sensor, and storing the calculated parameters. As an additional example, an electronic device is adapted to determine calibrated color values with machine readable media storing cluster parameters, sensor correction parameters, and generic transform parameters used by the electronic device to calculate calibrated color values for ambient light sensor measurements ...

IN-SITU SPECTRAL PROCESS MONITORING

Increasing the precision of process monitoring may be improved if the sensors take the form of travelling probes riding along with the flowing materials in the manufacturing process rather than sample only when the process moves passed the sensors fixed location. The probe includes an outer housing hermetically sealed from the flowing materials, and a light source for transmitting light through a window in the housing onto the flowing materials. A spatially variable optical filter (SVF) captures light returning from the flowing materials, and separates the captured light into a spectrum of constituent wavelength signals for transmission to a detector array, which provides a power reading for each constituent wavelength signal.

Path fluctuation monitoring for frequency modulated interferometer

A method is presented for determining path length fluctuations in an interferometer using a reference laser with an arbitrary frequency with respect to the measured light. The method includes: injecting reference light along signal paths of the interferometer; measuring interference between the reference light at an output of the interferometer; determining an optical phase difference between the reference light in the two signal paths of the interferometer by measuring intensity modulation of the interference between the reference light and subtracting an intended frequency modulation from the measured intensity modulation; accumulating an unwrapped phase difference between the reference light in the two signal paths of the interferometer, where the unwrapped phase difference is defined in relation to a reference; and determining path length fluctuation of light in the interferometer using the unwrapped phase difference.

Method of calibrating spectral apparatus and method of producing calibrated spectral apparatus

Creating a model calibrating spectral apparatus having an optical system that converts light to be measured into a spectrum, and a light-receiving sensor including a plurality of sensors that outputs signals, the sensors include sensors that output signals indicating respective energy amounts of a plurality of wavelength components. The model shows where a linear function of an indicator indicating a mechanical error in the spectral apparatus, expresses deviation of an indicator indicating spectral sensitivity of the sensor from the indicator indicating the reference spectral sensitivity of the sensor. The method comprises: a) acquiring reference spectral sensitivity; b) acquiring an indicator indicating the reference spectral sensitivity of the sensor acquired at a); and c) creating the model where the linear function of the mechanical error indicator expresses deviation of the spectral sensitivity indicator from the indicator indicating the reference spectral sensitivity of the sensor ...

METHOD FOR FABRICATING AN OPTICAL SOURCE FOR CALIBRATING AN OPTICAL SYSTEM

A method for fabricating an optical source for calibrating an optical system is provided. The method includes determining a form factor for an optical source based on a point of detection of an optical system corresponding to a region where an optical signal of the optical system interacts with a sample. The method also includes providing an envelope in a size and shape to fit the form factor. The method also includes providing a plurality of electrodes connected to the envelope for connection to a power source and filling the envelope with a gas. The optical source formed from the above method is also provided.

Multiple-wavelength spectroscopic apparatus

In a multi-wavelength spectroscopic apparatus using diffraction gratings, a first diffraction grating is a diffraction grating with diffraction efficiencies of p-polarized light and s-polarized light being equal on a short wavelength side of an operating wavelength range, and a second diffraction grating is a diffraction grating with diffraction efficiencies of p-polarized light and s-polarized light being equal on a long wavelength side of an operating wavelength range. By performing dispersion with two such diffraction gratings, it is possible to enlarge the amount of angular dispersion, and to produce a spectroscopic apparatus, which cancels wavelength dependencies of the diffraction efficiencies and has a small wavelength dependency of the diffraction efficiency.

SPECTRAL CHARACTERISTIC MEASURING DEVICE, METHOD FOR CORRECTING SPECTRAL CHARACTERISTIC MEASURING DEVICE, AND PROGRAM

The purpose is to rapidly and easily correct a spectral characteristic measuring device regardless of the change in spectral distribution of a monochromatic light for correction. To achieve the object, a spectral characteristic measuring device includes a spectrometer and a control device. In the spectrometer, the light passed through an opening of a light shielding body is dispersed by an optical system and irradiated on a light receiving unit in which a plurality of light receiving elements are arrayed to form a dispersion image. In the control device, wavelength information indicating a correspondence relationship between the plurality of light receiving elements and wavelengths of pieces of lights is stored, where first and second intensity distributions of the light related to first and second dispersion images are acquired based on a signal outputted from each of the light receiving elements when the monochromatic light is passed through the opening and first and second dispersion ...

RADIOMETRIC CALIBRATION METHOD AND DEVICE

SPECTROPHOTOMETER AND METHOD FOR MEASURING PERFORMANCE THEREOF

PROBLEM TO BE SOLVED: To provide a spectrophotometer that uses an xenon flash lamp and enables collation with past accumulated data, and to provide a method for measuring performance of the spectrophotometer. SOLUTION: Usually, spectroscopic analysis is performed by using a luminous flux 2 from the xenon flash lamp 1, dispersing it to any wavelength with a spectroscope 4 via a concave mirror 3, and detecting the luminous flux passing through a sample 5 with a photodetector 6. When the performance is measured, a low pressure mercury lamp 9 is arranged on the luminous flux 2 between the xenon flash lamp 1 and spectroscope 4, a light shield plate 11 constituting a shutter mechanism is operated to shield or transmit light, and light intensity is detected, thereby measuring "wavelength accuracy" or "resolution" using the bright-line spectrum of the low pressure mercury lamp 9. COPYRIGHT: (C)2011,JPO&INPIT ...

МНОГОКАНАЛЬНОЕ СПЕКТРАЛЬНОЕ УСТРОЙСТВО ПОЛУЧЕНИЯ ИЗОБРАЖЕНИЙ С ПРЕОБРАЗОВАНИЕМ ФУРЬЕ

Группа изобретений относится к многоканальному спектральному устройству получения изображений с преобразованием Фурье. Многоканальное спектральное устройство получения изображений с преобразованием Фурье содержит фотодетектор, содержащий множество фоточувствительных участков, находящихся на одном уровне с фоточувствительной поверхностью, коллимационную линзу, имеющую промежуточную фокальную плоскость, набор двухлучевых интерферометров, каждый из которых содержит полость, ограниченную двумя сторонами, набор микролинз, расположенных в плоскости, параллельной фоточувствительной поверхности, при этом каждая микролинза связана с одним интерферометром, образуя оптическую пару, имеющую фокальную плоскость, совпадающую с фоточувствительной поверхностью, и находящуюся напротив секции фоточувствительной поверхности. Технический результат – повышение спектрального разрешения монохромных изображений. 3 н. 12 з.п. ф-лы, 5 ил., 7 табл.

СПОСОБ ИЗМЕРЕНИЯ КОНЦЕНТРАЦИИ УРАНА В ВОДНОМ РАСТВОРЕ МЕТОДОМ СПЕКТРОФОТОМЕТРИИ

... 1. Способ измерения концентрации урана в водном растворе, включающий в себя следующие последовательные этапы:a) электрохимическое восстановление до валентности IV урана, присутствующего в водном растворе с валентностью выше IV, причем это восстановление осуществляют при pH<2 путем пропускания электрического тока в раствор;b) измерение оптической плотности раствора, полученного по завершении этапа a), на выбранной длине волны между 640 и 660 нм; иc) определение концентрации урана в водном растворе путем выведения концентрации урана валентности (IV), присутствующего в водном растворе, полученном по завершении этапа a), из результата измерения оптической плотности, полученного на этапе b).2. Способ по п. 1, в котором электрохимическое восстановление урана, присутствующего в водном растворе, осуществляют, проводя следующие последовательные этапы:- распределение раствора с pH<2 в первом (2) и втором (3) отделении электрохимической ячейки (1), причем каждое отделение содержит электрод (7; 6), ...

Устройство для освещения поверхности материала

... 1. Устройство для освещения поверхности материала, содержащееосветительное устройство (101) для освещения поверхности материала (103) калибровочным светом (105);регистрирующее устройство (107) для регистрации измеренного света (109), излучаемого поверхностью материала (103) в ответ на калибровочный свет (105); ипроцессорное устройство (111) для регистрации спектральной характеристики измеренного света (109), которая характеризует спектральную характеристику поверхности материала (103);при этом осветительное устройство (101) сконфигурировано для излучения освещающего света (113) для освещения поверхности материала (103), при этом освещающий свет (113) имеет спектральную характеристику, которая соответствует спектральной характеристике измеренного света (109).2. Устройство по п. 1, в котором измеренный свет (109) представляет собойсвет, отраженный от поверхности материала (103) в ответ на воздействие калибровочного света (105), илисвет, переизлучаемый поверхностью материала (103) в ответ ...

Hintergrundkorrektur in Emissionsspektren

Verfahren zum Ableiten eines hintergrundkorrigierten Bereichs eines gemessenen Emissionsspektrums, umfassend die Schritte: Identifizieren von zwei oder mehr Hintergrundkorrekturpunkten aus dem Bereich des gemessenen Emissionsspektrums; Ableiten einer Hintergrundkorrekturfunktion, die an die identifizierten Hintergrundkorrekturpunkte angepasst wird, und Anwenden der Hintergrundkorrekturfunktion an den Bereich des gemessenen Emissionsspektrums, um so einen hintergrundkorrigierten Bereich des Emissionsspektrums zu erzeugen; bei welchem der Bereich des gemessenen Emissionsspektrums gemessene Datenpunkte umfasst, die aus einer Reihe von n Intensitätswerten In bestehen, bei diskreten Wellenlängen oder Werten, die der Wellenlänge n entsprechen, wobei sich die Reihe von einem ersten gemessenen Datenpunkt zu einem letzten gemessenen Datenpunkt erstreckt, und die Hintergrundkorrekturpunkte aus den gemessenen Datenpunkten durch die folgenden Schritte identifiziert werden: (1) Identifizieren eines ...

Zweikanaliges Messgerät

Messgerät mit zwei spektralen Kanälen zur Bestimmung von Gaskonzentrationen – mit einer ersten und einer zweiten Lichtquelle (12 und 14), die Licht unterschiedlicher Wellenlängenbereiche aussenden (20 und 22), – deren Lichtstrahlen (20 und 22) auf eine optischen Einheit (24) gerichtet sind, in der die Lichtstrahlen (20 und 22) auf den gleichen optischen Pfad (26) und in eine Messstrecke (16) geführt sind, – mit einer Empfangsanordnung (36), die das Licht der Lichtquellen (12 und 14) nach Durchlaufen der Messstrecke (16) empfängt, – mit einer Auswerteeinheit (42) zur Auswertung der Empfangssignale und Bestimmung einer Gaskonzentration daraus, dadurch gekennzeichnet, – dass eine Filterradanordnung (50) vorgesehen ist, mit der Filter (G1, G2, I1, I2, K1, K2) in die beiden Strahlengänge (20, 22) der Lichtquellen (12, 14) zur Kalibrierung bzw. Funktionskontrolle eingeschwenkt werden können und – dass die Filterradanordnung (50) im Strahlengang (20, 22) zwischen den beiden Lichtquellen (12, 14 ...

Lichtquelle mit steuerbarem Spektrum

Die Erfindung betrifft eine Vorrichtung zur Erzeugung von Licht, mit – einer Mehrzahl von Lichtquellen (1), – einer die Lichtquellen (1) ansteuernden Steuereinrichtung (2) und – einer Überlagerungsoptik, die das von den Lichtquellen (1) emittierte Licht in einer Austrittsöffnung (3) überlagert. Es ist Aufgabe der Erfindung, eine gegenüber dem Stand der Technik verbesserte Vorrichtung bereitzustellen. Hierzu schlägt die Erfindung vor, dass die Überlagerungsoptik – einen ersten Hohlspiegel (4), in dessen Fokusebene sich die Lichtquellen (1) befinden, – ein optisches Gitter (5), auf das der erste Hohlspiegel (4) das von den Lichtquellen (1) emittierte Licht (6) reflektiert, und – einen zweiten Hohlspiegel (7), der das an dem optischen Gitter (5) gebeugte Licht (8) auf die im Fokus des zweiten Hohlspiegels (7) befindliche Austrittsöffnung (3) reflektiert, umfasst.

Spektroskopiemodul

Bei einem Spektroskopiemodul 1 ist eine Lichtdurchgangsöffnung 50, durch die ein zu einem spektroskopischen Abschnitt 4 vordringendes Licht L1 tritt, in einem Lichterfassungselement 5 ausgebildet. Deshalb ist es möglich, zu verhindern, dass die relative Positionsbeziehung zwischen der Lichtdurchgangsöffnung 50 und einem Lichterfassungsabschnitt 5a des Lichterfassungselements 5 abweicht. Außerdem ist das Lichterfassungselement 5 durch ein optisches Harzhaftmittel 63 mit einer vorderen Fläche 2a eines Substrats 2 verbunden. Daher ist es möglich, eine an dem Lichterfassungselement 5 wegen einer Wärmeausdehnungsdifferenz zwischen dem Lichterfassungselement 5 und dem Substrat 2 erzeugte Spannung zu verringern. Zusätzlich bedeckt die lichtdurchlässige Platte 16 einen Teil einer Lichteinfallsmündung 50a. Daher wird eine Lichteinfallsseitenoberfläche 63a des optischen Harzhaftmittels 63 in der Lichtdurchgangsöffnung 50 eine im Wesentlichen ebene Fläche. Deshalb ist es möglich, das Licht L1 geeignet ...

Logging system and method for in-situ fluids sensing through optical fiber with attenuation compensation

Opticoanalytical devices with capacitance-based nanomaterial detectors

Optical computing devices may include capacitance-based nanomaterial detectors. For example, an optical computing device may include a light source that emits electromagnetic radiation into an optical train extending from the light source to a capacitance-based nanomaterial detector; a material positioned in the optical train to optically interact with the electromagnetic radiation and produce optically interacted light; and the capacitance-based nanomaterial detector comprising one or more nano-sized materials configured to have a resonantly-tuned absorption spectrum and being configured to receive the optically interacted light, apply a vector related to the characteristic of interest to the optically interacted light using the resonantly-tuned absorption spectrum, and generate an output signal indicative of the characteristic of interest.

Raman spectrometer

A Raman spectrometer comprises laser 1001, auto-focussing system 1017 and detector 1010. Adjustable focussing element 1013 comprises e.g. objective lens 1003 and controller 1012, focussing the laser at a plurality of trial locations where a signal strength metric representative of the Raman spectrum is determined, to determine a focus location e.g. at a maximum. The metric mitigates against non-sample signals, using relative enhancement or diminution in selected wavelength ranges, for example using a mask comprising weighting values between 0 and 1, forming weighting vectors. The signal strength metric may use the second derivative of the spectrum to highlight areas with strong Raman response. The mask may be determined combining a negative mask representing wavelengths with strong Raman response of a containing material and a positive mask representing strong sample response (figure 16). The spectrometer may acquire Raman spectra through another material, such as packaging, a petri dish ...

Methods for implementing standardised time domain diffuse optical spectroscopy in wearables/portables

APPARATUS WITH INTERNAL TOTAL REFLEXION USING STREWN LIGHT.

Method and device for determining at least one property of a test specimen test

Die Erfindung betrifft ein Verfahren zur Ermittlung zumindest einer Prüfeigenschaft eines Prüfgegenstands und eine Messvorrichtung, welche geeignet ist, ein Messfeld (3) unter einer Vielzahl an Anstrahlungskombinationen aus Einstrahlungswinkel (α) und/oder Wellenlängenbereich (λ) mit elektromagnetischer Strahlung (5) anzustrahlen und die Intensität der jeweils von dem Messfeld unter zumindest einem Abstrahlungswinkel (β) remittierten elektromagnetischen Strahlung (5) zu messen. Die Prüfeigenschaft weist zumindest ein definiertes messbares Einzelmerkmal auf, wobei das Einzelmerkmal oder eine definierte Merkmalskombination mehrerer solcher Einzelmerkmale die Herkunft und/oder Identität des Prüfgegenstandes (1) belegt, wobei das Einzelmerkmal oder die Merkmalskombination messbar ist, wenn sie durch die elektromagnetische Strahlung (5) auf eine durch eine Auswahl an Anstrahlungkombinationen definierte Art und Weise optisch angeregt wird. Das Einzelmerkmal oder die Merkmalskombination wird mit ...

SPEKTROMETER

The invention relates to a spectrometer (1) for examining the substances a fluid (2) contains, having a housing (3) with a light source (4) arranged therein and a detector (5) arranged therein, wherein the light from the light source (4) with a specified spectral range (??) is guided through a transmitting window (7) through the fluid (2) to be examined and through a receiving window (8) to the detector (5), wherein the light source (4) is formed by a plurality of light-emitting diodes (10) which are connected to control electronics (11) and are configured for emitting light of different wavelength ranges (??i) within the specified spectral range (??). In order to provide as cost-effective a spectrometer (1) as possible with a small structural size, provision is made for the detector (5) to be configured for receiving the light in the entire specified spectral range (??) and for the control electronics (11) to be configured for sequentially actuating the light-emitting diodes (10), and ...

Collisional broadening compensation using real or near-real time validation in spectroscopic analyzers

Validation verification data quantifying an intensity of light reaching a detector of a spectrometer from a light source of the spectrometer after the light passes through a validation gas across a known path length can be collected or received. The validation gas can include an amount of an analyte compound and an undisturbed background composition that is representative of a sample gas background composition of a sample gas to be analyzed using a spectrometer. The sample gas background composition can include one or more background components. The validation verification data can be compared with stored calibration data for the spectrometer to calculate a concentration adjustment factor, and sample measurement data collected with the spectrometer can be modified using this adjustment factor to compensate for collisional broadening of a spectral peak of the analyte compound by the background components. Related methods, articles of manufacture, systems, and the like are described.

System and method for calibrating imaging measurements taken from aerial vehicles

Systems and methods are provided for calibrating spectral measurements taken of one or more targets from an aerial vehicle. Multiple photo sensors may be configured to obtain spectral measurements of one or more ambient light sources. The obtained spectral measurements of the one or more ambient light sources may be used to calibrate the obtained spectral measurements of the target.

A SPECTROMETRIC APPARATUS FOR MEASURING SHIFTED SPECTRAL DISTRIBUTIONS

This invention relates to a spectroscopic apparatus for measuring at least two spectrally shifted spectral distributions of a light beam, said apparatus comprises a dispersive element adapted to generate a spatial dispersion of the spectral components in a light beam when said dispersive element is being illuminated by said light beam; and a detector adapted to measure the intensity of at least a part of said dispersed spectral components where said apparatus further comprises an optical shifting means adapted to illuminate said dispersive element in at least two different ways, such that said light beam hits said dispersive element differently, and whereby said dispersive element generates at least two spatially shifted spatial dispersions of the spectral components in said light beam. The invention further relates to a probing system comprising said spectroscopic apparatus for measuring at least two spectrally shifted spectral distributions of a light beam, and a method for measuring ...

WIDE BANDWIDTH OPTICAL DETECTOR

Disclosed are the method and system to derive the wavelength/frequency information covering wide wavelength or frequency range. Its practical applications include both fixed wavelength optical signal and wide bandwidth tunable or non-tunable optical signal, where the wavelength/frequency information is necessary for optical signal calibration, control, and monitoring, optical communications, and data processing. The approach has a "self-compensation" feature which is preferred to improve the accuracy of the extracted wavelength or frequency information even though there are components in the system having strong wavelength or frequency dependence in the wide wavelength or frequency range. The method is generic which can be realized in free space, fiber, or photonic integrated circuit (PIC).

SYSTEMS AND METHODS FOR BRILLOUIN SPECTROSCOPY AND IMAGING OF TISSUES

Systems and methods are provided for measuring the mechanical properties of ocular tissue, such as the lens or corneal tissue, for diagnosis as well as treatment monitoring purposes. A laser locking feedback system is provided to achieve frequency accuracy and sensitivity that facilitates operations and diagnosis with great sensitivity and accuracy. Differential comparisons between eye tissue regions of a patient, either on the same eye or a fellow eye, can further facilitate early diagnosis and monitoring.

METHOD AND APPARATUS FOR THE MONITORING AND CONTROL OF COMBUSTION

A sensing apparatus (10) consisting of more than one diode laser (12) having select lasing frequencies, a multiplexer (16) optically coupled to the outputs of the diode lasers with the multiplexer being further optically coupled to a pitch side optical fiber. Multiplexed laser light is transmitted through the pitch side optical fiber to a pitch optic (20) operatively associated with a process chamber (22) which may be a combustion chamber or the boiler of a coal or gas fired power plant. The pitch optic (20) is oriented to project multiplexed laser output through the process chamber. Also operatively oriented with the process chamber is a catch optic (24) in optical communication with the pitch optic to receive the multiplexed laser output projected through the process chamber. The catch optic (24) is optically coupled to an optical fiber which transmits the multiplexed laser output to a demultiplexer (28). The demultiplexer (28) demultiplexes the laser light and optically couples the select ...

COLLISIONAL BROADENING COMPENSATION USING REAL OR NEAR-REAL TIME VALIDATION IN SPECTROSCOPIC ANALYZERS

Validation verification data quantifying an intensity of light reaching a detector of a spectrometer from a light source of the spectrometer after the light passes through a validation gas across a known path length can be collected or received. The validation gas can include an amount of an analyte compound and an undisturbed background composition that is representative of a sample gas background composition of a sample gas to be analyzed using a spectrometer. The sample gas background composition can include one or more background components. The validation verification data can be compared with stored calibration data for the spectrometer to calculate a concentration adjustment factor, and sample measurement data collected with the spectrometer can be modified using this adjustment factor to compensate for collisional broadening of a spectral peak of the analyte compound by the background components. Related methods, articles of manufacture, systems, and the like are described.

SYSTEM AND METHOD FOR CALIBRATING IMAGING MEASUREMENTS TAKEN FROM AERIAL VEHICLES

Systems and methods are provided for calibrating spectral measurements taken of one or more targets from an aerial vehicle. Multiple photo sensors may be configured to obtain spectral measurements of one or more ambient light sources. The obtained spectral measurements of the one or more ambient light sources may be used to calibrate the obtained spectral measurements of the target.

IN-SITU SPECTRAL PROCESS MONITORING

Increasing the precision of process monitoring may be improved if the sensors take the form of travelling probes riding along with the flowing materials in the manufacturing process rather than sample only when the process moves passed the sensors fixed location. The probe includes an outer housing hermetically sealed from the flowing materials, and a light source for transmitting light through a window in the housing onto the flowing materials. A spatially variable optical filter (spf) captures light returning from the flowing materials, and separates the captured light into a spectrum of constituent wavelength signals for transmission to a detector array, which provides a power reading for each constituent wavelength signal.

SYSTEM AND METHOD REDUCING FIBER STRETCH INDUCED TIMING ERRORS IN FIBER OPTIC COUPLED TIME DOMAIN TERAHERTZ SYSTEMS

A system for reducing effects relating to stretching of an optical fiber includes an optical control source, the optical source outputting an optical signal, a terahertz transmitter and receiver both being optically coupled to the optical source, and a means for providing the optical signal to both the terahertz transmitter and terahertz receiver such that the terahertz receiver is synchronized to the terahertz transmitter by the optical signal. The means prevents the stretching of an fiber carrying the optical signal provided to the terahertz transmitter or terahertz receiver or allows for the stretching an optical fiber such that the terahertz receiver will still be synchronized to the terahertz transmitter by the optical signal.

SYSTEM AND METHOD REDUCING FIBER STRETCH INDUCED TIMING ERRORS IN FIBER OPTIC COUPLED TIME DOMAIN TERAHERTZ SYSTEMS

A system for reducing effects relating to stretching of an optical fiber includes an optical control source, the optical source outputting an optical signal, a terahertz transmitter and receiver both being optically coupled to the optical source, and a means for providing the optical signal to both the terahertz transmitter and terahertz receiver such that the terahertz receiver is synchronized to the terahertz transmitter by the optical signal. The means prevents the stretching of an fiber carrying the optical signal provided to the terahertz transmitter or terahertz receiver or allows for the stretching an optical fiber such that the terahertz receiver will still be synchronized to the terahertz transmitter by the optical signal.

MULTI-PASS OPTICAL CELL WITH ACTUATOR FOR ACTUATING A REFLECTIVE SURFACE

A multi-pass optical cell with an actuator for actuating a reflective surface is provided. In one preferred embodiment, an apparatus is provided comprising a first reflective surface, a second reflective surface, and a support structure supporting the first and second reflective surfaces. The support structure positions the first and second reflective surfaces to create an optical cell. The apparatus also comprises a source and a detector, which are positioned such that light emitted from the source is reflected in the optical cell at least one time between the first and second reflective surfaces before reaching the detector. The apparatus further comprises an actuator coupled with and operative to actuate the first reflective surface. In some embodiments, the actuator rotates the first reflective surface. Also, in some embodiments, the multi-pass optical cell is an open path multi-pass optical cell, while, in other embodiments, the multi-pass optical cell is a closed path multi-pass optical ...

SCATTERED TOTAL INTERNAL REFLECTANCE APPARATUS

SCATTERED TOTAL INTERNAL REFLECTANCE APPARATUS A new immunoassay system is provided for the detection of ligands or ligand binding partners in solution in a heterogeneous format. The invention relies upon the detection of back scattered light from an evanescent wave disturbed by the presence of a colloidal gold label brought to the interface by an immunological reaction. The evanescent wave existing at the interface in turn is the result of a totally internally reflected incident light wave. Placement of the detector at a back angle above the critical angle insures a superior signal-to-noise ratio. Apparatus and methods for scanning, detecting and manipulating light including a scattered total internal reflectance immunoassay system are provided. ORD-82 ...

Spectral analysis

Target component calibration device, electronic device, and target component calibration method

CAVITY RING-DOWN SPECTROSCOPY HAVING INTERLEAVED DATA ACQUISITION FOR INTERFERENCE MITIGATION

METHOD FOR MANUFACTURING SPECTRAL MODULE AND SPECTRAL MODULE

In a method for manufacturing a spectral module (1), a light detection unit (10) comprised by making a light detection element (5) adhere to a light transmissible plate (56) is stuck to the front surface (2a) of a substrate (2) by an optical resin agent (63). Since a light transmissible hole (50) of the light detection element (5) is then covered with the light transmissible plate (56), the optical resin agent (63) is prevented from coming into the light transmissible hole (50). Further, when the light detection unit (10) is prepared, the light transmissible hole (50) is made at a semiconductor substrate (91) after sticking the semiconductor substrate (91) on which a light detection unit (5a) is provided to the light transmissible plate (56), so that what may cause the occurrence of refraction, scatter and the like is surely prevented from coming into the light transmissible hole (50).

SPECTROSCOPE AND METHOD OF PERFORMING SPECTROSCOPY

A spectroscope designed to utilize an adaptive optical element such as a micro mirror array (MMA) and two distinct light channels and detectors. The devices can provide for real-time and near real-time scaling and normalization of signals.

IMPROVED METHOD FOR BIOMOLECULAR DETECTION AND SYSTEM THEREOF

A method of sensing at least one target on a receptor having a substrate and a translucent coating includes minimizing interference fringe patterns in an image of the target. The method also includes passing the image of the target through an imaging system intermediate the receptor and a detector.

NON-CONTACT MEDIA DETECTION SYSTEM USING REFLECTION/ABSORPTION SPECTROSCOPY

The innovation uses the response of media to electromagnetic (EM) signals in order to identify them. When EM sources are directed at a target medium, a response is obtained from an EM detector observing the event. By comparing a measured response to a library of known profiles, one or more likely candidates for the target medium can be determined.

METHOD FOR ADJUSTING SPECTRAL MEASUREMENTS TO PRODUCE A STANDARD RAMAN SPECTRUM

A method for producing a standard Raman spectrum of a sample (26). A source (12) or incident radiation (14). The incident beam (22) and a monitor beam (24) from the incident radiation (14). The incident beam (22) is directed to the sample (26) and a Raman beam (32) is generated from the sample (26). Spectral data may be collected directly from the monitor beam (24) and the Raman beam simultaneously. The occurrence of a frequency shift in the incident radiation (14) is determined. One spectral measurement is made after the incident radiation (14) is determined. One spectral measurement is made after the occurrence of the frequency shift, or a first spectral measurement is made before and a second spectral measurement is made after the frequency shift. One or more arithmetic calculations are applied to the single spectral measurement, or the second spectral measurement is subtracted from the first spectral measurement. One or more integral transforms are applied to the resulting spectral ...

Spectrometer for color spectrally-encoded endoscopy

A grating element has an interface configured to cause light beams, include N visible color lights, incident to the interface to diffract at different orders. An imaging lens is configured to focus the N visible color lights diffracted by the grating element. A sensor is configured to receive and detect the focused N visible color lights. The focused N visible color lights include at least a first color light and a second color light. The first color light is diffracted in a first diffraction order and corresponds to a first wavelength resolution for the first color light. The second color light is diffracted in a second diffraction order and corresponds to a second wavelength resolution for the second color light. The first diffraction order is higher than the second diffraction order and the first wavelength resolution is smaller than the second wavelength resolution.

Method Of Calibrating Spectroscopic Apparatus And Method Of Producing Calibrated Spectroscopic Apparatus

Spectral apparatus includes sensors that output signals indicating the respective energy amounts of a plurality of wavelength components. For each of the sensors, its reference spectral sensitivity is acquired, and an indicator indicating the reference spectral sensitivity of the sensor, is acquired. The deviation of an indicator indicating the spectral sensitivity of the sensor from the indicator indicating the reference spectral sensitivity of the sensor, is expressed by a linear function of an indicator indicating a mechanical error in the spectral apparatus. The indicator indicating the mechanical error in the spectral apparatus, is acquired to adapt a spectral sensitivity set of sensors to a signal set output by the sensors. For each of the sensors, the deviation of the indicator indicating the spectral sensitivity of the sensor from the indicator indicating the reference spectral sensitivity of the sensor, is acquired, so that the spectral sensitivity of the sensor is acquired. 1. A method of calibrating a spectral apparatus , the method comprising:a step a) of causing the spectral apparatus to be calibrated, the spectral apparatus including: an optical system that converts light to be measured into a spectrum; and a light-receiving sensor including a plurality of sensors that outputs a plurality of signals, the plurality of sensors including sensors that outputs signals indicating respective energy amounts of a plurality of wavelength components included in the spectrum;a step b) of acquiring, for each of the plurality of sensors, reference spectral sensitivity of the sensor;a step c) of acquiring, for each of the plurality of sensors, an indicator indicating the reference spectral sensitivity of the sensor acquired at the step b);a step d) of creating, for each of the plurality of sensors, a model in which a linear function of an indicator indicating a mechanical error in the spectral apparatus, expresses deviation of an indicator indicating spectral ...

Apparatuses and methods for bio-sensing using unmanned aerial vehicles

Described herein are methods, apparatuses, and systems that enable a light weight autonomous unmanned aerial vehicle (UAV) to process hyperspectral (HSI) data during its flight and send information to the ground computer via radio-link. This capability is not currently available owing to the severe combination of technical constraints: the typical processing power required to analyze HSI data in real time; the small space and power available for the payload in a light-weight UAV; and the limited bandwidth available on the wireless link.

Method And Device For Measuring The Concentration Of Substances In Gaseous Or Fluid Media Through Optical Spectroscopy Using Broadband Light Sources

The invention relates to a method and to a device for using partially non-stabilized broadband light sources to accurately measure partially broadband-absorbing substances using referencing measuring cells. In order to create a low-cost, high-resolution, and at the same time fast spectrographic device for measuring concentrations of substances in fluid or gaseous media that is also suitable for harsh environments, the light radiated by the broadband light sources ( 1 ) through light guiding optical systems is fed through the measuring section of the self-referencing measuring cell ( 20, 30, 40 ) or only partially through a measuring cell ( 10 ) to a measurement detector (photoreceptor 11 ) and partially through a reference path (optical waveguide 8 ) to a reference detector (photoreceptor 15 ), and a mode coupler ( 5, 9, 14 ) is associated with each optical waveguide ( 2, 4, 7, 8 ) in order to homogenize the radiation characteristic of the broadband light sources ( 1 ), which varies over time and space.

Method and apparatus for measuring a spectrum of an optical sensor, advantageously in the infrared region

A method for measuring a spectrum of an optical sensor, advantageously in the infrared region, in which a light beam impinges on an optical sensor in contact with a medium to be measured, wherein the optical sensor transmits a measurement beam changed by the medium to be measured and the measurement beam is fed to a pyrodetector, which issues output signals corresponding to the spectrum. The intensity of the measurement signal is modulated before impinging on a pyrodetector. In order to provide a cost effective, vibration free measuring apparatus, which has a long lifetime, intensity modulation of measurement beam occurs by tuning-in wavelengths contained in the optical spectrum of measuring beam.

System and method reducing fiber stretch induced timing errors in fiber optic coupled time domain terahertz systems

A system for reducing effects relating to stretching of an optical fiber includes an optical control source, the optical source outputting an optical signal, a terahertz transmitter and receiver both being optically coupled to the optical source, and a means for providing the optical signal to both the terahertz transmitter and terahertz receiver such that the terahertz receiver is synchronized to the terahertz transmitter by the optical signal. The means prevents the stretching of an fiber carrying the optical signal provided to the terahertz transmitter or terahertz receiver or allows for the stretching an optical fiber such that the terahertz receiver will still be synchronized to the terahertz transmitter by the optical signal.

Apparatus and method for measuring color

Color measuring systems and methods are disclosed. Perimeter receiver fiber optics are spaced apart from a central source fiber optic and receive light reflected from the surface of the object being measured. Light from the perimeter fiber optics pass to a variety of filters. The system utilizes the perimeter receiver fiber optics to determine information regarding the height and angle of the probe with respect to the object being measured. Under processor control, the color measurement may be made at a predetermined height and angle. Various color spectral photometer arrangements are disclosed. Translucency, fluorescence and/or surface texture data also may be obtained. Audio feedback may be provided to guide operator use of the system. The probe may have a removable or shielded tip for contamination prevention.

System and Method for Correcting Spectral Response Using a Radiometric Correction Filter

The present disclosure provides for a correction filter that may be configured to comprise a predetermined arrangement of thin film layers. This arrangement of thin film layers may be such that it effectively enables a correction filter to generate a predetermined spectral response, wherein said predetermined spectral response is substantially the same as a determined instrument response correction associated with an instrument. The invention of the present disclosure therefore provides for effectively compensating for transmission inefficiencies associated with an instrument without the need for separate reference measurements to determine and correct for instrument response.

Spectrometer

A spectrometer includes a light source section that includes a plurality of LEDs having different emission wavelengths, a variable wavelength interference filter that selectively extracts light of a predetermined wavelength, a detector that detects the amount of light, and a control circuit section. The control circuit section includes a mode switching section that switches a calibration mode and a measurement mode, an outside light analysis section that analyzes characteristics of outside light in the calibration mode, a reference light setting section that set the amount of light emitted from each of the LEDs on the basis of the characteristics of the outside light, and a light source driving section that drives each of the LEDs on the basis of the amount of light emitted which is set in the measurement mode.

METHOD FOR MEASURING THE URANIUM CONCENTRATION OF AN AQUEOUS SOLUTION BY SPECTROPHOTOMETRY

A method for measuring the uranium concentration of an aqueous solution including the following successive steps: a) electrochemical reduction towards valence IV, of the uranium present in the aqueous solution with a valence greater than IV, this reduction being implemented at pH<2 and by passing an electrical current in the solution; b) measurement of the absorbance of the solution obtained on completion of step a) at a chosen wavelength between 640 and 660 nm, and preferably 652 nm; and c) determination of the uranium concentration of the aqueous solution by deduction of the uranium concentration of valence (IV) present in the aqueous solution obtained on completion of step a) from measurement of the absorbance obtained in step b). 1. A method for measuring uranium concentration of an aqueous solution comprising:a) providing an aqueous solution which contains uranium of a valence greater than valence IV;b) implementing an electrochemical reduction towards valence IV, of the uranium of a valence greater than valence IV present in the aqueous solution, this reduction being implemented at pH<2 and bypassing an electrical current in the solution;c) measuring the absorbance of the solution obtained on completion of step b) at a chosen wavelength comprised between 640 and 660 nm; andd determining the uranium concentration of the aqueous solution by deduction of the uranium concentration of valence IV present in the aqueous solution obtained on completion of step b) from measurement of the absorbance obtained in step c).2. The method according to claim 1 , wherein step b) comprises the following operations:distribution of the pH<2 solution in a first and second compartment of an electrochemical cell, where each compartment including an electrode intended to be in contact with the solution contained in this compartment, and the first and second compartments being separated from one another by a means allowing only electrons to pass from one compartment to the other; ...

Image capturing device, color measuring device, color measuring system, image forming apparatus, and color measuring method

An image capturing device includes a sensor unit that captures a predetermined range including a subject; a reference chart that is captured by the sensor unit together with the subject; an illumination light source that illuminates the subject and the reference chart; a lens member including one or more lenses arranged in an optical path of reflected light extending from the subject and the reference chart to the sensor unit; and a lens moving unit that moves at least one lens of the lens member so as to change a position thereof in a direction along the optical path.

Spectrometer Apparatus and a Corresponding Method for Operating a Spectrometer Apparatus

A spectrometer apparatus is disclosed that includes at least one light source for irradiating a sample with light, an optical detection device for detecting light scattered by the sample, at least one optical filter device, which is arranged in front of and/or behind the sample, a contact sensor device for determining a contact between the sample and the spectrometer apparatus and for outputting a corresponding output signal, a control device for controlling the light source and the detection device in response to the output signal. The control device is designed such that the control device modifies at least one operating parameter of the light source and the detection device, when the output signal indicates the contact between the sample and the spectrometer apparatus. A method for operating a spectrometer apparatus is disclosed as well. 1. A spectrometer apparatus comprising:at least one light source configured to irradiate a sample with light;an optical detection device configured to detect the light scattered by the sample;at least one optical filter device arranged in front of and/or behind the sample,a contact sensor device configured to determine a contact between the sample and the spectrometer apparatus and to output a corresponding output signal;a control device to control the light source and the detection device in response to the output signal;wherein the control device is designed such that it changes at least one operating parameter of the light source and of the detection device if the output signal indicates the contact between the sample and the spectrometer apparatus.2. The spectrometer apparatus as claimed in claim 1 , wherein the control device is designed such that the detection of the spectrum is activated only in the case where contact between the spectrometer apparatus and the sample is present.3. The spectrometer apparatus as claimed in claim 1 , wherein the control device is designed such that the detection of the spectrum is activated ...

Infrared Imaging System with Automatic Referencing

A method and apparatus for obtaining reference samples during the generation of a mid-infrared (MW) image without requiring that the sample being imaged be removed is disclosed. A tunable MIR laser generates a light beam that is focused onto a specimen on a specimen stage that moves the specimen in a first direction. An optical assembly includes a scanning assembly having a focusing lens and a mirror that moves in a second direction, different from the first direction, relative to the stage such that the focusing lens maintains a fixed distance between the focusing lens and the specimen stage. A light detector measures an intensity of light leaving the point on the specimen. A controller forms an image from the measured intensity. A reference stage is positioned such that the mirror moves over the reference stage in response to a command so that the controller can also make a reference measurement. 1. An apparatus comprising:a tunable mid-infrared (MIR) laser that generates a light beam;a specimen stage adapted to carry a specimen to be scanned, said stage moving said specimen in a first direction;an optical assembly that focuses said light beam to a point on said specimen, said optical assembly comprises a scanning assembly having a focusing lens that focuses said light beam to a point on said specimen and a mirror that moves in a second direction relative to said stage such that said focusing lens maintains a fixed distance between said focusing lens and said specimen stage, said first direction being different from said second direction.a first light detector that measures a first intensity of light leaving said point on said specimen;a controller that forms a MIR image from said first intensity of light; anda reference stage positioned such that said mirror moves over said reference stage in response to a command from said controller.2. The apparatus of wherein said first direction is substantially orthogonal to second direction.3. The apparatus of wherein said ...

Patterning aperture slit for spectrometry

A device for improving the removal of stray light interference in a spectrometer using an aperture slit with a predefined grid pattern incorporated into it to create periodic shadowing allowing the identification of the desired signal and removal of stray light is disclosed.

DYNAMIC CALIBRATION METHOD FOR ECHELLE SPECTROMETER IN LASER-INDUCED BREAKDOWN SPECTROSCOPY

The present invention belongs to the technical field of elemental analysis, and more particularly, relates to a dynamic calibration method for echelle spectrometer in laser-induced breakdown spectroscopy, comprising: S1: collecting a standard light source by using an echelle spectrometer; S2: in combination with a calibration function, calculating a pixel position coordinate ({circumflex over (x)}, ŷ) corresponding to a spectral wavelength ŵ; S3: performing dynamic searching and filtering near the pixel position coordinate ({circumflex over (x)}, ŷ) to obtain a set D of all pixel position coordinates, and adjusting all original intensity values in the set D to obtain intensity values F(I), and S4: calculating a spectral line intensity value after dynamic calibration by summing the adjusted intensity values F(I), thereby completing dynamic calibration of the result of the echelle spectrometer. The method in the present invention can overcome the shortcoming, i.e., the existing echelle spectrometer is only calibrated before measurement without solving the spectral line drift during use, increasing the absolute intensity of the wavelength and reducing the detection limit of the quantitative analysis, as well as improving the precision of the quantitative analysis of an element to be analyzed. 1. A dynamic calibration method for echelle spectrometer in laser-induced breakdown spectroscopy , comprising:S1: by using an echelle spectrometer, collecting a spectrogram of a standard calibration light source, and getting spectral wavelengths in different orders according to the spectrogram;S2: based on information about the spectral wavelengths in different orders obtained in the step S1, and in combination with a corresponding calibration function f({circumflex over (x)},ŷ), calculating a pixel position coordinate ({circumflex over (x)},ŷ) corresponding to a spectral wavelength ŵ of a certain analysis element,where x and y respectively represent original pixel horizontal and ...

System and method for improving calibration transfer between multiple raman analyzer installations

A method for harmonizing the responses of a plurality of Raman analyzers includes steps of calibrating an intensity axis response of a spectrometer to a reference light source and measuring a laser wavelength of a laser using the spectrometer. The method also includes steps of measuring a fluorescence spectrum induced by the laser at the laser wavelength of a plurality of standard reference material samples using the spectrometer, measuring a temperature of each standard reference material sample while measuring the fluorescence spectrum, and correcting the fluorescence spectrum of each standard reference material sample based on the respective temperature. The method further includes steps of deploying each standard reference material sample in one of a plurality of field calibrator devices and calibrating the intensity axis of one of the Raman analyzers using one of the field calibrator devices and the corrected fluorescence spectrum of the respective standard reference material sample.

Absolute measurement method and apparatus thereof for non-linear error

The present invention discloses a method for measuring absolute value of non-linear error and an apparatus thereof. The method comprises: placing N reflecting plates jointed together at the sample port of the optical measuring instrument at the same time, wherein each of reflecting plate has a same covering area at the sample port; placing an aperture along light paths of the optical measuring instrument; adjusting the number of reflecting plates as used according to a position in the measuring range of the optical measuring instrument where the non-linear error is required to be measured; following every adjustment, acquiring the output results when the adjusted reflecting plates are placed at the sample port; performing a computation processing for non-linear error to the output results; and acquiring the non-linear error of the output results of the optical measuring instrument. 1. An absolute measurement method for non-linear error , comprising:placing N reflecting plates jointed together at a sample port of an optical measuring instrument at the same time, wherein each of reflecting plates has a same covering area at the sample port and N is a natural number more than or equal to 2;placing an aperture along light paths of the optical measuring instrument;forming N optical regions corresponding to N reflecting plates at the sample port, wherein none of the N optical regions cover the edges of the reflecting plates;adjusting the number of the reflecting plates as used according to a position in the measuring range of the optical measuring instrument where the non-linear error is required to be measured;acquiring the output results of the optical measuring instrument when the adjusted reflecting plates are placed at the sample port following every adjustment;performing a computation processing for non-linear error to the output results; andacquiring the non-linear error of the output results of the optical measuring instrument.2. The method according to claim 1 , ...

SYSTEM AND METHOD FOR CALIBRATING IMAGING MEASUREMENTS TAKEN FROM AERIAL VEHICLES

Systems and methods are provided for calibrating spectral measurements taken of one or more targets from an aerial vehicle. Multiple photo sensors may be configured to obtain spectral measurements of one or more ambient light sources. The obtained spectral measurements of the one or more ambient light sources may be used to calibrate the obtained spectral measurements of the target. 1. A system configured to be disposed on an aerial vehicle to obtain images of an agricultural land area target at different spectral bands that are calibrated for ambient lighting conditions , the system comprising:four imaging devices consisting of a first imaging device, a second imaging device, a third imaging device, and a fourth imaging device, wherein:the first imaging device is configured to obtain first image data of the target that correspond to a first discrete spectral frequency range centered on a first spectral frequency;the second imaging device is configured to obtain second image data of the target that correspond to a second discrete spectral frequency range centered on a second spectral frequency;the third imaging device is configured to obtain third image data of the target that correspond to a third discrete spectral frequency range centered on a third spectral frequency;the fourth imaging device is configured to obtain fourth image data of the target that correspond to a fourth discrete spectral frequency range centered on a fourth spectral frequency; andthe first spectral frequency, the second spectral frequency, the third spectral frequency, and the fourth spectral frequency are each different from each other;and a photo sensor apparatus disposed near the four imaging devices, the photo sensor apparatus being configured to measure ambient lighting conditions at each of the first discrete spectral frequency range, the second discrete spectral frequency range, the third discrete spectral frequency range, and the fourth discrete spectral frequency range;wherein ...

MULTI-ANGLE SPECTRAL IMAGING MEASUREMENT METHOD AND APPARATUS

A lighting device that emits illumination light from two or more angular directions onto a sample surface to be measured, an imaging optical lens, and a monochrome two-dimensional image sensor are provided. This configuration provides a method and an apparatus that take a two-dimensional image of the sample surface to be measured at each measurement wavelength and accurately measure multi-angle and spectral information on each of all pixels in the two-dimensional image in a short time. In particular, a multi-angle spectral imaging measurement method and apparatus that have improved accuracy and usefulness are provided. 1. A multi-angle spectral imaging measurement apparatus comprising:a linear or spot lighting device capable of emitting white illumination light perpendicularly onto a sample surface containing effect materials from two or more fixed angular directions;spectroscopic means for dispersing light reflected from the sample surface, the spectroscopic means being disposed above the sample surface;an imaging lens forming an image of reflected light dispersed by the spectroscopic means;a fixed two-dimensional image sensor capable of receiving the reflected light through the imaging lens to take an image of the sample surface; anda white reference surface provided around the entire sample surface;the multi-angle spectral imaging measurement apparatus acquiring spectral information on the sample surface by using changes in optical geometrical conditions in an illumination direction and an image taking direction for each pixel in a two-dimensional image taken with the two-dimensional image sensor;wherein, during calibration before measurement, an image of a reference standard white plate and the white reference surface is taken at the same time, a calibration coefficient for each pixel and each wavelength is measured, and exposure time for each of the wavelengths is determined;a two-dimensional image of the sample surface and the white reference surface provided ...

COLLISIONAL BROADENING COMPENSATION USING REAL OR NEAR-REAL TIME VALIDATION IN SPECTROSCOPIC ANALYZERS

Validation verification data quantifying an intensity of light reaching a detector of a spectrometer from a light source of the spectrometer after the light passes through a validation gas across a known path length can be collected or received. The validation gas can include an amount of an analyte compound and an undisturbed background composition that is representative of a sample gas background composition of a sample gas to be analyzed using a spectrometer. The sample gas background composition can include one or more background components. The validation verification data can be compared with stored calibration data for the spectrometer to calculate a concentration adjustment factor, and sample measurement data collected with the spectrometer can be modified using this adjustment factor to compensate for collisional broadening of a spectral peak of the analyte compound by the background components. Related methods, articles of manufacture, systems, and the like are described. 1. A method comprising:receiving validation verification data quantifying an intensity of light reaching a detector of a spectrometer from a light source of the spectrometer after the light passes through a validation gas across a known path length, the validation gas comprising a known amount of an analyte compound and an undisturbed background composition that is representative of a sample gas background composition of a sample gas to be analyzed using a spectrometer, the sample gas background composition comprising one or more background components other than the analyte compound;comparing the validation verification data with stored calibration data for the spectrometer to calculate a concentration adjustment factor; andmodifying, using the concentration adjustment factor, sample measurement data collected with the spectrometer to compensate for collisional broadening of a spectral peak of the analyte compound by the background components in the sample gas.2. A method as in claim 1 , ...

RADIATION MEASURING SYSTEMS AND METHODS THEREOF

A radiation measuring device for measuring electromagnetic radiation originating from an external source. The radiation measuring device includes, a spectrometer, a pyranometer, a pyrgeometer, a diffuser, and a control unit. The spectrometer and a pyranometer are positioned in a sensor zone of a housing of the radiation measuring device. The spectrometer measures visible shortwave radiation and near-infrared shortwave radiation received at the sensor zone. The pyranometer measures shortwave radiation received at the sensor zone. The pyrgeometer is positioned in another sensor zone of the housing and measures longwave radiation received at the other sensor zone. The control unit receives radiation measurements from the spectrometer, pyranometer, and pyrgeometer. A corrected amount of radiation received at the sensor zones of the radiation measuring device is determined from the received radiation measurements. Other embodiments are described and claimed. 1. A radiation measuring device , comprising:a housing having a first sensor zone and a second sensor zone;a spectrometer positioned in the first sensor zone, the spectrometer configured to measure visible shortwave radiation and near-infrared shortwave radiation received at the first sensor zone;a pyranometer positioned in the first sensor zone, the pyranometer configured to measure shortwave radiation received at the first sensor zone;a pyrgeometer positioned in the second sensor zone, the pyrgeometer configured to measure longwave radiation received at the second sensor zone;a diffuser positioned in the first sensor zone covering the spectrometer and the pyranometer, the diffuser configured to scatter the visible shortwave radiation and the near-infrared shortwave radiation received at the first sensor zone; anda control unit electrically coupled to the spectrometer, the pyranometer, and the pyrgeometer, the control unit configured to receive measurements from the spectrometer, the pyranometer, and the pyrgeometer ...

Accessories for handheld spectrometer

A protective sheath having a closed end and an open end is sized to receive a hand held spectrometer. The spectrometer can be placed in the sheath to calibrate the spectrometer and to measure samples. In a calibration orientation, an optical head of the spectrometer can be oriented toward the closed end of the sheath where a calibration material is located. In a measurement orientation, the optical head of the spectrometer can be oriented toward the open end of the sheath in order to measure a sample. To change the orientation, the spectrometer can be removed from the sheath container and placed in the sheath container with the calibration orientation or the measurement orientation. Accessory container covers can be provided and placed on the open end of the sheath with samples placed therein in order to provide improved measurements.

APPARATUS AND METHODS FOR CALIBRATING OPTICAL MEASUREMENTS

Apparatus and methods are described for calibrating an optical system that is used for measuring optical properties of a portion of a subjects body. During a calibration stage, a front surface of a calibration object () is illuminated, light reflected from a plurality of points on the calibration object () is detected, and intensities of the light reflected from the plurality of points on the calibration object () are measured. During a measurement stage, the portion of the subjects body is illuminated, and light reflected from the portion of the subjects body is detected. Measurements performed upon the light that was reflected from the portion of the subjects body are calibrated, using the measured intensities of the light reflected from the plurality of points on the calibration object (). Other applications are also described. 1. A method for calibration of an optical system used for measuring optical properties of a portion of a body of a subject , the method comprising: illuminating a front surface of a calibration object having known reflectance characteristics with light from a light source of the optical system, the front surface being at least partially curved;', 'detecting light reflected from a plurality of points on the calibration object, using at least one detector of the optical system;', 'measuring intensities of the light reflected from the plurality of points on the calibration object; and', 'determining a calibration value at each location upon the calibration object by calculating an integral over all angles with the known reflectance of the calibration object to determine the absolute reflection coefficient; and, "during a calibration stage, deriving information regarding characteristics of the optical system, with reference to which the measurements that are performed upon the portion of the subject's body may be calibrated, by:"} ["illuminating the portion of the subject's body with light from the light source;", "detecting light reflected ...

SPECTROSCOPIC ANALYSIS

A method and analyser for identifying or verifying or otherwise characterising a sample comprising: using or having an electromagnetic radiation source for emitting electromagnetic radiation in at least one beam at a sample, the electromagnetic radiation comprising at least two different wavelengths, using or having a sample detector that detects affected electromagnetic radiation resulting from the emitted electromagnetic radiation affected by the sample and provides output representing the detected affected radiation, and using or having a processor for determining sample coefficients from the output, and identifying or verifying or otherwise characterising the sample using the sample coefficients and training coefficients determined from training samples, wherein the coefficients reduce sensitivity to a sample retainer variation and/or are independent of concentration. 2. An analyser according to wherein prior to determining the training coefficients the desired spectral components are extracted by the processor from the intensity at each of the at least two wavelengths to eliminate the dark current.3. An analyser according to wherein the processor extracts the desired spectral component by multiplying the output representing the detected affected modulated electromagnetic radiation by sine and cosine functions and integrating over the period of modulation oscillation to remove the dark current component.4. An analyser according to wherein the processor extracts the desired spectral component by conducting a Fourier Transform on the output representing the modulated detected affected radiation and removing the dark current component from the transformed output.5. An analyser for identifying or verifying a sample comprising: 'the source is broadband source with multiple filters at different wavelengths that can be arranged in between the broadband source and the sample. The output from each filter provides an electromagnetic beam with one of the selected ...

Analyte system and method for determining hemoglobin parameters in whole blood

A light-emitting module for use in a system for measuring whole-blood hemoglobin parameters or whole-blood bilirubin parameters. The light-emitting module includes an LED light source capable of emitting light wherein the light is directed thereby defining an optical path and a plurality of optical components. The plurality of optical components includes a collimating lens, a first optical diffuser, a circular polarizer, and a focusing lens wherein the plurality of optical components is disposed within the optical path of the light from the LED light source 1. A light-emitting module for use in a system for measuring whole-blood hemoglobin parameters or whole-blood bilirubin parameters , the light-emitting module comprising:an LED light source capable of emitting light wherein the light is directed thereby defining an optical path; and a collimating lens;', 'a first optical diffuser;', 'a circular polarizer; and', 'a focusing lens wherein the plurality of optical components is disposed within the optical path of the light from the LED light source., 'a plurality of optical components comprising2. The light-emitting module of further comprising a protective window disposed downstream of the plurality of optical components.3. The light-emitting module of further includes a light-emitting module substrate that contains an electrical circuit and a light-emitting optics assembly.4. The light-emitting module of wherein the light-emitting optics assembly has an optics assembly housing with an optics assembly end wherein the optics assembly housing supports the plurality of optical components.5. The light-emitting module of wherein the circular polarizer is downstream from the first optical diffuser.6. The light-emitting module of wherein the focusing lens is downstream from the circular polarizer. The present invention relates generally to spectroscopic systems and methods for the identification and characterization of hemoglobin parameters in blood.An ultraviolet-visible ...

Analyte system and method for determining hemoglobin parameters in whole blood

A calibrating-light module for use in a system for measuring whole-blood hemoglobin parameters or whole-blood bilirubin parameters. The calibrating-light module includes a calibrating module housing, a light beam receiving portion connected to a first end of the calibrating module housing, a calibrating light portion connected to a side of the calibrating module housing wherein the side is transverse to the first end, and an optic fiber portion connected to a second end of the calibrating module housing wherein the calibrating module housing, the light beam receiving portion and the optic fiber portion are aligned with an optical path and the calibrating light portion is spaced from and transverse to the optical path. 1. A calibrating-light module for use in a system for measuring whole-blood hemoglobin parameters or whole-blood bilirubin parameters , the calibrating-light module comprising:a calibrating module housing;a light beam receiving portion connected to a first end of the calibrating module housing;a calibrating light portion connected to a side of the calibrating module housing wherein the side is transverse to the first end; andan optic fiber portion connected to a second end of the calibrating module housing wherein the calibrating module housing, the light beam receiving portion and the optic fiber portion are aligned with an optical path and the calibrating light portion is spaced from and transverse to the optical path.2. The calibrating-light module of wherein the calibrating module housing includes a first tubular conduit extending from the first end to the second end.3. The calibrating-light module of wherein the first end has a light beam input opening and the second end has a light beam exit opening.4. The calibrating-light module of wherein the calibrating module housing has a second tubular conduit that is transverse to and intersects with the first tubular conduit.5. The calibrating-light module of wherein the calibrating light portion has a ...

Analyte system and method for determining hemoglobin parameters in whole blood

An optical component group for use in a spectrometer module of a system for measuring whole-blood hemoglobin parameters or whole-blood bilirubin parameters. The optical component group includes a light dispersing element and an achromatic lens assembly disposed between the light dispersing element and a light entrance port of the spectrometer module where the achromatic lens assembly is thermo-compensating permitting thermal expansion and contraction of the achromatic lens assembly in a linear direction where the linear directions is also transverse to a light beam from the light entrance port through the achromatic lens assembly and to the light dispersing element and back through the achromatic lens assembly. 1. An optical component group for use in a spectrometer module of a system for measuring whole-blood hemoglobin parameters or whole-blood bilirubin parameters , the optical component group comprising:a light dispersing element; andan achromatic lens assembly disposed between the light dispersing element and a light entrance port of the spectrometer module and wherein the achromatic lens assembly is thermo-compensating permitting thermal expansion and contraction of the achromatic lens assembly in a linear direction wherein the linear directions is also transverse to a light beam from the light entrance port through the achromatic lens assembly and to the light dispersing element and back through the achromatic lens assembly.2. The group of wherein the achromatic lens assembly includes a lens mount having a fixed mount end fixedly connected to one of a spectrometer base or a baseplate and an unfixed mount end that permits thermal expansion and contraction of the lens mount in a linear direction toward or away from the fixed mount end.3. The group of wherein the achromatic lens assembly includes an achromatic lens fixedly attached to the lens mount.4. The group of wherein the achromatic lens is a spherical achromatic lens.5. The group of wherein the unfixed ...

TRANSFER OF A CALIBRATION MODEL USING A SPARSE TRANSFER SET

A device may obtain a master calibration set, associated with a master calibration model of a master instrument, that includes spectra, associated with a set of samples, generated by the master instrument. The device may identify a selected set of master calibrants based on the master calibration set. The device may obtain a selected set of target calibrants that includes spectra, associated with the subset of the set of samples, generated by the target instrument. The device may create a transfer set based on the selected set of master calibrants and the selected set of target calibrants. The device may create a target calibration set, corresponding to the master calibration set, based on the transfer set. The device may generate, using an optimization technique associated with the transfer set and a support vector regression modeling technique, a transferred calibration model, for the target instrument, based on the target calibration set. 120.-. (canceled)21. A method comprising:creating, by a device, a transfer set based on a selected set of master calibrants and a selected set of target calibrants;creating, by the device, a target calibration set based on the transfer set;generating, by the device, a transferred calibration model based on the target calibration set; andproviding, by the device, the transferred calibration model to a target instrument.22. The method of claim 21 , where the target set includes spectra corresponding to samples associated with both the selected set of master calibrants and the selected set of target calibrants.23. The method of claim 21 , where the target calibration set includes a set of spectra associated with the target instrument.24. The method of claim 21 , where the transferred calibration model includes a model to be used to calibrate measurements obtained by the target instrument.25. The method of claim 21 , where generating the transferred calibration model comprises:applying a support vector regression (SVR) modeling ...

APPARATUS AND METHOD FOR TESTING MATERIALS

An apparatus and method for testing material to determine if the materials have exceeding their useable life based an analysis of the chemical degradation of the material. An infrared (IR) spectroscopic measurement is made of the material. The measurement results are compared to a database of previously obtained measurement results. Depending on the comparison of the measurement result to the database of previously obtained measurement results, an indication of a measure of the lifespan of the chemically reactive material is determined and provided. 1. A method of obtaining an indication of the lifespan of a prepreg material comprising:measuring with an infrared (IR) spectroscopic instrument the prepreg material and generating a result of the measurement;comparing the measurement result to a database of previously obtained measurement results of prepreg materials; anddepending on the comparison of the measurement result to the database of previously obtained measurement results, determining and providing an indication of a lifespan of the prepreg material.2. The method according to claim 1 , wherein the infrared spectroscopic instrument includes a hand-held IR spectrometer3. The method according to claim 1 , wherein the prepreg material has an indicated use by date and the use by date is in the past when the measurement is made with the IR spectroscopic instrument.4. The method according to further comprising indicating the lifespan of the material according to two or more categories.5. The method according to claim 4 , wherein the categories include “not acceptable” claim 4 , “just acceptable” claim 4 , and “acceptable”.6. A method of calibrating an infrared spectrometer comprising:storing a plurality of samples of a chemically reactive material in a plurality of different conditions;testing each sample of chemically reactive material at specified intervals, the testing comprising taking an infrared spectroscopic measurement of the material and testing physical and ...

METHOD AND APPARATUS FOR TESTING MATERIALS

A method and apparatus for testing materials for testing materials using infrared spectrometry. Calibration of an infrared spectrometer for use in testing materials including the steps of: selecting variables which have the potential to influence the physical characteristics of a composite used in the aerospace industry, selecting values for each variable and inputting the variable and values into a design of experiments model, thereby obtaining a sample test matrix. 1. A method of testing an aircraft or aircraft component comprising composite material , the method comprising: selecting a plurality of values for each variable;', 'inputting the variables and values into a design of experiments model, thereby obtaining a sample test matrix;', 'testing a plurality of composite samples according to the test matrix, thereby obtaining a number of infrared spectra;', 'testing a physical characteristic of the composite samples;', 'collating the infrared spectra detected by the infrared spectrometer with the measured physical characteristic of a sample, wherein the correlation of infrared spectra and measured physical characteristics forms a database of measurement results;, 'calibrating an infrared spectrometer by selecting a plurality of variables which have the potential to influence the physical characteristics of a composite used in the aerospace industry, the calibration further comprisesthe method further comprising:taking a measurement of the aircraft or aircraft component comprising composite material using the infrared spectrometer, thereby obtaining an infrared spectrum,comparing the infrared spectrum to the database of infrared spectra and correlated physical characteristics;thereby providing a value relating to a measurement of a physical characteristic of the composite material.2. The method as claimed in claim 1 , comprising calibrating an infrared spectrometer for testing composite materials in the aerospace industry for thermal effects.3. The method as ...

PHOTODETECTOR OUTPUT CORRECTION METHOD USED FOR SPECTROSCOPIC ANALYZER

The present invention is adapted to make light beams emitted from a light source enter a photodetector both when interposing an optical element having known characteristics and when not interposing the optical element, and acquire a first output value and a second output value that are the output values of the photodetector with respect to each of light beams that respectively have predetermined multiple wavenumbers and are included in the incident light beams, and obtain an arithmetic expression for calculating intensity of incident light beams from an output value of the photodetector, using parameters that are a ratio between the first output value and the second output value at each of the predetermined wavenumbers and the wavenumber transmission or reflection characteristic of the optical element. 1. A photodetector output correction method used for a spectroscopic analyzer or a spectroscope comprising: a light source , a spectroscopic part that disperses light beams emitted from the light source , and a photodetector for measuring intensity of light beams exiting from the spectroscopic part , wherein the photodetector is adapted such that a relationship between incident light intensity and an output value is substantially linear within a predetermined range , the photodetector output correction method comprising:making the light beams emitted from the light source enter the photodetector interposing an optical element having a known wavenumber transmission characteristic or a known wavenumber reflection characteristic so as to make intensity of the light beams fall within the range, and acquiring a first output value as an output value of the photodetector with respect to each of light beams that have predetermined multiple wavenumbers and are included in the incident light beams;making the light beams emitted from the light source enter the photodetector without interposing the optical element, and acquiring a second output value as an output value of the ...

QUANTITATIVE ELEMENTAL PROFILING IN OPTICAL EMISSION SPECTROSCOPY

The current invention considers the spectrum as a multimodal distribution over a list of structures containing the wavelength as the main entry and the other information mentioned above in the list as additional entries. Each line is then given a probability of contributing to the spectral line. In the case of multiple spectral lines, inference between spectral lines and their respective levels of confidence will provide a complete picture of the list of probable emitters with a probability factor for each line in order to provide a quantitative assignment of the spectral lines and profiling for a given spectrum. 1. One or more tangible non-transitory computer-readable media having computer-executable instructions for performing a method of running a software program on a computing device , the computing device operating under an operating system , the method including issuing instructions from the software program to automatically quantitatively determine confidence for identification of an emitter represented by a spectral peak , the instructions comprising:receiving a spectral database containing spectral information, said spectral information including a plurality of emitters and a plurality of spectral peaks associated with said plurality of emitters;receiving a spectrum associated with an analyte that includes said emitter;evaluating said spectrum and detecting peaks of said analyte;automatically assigning said peaks to corresponding spectral lines;automatically identifying possible emitters associated with said spectral lines, said identification based on a comparison of said spectral lines to said spectral information contained in said spectral database;normalizing said corresponding spectral lines to indicate signal strength of said possible emitters;calculating said signal strength of said possible emitters associated with intensity of said spectral lines; andautomatically determining a level of confidence of identification of each emitter of said possible ...

OPTICAL PROCESS SENSOR, MEASURING HEAD, MEASURING SYSTEM COMPRISING THE TWO AND METHOD FOR CALIBRATION AND/OR VALIDATION

An optical process sensor for measuring at least one measured variable of a medium in a container includes: a housing; a light source in the housing for emitting transmission light; a light detector in the housing for receiving reception light; and an interface including a first mechanical section, which is an integrated part of the housing, and a first optical section having a first path and a first light guide, wherein the first light guide is configured such that transmission light is guided from the light source into the first path via the first light guide and decouples transmission light from the housing, and having a second path and a second light guide, wherein the second light guide is configured such that reception light is coupled into the interior of the housing and guided from the second path to the light detector via the second light guide. 1. An optical process sensor for measuring at least one measured variable of a medium , the sensor comprising:a housing defining an interior;a light source disposed in the housing and configured to emit transmission light;a light detector disposed in the housing and configured to receive reception light; and a first path and a first light guide, wherein the first light guide is configured such that the transmission light is guided from the light source into the first path via the first light guide and such that the transmission light is decoupled from the housing; and', 'a second path and a second light guide, wherein the second light guide is configured such that the reception light is coupled into the interior of the housing and guided from the second path to the light detector via the second light guide., 'a first optical/mechanical interface comprising a first mechanical section, which is configured as an integrated part of the housing, and a first optical section extending from the housing, the first optical section comprising2. The optical process sensor of claim 1 , wherein the optical process sensor is a ...

PREDICTING AND MEASURING MELANOPIC DOSE

Melanopic dose rate and dose are calculated in a virtual environment. A computer generated model of an actual or planned building is used as the virtual environment. Indirect and direct spherical irradiances are calculated using convex polyhedra throughout the virtual environment, and each is multiplied by a melanopic conversion factor. The two are added, then adjusted for a human's angular responsivity and age. Building design features or lighting devices may be adjusted to provide a required melanopic dose rate. A camera is used to capture a panoramic image, which is calibrated to tristimulus values, and used with the spectral power distribution of the light sources to derive the melanopic dose rate. 1. A method for calculating melanopic dose rate for a direction of gaze at a position in a virtual environment comprising the steps of:a) calculating, by a processor, a direct spherical irradiance at the position from one or more light sources, as a function of angle;b) multiplying, by the processor, the direct spherical irradiance by a melanopic conversion factor that depends on a spectral power distribution of the direct spherical irradiance;c) calculating, by the processor, an indirect spherical irradiance at the position from multiple light source patches, as a function of angle;d) multiplying, by the processor, the indirect spherical irradiance by a melanopic conversion factor that depends on a spectral power distribution of the indirect spherical irradiance;e) adding, by the processor, the products from steps (b) and (d) to form a total spherical melanopic irradiance defined as a function of angle; andf) multiplying, by the processor, the total spherical melanopic irradiance by an angular responsivity that depends on the direction of gaze, to result in the melanopic dose rate.2. The method of claim 1 , comprising calculating claim 1 , by the processor claim 1 , a melanopic dose by multiplying the melanopic dose rate by a dwell time of a virtual observer.3. The ...

COLOUR REFERENCE FOR CALIBRATING A DENTAL COLOUR CAMERA

The invention relates to a color reference for calibrating a dental color camera comprising a plurality of fields. A surface of the color reference comprises color fields for color calibration as well as white fields and/or gray fields for a white balance and/or a shading correction. 1. Color reference for calibrating a dental color camera comprising a plurality of fields having a first color field and a second color field , wherein a surface of the color reference includes color fields for color calibration and white fields and/or gray fields for white balance and/or shading correction , wherein the white fields and/or the gray fields are evenly distributed over the surface of the color reference.2. Color reference according to claim 1 , wherein the color fields include at least three different colors.3. Color reference according to claim 1 , wherein the plurality of fields have a rectangular shape claim 1 , wherein the color fields and the white fields and/or the gray fields are alternately arranged relative to one another claim 1 , in the form of a checkerboard.4. Color reference according to claim 3 , wherein the plurality of fields have a square shape.5. Color reference according to claim 1 , wherein the plurality of fields are immediately adjacent to one another.6. Color reference according to claim 1 , wherein the color reference further comprises a holder claim 1 , wherein the holder is configured to be attached to a color camera in order to arrange the color reference at a defined distance and with a defined orientation relative to the color camera.7. Method for calibrating a dental color camera using the color reference according to claim 1 , wherein the method comprises the steps of:recording the color reference by a dental color camera,producing an optical image,determining a color value and/or at least one brightness value for at least one pixel of at least four of the recorded white fields and/or gray fields and the white balance and/or the shading ...

SYSTEM, METHOD AND APPARATUS FOR IMPROVING THE SPECTRAL RESOLUTION AND SIGNAL-TO-NOISE RATIO OF OPTICAL SPECTROMETER USING DIGITAL BEAM REFOCUSING, REFORMING, SLICING, AND MULTIPLEXING

There is disclosed a novel system and method for improving spectral resolution and signal-to-noise ratio of a captured spectrum by employing digital beam reforming, digital slicing, and digital multiplexing. In an embodiment, the method comprises: and entrance aperture for the light to enter the apparatus, a collimating element (refractive or reflective), a dispersive element (single- or multi-axis), a focusing element (refractive or reflective), and a linear or array detector for acquisition of the spectrum. The spectrum is then digitally beam reformed, digitally beam sliced to increase spectral resolution, and digitally beam multiplexed to increase the signal-to-noise ratio. In addition the disclosed invention is also capable of performing digital beam refocusing which means the optical focusing power can be chosen such that its performance surpasses the performance of any analog optical focusing element thereby further increasing the spectral resolution and the signal-to-noise ratio of the spectrum. The invention can be used as a stand-alone system or can be used in conjunction of any spectrometer even those augmented with optical slicer technologies. The degree of improvement to the spectral resolution is completely tunable and has no bearing of the efficiency of the instrument. 1. A system for improving spectral resolution and signal-to-noise ratio of an optical spectrometer , comprising:a digital beam reformer adapted to receive a spectrally dispersed beam and reform the beam spatially to create a digital beam having a plurality of digital beam portions with at least one spatial dimension smaller than the received beam;a digital beam slicer adapted to split the reformed beam and digitally split and align the plurality of digital beam portions such that their spectral information is aligned with one another; anda digital beam multiplexer adapted to combine the plurality of digital beam portions to form a final spectrum at higher spectral resolution and ...

METHOD FOR IMPROVING THE DYNAMIC RANGE OF A DEVICE FOR DETECTING LIGHT

A method for improving dynamic range of a device for detecting light includes providing at least two detection regions. The detection regions are each formed by an array of a plurality of single-photon avalanche diodes (SPADs) and the detection regions each comprise at least one signal output. A characteristic curve is determined for each of the detection regions. The characteristic curves are combined with one another and/or offset against one another in order to obtain a correction curve and/or a correction factor. 1. A method for improving dynamic range of a device for detecting light , the method comprising:providing at least two detection regions, wherein the detection regions are each formed by an array of a plurality of single-photon avalanche diodes (SPADs) and wherein the detection regions each comprise at least one signal output;determining a characteristic curve for each of the detection regions; andcombining the characteristic curves with one another and/or offsetting the characteristic curves against one another in order to obtain a correction curve and/or a correction factor.2. The method according to claim 1 , further comprising linearizing an overall characteristic curve formed by output signals from the signal outputs based on the correction curve and/or the correction factor.3. The method according to claim 1 , wherein the correction curve and/or the correction factor is determined by dividing the characteristic curves.4. The method according to claim 1 , wherein output signals are corrected claim 1 , after actual detection of the light claim 1 , by digital signal processing.5. The method according to claim 1 , wherein the characteristic curves of the detection regions are determined once by a calibration measurement.6. The method according to claim 1 , wherein the light to be detected impinges on the detection regions at different intensities and/or with different spectral ranges.7. The method according to claim 1 , further comprising activating ...

NOISE REDUCTION APPARATUS AND DETECTION APPARATUS INCLUDING THE SAME

A noise reduction apparatus includes a first delaying/combining unit configured to output first and second pulse light beams, and a second delaying/combining unit configured to branch the first pulse light beam into two pulse light beams to output third and fourth pulse light beams and branch the second pulse light beam into two pulse light beams to output fifth and sixth pulse light beams. 1. A noise reduction apparatus comprising:a first delaying/combining unit configured to branch a pulse light beam of a first period into two pulse light beams, provide a first delay time between the two branched pulse light beams, and combine the two branched pulse light beams, to output a first pulse light beam polarized in a first direction and a second pulse light beam polarized in a direction orthogonal to the first direction and delayed by the first delay time with respect to the first pulse light beam;a second delaying/combining unit configured to branch the first pulse light beam into two pulse light beams, provide a second delay time between the two branched pulse light beams, combine the two branched pulse light beams, to output a third pulse light beam polarized in a second direction and a fourth pulse light beam polarized in a direction orthogonal to the second direction and delayed by the second delay time with respect to the third pulse light beam, branch the second pulse light beam into two pulse light beams, provide the second delay time between the two branched pulse light beams, and combine the two branched pulse light beams, to output a fifth pulse light beam polarized in the second direction and a sixth pulse light beam polarized in a direction orthogonal to the second direction and delayed by the second delay time with respect to the fifth pulse light beam, anda polarization adjustment unit configured to adjust a polarization direction of the first pulse light beam and a polarization direction of the second pulse light beam,wherein the polarization adjustment ...

Analyte system and method for determining hemoglobin parameters in whole blood

A replaceable cuvette assembly for use in an optical absorbance measurement system for measuring whole-blood hemoglobin parameters or whole-blood bilirubin parameters. The replaceable cuvette assembly includes a cuvette substrate and a cuvette module fixedly connected to the cuvette substrate wherein the cuvette substrate is a support for securing the cuvette assembly within the optical absorbance measurement system. The cuvette module has a sample inlet port, a sample outlet port, an electronic chip assembly, a sample receiving chamber that fluidly communicates with the sample inlet port and the sample outlet port, a first cuvette window, and a second cuvette window forming a portion of the sample receiving chamber. The first cuvette window and the second cuvette window are aligned with each other defining a cuvette optical path length between the first cuvette window and the second cuvette window and disposed within an optical path of the optical absorbance measurement system. 1. A replaceable cuvette assembly for use in an optical absorbance measurement system for measuring whole-blood hemoglobin parameters or whole-blood bilirubin parameters , the cuvette assembly comprising:a cuvette substrate; anda cuvette module fixedly connected to the cuvette substrate wherein the cuvette substrate is a support for securing the cuvette assembly within the optical absorbance measurement system, the cuvette module having a sample inlet port, a sample outlet port, an electronic chip assembly, a sample receiving chamber that fluidly communicates with the sample inlet port and the sample outlet port, a first cuvette window, and a second cuvette window forming a portion of the sample receiving chamber wherein the first cuvette window and the second cuvette window are aligned with each other defining a cuvette optical path length between the first cuvette window and the second cuvette window and disposed within an optical path of the optical absorbance measurement system.2. The ...

Spectroscopy apparatus and method

There is presented a spectroscopic apparatus and method wherein an input light source that inputs pump light to a photon pair source. The photon pair source converts pump photons into signal and idler photon pairs. The photon pair source is, in some of examples described herein, tuneable so that the wavelength of the signal and idler photons can be changed by application of a tuning means. At least one of the signal and idler photons is made incident upon a medium under test. A heralding detection apparatus is used to detect any signal and idler photons output from the spectroscopy apparatus, wherein at least one of the photons of the pair has interacted with or been operated upon by the medium under test.

COMPENSATION FOR GOOS-HANCHEN ERROR IN AUTOFOCUS SYSTEMS

Prediction of a distribution of light in an illumination pupil of an illumination system includes identifying component(s) of the illumination system the adjustment of which affects this distribution and simulating the distribution based on a point spread function defined in part by the identified components. The point spread function has functional relationship with configurable setting of the illumination settings. 1. A surface position detecting apparatus comprising:a projection system configured to project light onto a surface of a chosen workpiece to form a pattern of light distribution thereon, the pattern including a first area with a first level of illumination and a second area with a second level of illumination, the first level being lower than the second level; a polarization filter unit configured to receive light said light in reflection from the surface of the workpiece and to separate said light into a first light portion having a first state of polarization and a second light portion having a second state of polarization, the first and second states of polarization being different from one another;', 'a first optical detector unit disposed (i) to acquire the first light component, (ii) to detect, in said first light component, a first distribution of light corresponding to said pattern, and (iii) to generate a first output signal in response to having detected said first distribution of light;', 'a second optical detector unit disposed (a) to acquire the second light component (b) to detect, in said second light component, a second distribution of light corresponding to said pattern, and (c) to generate a third output signal in response to having detected said second distribution of light;, 'a light detecting system including'}anda controller unit operably cooperated with the light detecting systems and configured to calculate a position of the surface of the workpiece based on the first and second output signals.2. The surface position detecting ...

METHOD FOR CALIBRATING A SPECTROMETER

The present disclosure discloses a method for calibrating a spectrometer, comprising the steps of: transmitting light by means of a light source, wherein the light source has a known and substantially temporally steady emission spectrum; receiving the light as a receiving spectrum; comparing the receiving spectrum to the emission spectrum and determining a deviation; and taking into account the determined deviation during subsequent measurements using the spectrometer, if the deviation is greater than a tolerance value. 113-. (canceled)14. A method for calibrating a spectrometer , comprising the steps of:transmitting light by means of a light source, wherein the light source has a known and temporally steady emission spectrum,receiving the light as a receiving spectrum,comparing the receiving spectrum to the emission spectrum and determining a deviation, andtaking into account the determined deviation during subsequent measurements using the spectrometer, if the deviation is greater than a tolerance value.15. The method according to claim 14 , further comprising the step of:performing an adjustment if the determined deviation is greater than the tolerance value.16. The method according to claim 14 ,wherein the emission spectrum of the light source is temperature-stable with respect to the process.17. The method according to claim 14 ,wherein the emission spectrum of the light source is temperature-independent.18. The method according to claim 14 ,wherein the emission spectrum comprises at least two peaks, and the comparison of the receiving spectrum with the emission spectrum is performed on the basis of the peaks.19. The method according to claim 14 ,wherein the light is transmitted through a defined test medium in order to calibrate the spectrometer.20. The method according towherein the test medium is air or nitrogen.21. The method according to claim 14 ,wherein taking into account the determined deviation includes a temperature compensation.22. A measuring ...

Diagnosis Assistance Device For Optical Characteristic Measurement Device, And Diagnosis Assistance Method For Optical Characteristic Measurement Device

A diagnosis assistance device assists a diagnosis of an optical characteristic measurement device which operates on the basis of the content of setting stored in a setting storage unit of an optical characteristic measurement device, and includes a first storage unit, a second storage unit, a processing unit, a first command unit, a diagnosis unit, and a second command unit. The first storage unit stores in advance first setting information which indicates the content of setting at the time of diagnosis. The processing unit performs processing of acquiring, from the setting storage unit, second setting information which is stored in advance in the setting storage unit and indicates the content of setting at the time of use, and storing the acquired second setting information in the second storage unit. The first command unit issues a command to store the first setting information stored in the first storage unit in the setting storage unit. The diagnosis unit acquires a measurement result indicating a value measured by the optical characteristic measurement device which operates on the basis of the content of setting indicating the first setting information stored in the setting storage unit. The second command unit issues a command to store the second setting information stored in the second storage unit in the setting storage unit after the measurement result is acquired. 1. A diagnosis assistance device of an optical characteristic measurement device for assisting a diagnosis of the optical characteristic measurement device operated on the basis of a content of setting stored in a hardware processor of the optical characteristic measurement device at a time of use and at a time of diagnosis of the optical characteristic measurement device , comprisinga hardware processor that:stores in advance first setting information indicating the content of setting at the time of diagnosis;performs processing of acquiring, from the hardware processor of the optical ...

CALIBRATION TARGET FOR HYPERSPECTRAL IMAGE SENSOR

A calibration target for a hyperspectral image sensor can include a panel with a predetermined length and width. The calibration target can also include a dispersive fabric overlaying a surface of the panel that refracts and disperses light illuminated from an illumination source to provide light on a plurality of different spectral bands corresponding to spectral bands detectable by the hyperspectral image sensor. 1. A calibration target for a hyperspectral image sensor comprising:a panel with a predetermined length and width; anda dispersive fabric overlaying a surface of the panel that refracts and disperses light illuminated from an illumination source to provide light on a plurality of different spectral bands corresponding to spectral bands detectable by the hyperspectral image sensor.2. The calibration target of claim 1 , wherein the dispersive fabric is a fiber optic fabric.3. The calibration target of claim 2 , further comprising:a lighting system that controls a color of light output by the fiber optic fabric.4. The calibration target of claim 1 , wherein the plurality of different spectral bands comprise at least 100 different spectral bands.5. The calibration target of claim 4 , wherein each of the plurality of spectral bands have a bandwidth of about 15 nanometers or less.6. The calibration target of claim 4 , wherein the plurality of spectral bands have a bandwidth of about 5 nanometers or less.7. The calibration target of claim 1 , wherein the hyperspectral image sensor is implemented on a satellite.8. The calibration target of claim 1 , wherein the hyperspectral image sensor is implemented on an aircraft.9. The calibration target of claim 1 , wherein the illumination source is a natural lighting source.10. The calibration target of claim 1 , wherein the hyperspectral image sensor is between 1 and 400 kilometers away from the calibration target.11. The calibration target of claim 1 , wherein the plurality of different spectral bands correspond to the ...

Cavity Ring-Down Spectroscopy having Interleaved Data Acquisition for Interference Mitigation

Interleaved data acquisition in optical spectroscopy is used to provide interference correction for time-varying interference. Measurements at a reference frequency are used to provide an estimate of the interference. These reference measurements are interleaved with the remaining measurements in order to provide estimates of the interference vs. time at relevant times. The interference being corrected can be spectrally structured or unstructured. 1. A method of performing optical absorption spectroscopy , the method comprising:providing an optical absorption instrument having a tunable optical source;performing optical absorption measurements of one or more analytes in a sample with the optical absorption instrument in a time-sequential series of measurements having interleaved first measurements and second measurements, wherein each of the first and second measurements includes at least a time stamp, an optical source frequency, and an optical loss;{'sub': 'ref', 'wherein all of the first measurements are performed at a reference frequency fof the optical source;'}{'sub': 'ref', 'wherein the second measurements include measurements performed at two or more optical source frequencies other than f;'}determining an interference optical loss spectrum vs. time from the first measurements and from an interference spectral model; andcorrecting the second measurements using the interference optical loss spectrum vs. time to provide interference-corrected second measurements.2. The method of claim 1 , wherein the interference spectral model is frequency-independent interference.3. The method of claim 2 ,{'sub': 'ref', 'wherein the reference frequency fis at a frequency away from spectral peaks of any constituents of the sample; and'}{'sub': 'ref', 'wherein correcting the second measurements comprises directly subtracting interference at fvs. time from the second measurements.'}4. The method of claim 2 ,{'sub': 'ref', 'wherein the reference frequency fis at a frequency of a ...

BACKGROUND CORRECTION IN EMISSION SPECTRA

A method for deriving a background-corrected portion of a measured optical emission spectrum comprising the steps of identifying two or more background correction points from the portion of the measured emission spectrum; deriving a background correction function fitted to the identified background correction points, and applying the background correction function to the portion of the measured emission spectrum so as to produce a background-corrected portion of the emission spectrum, wherein the background correction points are identified from the measured data points by consideration of the gradients between the measured data points. 1. A method for deriving a background-corrected portion of a measured emission spectrum comprising the steps of:identifying two or more background correction points from the portion of the measured emission spectrum;deriving a background correction function fitted to the identified background correction points, and applying the background correction function to the portion of the measured emission spectrum so as to produce a background-corrected portion of the emission spectrum; wherein{'sub': n', 'n, 'the portion of measured emission spectrum comprises measured data points which consist of a series of n intensity values I, at discrete wavelengths or values corresponding to wavelength λ, the series extending from a first measured data point to a last measured data point, and'} (1) identifying a first background correction point as the first measured data point;', {'sub': 'm', '(2) calculating the gradients Gof straight lines between the background correction point just identified and each subsequent measured data point in the series;'}, {'sub': 'm', '(3) identifying a next background correction point as the measured data point which lies on the straight line which has the minimum gradient of all the calculated gradients G;'}, '(4) if the background correction point just identified does not lie at the last measured data point, repeat ...

SPECTROMETER CALIBRATION

Calibrating a spectrometer module includes performing measurements using the spectrometer module to generate wavelength-versus-operating parameter calibration data for the spectrometer module, performing measurements using the spectrometer module to generate optical crosstalk and dark noise calibration data for the spectrometer module, and performing measurements using the spectrometer module to generate full system response calibration data, against a known reflectivity standard, for the spectrometer module. The method further includes storing in memory, coupled to the spectrometer module, a calibration record that incorporates the wavelength-versus-operating parameter calibration data, the optical crosstalk and dark noise calibration data, and the full system response calibration data, and applying the calibration record to measurements by the spectrometer module. 1. A method of calibrating a spectrometer module , the method comprising:performing measurements using the spectrometer module to generate wavelength-versus-operating parameter calibration data for the spectrometer module;performing measurements using the spectrometer module to generate optical crosstalk and dark noise calibration data for the spectrometer module;performing measurements using the spectrometer module to generate full system response calibration data, against a known reflectivity standard, for the spectrometer module; andstoring in memory, coupled to the spectrometer module, a calibration record that incorporates the wavelength-versus-operating parameter calibration data, the optical crosstalk and dark noise calibration data, and the full system response calibration data.2. The method of further including:applying the calibration record to measurements by the spectrometer module.3. The method of further including:{'sub': 'MUT', 'applying the calibration record to measurements of a sample by the spectrometer module to obtain one or more calibrated wavelength-dependent reflectivity values (R ...

Optical measurement device including internal spectral reference

An optical measurement device may include a light source; an emission optic configured to direct a first portion of light generated by the light source to a measurement target; a collection optic configured to receive light from the measurement target; an optical conduit configured to direct a second portion of light generated by the light source to a spectral reference; the spectral reference; a sensor; and a filter. A first portion of the filter may be provided between the collection optic and a first portion of the sensor. A second portion of the filter may be provided between the spectral reference and a second portion of the sensor.

SYSTEM AND METHOD FOR CALIBRATING IMAGING MEASUREMENTS TAKEN FROM AERIAL VEHICLES.

Systems and methods are provided for calibrating spectral measurements taken of one or more targets from an aerial vehicle. Multiple photo sensors may be configured to obtain spectral measurements of one or more ambient light sources. The obtained spectral measurements of the one or more ambient light sources may be used to calibrate the obtained spectral measurements of the target. 1. A system for obtaining calibrated spectrally-resolved images of a target , the system comprising:an aerial vehicle;at least one spectral imaging device disposed at the aerial vehicle, the at least one spectral imaging device being configured to obtain spectrally-resolved images of a target, the target being at least partially illuminated by one or more ambient light sources, the spectrally-resolved images of the target including a first set of spectrally-resolved images of the target; andtwo or more photo sensors configured to obtain spectral measurements of the one or more ambient light sources, the two or more photo sensors having peak responses within a first set of discrete spectral frequency ranges and are configured to obtain a first set of ambient light spectral measurements of the one or more ambient light sources at individual ones of the first set of discrete spectral frequency ranges, the two or more photo sensors comprising a first photo sensor and a second photo sensor, the first photo sensor having a peak response corresponding to a first spectral frequency range of the first set of discrete spectral frequency ranges, the second photo sensor having a peak response corresponding to a second spectral frequency range, the first spectral frequency range being different from the second spectral frequency range, the first photo sensor being configured to obtain a first spectral measurement of the one or more ambient light sources over the first spectral frequency range, the second photo sensor being configured to obtain a second spectral measurement of the one or more ambient ...

OPTICAL ANALYZER

The present invention includes: an optical fiber being provided either of between a light source and a measurement cell and between the measurement cell and a light detection part; and light path switching means adapted to achieve switching between a measurement cell passage state in which a light path formed by light transmission means passes through the measurement cell and a measurement cell non-passage state in which the light path formed by the light transmission means passes through a region different from the measurement cell, wherein calibration processing for a first calibration with a long calibration cycle is performed in the measurement cell passage state, and calibration processing for a second calibration with a short calibration cycle is performed in the measurement cell non-passage state. 1. An optical analyzer comprising:an optical fiber being provided either between a light source and a measurement cell or between the measurement cell and a light detector; anda light path switching means adapted to achieve switching between a measurement cell passage state in which a light path of light passing through the optical fiber passes through the measurement cell and a measurement cell non-passage state in which the light path of the light passing through the optical fiber passes through a region different from the measurement cell, whereincalibration processing for a first calibration with a long calibration cycle is performed in the measurement cell passage state, and calibration processing for a second calibration with a short calibration cycle is performed in the measurement cell non-passage state.2. The optical analyzer according to claim 1 , whereinthe optical fiber is fixed; andthe light path switching means is adapted to move either of the measurement cell and an optical element provided between the optical fiber and the measurement cell to thereby achieve the switching between the measurement cell passage state and the measurement cell non-passage ...

An apparatus for carrying out raman spectroscopy

An apparatus for carrying out Raman spectroscopy on a sample includes a light source for providing a beam of excitation radiation, and an optical system including a spectrograph. The spectrograph includes a grating that divides a beam of scattered light into a spectrum of spatially separated wavelength components and to direct a portion of the spectrum to a detector. The spectrograph includes: 1) a first lens system for focusing the portion of the spectrum onto the detector and 2) a second lens system-configured to provide a focal plane with focal point in the optical path for focusing the beam of excitation radiation and/or the beam of scattered radiation at the focal point. The apparatus including a reference sample arranged in the focal plane, in particular at the focal point, for obtaining a reference spectrum from the reference sample.

LIGHT WAVELENGTH MEASUREMENT METHOD AND LIGHT WAVELENGTH MEASUREMENT APPARATUS

A light wavelength measurement method of measuring a wavelength of target light includes: receiving target light on a second dispersion device that disperses the target light into a plurality of second beams which reach a plurality of positions corresponding to the wavelength of the target light; and measuring the wavelength of the target light, by using the plurality of the second beams as a vernier scale for measuring the wavelength of the target light within a wavelength range specified by a main scale. 1. A spectrum measurement method of measuring a spectrum of input light , the spectrum measurement method comprising:receiving the input light on a dispersion device that separates the input light into a plurality of beams having a predetermined interval, and disperses each of the plurality of beams;causing the plurality of beams output from the dispersion device to overlap a main-scale device having graduations, wherein an interval of the graduations is different from the predetermined interval; andmeasuring the spectrum of the input light by measuring, using a measurement device arranged separately from the main-scale device, an intensity distribution of light obtained by causing the plurality of beams to overlap the main-scale device.2. A spectrum measurement apparatus that measures a spectrum of input light , the spectrum measurement apparatus comprising:a dispersion device that separates the input light into a plurality of beams having a predetermined interval, and disperses each of the plurality of beams, wherein the plurality of beams output from the dispersion device is caused to overlap a main-scale device having graduations, and an interval of the graduations is different from the predetermined interval; anda measurement device that is arranged separately from the main-scale device, and measures the spectrum of the input light by measuring an intensity distribution of light obtained by causing the plurality of beams to overlap the main-scale device. The ...

CALIBRATION FOR FABRY PEROT SPECTRAL MEASUREMENTS

A system for determining a calibrated spectral measurement includes a tunable Fabry-Perot etalon, a detector, and a processor. The tunable Fabry-Perot etalon has a settable gap. The detector measures light intensity transmitted through the tunable Fabry-Perot etalon. The processor is configured to determine the calibrated spectral measurement. The calibrated spectral measurement is based at least in part on a measurement set of detected light intensities for a plurality of settable gaps and a reconstruction matrix. The reconstruction matrix is based at least in part on calibration measurements using multiple source wavelengths and multiple settable gaps. 1. A system for determining a calibrated spectral measurement , comprising:a tunable Fabry-Perot etalon, wherein the tunable Fabry-Perot etalon has a settable gap;a detector, wherein the detector measures light intensity transmitted through the tunable Fabry-Perot etalon; anda processor configured to determine the calibrated spectral measurement, wherein the calibrated spectral measurement is based at least in part on a measurement set of detected light intensities for a plurality of settable gaps and a reconstruction matrix, wherein the reconstruction matrix is based at least in part on calibration measurements using multiple source wavelengths and multiple settable gaps.2. The system as in claim 1 , wherein the settable gap ranges from 500 nm to 1500 nm.3. The system as in claim 1 , wherein the detector comprises an RGB detector.4. The system as in claim 1 , wherein the detector comprises an RGB and IR detector.5. The system as in claim 1 , wherein the detector comprises a monochrome detector.6. The system as in claim 1 , wherein the detector comprises a multiple band detector.7. The system as in claim 1 , wherein one set of the calibration measurements is made using a single narrow wavelength and by detecting intensity for each of a set of the multiple settable gaps.8. The system as in claim 1 , wherein the ...

DEVICE FOR MEASURING COLOUR PROPERTIES

A method for determining colour properties of a target, comprising: 1. A method for determining colour properties of a target , the method comprising:providing an enclosure having first and second opposing end walls and one or more side walls, wherein said first end of said enclosure comprises a first screen having a first aperture therein and having, on its surface within said enclosure, a pattern of coloured sections arranged around said first aperture, wherein each coloured section has a known colour property, and wherein said second end of said enclosure comprises a second screen having a second aperture generally axially in line with said first aperture, no light source being provided within said enclosure;placing said first screen over said target such that a portion of said target is exposed through said first aperture and said pattern of coloured sections is visible through said second aperture;using a digital camera having a lens module, including a sensor, and a flash module adjacent each other, manually placing said lens module and flash module over said second aperture, directed into said enclosure such that substantially no ambient light can enter said enclosure through said second aperture, and, subsequently, substantially simultaneously illuminating, using only said flash module of said digital camera, said screen overlayed on said target and using said lens module to obtain sensor data representative of at least a portion of light reflected from said screen overlayed on said target and received by said sensor;deriving, from said sensor data, reference parameters for the colour properties of said target exposed through said first aperture;deriving, from said sensor data, reference parameters for the colour properties of at least one of said coloured sections;determining a difference between a colour property of said at least one coloured section obtained from respective reference parameters derived therefor and a known colour property thereof; ...

Self-calibration method for tuneable fabry-perot cavity and spectrum acquisition device having self-calibration function

A filter is irradiated with incident light, and calibrated light with a fixed wavelength is obtained after the incident light is transmitted through a calibration filter film on the filter; the calibrated light is selected and transmitted via the Fabry-Perot cavity, and selected light is obtained after the calibrated light is transmitted through the Fabry-Perot cavity; an image chip is irradiated with the selected light for imaging, and an output signal is obtained. When the selected wavelength of the tuneable Fabry-Perot cavity matches the wavelength of the calibrated light transmitted by the calibration filter film at a certain position, light at the position is selected and reaches the imaging chip, and the output signal of the imaging chip at the corresponding position can be used as a detection signal for self-calibration, which does not affect normal imaging at other positions on the filter besides the calibration filter film.

Device For Securing An Infrared Radiation Detector From Unwanted Infrared Radiation And Heat

A device is provided for securing a plurality of infrared radiation detectors from unwanted infrared radiation. The device includes a structure supporting the plurality of infrared radiation detectors. A plurality of nanowires are positioned adjacent to each other so as to define a layer. The layer has an inner surface positioned adjacent an outer surface of the structure and an outer surface directable towards a source of unwanted infrared radiation. The plurality of IR radiation detectors are aligned with a desired field of view so as to receive IR radiation radiating from any objects in the field of view such that a first portion of the IR radiation engages and is absorbed by IR radiation detectors, while a second portion of the IR radiation engages and is absorbed by IR radiation detector is absorbed by layer. 1. A device for securing an infrared radiation detector from unwanted infrared radiation , comprising:a housing defining a cavity therein configured for receiving the infrared radiation detector therein, the housing having an outer surface and a forward wall with an aperture extending through; anda plurality of nanowires positioned adjacent to each other so as to define a layer, the layer having an inner surface positioned adjacent the outer surface of the housing and an outer surface directable towards a source of unwanted infrared radiation.2. The device of wherein the housing includes a rear wall claim 1 , the rear wall configured to support the infrared radiation detector thereon.3. The device of wherein each nanowire of the plurality of nanowires is fabricated from silicon impregnated with silver nanoparticles.4. The device of wherein each nanowire of the plurality of nanowires includes a terminal first end partially defining the inner surface of the layer and a second end.5. The device of wherein the second end of each nanowire of the plurality of nanowires has a generally conical configuration and terminates at a tip.6. The device of wherein the tip ...

Colorimetric Sensor Device And Image Formation Apparatus

A housing (20) has a passage port (3) that serves as both the outlet for the illumination light (IL) to go out of the housing (20) toward a sample surface (S) and the inlet for the reflection light (RL) reflected on the sample surface (S) to enter the housing (20). A transparent member (19) is disposed at the passage port (3) to prevent dust including paper dust from entering the housing (20). A light quantity calculation unit (71) calculates the light quantity of light received by a light reception lens (33). A notification unit (81) performs a predetermined notification when the light quantity is less than or equal to a predetermined value.

COLOR MEASURING APPARATUS

A color measuring apparatus includes a measurement assembly which includes at least one illumination assembly for applying substantially parallel illumination light to a measurement spot of a measurement object and a pick-up assembly for capturing the measurement light radiated back from the measurement spot in an observation direction and for converting the same into corresponding electrical signals. The illumination assembly includes at least two illumination subassemblies which illuminate the measurement spot from different illumination sub-directions near a first preset nominal illumination direction, each with preferably parallel illumination light. By the illumination from different illumination sub-directions slightly deviating from the nominal illumination direction, angular errors of the illumination assembly can be compensated for in a simple manner. 114-. (canceled)15. A method of providing illumination angle error compensation in a color measurement device , the measurement device including at least a first illumination assembly having a first nominal illumination direction with respect to a measurement spot of a measurement object , the first illumination assembly including at least two illumination subassemblies each including a light source and having illumination sub-directions which are angularly offset to each other by an angle (Δε) of 4°-8° and enclose the first nominal illumination direction between them , and a pick-up assembly for capturing the measurement light radiated back from the measurement spot along an observation direction and for converting the same into corresponding electrical signals , said method comprising profiling the measurement device by:performing separate calibration measurements of a reference measurement object with each illumination subassembly providing illumination at their respective actual illumination sub-directions;determining adjustment parameters for the first illumination assembly from the calibration ...

SPECTRAL IMAGING SYSTEM FOR REMOTE AND NONINVASIVE DETECTION OF TARGET SUBSTANCES USING SPECTRAL FILTER ARRAYS AND IMAGE CAPTURE ARRAYS

An approach to noninvasively and remotely detect the presence, location, and/or quantity of a target substance in a scene via a spectral imaging system comprising a spectral filter array and image capture array. For a chosen target substance, a spectral filter array is provided that is sensitive to selected wavelengths characterizing the electromagnetic spectrum of the target substance. Elements of the image capture array are optically aligned with elements of the spectral filter array to simultaneously capture spectrally filtered images. These filtered images identify the spectrum of the target substance. Program instructions analyze the acquired images to compute information about the target substance throughout the scene. A color-coded output image may be displayed on a smartphone or computing device to indicate spatial and quantitative information about the detected target substance. The system desirably includes a library of interchangeable spectral filter arrays, each sensitive to one or more target substances. 15-. (canceled)6. A method of providing an imaging system for detecting a target substance in a scene , comprising the steps of:a) providing spectral information for a target substance;b) using the spectral information to associate a plurality of specific bandwidth portions of the electromagnetic spectrum with spectral characteristics of the target substance; i) an image capture array comprising at least two image capturing elements, each image capturing element capable of independently capturing an image of the scene;', 'ii) a filter array comprising a plurality of filter elements, each sensitive to a pre-determined specific bandwidth portion, and wherein the filter elements are each aligned with a corresponding camera element of the image capture array in a manner such that the image capture array captures image information for a plurality of independent spectrally filtered images;', 'iii) program instructions that use the captured image information ...

Method for Correcting a Wavelength and Tuning Range of a Laser Spectrometer

A method for correcting a wavelength and a tuning range of a laser spectrometer in which the light from a wavelength-tunable laser diode, after being radiating through a gas, is detected and evaluated, wherein the laser diode is periodically driven with a current ramp, such that a time-resolved absorption spectrum of the gas is obtained upon the detection of the light, where in order to correct the wavelength and the tuning range of the laser spectrometer, a first step involves readjusting the central wavelength of the laser diode via the temperature thereof and based on the position of one of two different selected absorption lines in the detected absorption spectrum, and a second step involves correcting the tuning range of the laser diode via the gradient of the current ramp such that the spacing of the two absorption lines in the detected absorption spectrum remains constant. 113.-. (canceled)14. A method for correcting a wavelength and a tuning range of a laser spectrometer , in which light of a wavelength-tunable laser diode is detected and evaluated after radiating through a gas , the laser diode being periodically driven with a current ramp , such that a time-resolved absorption spectrum of the gas is obtained upon the detection of the light , whereincomparing, in a currently obtain absorption spectrum an actual position of an absorption line of the gas with a target position of the same absorption line detected and stored in a preceding one-off adjustment of the laser spectrometer;changing, in a correction step, with a deviation of the actual position of the absorption line from the target position, a temperature of the laser diode until an actual position corresponds to the target position;comparing, in the absorption spectrum currently obtained, the actual position of a further absorption line with the target position of the same absorption line detected and stored in a preceding one-off adjustment of the laser spectrometer; andchanging, in a further ...

DIVIDED-APERTURE INFRA-RED SPECTRAL IMAGING SYSTEM

Various embodiments disclosed herein describe a divided-aperture infrared spectral imaging (DAISI) system that is adapted to acquire multiple IR images of a scene with a single-shot (also referred to as a snapshot). The plurality of acquired images having different wavelength compositions that are obtained generally simultaneously. The system includes at least two optical channels that are spatially and spectrally different from one another. Each of the at least two optical channels are configured to transfer IR radiation incident on the optical system towards an optical FPA unit comprising at least two detector arrays disposed in the focal plane of two corresponding focusing lenses. The system further comprises at least one temperature reference source or surface that is used to dynamically calibrate the two detector arrays and compensate for a temperature difference between the two detector arrays. 1. An infrared (IR) imaging system configured to image a scene , the imaging system comprising:a plurality of spatially and spectrally different optical channels comprising a plurality of cameras configured to image the scene;at least one thermal reference source having a known temperature placed in front of the plurality of cameras and configured to be imaged by the plurality of cameras; anda data-processing unit comprising a processor, acquire with the plurality of cameras a plurality of frames having regions that include images of the reference source; and', 'apply a dynamic calibration correction to the plurality of cameras to allow at least one camera in the plurality of cameras to be calibrated to agree with another camera in the plurality imaging the reference source., 'wherein the imaging system is configured to2. The system of claim 1 , wherein the system includes at least four optical channels.3. The system of claim 1 , wherein the system includes at least eight optical channels.4. The system of claim 1 , wherein a first optical channel comprises a first FPA ...

TARGET COMPONENT CALIBRATION DEVICE, ELECTRONIC DEVICE, AND TARGET COMPONENT CALIBRATION METHOD

A target component calibration device includes a mixing coefficient calculating section that calculates mixing coefficients of target components regarding a test object based on observational data regarding the test object and calibration data, and a target component content calculating section that calculates the content of target components based on the mixing coefficients calculated by the mixing coefficient calculating section and a simple regression equation representing the relationship between the content and the mixing coefficients corresponding to the target components. The target component content calculating section adjusts at least one of two constants of the simple regression equation depending on a measurement condition when the observational data is obtained. 1. A target component calibration device that calculates the content of target components of a test object , the device comprising:a test object observational data obtaining section that obtains observational data regarding the test object;a calibration data obtaining section that obtains calibration data which includes independent components corresponding to the target components and a calibration simple regression equation;a mixing coefficient calculating section that calculates mixing coefficients of the target components regarding the test object based on the calibration data and the observational data regarding the test object; anda target component content calculating section that calculates the content of target components based on the simple regression equation representing the relationship between the content and the mixing coefficients corresponding to the target components, and the mixing coefficients calculated by the mixing coefficient calculating section,wherein the target component content calculating section adjusts at least one of two constants of the simple regression equation depending on a measurement condition when the observational data is obtained.2. The target component ...

CALIBRATION CURVE GENERATION METHOD, CALIBRATION CURVE GENERATION DEVICE, TARGET COMPONENT CALIBRATION METHOD, TARGET COMPONENT CALIBRATION DEVICE, ELECTRONIC DEVICE, GLUCOSE CONCENTRATION CALIBRATION METHOD, AND GLUCOSE CONCENTRATION CALIBRATION DEVICE

A calibration curve generation method includes acquiring an independent component matrix including independent components of each sample the independent component matrix by performing first pre-processing that includes normalizing observation data, second pre-processing that includes whitening, and independent component analysis processing in order. Further, the same noise is added to the observation data related to a plurality of samples in the first pre-processing. 1. A calibration curve generation method of generating a calibration curve used for deriving a content of a target component of a subject from observation data of the subject , the method comprising:estimating a plurality of independent components when the observation data for each sample of the subject is divided into the plurality of independent components and acquiring a mixing coefficient corresponding to the target component for each of the samples based on the plurality of independent components,wherein the estimating of the plurality of independent components includes:(i) acquiring an independent component matrix that includes the independent components of each of the samples;(ii) acquiring an estimated mixed matrix indicating a set of vectors that define a ratio of independent component elements for each of the independent components in each of the samples from the independent component matrix; and(iii) acquiring a correlation with respect to the content of the target component of the plurality of samples for each of the vectors included in the estimated mixed matrix and selecting the vector determined that the correlation is the maximum as a mixing coefficient corresponding to the target component,Wherein the independent component matrix is acquired by performing first pre-processing that includes normalizing the observation data, second pre-processing that includes whitening, and independent component analysis processing in order, andWherein the same noise is added to the observation data ...

APPARATUS AND METHOD FOR ESTIMATING CONCENTRATION OF ANALYTE, AND CALIBRATION METHOD

An apparatus for estimating a concentration of an analyte includes an optical sensor configured to emit light toward an object and receive light reflected from the object, and a processor configured to obtain a ratio of an absorption coefficient to a scattering coefficient based on the received light, obtain a first absorption spectrum of the object based on the obtained ratio, obtain a second absorption spectrum by eliminating a scattering correction spectrum from the first absorption spectrum, the scattering correction spectrum corresponding to a nonlinear change in the scattering coefficient according to a wavelength of the emitted light, and estimate a concentration of an analyte based on the second absorption spectrum. 1. An apparatus for estimating a concentration of an analyte , the apparatus comprising:an optical sensor configured to emit light toward an object and receive light reflected from the object; anda processor configured to:obtain a ratio of an absorption coefficient to a scattering coefficient based on the received light,obtain a first absorption spectrum of the object based on the obtained ratio,obtain a second absorption spectrum by eliminating a scattering correction spectrum from the first absorption spectrum, the scattering correction spectrum corresponding to a nonlinear change in the scattering coefficient according to a wavelength of the emitted light, andestimate a concentration of an analyte based on the second absorption spectrum.2. The apparatus of claim 1 , wherein the processor is further configured to:obtain a reflectance of the object based on the received light,obtain an albedo of the object based on the obtained reflectance, andobtain the ratio of the absorption coefficient to the scattering coefficient based on the obtained albedo.3. The apparatus of claim 1 , wherein the processor is further configured to obtain the first absorption spectrum based on a function of the ratio of the absorption coefficient to the scattering ...

Optical fiber calibration connector

The present invention relates to an optical fiber connector for mating a first group of one or more optical fibers ( 102 ) with one or more corresponding optical fibers in a second group of one or more optical fibers ( 103 ). The optical fiber connector in dudes a shutter ( 105 ), which prevents the ingress of debris into the connector, and provides an optical reference surface with which to calibrate optical fibers that are inserted into the connector. The optical fiber connector finds application in the general optical fiber field, and more particularly finds application in the medical field in which it may be used to connect optical fibers in a photonic needle application.

DIVIDED-APERTURE INFRA-RED SPECTRAL IMAGING SYSTEM

Various embodiments disclosed herein describe a divided-aperture infrared spectral imaging (DAISI) system that is adapted to acquire multiple IR images of a scene with a single-shot (also referred to as a snapshot). The plurality of acquired images having different wavelength compositions that are obtained generally simultaneously. The system includes at least two optical channels that are spatially and spectrally different from one another. Each of the at least two optical channels are configured to transfer IR radiation incident on the optical system towards an optical FPA unit comprising at least two detector arrays disposed in the focal plane of two corresponding focusing lenses. The system further comprises at least one temperature reference source or surface that is used to dynamically calibrate the two detector arrays and compensate for a temperature difference between the two detector arrays. 1. An infrared (IR) imaging system , comprising:an optical system comprising at least two optical channels that are spatially and spectrally different from one another and positioned to transfer IR radiation incident on the optical system towards at least two detectors;at least one reference having an unknown temperature and imaged by the at least two detectors; and acquire a plurality of frames from the at least two detectors, the plurality of frames comprising at least one region that corresponds to the at least one reference, and', 'adjust one or more parameters of the at least two detectors based on a temperature estimate of the at least one reference., 'a data-processing unit configured to2. The IR imaging system of claim 1 , wherein the at least one reference is displaced away from a conjugate image plane of the at least two detectors such that an image of the at least one reference claim 1 , captured by the at least two detectors claim 1 , is defocused.3. The IR imaging system of claim 1 , wherein the at least one reference is positioned at a conjugate image ...

DIFFUSE REFLECTANCE INFRARED FOURIER TRANSFORM SPECTROSCOPY

Diffuse reflectance spectroscopy apparatus for use in analysing a sample comprising a sample receiving location for receiving a sample for analysis; an illumination arrangement for directing light towards a received sample; a detector for detecting light reflected by a received sample; and collection optics for directing light reflected by a received sample towards the detector. The illumination arrangement further comprises an interferometer and a half beam block which is disposed substantially at a focus in the optical path for blocking light which exits the interferometer, passes said focus, and is reflected from re-entering the interferometer. A half beam block may be disposed in the optical path between the interferometer and the light source for blocking light that exits the interferometer back towards the light source and is reflected by the light source from re-entering the interferometer and/or a half beam block may be disposed in the optical path on the opposite side of the interferometer than the light source. 1. Diffuse reflectance spectroscopy apparatus for use in analysing a sample comprising:a sample receiving location for receiving a sample for analysis;an illumination arrangement for directing light from a light source towards a received sample;a detector for detecting light reflected by a received sample; andcollection optics for directing light reflected by a received sample towards the detector, wherein the illumination arrangement comprises an interferometer and a half beam block disposed substantially at a focus in the optical path between the interferometer and the light source for blocking light that exits the interferometer back towards the light source and is reflected by the light source from re-entering the interferometer.2. (canceled)3. (canceled)4. Diffuse reflectance spectroscopy apparatus according to in which the illumination arrangement comprises a second half beam block claim 1 , which is disposed in the optical path on the ...

Apparatuses And Methods For Bio-Sensing Using Unmanned Aerial Vehicles

Described herein are methods, apparatuses, and systems that enable a light weight autonomous unmanned aerial vehicle (UAV) to process hyperspectral (HSI) data during its flight and send information to the ground computer via radio-link. This capability is not currently available owing to the severe combination of technical constraints: the typical processing power required to analyze HSI data in real time; the small space and power available for the payload in a light-weight UAV; and the limited bandwidth available on the wireless link. 1. A method for bio-sensing comprising:within an unmanned aerial vehicle comprising an optionally-detachable first general purpose digital computer system and an optionally-detachable hyperspectral imager, making a first special-purpose digital computer system by storing a first executable application program in a memory of the first general purpose digital computer system, and executing the stored program to impart to the first general purpose computer system the functionality of at least analyzing data from the hyperspectral imager, by changing the state of a one or more processors within the first general purpose computer system when aerial vehicle program instructions are executed; andflying the aerial vehicle, including the hyperspectral imager, over at least a portion of a field of crops which are arranged in the form of a plurality of plant rows, the plant rows separated in an alternating pattern by a plurality of soil regions, while executing the aerial vehicle program instructions;obtaining a priori information comprising a spectral signature for said plant rows and a spectral signature for said soil regions;obtaining from the hyperspectral imager a series of images of the portion of the field of crops, comprising an image of the plurality of rows, wherein a first plurality of the pixels are generated by light obtained solely from the plant rows, and a second plurality of the pixels are generated by light obtained solely ...

METHOD OF SPECTRAL ANALYZING WITH A COLOR CAMERA

A method of spectral analyzing with a color camera is provided, and the method includes: calibrating a color camera to obtain a quantum efficiency database of the color camera; shooting a detection area with the color camera, the detection area including at least one object, to obtain the color content data of the at least one object; and comparing the color content data to the quantum efficiency database to analyze the at least one object. 1. A method of spectral analyzing with a color camera , comprising:calibrating a color camera to obtain a quantum efficiency database of the color camera; shooting a detection area covering at least one object with the color camera to obtain color content data of the at least one object; andcomparing the color content data with the quantum efficiency database to analyze the at least one object.2. The method of claim 1 , wherein the step of calibrating a color camera comprises: illuminating an image sensor of the color camera with a light beam claim 1 , wherein the light beam is a narrow bandwidth light beam.3. The method of claim 1 , wherein the step of shooting a detection area with the color camera comprises: providing an imaging lens set on the color camera to shoot the detection area.4. The method of claim 1 , further comprising: shooting a qualified product with the color camera to obtain a standard color content data.5. The method of claim 4 , further comprising: comparing the standard color content data with the quantum efficiency database to set a qualified range.6. The method of claim 5 , further comprising: comparing the color content data of the at least one object obtained from the color camera with the quantum efficiency database to know whether the at least one object is qualified.7. The method of claim 5 , further comprising: comparing the color content data of the at least one object obtained from the color camera with the standard color content data to know whether the at least one object is qualified. This ...

COLORIMETER CALIBRATION

A colorimeter with multiple sensings of light to provide higher accuracy measurements of the primaries of a human-standard observer based color space is provided. This color space (target color space) must have the characteristic of two chromaticity coordinates and an achromatic primary like CIELAB, CIELUV or xyY in CIE 1931. The calibration of the device includes training with a set of calibration illuminants. Two sets of calibration-factors are determined. The first set of calibration factors yields intensity of primaries optimized with respect to chromaticity, the second set yields the optimized intensity of the achromatic primary. The combination of these sets of calibration factors enable the colorimeter to deliver values of that light with respect to three primaries of a human-standard-observer-based color space optimized with respect to chromaticity and the achromatic primary. 1. A method of calibrating a colorimeter arranged to measure light with a sensor arrangement providing n sensings with different spectral sensitivities , n being a number greater than or equal to four , and to measure that light in the form of three primaries of a human-standard-observer-based color space , wherein one of the three primaries is an achromatic primary , the method comprising:generating m sets of n sensings for m calibration illuminants with known values of the three primaries, wherein m is a number greater than n,determining a first set of calibration factors that yields chromaticity-optimized values of the primaries when applied to signals measured by the n sensings,by minimizing a norm of chromaticity distances of all calibration illuminants between (i) chromaticity values retrieved by applying the first set of calibration factors to the signals measured by the n sensings, and (ii) known chromaticity values,determining a second set of calibration factors that yields an optimized value of the achromatic primary when applied to the signals measured by the n sensings,by ...

SIGNAL PROCESSING FOR TUNABLE FABRY-PEROT INTERFEROMETER BASED HYPERSPECTRAL IMAGING

A system for determining a calibrated spectral measurement includes a tunable Fabry-Perot etalon, a detector, and a processor. The tunable Fabry-Perot etalon has a settable gap. The detector measures light intensity. The processor is configured to determine the calibrated spectral measurement. The calibrated spectral measurement is based at least in part on a measurement set of detected light intensities for a plurality of settable gaps and a reconstruction matrix. The reconstruction matrix is based at least in part on calibration measurements. For a calibration measurement, a settable gap is selected and a set of input monochromatic source wavelengths is used to measure responses at a detector after transmission through the Fabry-Perot etalon. Each input monochromatic source wavelength is also measured using a radiometer to scale detector measurements. 1. A system for determining a calibrated spectral measurement , comprising:a tunable Fabry-Perot etalon, wherein the tunable Fabry-Perot etalon has a settable gap;a detector, wherein the detector measures light intensity; anda processor configured to determine the calibrated spectral measurement, wherein the calibrated spectral measurement is based at least in part on a measurement set of detected light intensities for a plurality of settable gaps and a reconstruction matrix, wherein the reconstruction matrix is based at least in part on calibration measurements, wherein for a calibration measurement a settable gap is selected and a set of input monochromatic source wavelengths is used to measure responses at a detector after transmission through the Fabry-Perot etalon, and wherein each input monochromatic source wavelength is also measured using a radiometer to scale detector measurements.2. The system of claim 1 , wherein the tunable Fabry-Perot etalon is disposed between an illumination source and a target.3. The system of claim 1 , wherein the tunable Fabry-Perot etalon is disposed between a target and the ...

Shutter Assembly For Calibration

Described are a shutter assembly, a spectrometer, and a method for calibrating a spectrometer. For example, the method may include positioning a shutter including a mirror into a first position in an illumination path of an excitation light beam such that a measurement window is blocked. The mirror may be operable to direct at least one of: (1) the illumination path to a spectral calibration material, (2) a first collection path extending from the spectral calibration material, and (3) a second collection path of a spectral calibration light beam. The method may include directing a returned light from the receiving optics unit to an imaging device; processing the returned light at the imaging device into one or more image signals; analyzing and comparing the image signals with approved image signals; and providing an indication of whether the comparative results of the analysis are within acceptable tolerances. 1. A shutter assembly for use with a spectrometer , the shutter assembly comprising:a shutter comprising a mirror, the mirror operable to direct at least one of:(1) an illumination path of an excitation light beam to a spectral calibration material at a location distinct from the shutter, the spectral calibration material operable to alter the excitation light beam in order to generate a consistent spectrum within wavelengths utilizable by a receiving optics unit and an imaging device in the spectrometer,(2) a first collection path of the excitation light beam extending from the spectral calibration material, and(3) a second collection path of a spectral calibration light beam, the spectral calibration light beam comprising a desired spectral feature utilizable by the receiving optics unit and the imaging device in the spectrometer; and [ (a) the excitation light beam strikes the mirror and is directed to the spectral calibration material,', '(b) the first collection path, comprising the consistent spectrum, is directed by the mirror toward the receiving ...

Apparatus and Method for Calibrating Raman Shift

A device for performing Raman spectroscopy measurements that incorporate Raman Shift calibration and related method for carrying out the Raman Shift calibration are disclosed. The device comprises of one or more Raman shift reference materials with one or more Raman bands, the positions of which are pre-determined to a high degree of accuracy within a useful temperature range. The device further comprises a sensor to measure the temperature of the one or more reference materials to provide accurate reference values for the Raman shift calibration. When used with the measured spectrum of the reference materials, an accurate Raman Shift calibration function of the device can be generated. 1. A method for calibrating a Raman shift axis of a Raman spectrometer using one or more Raman shift reference materials , wherein the Raman spectrometer comprises an excitation source , a spectral analyzer , a sample interface , and a temperature sensor , wherein the one or more Raman shift reference materials have one or more Raman peaks , and the relationships between the Raman shift values of the one or more Raman peaks and temperature are pre-established over a temperature range , the method comprising:measuring one or more calibration Raman spectra and a temperature of the one or more Raman shift reference materials;determining the Raman shift values of the one or more Raman peaks in the one or more calibration Raman spectra based on the measured temperature and a pre-established relationship between the Raman shift values and the temperature; andusing the determined Raman shift values of the one or more Raman peaks and the measured one or more calibration Raman spectra to generate a Raman shift calibration function for the Raman spectrometer.2. The method of claim Error! Reference source not found. , further comprising measuring one or more spectra of one or more wavelength calibration light sources and generating a wavelength calibration function.3. The method of claim 1 , ...

PULSED LIGHT WAVEFORM MEASUREMENT METHOD AND WAVEFORM MEASUREMENT DEVICE

In a waveform measurement method, first, initial pulsed light is spatially dispersed for respective wavelengths. Next, the initial pulsed light is input to a polarization dependent type SLM in a state where a polarization plane is inclined with respect to a modulation axis direction, and a phase spectrum of a first polarization component of the initial pulsed light along the modulation axis direction is modulated, to cause a time difference between first pulsed light Lpincluding the first polarization component and second pulsed light Lpincluding a second polarization component orthogonal to the first polarization component. After combining the wavelength components, an object is irradiated with the pulsed light Lpand the pulsed light Lp, and light generated in the object is detected. The above detection operation is performed while changing the time difference, and a temporal waveform of the pulsed light Lpis obtained. 1. A pulsed light waveform measurement method comprising:performing a time difference generation of spatially dispersing initial pulsed light for respective wavelengths, inputting the initial pulsed light after the dispersion to a polarization dependent type spatial light modulator in a state where a polarization plane is inclined with respect to a polarization direction in which a modulation function is obtained in the spatial light modulator, and combining wavelength components after modulating a phase spectrum of a first polarization component of the initial pulsed light along the polarization direction, to cause a time difference between first pulsed light including the first polarization component and second pulsed light including a second polarization component of the initial pulsed light orthogonal to the first polarization component;performing a light detection of irradiating an object with the first pulsed light and the second pulsed light, and detecting light generated in the object due to the irradiation; andperforming an analysis of ...

REFERENCING SYSTEM

A reference imaging system including a planar reference piece. The reference imaging system further includes a three-axis gantry for positioning the planar reference piece at a plurality of points in a 3D coordinate system. Additionally, the reference imaging system includes a yaw actuator for adjusting the yaw angle of the object. Furthermore, the reference imaging system includes a pitch actuator for adjusting the pitch of the object. Moreover, the reference imaging system includes a computer processing unit for controlling the 3D position, pitch and yaw of the planar reference piece. 1. A reference imaging system , comprising:a planar reference piece;a three-axis gantry for positioning the planar reference piece at a plurality of points in a 3D coordinate system;a yaw actuator for adjusting the yaw angle of the object;a pitch actuator for adjusting the pitch of the object; anda computer processing unit for controlling the 3D position, pitch and yaw of the planar reference piece.2. The system of claim 1 , further comprising an imager for recording images and reflectance data of the object.3. The system of claim 1 , wherein the computer processing unit records the reflectance data of the object at the plurality of points.4. The system of claim 3 , wherein the computer processing unit compares the reflectance data of the planar reference piece with reflectance data of a sample to determine a corrected image of the sample.5. A reference imaging system claim 3 , comprising:a reference piece having a rectangular planar shape;a two-axis gantry for positioning the reference piece at a plurality of points in a 3D coordinate system, and wherein the width of the white reference object defines a first dimensional range of the coordinate system;a yaw actuator for adjusting the yaw angle of the object;a pitch actuator for adjusting the pitch of the object; anda computer processing unit for controlling the 3D position, pitch and yaw of the reference piece.6. The system of claim ...

MOBILE GAS AND CHEMICAL IMAGING CAMERA

In one embodiment, an infrared (IR) imaging system for determining a concentration of a target species in an object is disclosed. The imaging system can include an optical system including an optical focal plane array (FPA) unit. The optical system can have components defining at least two optical channels thereof, said at least two optical channels being spatially and spectrally different from one another. Each of the at least two optical channels can be positioned to transfer IR radiation incident on the optical system towards the optical FPA. The system can include a processing unit containing a processor that can be configured to acquire multispectral optical data representing said target species from the IR radiation received at the optical FPA. Said optical system and said processing unit can be contained together in a data acquisition and processing module configured to be worn or carried by a person. 1165-. (canceled)166. An optical system comprising:an optical detector;a lens spaced from the optical detector along an axis, the lens positioned to transfer light to the optical detector;a first thermal element comprising a first material having a first coefficient of thermal expansion (CTE); anda second thermal element mechanically and thermally coupled to the first thermal element and the lens, wherein the second thermal element comprises a second material having a second CTE, and wherein the second CTE is different from the first CTE;wherein, in response to a temperature change, respective lengths of the first and second thermal elements change so as to adjust a position of the lens relative to the optical detector along the axis.167. The system of claim 166 , further comprising a base structure claim 166 , wherein the optical detector is coupled with the base structure.168. The system of claim 167 , wherein the first thermal element is mechanically and thermally coupled with the base structure.169. The system of claim 166 , wherein a focal length of the ...

A method for determining the spectral scale of a spectrometer and apparatus

A method for determining spectral calibration data (λ(S), S(λ)) of a Fabry-Perot interferometer () comprises: 1. A method for determining spectral calibration data (λ(S) , S(λ)) of a Fabry-Perot interferometer , the method comprising:{'sub': 1', '2', '1', '1', '2', '1, 'b': '1', 'forming a plurality of filtered spectral peaks (P′, P′) by filtering input light (LB) with a Fabry-Perot etalon such that a first filtered peak (P′) corresponds to a first transmittance peak (P) of the etalon, and such that a second filtered peak (P′) corresponds to a second transmittance peak (P) of the etalon,'}{'sub': d', '1', '2', 'd', 'FP', 'd', 'FP, 'using the Fabry-Perot interferometer for measuring a spectral intensity distribution (M(S)) of the filtered spectral peaks (P′, P′), wherein the spectral intensity distribution (M(S)) is measured by varying the mirror gap (d) of the Fabry-Perot interferometer and by providing a control signal (S) indicative of the mirror gap (d), and'}{'sub': cal', 'd', 'd,cal', 'd', 'E, 'determining the spectral calibration data (λ(S), S(λ)) by matching the measured spectral intensity distribution (M(S)) with the spectral transmittance (T(λ)) of the etalon'}2. The method of claim 1 , wherein the spectral calibration data (λ(S) claim 1 , S(λ)) determines a relation for obtaining spectral positions (λ) from values of the control signal (S).3. The method of claim 1 , wherein the minimum spectral transmittance (T) of the etalon is lower than or equal to 90% of the maximum spectral transmittance (T) of the etalon.4111. The method according to claim 1 , wherein first spectral calibration data (λ(S) claim 1 , S(λ)) is determined by using input light (LB) obtained from an object (OBJ) claim 1 , and a calibrated spectrum (I(λ)) of an object (OBJ) is determined from a measured spectral intensity distribution M(S) by using said first spectral calibration data (λ(S).51. The method according to claim 1 , further comprising monitoring the temperature of the etalon ...

Window obscuration sensors for mobile gas and chemical imaging cameras

An infrared (IR) imaging system for determining a concentration of a target species in an object is disclosed. The imaging system can include an optical system including a focal plane array (FPA) unit behind an optical window. The optical system can have components defining at least two optical channels thereof, said at least two optical channels being spatially and spectrally different from one another. Each of the at least two optical channels can be positioned to transfer IR radiation incident on the optical system towards the optical FPA. The system can include a processing unit containing a processor that can be configured to acquire multispectral optical data representing said target species from the IR radiation received at the optical FPA. One or more of the optical channels may be used in detecting objects on or near the optical window, to avoid false detections of said target species.

SHORT PULSEWIDTH REPETITION RATE NANOSECOND TRANSIENT ABSORPTION SPECTROMETER

A high-sensitivity nanosecond to millisecond transient absorption spectrometer for measurements of miniscule signals under low excitation intensities includes an excitation source generating a frequency greater than 100 Hz, pulsewidth less than 5 ns excitation pulse for exciting a light absorbing sample, a probe light source for generating a photon flux probe light beam producing an average irradiance greater than 1 μW mnmfor measuring the transient absorption spectrum of the sample before and after excitation by the excitation source, a DC-coupled detector capable of measuring light for enabling synchronous measurement of both the transmission of the probe light beam and the change in transmission of the probe light beam between a signal with the excitation pulse present and a signal in the absence of the excitation pulse, and a digital oscilloscope with a trigger rearm time capable of collecting every trigger event at high frequencies including 1 MHz, for enabling sequential noise subtraction protocols. 1. A high-sensitivity nanosecond to millisecond transient absorption spectrometer for measurements of miniscule signals under low excitation intensities , comprising:an excitation source generating an excitation pulse for exciting a light absorbing sample;a probe light source generating a probe light beam for measuring a transient absorption spectrum of the sample by monitoring transmission signals of the probe light beam before and after excitation by the excitation pulses;a detector for detecting the transmission signals and a change in the transmission signals of the probe light beam; anda digital oscilloscope for collecting the detected signals; the excitation pulse has a frequency greater than 100 Hz and a pulsewidth less than 5 ns;', {'sup': −2', '−1, 'the probe light beam has a photon flux producing an average irradiance greater than 1 μW mnm'}, 'the detector is a DC-coupled detector operable to measure light for enabling sequential switching of an AC- and ...

MULTI-CHANNEL UP-CONVERSION INFRARED SPECTROMETER AND METHOD OF DETECTING A SPECTRAL DISTRIBUTION OF LIGHT

A multi-channel infrared spectrometer for detecting an infrared spectrum of light received from an object. The spectrometer comprises a wavelength converter system comprising a nonlinear material and having an input side and an output side. The wavelength converter system comprises at least a first up-conversion channel and a second up-conversion channel, and is arranged such that light traversing the wavelength converter system at different angles in the nonlinear material is imaged into different positions in an image plane. The first up-conversion channel is configurable for phase-matching infrared light in a first input wavelength range incident on the first side and light in a first output wavelength range output on the second side, and correspondingly, the second up-conversion channel is configurable for phase-matching infrared light in a second input wavelength range incident on the first side into light in a second output wavelength range output on the second side. The spectrometer further comprises a demultiplexer configured for demultiplexing light in the first up-conversion channel and light in the second up-conversion channel. The demultiplexer is located on the first side or the second side of the wavelength converter system. Finally, the spectrometer comprises a spatially resolved detector arranged in the image plane to detect light in the first output wavelength range and second output wavelength range output of the wavelength converter system. 1. Infrared spectrometer for detecting an infrared spectrum of light received from an object , comprising: the first up-conversion channel being configurable for phase-matching infrared light in a first input wavelength range incident on the first side and light in a first output wavelength range output on the second side, and concurrently,', 'the second up-conversion channel being configurable for phase-matching infrared light in a second input wavelength range incident on the first side into light in a second ...

NOISE REDUCTION APPARATUS AND DETECTION APPARATUS INCLUDING THE SAME

A noise reduction apparatus includes a first delaying/combining unit configured to output first and second pulse light beams, and a second delaying/combining unit configured to branch the first pulse light beam into two pulse light beams to output third and fourth pulse light beams and branch the second pulse light beam into two pulse light beams to output fifth and sixth pulse light beams. 1. A noise reduction apparatus comprising:a first delaying/combining unit configured to branch a pulse light beam of a first period into two pulse light beams, provide a first delay time between the two branched pulse light beams, and combine the two branched pulse light beams, to output a first pulse light beam polarized in a first direction and a second pulse light beam polarized in a direction orthogonal to the first direction and delayed by the first delay time with respect to the first pulse light beam; anda second delaying/combining unit configured to branch the first pulse light beam into two pulse light beams, provide a second delay time between the two branched pulse light beams, combine the two branched pulse light beams, to output a third pulse light beam polarized in a second direction and a fourth pulse light beam polarized in a direction orthogonal to the second direction and delayed by the second delay time with respect to the third pulse light beam, branch the second pulse light beam into two pulse light beams, provide the second delay time between the two branched pulse light beams, and combine the two branched pulse light beams, to output a fifth pulse light beam polarized in the second direction and a sixth pulse light beam polarized in a direction orthogonal to the second direction and delayed by the second delay time with respect to the fifth pulse light beam,wherein a light intensity ratio between the first pulse light beam and the second pulse light beam is 1:1,wherein the light intensity ratio between the third pulse light beam and the fourth pulse light ...

SPECTRAL IMAGING SYSTEM FOR REMOTE AND NONINVASIVE DETECTION OF TARGET SUBSTANCES USING SPECTRAL FILTER ARRAYS AND IMAGE CAPTURE ARRAYS

An approach to noninvasively and remotely detect the presence, location, and/or quantity of a target substance in a scene via a spectral imaging system comprising a spectral filter array and image capture array. For a chosen target substance, a spectral filter array is provided that is sensitive to selected wavelengths characterizing the electromagnetic spectrum of the target substance. Elements of the image capture array are optically aligned with elements of the spectral filter array to simultaneously capture spectrally filtered images. These filtered images identify the spectrum of the target substance. Program instructions analyze the acquired images to compute information about the target substance throughout the scene. A color-coded output image may be displayed on a smartphone or computing device to indicate spatial and quantitative information about the detected target substance. The system desirably includes a library of interchangeable spectral filter arrays, each sensitive to one or more target substances. 125-. (canceled)26. A method of detecting a target substance in a scene , comprising the steps of:a) using an image capture array and a spectral filter array, to simultaneously capture a plurality of spectrally filtered images of the scene, wherein the spectral filter array is sensitive to at least two bandwidth portions of the electromagnetic spectrum which provide spectral information effective to identify the target substance; andb) using the spectrally filtered images to generate an output indicative of the presence and the one or more locations of the target substance in the scene.2732-. (canceled)33. A spectral filter system , comprising a plurality of interchangeable spectral filter arrays , wherein each spectral filter array comprises a plurality of spectral filtering elements , wherein at least one spectral filtering element is pre-associated with both a target substance and at least one background substance , wherein said spectral filtering ...

SYSTEMS AND METHODS FOR CALIBRATION OF A HANDHELD SPECTROMETER

The spectrometer methods and apparatus disclosed herein provide improved accuracy and can better accommodate variability among spectrometer systems and associated components. In many instances one or more of a calibration cover, an accessory, or a spectrometer are each associated with a unique identifier and corresponding calibration data. The calibration data associated with the unique identifiers can be stored in a database used to determine spectral information from measurements of objects obtained with individual spectrometer devices. The spectrum of the object can be determined in response to the unique identifiers and associated calibration data in order to provide improved accuracy and decreased cost. 1. An apparatus to measure a spectrum of an object , the apparatus comprising: receive a unique identifier for an accessory to a spectrometer, and', 'receive spectral data from the spectrometer, and', 'determine the object in response to the spectral data and the unique identifier for the accessory., 'a processor configured with instructions to,'}2. An apparatus as in claim 1 , wherein the processor is configured with instructions to receive a unique identifier for the spectrometer and determine the object in response to the unique identifier for the accessory and the unique identifier for the spectrometer.3. An apparatus as in claim 1 , wherein the processor comprises a remote processor configured to receive one or more of sample measurement data from a measurement of the object claim 1 , a spectrometer ID associated with the sample measurement data claim 1 , corresponding spectrometer calibration data associated with the spectrometer ID claim 1 , cover measurement data claim 1 , a cover ID claim 1 , corresponding cover calibration data associated with the cover ID claim 1 , accessory measurement data claim 1 , an accessory ID claim 1 , or corresponding accessory calibration spectral data associated with the accessory ID.4. An apparatus as in claim 1 , wherein ...

Method, device and apparatus for monitoring halogen levels in a body of water

A method and an apparatus are presented for monitoring a concentration of a specific halogen in a body of water such as a spa or bathing unit for example. The apparatus comprises a housing in which is positioned an optical absorption analyzer for making first and second measurement of transmission of ultraviolet light from a light source emitting light at a specific wavelength. The second and first measurements are taken respectively before and after the ultraviolet light has travelled through a sample of water and are used to derive a concentration of the specific halogen. The derived concentration may then be communicated to a user using a display device and/or may be used to control operational components of a bathing unit for adjusting the concentration of halogen in the water. In some practical implementations, the apparatus may be embodied as a standalone device, which may be configured to float on the water of the bathing unit or, alternatively, may be configured for being installed in-line in a water circulation path of the bathing input by connecting the housing to circulation piping.

A MULTI-ORDER DIFFRACTIVE FRESNEL LENS (MOD-DFL) AND SYSTEMS THAT INCORPORATE THE MOD-DFL

A multi-order diffractive Fresnel lens (MOD-DFL) that is suitable for use in a space telescope for studying transiting earth-like planets of distant stars is provided. The MOD-DFL may comprise a MOD-DFL array comprising a plurality of MOD-DFL segments that are secured to a mounting surface of a deployment device, such as a balloon, for example, in a preselected arrangement to form the MOD-DFL. An array telescope may be formed of an array of deployment devices, such as an array of balloons, for example, each having a MOD-DFL secured to a mounting surface of the respective deployment device, an optics system disposed inside of the respective deployment device, and a camera disposed inside of the respective deployment device. Each MOD-DFL comprises a plurality of MOD-DFL segments arranged in a preselected arrangement to form the respective MOD-DFL. 1. A multi-order diffractive Fresnel lens (MOD-DFL) comprising:an optical substrate having a bottom surface and a top surface; anda surface profile formed in the top surface, the surface profile being radially symmetric relative to a center axis of the MOD DFL, the surface profile comprising N transitions in the top surface at N radial positions, respectively, from the center axis, where N is a positive integer that is greater than or equal to 2, each of the transitions occurring at a respective zone boundary and having a step height in a direction parallel to the center axis.2. The MOD-DFL of claim 1 , wherein the surface profile is a continuous curve from the center axis to a closest of the N transitions to the center axis.3. The MOD-DFL of claim 2 , wherein the continuous curve is aspherical in shape.4. The MOD-DFL of claim 1 , wherein the MOD-DFL is an Morder MOD-DFL claim 1 , where M is a positive integer that is greater than or equal to 250.5. The MOD-DFL of claim 1 , wherein the step height is the same for all of the transitions and is greater than or equal to 0.25 millimeters (mm).6. The MOD-DFL of claim 1 , wherein ...

ABSORPTION SPECTROMETER

In order to reduce a variation in the light amount of light detected in every reference measurement cycle in an absorption spectrometer , it is adapted to tilt at least one surface selected from among incident surfaces and emitting surfaces of all translucent members constituting a reference cell with respect to the light axis of light traveling along a light path. 1. An absorption spectrometer comprising:a light source;a light detector adapted to detect light emitted from the light source;a sample cell adapted to be selectively arrangeable either a sample measurement position positioned in a light path of the light passing between the light source and the light detector or a sample retracted position retracted from the sample measurement position; anda reference cell adapted to be selectively arrangeable either a reference measurement position positioned in the light path of the light passing between the light source and the light detector or a reference retracted position retracted from the reference measurement position, and contain at least one translucent member that transmits the light traveling along the light path from an incident surface to an emitting surface in a state of being arranged in the reference measurement position, whereinat least one surface selected from among the incident surface and the emitting surface of the translucent member constituting the reference cell is tilted with respect to a light axis of the light traveling along the light path.2. The absorption spectrometer according to claim 1 , whereinthe reference cell is adapted to be slidable along a guide bridging between the reference measurement position and the reference retracted position.3. The absorption spectrometer according to claim 1 , whereinat least one pair of surfaces selected from among incident surfaces and emitting surfaces of all translucent members constituting the reference cell is parallel, and the paired surfaces are both tilted with respect to the light axis of the ...

DETECTOR, CORRECTION METHOD AND CALIBRATION METHOD OF DETECTOR, DETECTION APPARATUS AND DETECTION SYSTEM

There is provided a detector, and a method of calibrating or correcting a detection value in a wavelength range within an evaluable range by using a detection value in a wavelength range other than the evaluable range by using the detector. The detector includes an active layer containing a quantum well or quantum dots, and that is capable of sweeping a detection peak wavelength of a detection spectrum in a wavelength range within an evaluable range and a wavelength range other than the evaluable range, and is configured to correct or calibrate a detection value in the wavelength range within the evaluable range using a detection value in the wavelength range other than the evaluable range. 1. A detector comprisingan active layer containing a quantum well or quantum dots,wherein the detector is capable of sweeping a detection peak wavelength of a detection spectrum in a wavelength range within an evaluable range and a wavelength range other than the evaluable range, andwherein the detector is configured to correct or calibrate a detection value in the wavelength range within the evaluable range using a detection value in the wavelength range other than the evaluable range.2. The detector according to claim 1 ,wherein the detector is configured to correct or calibrate the detection value in the wavelength range within the evaluable range by comparing the detection value in the wavelength range other than the evaluable range with a detection value at a time of shipment.3. The detector according to claim 1 ,wherein the detector is configured to extract only a radiation spectrum from a target object by calculating a radiation spectrum from a surrounding object based on the detection value of the wavelength range other than the evaluable range and subtracting the calculated radiation spectrum from the detection spectrum.4. The detector according to claim 1 ,wherein the detector is configured to calculate a temperature by using a two-color thermometry, and calculate a ...

Method for Diagnosing Optical Spectrometers of Downhole Tools

A method for analyzing the condition of a spectrometer is provided. In one embodiment, the method includes acquiring optical data from a spectrometer of a downhole tool during flushing of a flowline and selecting a data set from the acquired optical data. The method can also include estimating light scattering and optical drift for the spectrometer based on the selected data set and determining impacts of the estimated light scattering and optical drift for the spectrometer on measurement accuracy of a characteristic of a downhole fluid determinable through analysis of the downhole fluid using the spectrometer. Additional methods, systems, and devices are also disclosed. 1. A method comprising:acquiring optical data from a spectrometer of a downhole tool during flushing of a flowline of the spectrometer;selecting a data set from the optical data acquired during flushing of the flowline;estimating light scattering and optical drift for the spectrometer based on the selected data set; anddetermining impacts of the estimated light scattering and optical drift for the spectrometer on measurement accuracy of a characteristic of a downhole fluid determinable through analysis of the downhole fluid using the spectrometer.2. The method of claim 1 , comprising diagnosing a condition of the spectrometer based on the determined impacts of the estimated light scattering and optical drift for the spectrometer on measurement accuracy of the characteristic of the downhole fluid.3. The method of claim 2 , wherein diagnosing the condition of the spectrometer includes determining whether the spectrometer is ready for downhole use.4. The method of claim 2 , wherein diagnosing the condition of the spectrometer includes determining whether the determined impacts of the estimated light scattering and optical drift for the spectrometer on measurement accuracy of the characteristic of the downhole fluid fall within desired criteria.5. The method of claim 4 , comprising:determining that the ...

Optical spectrum measurement device

An optical spectrum measurement device includes: a grating spectroscope that disperses an incident light, the grating spectroscope emitting the incident light from a slit; a plurality of photodiode sensors that has mutually different light receiving properties; a movable table on which the plurality of photodiode sensors is placed so as to align on a planar surface perpendicular to a traveling direction of an emitted light from the slit; and a driving mechanism that moves the movable table so as to have a state where the emitted light enters into any of the plurality of photodiode sensors.

Methods and systems for efficient separation of polarized uv light

Methods and systems are provided for separating polarized UV light. In one example, a method may include passing polarized source light through a group of at least four prisms to collimate and separate a second-harmonic generation (SHG) beam from a pump beam. The separated SHG beam may then be further passed through a spatial filter to reduce spatial distribution.

APPARATUS AND METHOD FOR CALIBRATING EXTREME ULTRAVIOLET SPECTROMETER

Provided are an apparatus and method for calibrating an extreme ultraviolet (EUV) spectrometer in which a wavelength of a spectrum of EUV light used for EUV lithography and mask inspection technology can be measured accurately. 1. An apparatus for calibrating an extreme ultraviolet (EUV) spectrometer , comprising:an EUV generation module including a means for generating EUV light by an interaction of laser light and an inert gas in a vacuum chamber and a zirconium (Zr) filter configured to transmit a wavelength of a specific band and block a wavelength band of a femtosecond laser among wavelengths of the generated EUV light; andan EUV spectrometer calibration unit including an optical module having at least one mirror to reflect only a wavelength of a specific band among wavelengths of EUV light transmitted from the Zr filter of the EUV generation module, a diffraction grating configured to separate a wavelength of a specific band of the EUV light reflected from the mirror of the optical module based on wavelengths, a charge-coupled device (CCD) camera configured to capture the EUV light having the wavelength of the specific band separated from the diffraction grating, and a spectrum conversion module configured to convert a pixel of an image captured from the CCD camera into a wavelength so as to obtain a spectrum according to a harmonic generation order of the EUV light.2. The apparatus of claim 1 , further comprisinga control module configured to capture the EUV light output from the diffraction grating through the CCD camera after transmitting the EUV light transmitted from the Zr filter to the diffraction grating in a state in which the optical module is removed, convert a position of the pixel to a wavelength after converting the pixel of the captured image to a wavelength, receiving spectrum information according to a harmonic generation order of the EUV light and matching the received spectrum information with spectrum information obtained through the ...

COMPACT SPECTROMETER

A compact spectrometer includes an excitation light source configured to generate excitation light and arranged to illuminate a spot on a sample. A dispersive element includes at least one movable component and spatially separates output light emanating from the sample in response to the excitation light into a plurality of different wavelength bands. A moveable component of the dispersive element causes the plurality of different wavelength bands of the output light to be scanned across a detector. The detector includes at least one light sensor that senses the wavelength bands of the output light and generates an output electrical signal in response to the sensed output light. 1. A spectrometer , comprising:an excitation light source configured to generate excitation light having at least first and second distinct wavelength bands derived from a single source, the excitation light source arranged to simultaneously illuminate a spot on a sample with the first and the second wavelength bands;a dispersive element comprising at least one movable component, the dispersive element configured to spatially separate output light emanating from the sample in response to the excitation light into a plurality of different wavelength bands, the at least one moveable component configured to scan the plurality of different wavelength bands of the output light across a detector; andthe detector comprising at least one light sensor configured to sense the wavelength bands of the output light and to generate an output electrical signal in response to the sensed output light.2. The spectrometer of claim 1 , wherein an optical path of the device comprises a three dimensional (3D) folded geometric light path claim 1 , the 3D folded geometric light path comprising a first portion lying in a first plane and including a first bend and a second portion lying in a different claim 1 , second plane and including a second bend.3. The spectrometer of claim 1 , wherein:the excitation light ...

Automated Delay Line Alignment

A system and method for pre-aligning a light beam in a spectroscopic measuring device such as a pump-probe device prior to conducting a measurement procedure is provided, which eliminates the need for monitoring or modification of the beam trajectory through adjustments of elements transmitting the beam (e.g., mirrors) over the course of a measurement process.

SPECTROMETRY SYSTEM APPLICATIONS

A system for analyzing body fat level in human body comprising: a spectrometer, for example a handheld spectrometer, configured to generate spectral data from one or more locations on the body of a tested subject and a processor configured to receive the spectral data using models and output body fat levels of the tested subject. 1. A method for determining a body fat level of a subject , the method comprising:receiving spectral data associated with the subject, said spectral data corresponding to light from tissue of the subject at a plurality of wavelengths of light;inputting the spectral data into a body fat model; anddetermining the body fat level of the subject in response to the spectral data of the subject input into the body fat model.2. The method of claim 1 , wherein the body fat model receives as input a reference body fat measurement of the subject from a non-optical reference measurement system and first spectral data measured with a hand held spectrometer within a day of the reference measurement claim 1 , and wherein second spectral data measured from the hand held spectrometer after the first spectral data are input into the model to determine the body fat level.3. The method of claim 2 , wherein the body fat level of the subject is determined over a range of body fat levels from about 7% to about 54% from the second measurement with accuracy better than 5% for at least one month after the reference measurement.4. The method of claim 2 , wherein the body fat level of the subject is determined over a range of body fat levels from about 7% to about 54% from the second measurement with accuracy better than 2.5% for at least one month after the reference measurement.5. The method of claim 2 , wherein the body fat level of the subject is determined over a range of body fat levels from about 7% to about 54% from the second measurement with accuracy better than 1% for at least one month after the reference measurement.6. The method of claim 1 , wherein the ...

SPECTRAL COLORIMETRY APPARATUS AND IMAGE FORMING APPARATUS TO CONTROL THE NUMBER OF DETECTION TIMES

The spectral colorimetry apparatus includes an LED, a diffraction grating; a line sensor that has multiple pixels and that receives light dispersed by the diffraction grating at the multiple pixels for respective wavelengths of the dispersed light and outputs voltages according to the intensity of the received light; and a sensor CPU that calculates spectral reflectivity of an object based on the intensity of light reflected from the object. The sensor CPU varies, with the multiple pixels, the number of detection times of detecting the light reflected from the object at each pixel. 1. A spectral colorimetry apparatus comprising:a light source configured to emit light to an object;a spectral unit configured to disperse the light reflected from the object;a line sensor having pixels, the line sensor configured to receive the light dispersed by the spectral unit at the pixels for respective wavelengths to output a voltage according to intensity of the light received; anda control unit configured to calculate spectral reflectivity of the object based on the intensity of the light reflected from the object,wherein the control unit performs control to vary a number of detection times to detect the object per pixels.2. A spectral colorimetry apparatus according to claim 1 , comprising a reference plate for calibrating output from the line sensor claim 1 ,wherein the control unit calculating the spectral reflectivity of the object based on intensity of light reflected from the reference plate and the intensity of the light reflected from the object.3. A spectral colorimetry apparatus according to claim 2 , wherein the control unit determines the number of detection times based on a result of detecting the light reflected from the reference plate at the pixels.4. A spectral colorimetry apparatus according to claim 2 , wherein the control unit performs the control to control numbers of detection times at the pixels so that a number of detection times at each of pixels ...

RADIATION MEASURING SYSTEMS AND METHODS THEREOF

A radiation measuring device for measuring electromagnetic radiation originating from an external source. The radiation measuring device includes, a spectrometer, a pyranometer, a pyrgeometer, a diffuser, and a control unit. The spectrometer and a pyranometer are positioned in a sensor zone of a housing of the radiation measuring device. The spectrometer measures visible shortwave radiation and near-infrared shortwave radiation received at the sensor zone. The pyranometer measures shortwave radiation received at the sensor zone. The pyrgeometer is positioned in another sensor zone of the housing and measures longwave radiation received at the other sensor zone. The control unit receives radiation measurements from the spectrometer, pyranometer, and pyrgeometer. A corrected amount of radiation received at the sensor zones of the radiation measuring device is determined from the received radiation measurements. Other embodiments are described and claimed. 1. A radiation measuring device , comprising:a housing;a spectrometer coupled to the housing;a pyranometer coupled to the housing, wherein the pyranometer is adjacently positioned to the spectrometer;a first diffuser covering the spectrometer and the pyranometer, the first diffuser configured to scatter the visible shortwave radiation and the near-infrared shortwave radiation;a pyrgeometer coupled to the housing;a second diffuser covering the pyrgeometer, the second diffuser is different from the first diffuser; anda control unit electrically coupled to the spectrometer, the pyranometer, and the pyrgeometer, the control unit configured to receive measurements from the spectrometer, the pyranometer, and the pyrgeometer.2. The radiation measuring device of claim 1 , whereinthe spectrometer is configured to measure visible shortwave radiation and near-infrared shortwave radiation;the pyranometer is configured to measure shortwave radiation; andthe pyrgeometer is configured to measure longwave radiation.3. The radiation ...

HYPER-SPECTRAL IMAGE MEASUREMENT DEVICE AND CALIBRATION METHOD THEREFOR, PHOTOGRAPHING MODULE AND DEVICE FOR SKIN DIAGNOSIS, SKIN DIAGNOSIS METHOD, AND SKIN IMAGE PROCESSING METHOD

In one aspect, a hyperspectral image measurement device is provided to include: a main body; an illumination module disposed in the main body and including LEDs having different peak wavelengths to irradiate light to a subject; a camera disposed on the main body and receiving light reflected from the subject to acquire an image of the subject; a barrel having a contact surface contacting the subject, the contact surface located to be spaced apart from the illumination module and the camera module by a predetermined distance; and a reference cover located on the contact surface and including a standard reflection layer for reflecting light irradiated from the illumination module toward the camera module. 1. A measurement device for a biological tissue , comprising:a light emitting device configured to irradiate a first light having a first wavelength to a biological tissue, wherein the biological tissue is configured to reflect a portion of the first light and emit a second light having a second wavelength;a filter disposed to receive the portion of the first light and the second light from the biological tissue and configured to block the portion of the first light and pass the second light; anda sensor disposed to receive the second light from the filter and configured to detect the second light,wherein the first wavelength is a wavelength at which a predetermined substance in the biological tissue has a high absorption rate,wherein the second wavelength is a wavelength at which the predetermined substance fluoresces and has a longer wavelength than the first wavelength,wherein the sensor includes at least one of a blue light sensing element, a green light sensing element, or a red light sensing element.2. The measurement device of claim 1 , wherein the first light has a peak wavelength that is less than 420 nm.3. The device of claim 1 , wherein the filter is disposed to be closer to the sensor than the light emitting device.4. The device of claim 1 , wherein the ...

HIGH-SPEED FOURIER-TRANSFORM SPECTROSCOPY APPARATUS AND SPECTROSCOPY METHOD

In a Fourier-transform spectroscopy apparatus, a scanning mirror is arranged on a light path of scanning light. The scanning mirror delays or advances the scanning light with respect to reference light according to the rotational angle of the scanning mirror from its initial position. A spectroscopic spectrum generating unit generates an interferogram based on the intensity of the detection target light obtained from the detection target, and Fourier transforms the interferogram thus generated. The spectroscopic spectrum generating unit corrects the nonlinearity of the group delay between an envelope of the reference light and an envelope of the scanning light, and corrects the nonlinearity of the phase shift between the respective envelopes. 1. A Fourier-transform spectroscopy apparatus comprising:an interferometer comprising a beam splitter structured to split light emitted from a light source into reference light and scanning light, a first arm structured to reflect the reference light by a first mirror such that it is re-input to the beam splitter, and a second arm structured to reflect the scanning light by a second mirror such that it is re-input to the beam splitter, wherein the interferometer is structured to combine the reference light and the scanning light re-input to the beam splitter so as to generate an interference wave; anda spectroscopic spectrum generating unit structured to generate an interferogram based on an intensity of detection light obtained from a detection target after either light emitted from the light source or the interference wave thus combined is irradiated to the detection target, and to apply a Fourier transform to the interferogram,wherein the second arm is configured such that a scanning mirror is arranged on a light path of the scanning light between the beam splitter and the second mirror so as to delay or advance the scanning light with respect to the reference light according to a rotational angle of the scanning mirror,and ...

SPECTRAL PROPERTIES-BASED SYSTEM AND METHOD FOR FEEDING MASTERBATCHES INTO A PLASTIC PROCESSING MACHINE

Disclosed is a system for optimizing a match between the color of an in-line part manufactured by a plastic product production machine and the color of a reference part by adjusting the concentration of masterbatch in the mixture of raw material fed to the plastic product production machine. The optimization of the color is based on interlaced spectra of the in-line part and reference part obtained using the same spectrometer, thereby eliminating the requirement for high accuracy spectrometer calibration and allowing a controller of the system to determine the rates at which the base masterbatches are added to the raw material in real time on the manufacturing floor while the plastic product production machine is being operated to manufacture in-line parts. 1. A system for optimizing a match between the color of an in-line part manufactured by a plastic product production machine and the color of a reference part by adjusting the concentration of masterbatch in a mixture of raw material fed to the plastic product production machine , the system comprising:a) two illumination light sources;b) two measuring heads;c) one spectrometer;d) a spectrum processing and illumination control unit;e) at least one mechanism configured to add masterbatch to the mixture of raw material fed to the plastic product production machine; andf) at least one controller configured to control the rate at which the mechanism adds masterbatch to the mixture;wherein: i) activate the spectrometer;', 'ii) activate the two illumination light sources and the two measuring heads intermittently to enable interlaced measurement of the reference sample spectra and the in-line part spectra;', 'iii) measure the spectrum of the in-line part received from the spectrometer;', 'iv) measure the spectrum of the reference part received from the spectrometer;', 'v) determine the color coordinates of the in-line part and the reference part from the measured spectra;', 'vi) determine the color coordinates of a set ...