СПОСОБ ДИНАМИЧЕСКОГО КОНТРОЛЯ ВНУТРЕННИХ ПАРАМЕТРОВ СИСТЕМ ЭЛЕКТРОДВИГАТЕЛЯ

FIELD: electrical engineering. SUBSTANCE: proposed method designed for measurement and dynamic check of respective variables of motor, such as temperature and vibration, involves use of fiber-optic cable 5 embedded in motor insulation 4 and at least one motor winding wire 3; such cable 5 actually forms stretched thermometer and/or vibration transducer. EFFECT: facilitated procedure and enhanced reliability of check results. 5 cl, 3 dwg ÐÎÑÑÈÉÑÊÀß ÔÅÄÅÐÀÖÈß (19) RU (51) ÌÏÊ 7 (11) (13) 2 246 166 C2 H 02 K 15/00, G 01 R 31/34 ÔÅÄÅÐÀËÜÍÀß ÑËÓÆÁÀ ÏÎ ÈÍÒÅËËÅÊÒÓÀËÜÍÎÉ ÑÎÁÑÒÂÅÍÍÎÑÒÈ, ÏÀÒÅÍÒÀÌ È ÒÎÂÀÐÍÛÌ ÇÍÀÊÀÌ (12) ÎÏÈÑÀÍÈÅ ÈÇÎÁÐÅÒÅÍÈß Ê ÏÀÒÅÍÒÓ (21), (22) Çà âêà: 2001128662/09, 23.03.2000 (72) Àâòîð(û): ÑÌÈÒ Äåéâèä Ðàíäîëô (NL) (24) Äàòà íà÷àëà äåéñòâè ïàòåíòà: 23.03.2000 (73) Ïàòåíòîîáëàäàòåëü(ëè): ØÅËË ÈÍÒÅÐÍÝØÍË ÐÈÑÅÐ× ÌÀÀÒÑÕÀÏÏÈÉ Á.Â. (NL) (30) Ïðèîðèòåò: 24.03.1999 US 60/125,857 R U (43) Äàòà ïóáëèêàöèè çà âêè: 20.07.2003 (45) Îïóáëèêîâàíî: 10.02.2005 Áþë. ¹ 4 2 2 4 6 1 6 6 (56) Ñïèñîê äîêóìåíòîâ, öèòèðîâàííûõ â îò÷åòå î ïîèñêå: US 4827487 À, 02.05.1989. RU 2068553 Ñ1, 27.10.1996. SU 1213244 À1, 23.02.1986. SU 851661 À1, 30.07.1981. SU 888288 À1, 07.12.1981. DE 29503853 U, 01.06.1995. US 4901070 À, 13.02.1990. (85) Äàòà ïåðåâîäà çà âêè PCT íà íàöèîíàëüíóþ ôàçó: 24.10.2001 2 2 4 6 1 6 6 R U (87) Ïóáëèêàöè PCT: WO 00/57540 (28.09.2000) C 2 C 2 (86) Çà âêà PCT: EP 00/02669 (23.03.2000) Àäðåñ äë ïåðåïèñêè: 103735, Ìîñêâà, óë.Èëüèíêà, 5/2, ÎÎÎ"Ñîþçïàòåíò", Ë.È.ßòðîâîé (54) ÑÏÎÑÎÁ ÄÈÍÀÌÈ×ÅÑÊÎÃÎ ÊÎÍÒÐÎËß ÂÍÓÒÐÅÍÍÈÕ ÏÀÐÀÌÅÒÐΠÑÈÑÒÅÌ ÝËÅÊÒÐÎÄÂÈÃÀÒÅËß (57) Ðåôåðàò: Èçîáðåòåíèå îòíîñèòñ ê îáëàñòè ýëåêòðîòåõíèêè è ïðåäíàçíà÷åíî äë ïðîâåäåíè èçìåðåíèé è îñóùåñòâëåíè äèíàìè÷åñêîãî êîíòðîë ñîîòâåòñòâóþùèõ äàííûõ, ê ïðèìåðó, òàêèõ, êàê òåìïåðàòóðà è âèáðàöè , â ýëåêòðîäâèãàòåëå. Ñóùíîñòü èçîáðåòåíè ñîñòîèò â òîì, ÷òî îíî ïðåäóñìàòðèâàåò èñïîëüçîâàíèå âîëîêîííî-îïòè÷åñêîãî êàáåë (5), çàäåëàííîãî â ýëåêòðîèçîë öèþ (4), ïî ìåíüøåé ìåðå, îäíîãî ïðîâîäà (3) îáìîòîê ýëåêòðîäâèãàòåë , ...

ОПТИЧЕСКИЙ СЕНСОРНЫЙ КАБЕЛЬ

Изобретение относится к измерительной технике и может быть использовано в качестве оптического сенсорного кабеля для проведения измерений температурного распределения по скважине при добыче нефти и газа. Оптический сенсорный кабель содержит защитную оболочку в виде внешней и по меньшей мере одной внутренней герметичных металлических трубок, расположенных коаксиально. При этом внутри центральной внутренней герметичной металлической трубки вдоль длины всего кабеля свободно уложено по меньшей мере одно оптическое волокно, выполненное с металлическим покрытием. При этом центральная внутренняя герметичная трубка заполнена металлическим расплавом, сохраняющим жидкое состояние в диапазоне температур эксплуатации кабеля. Технический результат состоит в повышении стойкости оптического сенсорного кабеля, обеспечении предотвращения выброса по металлической трубке с волокном в случае потери герметичности трубки и увеличении температурного диапазона эксплуатации оптического сенсорного кабеля. 6 з.п.

Distributed temperature sensor with differential loss correction

A distributed temperature sensor 400 for use in a wellbore, in which a light signal at a first frequency is injected into a waveguide 120 and backscattered Raman Stokes and Raman anti-Stokes signals are detected, and further light signals at second and third frequencies (which may be respectively at or near to the Raman Stokes and anti-Stokes frequencies of the signal at the first frequency) are injected into the waveguide. Backscattered signals based on the further light signals are detected and used to compensate a distributed temperature sensor profile of the waveguide for differential and/or varying waveguide losses between Raman Stokes and anti-Stokes frequencies.

Optical fiber temperature sensing system having a deformable shape memory alloy

A temperature sensing system comprises: an optical waveguide 102; a shape memory alloy (SMA) element 106a, and an interrogator. The SMA element 106a is deformable as a function of temperature and at least partially surrounds the optical waveguide 102. The interrogator 12 is configured to detect distributed temperature along the optical waveguide 102 using spectroscopy, and to detect strain in the optical waveguide 102 induced by deformation of the SMA element 106a to identify local hot spots along the optical waveguide 102. The SMA element may comprise a tube, coil or spring of SMA material surrounding at least a section of the optical waveguide. The SMA element may be configured to deform, constrict, bend, or kink at a temperature equal to a local overheat temperature alarm threshold. The temperature sensing system is particularly suited to heat and fire detection.

Distributed optical fiber identification system and method for seepage conditions of hydraulic structure and base thereof

Filtering distributed sensing data

STATIC ELECTRIC INDUCTION APPARATUS COMPRISING A WINDING AND A SENSOR SYSTEM FOR MONITORING THE TEMPERATURE IN THE WINDING

The present invention relates to a static electric induction apparatus (1b) comprising a winding (2) including a plurality of winding units (3), at least one first spacer element (5) arranged between the winding units (3) and including a first groove (18) defined in the surface thereof, and a sensor system for monitoring the temperature in the apparatus, wherein the sensor system comprises an elongated and flexible temperature sensing element (16) disposed in the first groove.The first groove (18) has a curved part that receives the flexible temperature sensing element which is wound at least one revolution in the first groove (18). The first groove enters and exits the first spacer element in one and the same end of the first spacer element. The apparatus comprises an elongated second spacer element (14a) extending in an axial direction on the outside of the winding (2). The second spacer element (14a) comprises an elongated second groove (22) arranged in communication with the first groove ...

TAILOR DISTRIBUTED AMPLIFICATION FOR FIBER SENSING

A method of providing in-line Raman amplification in an optical fiber sensing system, including the procedures of generating a probe light having a probe wavelength, transmitting the probe light into an optical fiber, generating at least one Raman pump light at a respective pump wavelength, the pump wavelength being shorter than the probe wavelength, generating at least one Raman seed light at a respective seed wavelength, the seed wavelength being between the pump and probe wavelengths, transmitting the Raman pump light into the optical fiber, transmitting the Raman seed light into the optical fiber and propagating the Raman pump light, the Raman seed light and the probe light along the optical fiber to achieve distributed Raman amplification of signal light produced by the probe light as it propagates along the optical fiber.

DETERMINATION DEVICE, DETERMINATION METHOD, AND DETERMINATION PROGRAM

A determination device equipped with: a model creation unit that creates a standard model of a sensor detection value; a determination unit that determines whether the time from a prescribed point in time until the deviation between the standard model and the sensor detection value exceeds a threshold value is shorter than a prescribed time; and an output unit that outputs a signal associated with an abnormality when the time is determined to be shorter.

Distributed environmental fiber optic sensor and system

A fiber optic sensor for use in environments containing darkening agents, e.g., hydrogen. The sensor includes a multicore fiber or a fiber optic cable containing a number of optical signal paths. Each path includes a sensing core segment and one or more transmission core segments. The sensing core segment is configured to (i) produce optical perturbation signals (e.g., Raman or Rayleigh) at one or more locations along the segment, the perturbation signals corresponding to environmental conditions (e.g., temperature) sensed by the segment at a corresponding location, and (ii) allow the perturbation signals to be detected by measurement equipment coupled to the sensor when light signals from a given source excite the path. The transmission core segments in a selected path subject the perturbation signals to little if any further attenuation relative to the attenuation induced in the sensing core segments in reaction to the darkening agents.

SINGLE-BAND DISTRIBUTED TEMPERATURE SENSING

In some examples, a temperature distribution sensor may include a laser source to emit a laser beam that is tunable over a wavelength range. The wavelength range may be less than a Raman bandwidth in a device under test (DUT), or of-the-order-of the Raman bandwidth in the DUT. A pulsed source may apply a pulse drive signal to the laser beam or to a modulator to modulate the laser beam that is to be injected into the DUT. A bandpass filter may be operatively disposed between the laser source and the DUT, and may be configured to an anti-Stokes wavelength that is narrower than the Raman bandwidth. A photodiode may be operatively disposed between the bandpass filter and the DUT to acquire, from the DUT, anti-Stokes optical time-domain reflectometer traces for two preset wavelengths of the laser beam to determine a temperature distribution for the DUT. 1. A temperature distribution sensor comprising: 'less than a Raman bandwidth in a device under test (DUT), or of-the-order-of the Raman bandwidth in the DUT;', 'a laser source to emit a laser beam that is tunable over a wavelength range, wherein the wavelength range is'}a pulsed source to apply a pulse drive signal to the laser beam or to a modulator to modulate the laser beam that is to be injected into the DUT;a bandpass filter that is operatively disposed between the laser source and the DUT, wherein the bandpass filter is configured to an anti-Stokes wavelength that is narrower than the Raman bandwidth; anda photodiode that is operatively disposed between the bandpass filter and the DUT to acquire, from the DUT, anti-Stokes optical time-domain reflectometer traces for two preset wavelengths of the laser beam to determine a temperature distribution for the DUT.2. The temperature distribution sensor according to claim 1 , wherein the DUT includes an optical fiber.3. The temperature distribution sensor according to claim 1 , further comprising:a fiber amplifier to amplify the pulse drive signal applied to the laser beam ...

ОПТИЧЕСКИЙ СЕНСОРНЫЙ КАБЕЛЬ

Изобретение относится к измерительной технике и может быть использовано в качестве оптического сенсорного кабеля для проведения измерений температурного распределения по скважине при добыче нефти и газа. Оптический сенсорный кабель содержит защитную оболочку в виде внешней и по меньшей мере одной внутренней герметичных металлических трубок, расположенных коаксиально. При этом внутри центральной внутренней герметичной металлической трубки вдоль длины всего кабеля свободно уложено по меньшей мере одно оптическое волокно, выполненное с металлическим покрытием. При этом центральная внутренняя герметичная трубка заполнена металлическим расплавом, сохраняющим жидкое состояние в диапазоне температур эксплуатации кабеля. Технический результат состоит в повышении стойкости оптического сенсорного кабеля, обеспечении предотвращения выброса по металлической трубке с волокном в случае потери герметичности трубки и увеличении температурного диапазона эксплуатации оптического сенсорного кабеля. 6 з.п.

Corrected dts measurements based on raman-stokes signals

Filtering distributed sensing data

Measurement of temperature using combination of rayleigh and raman backscatter interferometry

Hydraulic structure and system and method for indentifying distributed optical fiber for base seepage condition thereof

MEASUREMENT OF TEMPERATURE USING COMBINATION OF RAYLEIGH AND RAMAN BACKSCATTER INTERFEROMETRY

A method of measuring temperatures, includes disposing a carrier in a borehole in an earth formation, the carrier having an optical fiber connected thereto, interrogating the optical fiber with a pulsed optical signal generated by a distributed temperature sensing (DTS) assembly, the pulsed optical signal having a first frequency, and receiving first reflected signals from the optical fiber, estimating an absolute temperature from the reflected signals, interrogating the optical fiber with an at least partially coherent optical signal from a phase sensitive optical time domain reflectometry (?-OTDR) assembly, the at least partially coherent optical signal having a second frequency, and receiving second reflected signals from multiple scattering locations in the optical fiber; estimating a phase difference between the reflected signals, and estimating a temperature change based on the phase difference, and combining the absolute temperature and the temperature change to generate a temperature ...

APPLICATION OF DEPTH DERIVATIVE OF DISTRIBUTED TEMPERATURE SURVEY (DTS) TO IDENTIFY FLUID LEVEL AS A TOOL OF DOWN HOLE PRESSURE CONTROL

A method for using the depth derivative of distributed temperature sensing data to identify fluid levels as a tool of downhole pressure control comprises providing a fiber optic based distributed temperature sensing measurement system through a production region; gathering the temperatures through the production region as a function of the depth in the subsurface well and as a function of the elapsed time; calculating from the gathered data the depth derivative of the temperature changes as a function of depth in the subsurface well and of the elapsed time; and displaying the depth derivative data for analysis of the fluid levels to identify fluid levels.

HIGH SAMPLING RESOLUTION DTS SYSTEM AND METHOD

A method of improving sampling resolution in a distributed temperature measurement system using a fiber optic distributed sensor by means of programmed delayed trigger signals to a laser light source in order to improve the spatial resolution of such systems.

HIGH SAMPLING RESOLUTION DTS SYSTEM AND METHOD

A method of improving sampling resolution in a distributed temperature measurement system using a fiber optic distributed sensor by means of programmed delayed trigger signals to a laser light source in order to improve the spatial resolution of such systems.

TEMPERATURE MEASUREMENT SYSTEM AND ABNORMALITY DETECTION METHOD

To provide an temperature measurement system and an abnormality detection method which are capable of detecting abnormality at an early stage, the abnormality occurring in a facility such as a chemical plant, an oil refinery plant, or a thermal power plant. [Solving Means] A temperature measurement system includes an optical fiber 30, a temperature distribution measurement apparatus 31, and a data processing apparatus 32. The temperature distribution measurement apparatus 31 is configured to detect backscattered light by causing light to enter the optical fiber 30, and acquire the temperature distribution of the optical fiber 30 in the length direction thereof based on the result of the detection. The data processing apparatus 32 is configured to store therein the temperature distribution acquired by the temperature distribution measurement apparatus 31, perform signal processing on a difference temperature distribution obtained by computing the difference between a current temperature distribution and a past temperature distribution, and determine whether or not abnormality is present based on the result of the signal processing.

LOSS COMPENSATION FOR DISTRIBUTED SENSING IN DOWNHOLE ENVIRONMENTS

An apparatus for estimating a parameter includes: an optical fiber sensor including at least one optical fiber configured to be disposed in a downhole location and including at least one sensing location configured to generate measurement signals; at least one light source configured to transmit a measurement signal having a wavelength to interrogate a sensing location and cause the sensing location to return a reflected measurement signal indicative of a measured parameter, and configured to transmit a reference signal and cause a reflected reference signal to be returned from a location associated with the sensing location, the reflected reference signal having a known relationship to hydrogen concentration; and a processor configured to receive the reflected measurement signal and the reflected reference signal, estimate the hydrogen concentration based on the reflected reference signal, and calibrate the first reflected signal based on the estimated hydrogen concentration.

METHOD FOR MONITORING THE THERMOMECHANICAL BEHAVIOR OF A SUBMARINE PIPELINE FOR TRANSPORTATION OF FLUIDS UNDER PRESSURE

L'invention concerne un procédé de surveillance du comportement thermomécanique d'une conduite sous-marine (2) de transport de fluides sous pression réalisée par assemblage d'éléments unitaires de conduite (4), le procédé comprenant une étape d'étalonnage mécanique consistant, à l'aide d'un câble de mesure (16) muni d'un capteur à fibre optique utilisant la rétrodiffusion de Brillouin, à mesurer les déformations subies par chaque élément unitaire de conduite lorsqu'il est soumis à terre à différentes sollicitations mécaniques de directions et d'intensités prédéterminées, et, à partir de ces mesures, à établir une signature mécanique de chaque élément unitaire de conduite, une étape d'étalonnage thermique consistant à mesurer les évolutions de températures de chaque élément unitaire de conduite lorsqu'il est soumis à terre à différentes puissances électriques de chauffe, et, à partir de ces mesures, à établir une signature thermique de chaque élément unitaire de conduite, et une étape de surveillance consistant à récupérer les variations du signal optique injecté dans les capteurs lorsque la conduite est en service, et, à partir des variations du signal et des signatures mécanique et thermique, à déterminer les déformations subies par chaque élément unitaire de conduite. The invention relates to a method for monitoring the thermomechanical behavior of a subsea pipeline (2) for transporting pressurized fluids by assembling unitary pipe elements (4), the method comprising a step of mechanical calibration consisting of using a measuring cable (16) equipped with an optical fiber sensor using Brillouin backscattering, to measure the deformations experienced by each unitary conductor element when subjected to different mechanical stresses predetermined directions and intensities, and from these measurements, to establish a mechanical signature of each unitary driving element, a thermal calibration step of measuring the ...

Low profile, high temperature, hydrogen tolerant optical sensing cable

A sensing cable has a sensing fiber assembly, which includes a pair of sensing fibers joined by a turnaround section with a modal filter, at a terminating end of the sensing fibers. The sensing cable also includes an inner sleeve that surrounds the sensing fiber assembly and an armored casing that caps the terminating end of the inner sleeve. The sensing cable has a low profile and its components are each made of high temperature and hydrogen tolerant materials and are capable of prolonged operation at high temperatures, such as up to 300° C., in hydrogen environments over long lengths of fiber. A distributed thermal sensing (DTS) interrogator is connected to the sensing cable and performs DTS measuring according to protocols and algorithms that leverage the modal filter of the turnaround section to calculate temperature readings along the sensing fiber assembly.

ОПТИЧЕСКИЙ СЕНСОРНЫЙ КАБЕЛЬ

Полезная модель относится к измерительной технике и может быть использована в качестве оптического сенсорного кабеля для проведения измерений температурного распределения по скважине при добыче нефти и газа. Технический результат состоит в обеспечении функционирования оптического сенсорного кабеля в условиях проведения высокотемпературных до 600°С геофизических исследований и мониторинга окислительных процессов в скважинах. Для этого оптический сенсорный кабель содержит герметичную трубку из нержавеющей стали, заполненную наполнителем, и свободно уложенное в трубке оптическое волокно, выполненное с металлическим покрытием, при этом в качестве наполнителя трубка содержит металлический расплав, сохраняющий жидкое состояние в диапазоне температур эксплуатации кабеля. 3 з.п. ф-лы, 1 ил.

Способ создания управляемого субволнового температурного профиля и плазмонная метаповерхность для реализации способа

Изобретение относится к области термоплазмоники. Сущностью заявленного технического решения является способ создания управляемого субволнового температурного профиля, заключающийся в том, что берут плазмонную метаповерхность, подают на нее непрерывное лазерное излучение, под действием которого плазмонные наноструктуры генерируют тепло и упорядоченный массив вокселей А:В плазмонной метаповерхности становится системой точечно распределенных источников тепла на наномасштабе. При этом максимальное значение температуры нагрева вокселей А:В задается высотой наноструктуры В, а интенсивность лазерного излучения позволяет управлять температурой в задаваемом высотой наноструктуры В диапазоне рабочих температур. При этом температура нагрева вокселей А:В определяется балансом между мощностью, поглощенной плазмонными наноструктурами А под действием лазерного излучения, и механизмом теплопроводности с окружающей средой. При этом под действием непрерывного лазерного излучения на поверхности плазмонной ...

Система и способ коррекции искажений сигнала оптического излучения

Изобретение относится к области измерительной техники и может быть использовано в средствах для распределенного измерения температуры, а также для измерения температурного распределения вдоль оптоволоконного кабеля в протяженных объектах, применяемых в сферах, связанных с безопасностью. Техническим результатом является повышение точности и достоверности измерений, производимых при помощи оптического излучения за счет эффективного удаления искажений и шумов в полученном сигнале оптического излучения. Упомянутый технический результат достигается применением рэлеевской компоненты Рамановского рассеяния для оценки степени деградации оптоволокна, вычислением искажений на основе оценки степени деградации оптоволокна, использованием оптических и цифровых каналов для измерения в количестве равном количеству измеряемых компонент. 2 н. и 17 з.п. ф-лы, 3 ил.

Corrected DTS measurements based on raman-stokes signals

Abnormality detection system and abnormality detection method

... [Problem] To provide an abnormality detection system and abnormality detection method capable of detecting, at an initial stage, an abnormality occurring at a facility such as a chemical plant, oil refinery or mill, or thermal power plant. [Solution] An abnormality detection system has an optical fiber (26), a backscattered light detector (20), and a data processing unit (30). The backscattered light detector (20) is connected to one end side and another end side of the optical fiber (26), irradiates light into the optical fiber (26) from the one end side to acquire a first backscattered light intensity distribution, and irradiates light into the optical fiber (26) from the other end side to acquire a second backscattered light intensity distribution. The data processing unit (30) uses the first intensity distribution, the second intensity distribution, and a standardization function to calculate the transmission loss at each position in the length direction of the optical fiber (26) and ...

ATTENUATION CORRECTION FOR DISTRIBUTED TEMPERATURE SENSORS USING ANTISTOKES TO RAYLEIGH RATIO

A distributed temperature sensor, a method of determining temperature, and a processing system to compute temperature are described. The sensor includes an optical fiber disposed in an area where temperature is to be measured, a primary light source to inject light into the optical fiber, and a secondary light source to inject light into the optical fiber. The sensor additionally includes a photo detector to detect backscatter light energy from the optical fiber the backscatter light energy including Stokes Raman scatter or anti-Stokes Raman scatter and primary Rayleigh scatter resulting from the primary light source and secondary Rayleigh scatter resulting from the secondary light source, and a processor to determine temperature based on a ratio of the Stokes Raman scatter or the anti-Stokes Raman scatter and a combination of the primary Rayleigh scatter and the secondary Rayleigh scatter.

Single-band distributed temperature sensing

In some examples, a temperature distribution sensor may include a laser source to emit a laser beam that is tunable over a wavelength range. The wavelength range may be less than a Raman bandwidth in a device under test (DUT), or of-the-order-of the Raman bandwidth in the DUT. A pulsed source may apply a pulse drive signal to the laser beam or to a modulator to modulate the laser beam that is to be injected into the DUT. A bandpass filter may be operatively disposed between the laser source and the DUT, and may be configured to an anti-Stokes wavelength that is narrower than the Raman bandwidth. A photodiode may be operatively disposed between the bandpass filter and the DUT to acquire, from the DUT, anti-Stokes optical time-domain reflectometer traces for two preset wavelengths of the laser beam to determine a temperature distribution for the DUT.

СПОСОБ АВТОМАТИЗИРОВАННОГО УЛЬТРАЗВУКОВОГО ТЕРМООПТИЧЕСКОГО НЕРАЗРУШАЮЩЕГО КОНТРОЛЯ КОМПОЗИТНЫХ МАТЕРИАЛОВ В ТРУДНОДОСТУПНЫХ ЗОНАХ И УСТРОЙСТВО ДЛЯ ЕГО ОСУЩЕСТВЛЕНИЯ

Изобретения относятся к области измерительной техники и могут быть использованы для оценки надежности сложных пространственных конструкций из полимерных композиционных материалов. Способ автоматизированного ультразвукового термооптического неразрушающего контроля изделий из композитных материалов включает ультразвуковое возбуждение температурного поля в области дефекта, регистрацию температурного поля и выявление дефектных областей путем сравнения величины температурного поля с пороговым уровнем. Перед проведением контроля волоконно-оптические датчики регистрации температуры интегрируют в композитный материал на расстоянии друг от друга, не превышающем расстояние растекания теплового фронта в материале от дефекта. Далее осуществляют непрерывное перемещение источника ультразвукового возбуждения температурного поля вдоль расположения волоконно-оптических датчиков. Последовательно регистрируют величину температуры с волоконно-оптических датчиков. Сравнивают величины температур с пороговым ...

DTS performance improvement through variable mode path length averaging

A system and method to determine temperature include an optical fiber and at least two pulse laser sources to transmit light pulses with at least two wavelengths into the optical fiber. The system also includes an optical path length modulator to modulate the optical path length of the optical fiber as the light pulses are transmitted into the optical fiber. At least two photodetectors detect backscatter reflected in the optical fiber, and a processor determines the temperature based on the backscatter.

Distributed sensing in a well

Measuring temperature in a diffusely scattering sample

A method of measuring temperature in a sub-surface volume of a diffusely scattering sample comprises directing probe light into an entry region 14 on the surface and collecting said probe light from a collection region 16 in the sample surface following diffuse scattering within the sub-surface volume of the sample. The collection region is spatially offset from the entry region by an offset in the range 1 mm to 50 mm. The method further comprises detecting one or more Raman spectral features 32 in the collected probe light and determining a temperature of the sub-surface volume from the one or more Raman spectral features. Determining a temperature of the sub-surface volume from the one or more Raman spectral features may comprise using ratios of Stokes and anti-Stokes features in the Raman spectral features. Determining a temperature may also comprise determining a temperature of a particular chemical component present in the sub-surface volume. The method may comprise detecting spectral ...

Thermal analysis of temperature data collected from a distributed temperature sensor system for estimating thermal properties of a wellbore

Monitoring internal parameters of electrical motor systems

Temperature measurement device, temperature measurement method, and temperature measurement program

TEMPERATURE MEASUREMENT DEVICE, TEMPERATURE MEASUREMENT METHOD, AND TEMPERATURE MEASUREMENT PROGRAM A temperature measurement device characterized by comprising: a detector configured to detect a first Stokes component and a first anti-Stokes component from a back scattering light generated when a light is input into a first end of an optical fiber and detect a second Stokes component and a second anti-Stokes component from a back scattering light generated when a light is input into a second end of the optical fiber; a corrector configured to, within a predetermined region including a sample point of a partial region on the first end side of the optical fiber, calculate a first average range including the sample point on a basis of a first correlation between the second Stokes component and at least one of the first Stokes component and the first anti-Stokes component so that the larger the first correlation is, the smaller the first average range is, calculate a second average range including ...

LOSS COMPENSATION FOR DISTRIBUTED SENSING IN DOWNHOLE ENVIRONMENTS

An apparatus for estimating a parameter includes: an optical fiber sensor including at least one optical fiber configured to be disposed in a downhole location and including at least one sensing location configured to generate measurement signals; at least one light source configured to transmit a measurement signal having a wavelength to interrogate a sensing location and cause the sensing location to return a reflected measurement signal indicative of a measured parameter, and configured to transmit a reference signal and cause a reflected reference signal to be returned from a location associated with the sensing location, the reflected reference signal having a known relationship to hydrogen concentration; and a processor configured to receive the reflected measurement signal and the reflected reference signal, estimate the hydrogen concentration based on the reflected reference signal, and calibrate the first reflected signal based on the estimated hydrogen concentration.

OPTICAL FIBER TEMPERATURE DISTRIBUTION MEASURING APPARATUS, OPTICAL FIBER TEMPERATURE DISTRIBUTION MEASURING METHOD AND OPTICAL FIBER TEMPERATURE DISTRIBUTION MEASURING SYSTEM

An optical fiber temperature distribution measuring apparatus and a method for measuring optical fiber temperature distribution, provided with a light source for inputting a pulse light to an optical fiber to be measured, a signal detecting unit for detecting a received light intensity of a predetermined light included in a backscattering light generated by an input of the pulse light in the optical fiber to be measured, and a signal processing unit for calculating a value corresponding to a variation of the received light intensity due to a hydrogen molecular absorption of the optical fiber to be measured based on the received light intensity of the predetermined light, to compensate the received light intensity of the predetermined light corresponding to a temperature of the optical fiber to be measured based on the value.

OPTICAL FIBRE DISTRIBUTED LHD WITH SMA ELEMENT FOR DISCRETE ALARM

A temperature sensing system 10 comprises an optical waveguide 102, a shape memory alloy (SMA) element 106a, and an interrogator 12. The SMA element 106a is deformable as a function of temperature and at least partially surrounds the optical waveguide 102. The interrogator 12 is configured to detect distributed temperature along the optical waveguide 102 using spectroscopy and to detect strain in the optical waveguide 102 induced by deformation of the SMA element 106a to identify local hot spots along the optical waveguide 102.

Temperature measurement system and temperature measurement method

A temperature measurement system includes: a laser light source; an optical fiber; and a temperature measurement unit configured to acquire a measured temperature distribution of a temperature of a temperature measurement area along an installation path of the optical fiber by detecting backscattered light of the incident laser light in the optical fiber, wherein the temperature measurement unit sequentially makes a correction for the measured temperature distribution a plurality of times so as to make a square error between a convolution of a transfer function of the optical fiber along the installation path and the corrected temperature distribution and the measured temperature distribution smaller in each of the corrections, and the temperature measurement unit also replaces a corrected temperature at a specific point of the installation path with an estimated temperature at the specific point in each of the corrections.

Systems and methods for high-speed, spectroscopic, gas-phase thermometry

Systems and methods for measuring temperature in an environment by creating a first beam having an energy of about 50 mJ/pulse, and a pulse duration of about 100 ps. A second beam is also created, having an energy of about 2.3 mJ/pulse, and a pulse duration of about 58 ps. The first beam and the second beam are directed into a probe region, thereby expressing an optical output. Properties of the optical output are measured at a sampling rate of at least about 100 kHz, and temperature measurements are derived from the measured properties of the optical output. Such systems and methods can be used to measure temperature in environments exhibiting highly turbulent and transient flow dynamics.

Verteiltes optisches Messen mit zwei-stufiger Auswertung

Gemäß einer Ausführungsform wird eine verteilte optische Messvorrichtung zum Bestimmen einer primären Größe entlang eines Wellenleiters bereitgestellt, wobei die verteilte optische Messvorrichtung folgendes aufweist: eine Quelle von elektromagnetischer Strahlung, die dazu ausgebildet ist, elektromagnetische Strahlung in den Wellenleiter zu koppeln, um dadurch in dem Wellenleiter (z. B. durch Wechselwirkung mit dem Wellenleiter) eine erste Antwortstrahlung und eine davon verschiedene zweite Antwortstrahlung zu erzeugen; eine Detektoreinrichtung, die dazu ausgebildet ist, ein erstes Messsignal, das für die erste Strahlungsantwort indikativ ist, und ein zweites Messsignal, das für die zweite Antwortstrahlung indikativ ist, bereitzustellen; eine Auswertungseinheit, die dazu ausgebildet ist, eine sekundäre Größe (z. B. einen Verlust) auf der Grundlage von dem ersten Messsignal und dem zweiten Messsignal abzuleiten, wobei die Auswertungseinheit ferner dazu ausgebildet ist, die primäre Größe auf ...

CORRECTED DTS MEASUREMENTS BASED ON RAMAN-STOKES SIGNALS

Dts performance improvement through variable mode path length averaging

Temperature measurement device, temperature measurement method, and temperature measurement program

This temperature measurement device is provided with: a detector that detects a first Stokes component and a first anti-Stokes component in back-scattered light produced when light enters a first end of an optical fiber, and detects a second Stokes component and a second anti-Stokes component in back-scattered light produced when light enters a second end of the optical fiber; a correction unit that, within a prescribed region containing a sample point of a partial region of the first end side of the optical fiber, replaces the second anti-Stokes component with a value corresponding to the first Stokes component, the first anti-Stokes component, and the second Stokes component if any size of a correlation of the second anti-Stokes component to the first Stokes component and the first anti-Stokes component is less than or equal to a threshold value; and a measurement unit that measures the temperature at the sample point using the first Stokes component, the first anti-Stokes component, ...

HYBRID DISTRIBUTED ACOUSTIC TESTING

The subject matter of this specification can be embodied in, among other things, a method that includes separating, from a few mode optical fiber, a collection of backscattered Rayleigh signals based on a vibration of the few mode optical fiber at a vibration frequency at a first location along the few mode optical fiber, separating, from the few mode optical fiber, a collection of backscattered Stokes Raman signals and Anti-Stokes Raman signals based on a temperature of the few mode optical fiber at a second location along the few mode optical fiber, detecting the separated Rayleigh signals and Raman signals, determining, based on detecting the collection of backscattered Rayleigh traces, at least one of the first location, the vibration frequency, and an amplitude of the vibration, and determining, based on the detecting the collection of backscattered Raman signals, the temperature at the second location.

DTS PERFORMANCE IMPROVEMENT THROUGH VARIABLE MODE PATH LENGTH AVERAGING

A system and method to determine temperature include an optical fiber and at least two pulse laser sources to transmit light pulses with at least two wavelengths into the optical fiber. The system also includes an optical path length modulator to modulate the optical path length of the optical fiber as the light pulses are transmitted into the optical fiber. At least two photodetectors detect backscatter reflected in the optical fiber, and a processor determines the temperature based on the backscatter.

DISTRIBUTED TEMPERATURE SENSING OVER EXTENDED TEMPERATURE RANGES

A method is described for enabling Raman Based Distributed Temperature Sensing (DTS) systems to operate over larger environmental temperature ranges than any systems available today.

METHOD FOR MONITORING THE THERMOMECHANICAL BEHAVIOR OF A SUBMARINE PIPELINE FOR TRANSPORTATION OF FLUIDS UNDER PRESSURE

Clinical thermometer

The disclosure relates to a clinical thermometer for non-invasive measurement of sub-cutaneous temperature of tissue of a human or animal subject. Probe light is collected from a collection region spatially offset from an entry region on a visible surface of the subject, following scattering within the tissue, and a temperature of the tissue is determined from Raman spectral features in the collected light.

Component e.g. plate-type heat exchanger, temperature measuring method for petrochemical industry or petrochemical system, involves evaluating optical signals of optical fiber present inside component

The method involves evaluating optical signals of an optical fiber present inside components. Temperature measurement is made by the evaluation of the optical signals, by Raman scattering or Brillouin scattering of the optical fiber or by scattering at a Bragg lattice. A rear-scattered light is divided into three spectral groups. Intensity relationship between stoke and anti-stoke components is utilized for the temperature measurement.

Distributed sensing considering two relations between measurement signals

A distributed sensing device 100 and method for measuring a physical quantity by determining a first relation between at least two signals and applying a correcting factor derived from a second, different relation between the same signals. The physical quantity may be temperature, strain or a distribution of either. The device 100 comprising a measuring unit 102 and a determining unit 104 receiving signals from the distributed sensing unit 110. The device may measure the Raman Stokes and anti-Stokes signals in a fibre, the first relationship may be a ratio and the second may be a deviation from a target value and/or a normalised difference. The correction may bring the second relation to the target value or in line with a predefined model. The signals may be weighted independent of the physical quantity, weighting may depend upon noise or signal-to-noise ratios. The target value may be averaged spatially or temporally, the correction may be applied at discrete locations.

Loss compensation for distributed sensing in downhole environments

Loss compensation for distributed sensing in downhole environments

Optical fiber temperature distribution measuring apparatus, method and system

Optical fibre distributed LHD with SMA element for discrete alarm

Temperature measurement with optical fibre

Determination device, determination method, and determination program

A determination device equipped with: a model creation unit that creates a standard model of a sensor detection value; a determination unit that determines whether the time from a prescribed point in time until the deviation between the standard model and the sensor detection value exceeds a threshold value is shorter than a prescribed time; and an output unit that outputs a signal associated with an abnormality when the time is determined to be shorter.

Determination device, determination method, and determination program

A determination device equipped with: a model creation unit that creates a standard model of a sensor detection value; a determination unit that determines whether the time from a prescribed point in time until the deviation between the standard model and the sensor detection value exceeds a threshold value is shorter than a prescribed time; and an output unit that outputs a signal associated with an abnormality when the time is determined to be shorter.

APPLICATION OF DEPTH DERIVATIVE OF DTS MEASUREMENTS IN IDENTIFYING INITIATION POINTS NEAR WELLBORES CREATED BY HYDRAULIC FRACTURING

A method for using the depth derivative of distributed temperature sensing data to identify initiation points near wellbores created by hydraulic fracturing comprises providing a fiber optic based distributed temperature sensing measurement system through a production region; gathering the temperatures through the production region as a function of the depth in the subsurface well and as a function of the elapsed time; calculating from the gathered data the depth derivative of the temperature changes as a function of depth in the subsurface well and of the elapsed time; and displaying the depth derivative data for analysis of initiation points near wellbores created by hydraulic fracturing.

DUAL SOURCE AUTO-CORRECTION IN DISTRIBUTED TEMPERATURE SYSTEMS

An automatic and continuous method is presented to improve the accuracy of fiber optic distributed temperature measurements derived from Raman back scatterings utilizing two light sources with different wavelengths, by choosing the wavelengths of the two sources so the primary source's return anti-Stokes component overlaps with the incident wavelength of the secondary light source thereby canceling out the non- identical attenuations generated by the wavelength differences between Stokes and anti-Stokes bands.

Distributed Sensing of Electromagnetic Components Using Optical Fiber Based Methods

An OFDR based fiber-optics sensor for distributed real-time temperature rise monitoring of a transformer in operation has been disclosed. The fiber-optic sensor provides an effective solution to monitoring the physical structures of the transformer core, as well as accurately detecting the non-uniform temperature distribution inside the transformer, and thus provides innovative feedback to the transformer design by minimizing the core losses. Additionally, the method may be responsive to the presence of magnetic and electric fields, as well as responsive to various chemical species. The method allows novel approaches to real-time asset monitoring of power transformers while operational.

Dual wavelength distributed temperature sensing with built-in fiber integrity monitoring

In some examples, a temperature distribution sensor may include a laser source to emit a laser beam that is tunable to a first wavelength and a second wavelength for injection into a device under test (DUT). A first wavelength optical receiver may convert a return signal corresponding to the first wavelength with respect to Rayleigh backscatter or Raman backscatter Anti-Stokes. A second wavelength optical receiver may convert the return signal corresponding to the second wavelength with respect to Rayleigh backscatter or Raman backscatter Stokes. Bending loss associated with the DUT may be determined by utilizing the Rayleigh backscatter signal corresponding to the first wavelength and the Rayleigh backscatter signal corresponding to the second wavelength. Further, temperature distribution associated with the DUT may be determined by utilizing the Raman backscatter Anti-Stokes signal corresponding to the first wavelength and the Raman backscatter Stokes signal corresponding to the second ...

ÜBERWACHUNG VON INTERNEN PARAMETERN VON ELEKTROMOTOREN

Optical fiber temperature distribution measuring apparatus, optical fiber temperature distribution measuring method and system

An optical fiber temperature distribution measuring apparatus is provided with a light source for inputting pulsed light to an optical fiber to be measured; a signal detecting section for detecting light receiving intensity of prescribed light included in backscattered light generated in the optical fiber, based on entry of the pulsed light; and a signal processing section, which calculates a value corresponding to a quantity of a change of the light receiving intensity due to hydrogen molecule absorption of the optical fiber, based on the receiving light intensity of the prescribed light, and corrects the receiving light intensity corresponding to the temperature of the optical fiber, based on the calculated value. An optical fiber temperature distribution measuring method is also provided.

Distributed sensing in a well

A well 202 defines a fluid flow path 209 extending from an opening 208 of the well at a surface to one or more subterranean regions located below the surface. A method for use in distributed sensing of an environmental parameter within the well comprises deploying a distributed sensing element 224 along the well so that a reference section 222 of the distributed sensing element is located at a position in the well which is out of the fluid flow path. The method further comprises using the distributed sensing element to measure a value of a sensed parameter at each of a plurality of sensing positions along the distributed sensing element, converting the measured value of the sensed parameter at each sensing position into a value of the environmental parameter, and using a known reference value of the environmental parameter associated with the location of the reference section in the well to correct the value of the environmental parameter at each sensing position. The sensing element may ...

Distributed optical sensing with two-step evaluation

According to an embodiment there is provided a distributed optical sensing apparatus for determining of a primary quantity along a waveguide, the distributed optical sensing apparatus comprising: an electromagnetic radiation source adapted for coupling electromagnetic radiation into the waveguide to thereby generate in the waveguide (e.g. by interaction with the waveguide) a first response radiation and a different second response radiation; a detector device adapted for providing a first measurement signal indicative of the first response radiation and a second measurement signal indicative of the second response radiation; an evaluation unit adapted for deriving a secondary quantity (e.g. a loss) based on the first measurement signal and the second measurement signal; the evaluation unit being further adapted for deriving the primary quantity based on the secondary quantity and at least one of the first measurement signal and the second measurement signal.

Methods of optical detection and optical detection apparatus

Thermal analysis of temperature data collected from a distributed temperature sensor system for estimating thermal properties of a wellbore

Temperature data collected from a distributed temperature sensing system may be used to prepare a temporal thermal profile of the wellbore. The temporal thermal profile may be used to determine a generalized heat transfer coefficient (k) and/or a generalized geothermal profile (T ae ). The temporal thermal profile and the generalized heat transfer coefficient (k) and/or the generalized geothermal profile (T ae ) may be used to estimate thermal properties of a wellbore, such as well as fluid and flow characteristics. A heat of hydration index may also be determined based on the temporal thermal profile.

Temperature measuring system and abnormality detecting method

... [Problem] To provide a temperature measuring system and abnormality detecting method capable of detecting, at an early stage, abnormalities occurring at facilities such as chemical plants, oil refineries, and fossil-fuel power plants. [Solution] A temperature measuring system has an optical fiber (30), a temperature distribution measuring device (31), and a data processing device (32). The temperature distribution measuring device (31) detects backscattered light by inputting light to the optical fiber (30), and acquires the temperature distribution along the lengthwise direction of the optical fiber (30) from those detection results. The data processing device (32) stores the temperature distribution acquired with the temperature distribution measuring device (31), and, by calculating the differential of the current temperature distribution and a past temperature distribution and performing signal processing with respect to the acquired differential temperature distribution, determines ...

Temperature measurement device, temperature measurement method, and temperature measurement program

This temperature measuring device is provided with: a light source that causes light to enter an optical fiber; a detector that detects a Stokes component and an anti-Stokes component in back-scattered light that is from the optical fiber; a correction unit that, within a prescribed region containing a prescribed sample point of the optical fiber, calculates a prescribed range, which contains the sample point, in accordance with the size of the correlation between the Stokes component and the anti-Stokes component, and smooths the Stokes component and the anti-Stokes component within the prescribed range; and a measurement unit that measures the temperature at the sample point using the smoothed Stokes component and the smoothed anti-Stokes component.

HIGH SPEED DISTRIBUTED TEMPERATURE SENSING WITH AUTO CORRECTION

A system and method for a higher speed auto-correcting temperature measurement in a system using a fiber optic distributed sensor.

DISTRIBUTED TEMPERATURE SENSING OVER EXTENDED TEMPERATURE RANGES

A method is described for enabling Raman Based Distributed Temperature Sensing (DTS) systems to operate over larger environmental temperature ranges than any systems available today.

TAILOR DISTRIBUTED AMPLIFICATION FOR FIBER SENSING

A method of providing in-line Raman amplification in an optical fiber sensing system, including the procedures of generating a probe light having a probe wavelength, transmitting the probe light into an optical fiber, generating at least one Raman pump light at a respective pump wavelength, the pump wavelength being shorter than the probe wavelength, generating at least one Raman seed light at a respective seed wavelength, the seed wavelength being between the pump and probe wavelengths, transmitting the Raman pump light into the optical fiber, transmitting the Raman seed light into the optical fiber and propagating the Raman pump light, the Raman seed light and the probe light along the optical fiber to achieve distributed Raman amplification of signal light produced by the probe light as it propagates along the optical fiber.

STATIC ELECTRIC INDUCTION APPARATUS COMPRISING A WINDING AND A SENSOR SYSTEM FOR MONITORING THE TEMPERATURE IN THE WINDING

The present invention relates to a static electric induction apparatus (1b) comprising a winding (2) including a plurality of winding units (3), at least one first spacer element (5) arranged between the winding units (3) and including a first groove (18) defined in the surface thereof, and a sensor system for monitoring the temperature in the apparatus, wherein the sensor system comprises an elongated and flexible temperature sensing element (16) disposed in the first groove.The first groove (18) has a curved part that receives the flexible temperature sensing element which is wound at least one revolution in the first groove (18). The first groove enters and exits the first spacer element in one and the same end of the first spacer element. The apparatus comprises an elongated second spacer element (14a) extending in an axial direction on the outside of the winding (2). The second spacer element (14a) comprises an elongated second groove (22) arranged in communication with the first groove, and the flexible temperature sensing element (16) is disposed in the first and second grooves.

Raman fiber temperature sensing system and noise compensation method thereof

... 本发明涉及传感技术领域，公开一种拉曼光纤温度传感系统及其噪声补偿方法，以考虑波分复用等环节所引入的噪声实现对整体光纤段测量结果的数据矫正。本发明的技术方案中，将采集光纤上同一点在不同测量温度下斯托克斯光与反斯托克斯光的比值与的比值N(T)看作恒定常数与噪声补偿函数的乘积；然后选取两测温参考段，借助两参考段的测量数据来求解系数B，得到系数B后，对光纤上每个点，得到温度解调公式。进一步的，本发明还可结合光纤距离损耗系数，实现对整体光纤段测量结果更精确的数据矫正。 ...

Corrected DTS measurements based on Raman-Stokes signals

Methods and apparatus allowing distributed temperature sensing (DTS) measurements to be compensated for differential and/or varying loss between Raman Stokes and anti-Stokes signals are provided. By irradiating an optical waveguide with signals at wavelengths at or near the Raman Stokes and anti-Stokes bands, a distributed loss profile for the waveguide may be generated. This distributed loss profile may be used to adjust the amplitudes or amplitude ratios of Raman Stokes and anti-Stokes signals used in DTS measurements, which may lead to more accurate DTS profiles.

Filtering distributed sensing data

A distributed sensing device (100) is disclosed, for determining a physical quantity, which comprises a measuring unit (102) configured for measuring signals over time and space by distributed sensing, a determining unit (118) configured for determining, based on the measured signals, data being correlated to the physical quantity, and a filtering unit (104) configured for filtering the data to reduce noise and substantially preserve real features based on at least one filter parameter which is determined depending on the data which relate to the physical quantity at a plurality of different times. The filtering unit may omit or reduce filtering around the occurrence of a real feature. A real feature may be identified by averaging a spatial derivative of the data over time and / or by averaging a temporal derivative of the data over space. Alternatively a real feature may be determined using pattern recognition using cross correlation. The filtering unit may determine the degree of filtering ...

Distributed sensing considering two relations between measurement signals

Loss compensation for distributed sensing in downhole environments

An apparatus for estimating a parameter includes: an optical fiber sensor including at least one optical fiber configured to be disposed in a downhole location and including at least one sensing location configured to generate measurement signals; at least one light source configured to transmit a measurement signal having a wavelength to interrogate a sensing location and cause the sensing location to return a reflected measurement signal indicative of a measured parameter, and configured to transmit a reference signal and cause a reflected reference signal to be returned from a location associated with the sensing location, the reflected reference signal having a known relationship to hydrogen concentration; and a processor configured to receive the reflected measurement signal and the reflected reference signal, estimate the hydrogen concentration based on the reflected reference signal, and calibrate the first reflected signal based on the estimated hydrogen concentration.

Measurement of temperature using combination of rayleigh and raman backscatter interferometry

A method of measuring temperatures, includes disposing a carrier in a borehole in an earth formation, the carrier having an optical fiber connected thereto, interrogating the optical fiber with a pulsed optical signal generated by a distributed temperature sensing (DTS) assembly, the pulsed optical signal having a first frequency, and receiving first reflected signals from the optical fiber, estimating an absolute temperature from the reflected signals, interrogating the optical fiber with an at least partially coherent optical signal from a phase sensitive optical time domain reflectometry (ϕ-OTDR) assembly, the at least partially coherent optical signal having a second frequency, and receiving second reflected signals from multiple scattering locations in the optical fiber; estimating a phase difference between the reflected signals, and estimating a temperature change based on the phase difference, and combining the absolute temperature and the temperature change to generate a temperature ...

Tailor distributed amplification for fiber sensing

A method of providing in-line Raman amplification in an optical fiber sensing system, including the procedures of generating a probe light having a probe wavelength, transmitting the probe light into an optical fiber, generating at least one Raman pump light at a respective pump wavelength, the pump wavelength being shorter than the probe wavelength, generating at least one Raman seed light at a respective seed wavelength, the seed wavelength being between the pump and probe wavelengths, transmitting the Raman pump light into the optical fiber, transmitting the Raman seed light into the optical fiber and propagating the Raman pump light, the Raman seed light and the probe light along the optical fiber to achieve distributed Raman amplification of signal light produced by the probe light as it propagates along the optical fiber.

CANE-BASED U-BEND

Large diameter optical waveguides (cane) may stiffen as diameter increases. The minimum bend radius may become larger than is practical for many applications. Standard-sized optical fibers may be fusion spliced to the ends of a cane segment where the fusion splice area is protected with a high temperature coating such as polyimide. The cane segment is then heated (e.g., using a hot flame torch or arc) and bent to form a U-bend, or other angle, that is free of bending stress. The heated glass may be shaped, while maintaining the waveguide properties of the cane. Once cooled, the cane maintains the new shape. Therefore, light may be propagated around the bend or angle. Thus, many configurations of cane devices may be fabricated. Some examples of cane configurations include coils, U-turns (U-bends), angled inputs/outputs, etc. Bent cane may be useful for loop-back operations, such as double-ended Raman distributed temperate sensing (DTS).

HIGH SPEED DISTRIBUTED TEMPERATURE SENSING WITH AUTO CORRECTION

A system and method for a higher speed auto-correcting temperature measurement in a system using a fiber optic distributed sensor.

Dual source auto-correction in distributed temperature systems.

An automatic and continuous method is presented to improve the accuracy of fiber optic distributed temperature measurements derived from Raman back scatterings utilizing two light sources with different wavelengths, by choosing the wavelengths of the two sources so the primary source's return anti-Stokes component overlaps with the incident wavelength of the secondary light source thereby canceling out the non- identical attenuations generated by the wavelength differences between Stokes and anti-Stokes bands.

ALUMINUM DOPED OPTICAL FIBER

According to one example of the invention an optical fiber comprises: (i) a core (12) consisting of Al doped silica having a first index of refraction n1; (ii) at least one silica based cladding (14) surrounding the core and having a second index of refraction n2, such that n1>n2; (iii) a hermetic carbon based coating (16) surrounding said cladding, said hermetic coating being 300nm -1000 nm thick; and (iv) a second coating (18) surrounding said hermetic coating, said second coating being 5 µm to 80 µm thick.

TEMPERATURE MEASUREMENT SYSTEM AND ABNORMALITY DETECTION METHOD

... [Problem] To provide a temperature measuring system and abnormality detecting method capable of detecting, at an early stage, abnormalities occurring at facilities such as chemical plants, oil refineries, and fossil-fuel power plants. [Solution] A temperature measuring system has an optical fiber (30), a temperature distribution measuring device (31), and a data processing device (32). The temperature distribution measuring device (31) detects backscattered light by inputting light to the optical fiber (30), and acquires the temperature distribution along the lengthwise direction of the optical fiber (30) from those detection results. The data processing device (32) stores the temperature distribution acquired with the temperature distribution measuring device (31), and, by calculating the differential of the current temperature distribution and a past temperature distribution and performing signal processing with respect to the acquired differential temperature distribution, determines ...

Tailor distributed amplification for fiber sensing

A method of providing in-line Raman amplification in an optical fiber sensing system, including the procedures of generating a probe light having a probe wavelength, transmitting the probe light into an optical fiber, generating at least one Raman pump light at a respective pump wavelength, the pump wavelength being shorter than the probe wavelength, generating at least one Raman seed light at a respective seed wavelength, the seed wavelength being between the pump and probe wavelengths, transmitting the Raman pump light into the optical fiber, transmitting the Raman seed light into the optical fiber and propagating the Raman pump light, the Raman seed light and the probe light along the optical fiber to achieve distributed Raman amplification of signal light produced by the probe light as it propagates along the optical fiber.

Measuring temperature in a diffusely scattering sample

Corrected dts measurements based on raman-stokes signals

Clinical thermometer

Optical fibre distributed LHD with SMA element for discrete alarm

Distributed sensing considering two relations between measurement signals

Temperature monitoring apparatus

Fiber optic distributed temperature sensing of annular cement curing using a cement plug deployment system

A system includes: a cementing tool positionable within a casing string of a wellbore; a distributed temperature sensing (DTS) system comprising: a fiber optic cable coupled to the cementing tool; and a DTS interrogator positionable at a surface of the wellbore for transmitting an optical signal through the fiber optic cable and determining from a reflected optical signal a plurality of temperatures along the fiber optic cable; a fiber reel for dispensing the fiber optic cable from a first end of the fiber optic cable in response to a tension in the fiber optic cable as the cementing tool travels down the casing string behind a cement composition; and a processor in communication with the DTS system and configured to monitor the plurality of temperatures along the fiber optic cable while the cement composition cures.

Abnormality detection system and abnormality detection method

... [Problem] To provide an abnormality detection system and abnormality detection method capable of detecting, at an initial stage, an abnormality occurring at a facility such as a chemical plant, oil refinery or mill, or thermal power plant. [Solution] An abnormality detection system has an optical fiber (26), a backscattered light detector (20), and a data processing unit (30). The backscattered light detector (20) is connected to one end side and another end side of the optical fiber (26), irradiates light into the optical fiber (26) from the one end side to acquire a first backscattered light intensity distribution, and irradiates light into the optical fiber (26) from the other end side to acquire a second backscattered light intensity distribution. The data processing unit (30) uses the first intensity distribution, the second intensity distribution, and a standardization function to calculate the transmission loss at each position in the length direction of the optical fiber (26) and ...

APPLICATION OF THE TIME DERIVATIVE OF DISTRIBUTED TEMPERATURE SURVEY (DTS) IN IDENTIFYING FLOWS IN AND AROUND A WELLBORE DURING AND AFTER HYDRAULIC FRACTURE

A method for using the time derivative of distributed temperature sensing (DTS) data obtained during hydraulic fracturing to identify fluid activities not as evident in conventional DTS date inside or near the wellbore during the hydraulic fracturing process comprises providing a fiber optic based distributed temperature sensing measurement system through a production region; gathering the temperatures through the production region as a function of the depth in the subsurface well and as a function of the elapsed time; calculating from the gathered data the time derivative of the temperature changes as a function of depth in the subsurface well and of the elapsed time; and displaying the time derivative data for analysis of the fluid activities inside or near the wellbore during the hydraulic fracturing process to identify fluid activities inside or near the wellbore.

AUTO-CORRECTING OR SELF-CALIBRATING DTS TEMPERATURE SENSING SYTEMS AND METHODS

An automatic auto-correcting method is presented to improve the accuracy of fiber optic distributed temperature measurements derived from Raman back scatterings utilizing two light sources with different wavelengths, by appropriate choice of the wavelengths of the two sources, the use of single pulse modulating circuit for the two light sources, and use of one of the light sources as a primary measurement system and the second light source as an occasional correcting source.

Low profile, high temperature, hydrogen tolerant optical sensing cable

A sensing cable has a sensing fiber assembly, which includes a pair of sensing fibers joined by a turnaround section with a modal filter, at a terminating end of the sensing fibers. The sensing cable also includes an inner sleeve that surrounds the sensing fiber assembly and an armored casing that caps the terminating end of the inner sleeve. The sensing cable has a low profile and its components are each made of high temperature and hydrogen tolerant materials and are capable of prolonged operation at high temperatures, such as up to 300° C., in hydrogen environments over long lengths of fiber. A distributed thermal sensing (DTS) interrogator is connected to the sensing cable and performs DTS measuring according to protocols and algorithms that leverage the modal filter of the turnaround section to calculate temperature readings along the sensing fiber assembly.

High temperature fiber optic turnaround

A sensing cable includes a pair of sensing fibers that are connected to one another by a U-shaped turnaround section. The turnaround section is a section of sensing fiber coated with a jacket that includes metallic components. The turnaround section is bent and, then, annealed according to a method of the present invention. The turnaround section is robust and reduced in size (i.e., radius). The sensing cable also includes an inner sleeve that surrounds the sensing fibers and an elongated outer armor casing (i.e., including an armor tube and a sealing cap) that encases a terminating end thereof. The armor tube and the sealing cap protect the sensing fiber from mechanical and chemical harm, are reduced in size and facilitate insertion of the sensing cable into downhole environments. The sensing cable has improved operating range up to 300° C.

Filtering Distributed Sensing Data

A distributed sensing device for determining a physical quantity which comprises a measuring unit configured for measuring signals over time and space by distributed sensing, a determining unit configured for determining, based on the measured signals, data being correlated to the physical quantity, and a filtering unit configured for filtering the data to reduce noise and substantially preserve real features based on at least one filter parameter which is determined depending on the data which relate to the physical quantity at a plurality of different times.

Extending A Range Of An Optical Fiber Distributed Sensing System

Embodiments are directed to a distributed temperature sensing system. The system includes a first fiber optic cable and a second fiber optic cable. A first coupler is coupled to the first fiber optic cable. A second coupler is coupled to the second fiber optic cable. An optical isolator coupled between the first coupler and the second coupler to remove a Stokes signal in order to increase the range of the distributed temperature sensing system.

Temperature measurement device and temperature measurement method

A temperature measurement device includes: an optical fiber that is arranged along a predetermined path; a light source configured to input a light into the optical fiber; a measurer configured to measure temperature distribution information in an extension direction of the optical fiber based on a back-scattering light from the optical fiber; and a corrector configured to make a filter for reducing a noise component of temperature distribution information measured by the measurer based on a difference of temperature distribution information between two different regions of the optical fiber in which a common temperature distribution is obtained, and correct the temperature distribution information by applying the filter to the temperature distribution information.

Application of depth derivative of distributed temperature survey (dts) to identify fluid level as a tool of down hole pressure control

A method for using the depth derivative of distributed temperature sensing data to identify fluid levels as a tool of downhole pressure control comprises providing a fiber optic based distributed temperature sensing measurement system through a production region; gathering the temperatures through the production region as a function of the depth in the subsurface well and as a function of the elapsed time; calculating from the gathered data the depth derivative of the temperature changes as a function of depth in the subsurface well and of the elapsed time; and displaying the depth derivative data for analysis of the fluid levels to identify fluid levels.

SINGLE MODE FIBER DISTRIBUTED TEMPERATURE SENSING WITH IMPROVED NOISE CHARACTERISTICS

Aspects of the present disclosure describe single mode fiber distributed temperature sensing (DTS) with improved noise characteristics employing superluminescent emitting diodes (SLEDs) and/or amplified spontaneous emission (ASE) light sources. 1. A distributed temperature sensing (DTS) system comprising:a length of single-mode optical fiber; andan optical interrogator unit that generates optical pulses, introduces them into the optical fiber, receives backscattered signals from the optical fiber, and determines one or more temperatures at points along the optical fiber from the backscattered signals;the DTS system CHARACTERIZED BY:light comprising the optical pulses introduced into the single-mode optical fiber is generated by a light source selected from the group consisting of: superluminescent emitting diode(s) (SLEDs) and amplified spontaneous emission (ASE) source(s).2. The system of FURTHER CHARACTERIZED BY:a wavelength-division-multiplexing filter (WDM filter) interposed in an optical path between the light source and the optical fiber.3. The system of FURTHER CHARACTERIZED BY:a continuous wavelength erbium-doped fiber amplifier (CW EDFA) interposed in the optical path between the WDM filter and the optical fiber.4. The system of FURTHER CHARACTERIZED BY:a second WDM filter interposed in the optical path between the CW EDFA and the optical fiber.5. The system of FURTHER CHARACTERIZED BY:a semiconductor optical amplifier (SOA) interposed in the optical path between the second WDM filter and the optical fiber.6. The system of FURTHER CHARACTERIZED BY:an erbium-doped fiber amplifier interposed in the optical path between the SOA and the optical fiber. This disclosure claims the benefit of United States Provisional Patent Application Ser. No. 62/851,144 filed May 22, 2019 the entire contents of which is incorporated by reference as if set forth at length herein.This disclosure relates generally to distributed temperature sensing systems, methods, and structures. ...

Computational Distributed Fiber-Optic Sensing Method and System

The present invention discloses a computational distributed fiber-optic sensing method and system. The method includes: determining a signal source for modulating intensity of incident light, where the signal source is a binary sequence; using an optical pulse sequence obtained after modulation is performed using the signal source, as an incident light signal, and emitting the incident light signal to an optical fiber; acquiring, according to specified sampling frequency, a scattered light signal obtained through optical fiber scattering; determining, according to the incident light signal and the scattered light signal, a time-domain reconstructed image of a to-be-detected light signal by using a time domain-based differential ghost imaging protocol; and determining a sensing signal of the optical fiber according to the time-domain reconstructed image of the to-be-detected light signal. The computational distributed fiber-optic sensing method and system provided in the present invention feature low sampling frequency, low device complexity, and low costs.

Optical fibre distributed lhd with sma element for discrete alarm

A temperature sensing system 10 comprises an optical waveguide 102 , a shape memory alloy (SMA) element 106 a , and an interrogator 12 . The SMA element 106 a is deformable as a function of temperature and at least partially surrounds the optical waveguide 102 . The interrogator 12 is configured to detect distributed temperature along the optical waveguide 102 using spectroscopy and to detect strain in the optical waveguide 102 induced by deformation of the SMA element 106 a to identify local hot spots along the optical waveguide 102.

Methods and Devices for Standoff Differential Raman Spectroscopy with Increased Eye Safety and Decreased Risk of Explosion

A compact, portable Raman spectrometer makes fast, sensitive standoff measurements at little to no risk of eye injury or igniting the materials being probed. This spectrometer uses differential Raman spectroscopy and ambient light measurements to measure point-and-shoot Raman signatures of dark or highly fluorescent materials at distances of 1 cm to 10 m or more. It scans the Raman pump beam(s) across the sample to reduce the risk of unduly heating or igniting the sample. Beam scanning also transforms the spectrometer into an instrument with a lower effective safety classification, reducing the risk of eye injury. The spectrometer's long standoff range automatic focusing make it easier to identify chemicals through clear and translucent obstacles, such as flow tubes, windows, and containers. And the spectrometer's components are light and small enough to be packaged in a handheld housing or housing suitable for a small robot to carry. 1. A method of Raman spectroscopy of a sample , the method comprising:measuring a range of between about 2 centimeters and 400 centimeters from a Raman spectroscopy system to the sample;automatically focusing a Raman pump beam emitted by the Raman spectroscopy system based on the range from the Raman spectroscopy system to the sample;detecting a Raman signal from the sample in response to the Raman pump beam; andestimating a Raman signature of the sample based on the Raman signal.2. The method of claim 1 , wherein measuring the range from the Raman spectroscopy system to the sample comprises:illuminating the sample with a beam propagating along an optical axis of a telescope of the Raman spectroscopy system to form a spot on the sample;detecting the position of spot with a camera that is in optical communication with the spot and that is not located on the optical axis of the telescope;calculating the range based on the position of the image of the spot formed on the camera.3. The method of claim 1 , wherein measuring the range from ...

Method and apparatus for measuring a distributed physical value of an optical device under test

A method for measuring a distributed physical value of an optical device under test (DUT), includes the steps of: launching into the DUT a probe signal that includes a plurality of optical pulses at at least one test wavelength, and receiving at least one optical signal backscattered by the DUT, wherein the optical pulses are obtained with at least the following steps: generating a first time sequence of first pulses that corresponds to a word of a first code, the first time sequence lasting not shorter than a time of flight and being formed by a number of time slots that is equal to the number of bits of the word of the first code; generating a second time sequence of second pulses that corresponds to a word of a second code; and amplitude modulating the second time sequence with the first time sequence.

Device and Method for High Precision Fiber-Optic Temperature Profile Measurements in Long Length Areas

A high precision fiber-optic device and method are developed for measuring a temperature profile in a long length area. The temperature profile is derived based on a ratio between the intensities of anti-Stokes Raman and Stokes Raman backscattered components. The power output of the amplified pulsed optical radiation delivered to the sensing optical fiber via a reference optical fiber, is controlled such as to maintain a substantially fixed intensity level of the anti-Stokes Raman component of the optical radiation back scattered from the reference optical fiber. Controlling the output power of the of the amplified pulsed optical radiation is carried out based on a feedback representative of the intensity level of the anti-Stokes Raman component of the optical radiation back scattered from the reference optical fiber.

Broad Bandwidth Graded Index Multimode Optical Fiber For Distributed Temperature Sensing In The 550NM Region

Disclosed herein is a method for measuring temperature via distributed temperature sensing comprising transmitting light through a fiber optic cable; detecting backscattered light in the fiber optic cable, wherein the backscattered light comprises an anti-Stokes band and a Stokes band; calculating a ratio between an intensity of the anti-Stokes band and an intensity of the Stokes band; and using the calculated ratio to determine a temperature being sensed in the fiber optic cable; wherein the fiber optic cable comprises, from the center to the periphery; a central core having a refractive index that decreases progressively from a center of the central core to an edge of the core, wherein the refractive index follows an alpha profile; wherein a bandwidth-length product of the multimode optical fiber has a value greater than 2000 MHz-km at 1550 nm.

Joint wavelet denoising for distributed temperature sensing

Aspects of the present disclosure describe systems, methods, and structures for distributed temperature sensing that employ joint wavelet denoising to achieve desirable signal-to-noise ratio(s) over extended sensor fiber distances.

Extending Fiber Optic Sensing

A system for downhole measurements. The system may comprise a fiber optic cable that further comprises a transmission fiber and a return fiber. Additionally, the system may comprise a passive optical device optically connected to the transmission fiber and the return fiber, a first wavelength division multiplexer (WDM) optically connected to the transmission fiber, and a second WDM optically connected to the return fiber. The system may further comprise a transmitter and a first Raman pump optically connected to the first WDM and a receiver and a second Raman pump optically connected to the second WDM.

Determination device, determination method, and determination program

A determination device equipped with: a model creation unit that creates a standard model of a sensor detection value; a determination unit that determines whether the time from a prescribed point in time until the deviation between the standard model and the sensor detection value exceeds a threshold value is shorter than a prescribed time; and an output unit that outputs a signal associated with an abnormality when the time is determined to be shorter.

Fiber optic temperature sensor

Distributed optical fiber Raman temperature sensor (DOFRTS) with self-correction of dispersion and loss spectra

本发明公开的色散与损耗光谱自校正分布式光纤拉曼温度传感器，包括用电子开关来切换的双拉曼位移波长的双光纤脉冲激光器、测温光纤、集成型光纤波分复用器、直接检测系统、信号采集处理系统和显示器。它是基于光纤拉曼散射测温原理、色散与损耗光谱自校正方法和光时域反射原理，采用双拉曼位移波长的双光源，它的主光源的光纤背向反斯托克斯拉曼散射峰的中心波长与副光源的光纤背向斯托克斯拉曼散射峰中心波长相重合并扣除单程光纤瑞利散射光时域反射信号，对光纤色散与损耗光谱进行自校正，也可以自校正在现场使用的测温光纤、光缆由于弯曲和受压拉伸而造成的随机损耗。该传感器成本低、结构简单、信噪比好，运行可靠。

Optical fiber temperature and stress sensing system based on noise modulation and measuring method

本发明公开了一种基于噪声调制的光纤温度、应力传感系统，包括半导体激光器（1）、第一电光调制器（2）、1×3光纤耦合器（3）、第一光环行器（4）、第一双向半导体光放大器（5）、第二电光调制器（6）、第二光环行器（7）、第二双向半导体光放大器（8）、1×2光开关（9）、波分复用器（10）、雪崩光电探测器（11）、第一光电探测器（12）、第二光电探测器（13）、数据采集卡（14）、计算机（15）、三芯传感光纤（16）、脉冲调制器（17）、20MHz的任意波形发生器（18）、恒温槽（19）。本发明利用应力变化时由传感光纤损耗变化所引起的瑞利散射强度变化进行检测，以及拉曼散射光强对温度敏感的特点，同时实现光纤沿线温度。

Distributed optical fiber sensing system for simultaneously measuring temperature, strain and vibration

本发明公开了一种温度、应变、振动同时测量的分布式光纤传感系统，该系统包括：扫频激光器、光耦合器、光纤延时线、平衡光探测器、脉冲激光器、光隔离器、光纤环形器、带通滤波器、波分复用器、单通道光电探测器、双通道光电探测器、数据采集卡、单模传感光纤。本系统中，温度传感单元与振动传感单元共用所述脉冲激光器，扫频激光器为应变传感单元提供光源，两个光源通过光耦合器相连；波分复用器分别连接光耦合器与传感光纤。本发明传感系统提高了传感系统对环境监测的全面性，具有更高的实用价值。

Distributed fiber optic temperature and strain detecting method based on Raman scattering

一种基于拉曼散射的分布式光纤温度及应变检测方法，包括如下步骤：（1）、搭建分布式光纤温度及应变传感系统；分布式光纤温度及应变传感系统包括拉曼信号采集仪、第一高精度恒温槽（9）、第二高精度恒温槽（10）、待测光纤（11）、第一温度传感器（12）、第二温度传感器（13）；所述拉曼信号采集仪包括脉冲激光器（1）、WDM（2）、第一APD（3）、第二APD（4）、第一LNA（5）、第二LNA（6）、数据采集卡（7）、计算机（8）。本发明设计合理，融合光纤拉曼散射和光时域反射原理的光路、电路和信号采集与处理技术，形成一种新型的基于拉曼散射的温度、应变分布式光纤传感检测方法。

Multimode optical fiber, application thereof and temperature measurement system

本发明公开了一种多模光纤、其应用及测温系统。所述多模光纤包括芯层和包覆在其外的包层；所述芯层半径为23.75～26.25μm，芯层折射率剖面为渐变型折射率分布，折射率分布指数α为1.80～1.89，芯层相对折射率差值△1％为1.0％～1.15％，其熔接损耗小于或等于0.08dB。其应用于中长距离分布式测温系统，所述系统测温距离达到10km至27km。所述系统包括脉冲光源、波分复用器、雪崩二极管、数据采集装置、上位机以及所述的测温多模光纤。本发明提供的多模光纤测温空间分辨率强、测温精度高、距离长。本发明提供的测温系统，结构简单,信噪比高,结果精确。

Bullet tank strain and temperature intelligent monitoring system and method based on distributed optical fiber

本发明提供了一种基于分布式光纤的子弹罐应变和温度智能监测系统及方法，通过在子弹罐体表面布设分布式应变、温度光缆，在子弹罐体下方土层中布置压力计，进而实现对子弹罐体表面及周围状态进行监测，检测数据通过采集器汇总后传递至现场控制系统，现场控制系统还分别与数值模拟系统以及中控显示屏进行数据通信。数值模拟系统利用有限元软件对子弹罐体与下方土层进行模拟仿真，确定相应的温度和应力变化范围，传输给现场控制系统，基于此与检测数据进行对比，实现监测预警，同时构建出子弹罐体表面状态的云图，精确定位发生状况的区域，有效解决现有监测方法无法对罐体本身安全隐患进行预防的问题。

Temperature distribution measuring device and temperature distribution measuring method

【課題】光ファイバの全長の変化に応じて適切な伝達関数を容易に設定できる温度分布測定装置及び温度分布測定方法を提供する。【解決手段】温度分布測定装置２０は、光ファイバ２４に光学的に接続されるレーザ光源２１と、光ファイバ２４内で後方散乱した光を検出する光検出器２６と、光検出器２６の出力から得られる仮の測定温度分布に対し伝達関数を用いた補正計算を行って真の測定温度分布とする温度分布測定部２７とを有する。また、温度分布測定部２７は、光ファイバ２４の全長毎及び長さ方向の位置毎に設定された伝達関数のデータを記憶している。そして、温度分布測定部２７は、光ファイバ２４の長さが変更されると、伝達関数のデータを用いて補正計算に使用する伝達関数を変更する。【選択図】図１ A temperature distribution measuring apparatus and a temperature distribution measuring method capable of easily setting an appropriate transfer function according to a change in the total length of an optical fiber. A temperature distribution measuring device includes a laser light source that is optically connected to an optical fiber, a light detector that detects backscattered light in the optical fiber, and an output of the light detector. A temperature distribution measuring unit 27 that performs a correction calculation using a transfer function on the temporary measured temperature distribution obtained from the above to obtain a true measured temperature distribution. Further, the temperature distribution measuring unit 27 stores transfer function data set for each total length of the optical fiber 24 and for each position in the length direction. Then, when the length of the optical fiber 24 is changed, the temperature distribution measurement unit 27 changes the transfer function used for the correction calculation using the transfer function data. [Selection] Figure 1

A kind of current-carrying capacity of cable monitoring method and system based on distributed optical fiber temperature measurement technology

本发明公开了一种基于分布式光纤测温技术的电缆载流量监测系统，包括信号处理主机，测温光纤，载流量计算服务器，信号处理主机分别与载流量计算服务器和测温光纤相连接，测温光纤缠绕于被测电缆表面。本发明测温光纤环绕于电缆表面至少一圈，可以精确获取电缆横向和纵向各部分的温度信息，以解决传统热电偶法测量的精度较差，只能测量线路的局部温度的问题；本发明采用分布式光纤测温技术和传热学数值计算结合的方法，由电缆表面温度推导电缆的载流量，以解决热电偶法不能通过数据完全计算出电缆的实时载流量、IEC60287标准计算法只能满足简单场景下的载流量计算以及计算误差较大的问题。

Method for improving spatial resolution of distributed Raman temperature measurement of double-width pulse optical fiber

本发明涉及一种双宽度脉冲光纤分布式拉曼测温空间分辨率提升方法，包括以下步骤：S1、分别将两个脉冲宽度为W和W+ΔW的激光射入光纤中，分别获得两组脉冲激光光纤背向散射的stokes光信号和反stokes光信号；S2、根据探测到的stokes信号和反stokes信号计算获得对应脉冲宽度空间分辨率下的分布式温度T w 和T w+△w ；S3、通过S2步骤所获得的对应空间分辨率下的分布式温度T w 和T w+△w ，可计算获得以ΔW脉冲宽度下空间分辨率的分布式温度T △w ： 通过本发明的方法，可以在不减少脉冲宽度和模拟响应时间的情况下，既保证了检测端的信号大小，同时又保证了空间分辨率得以提升。

Methods and devices for standoff differential Raman spectroscopy with increased eye safety and decreased risk of explosion

A compact, portable Raman spectrometer makes fast, sensitive standoff measurements at little to no risk of eye injury or igniting the materials being probed. This spectrometer uses differential Raman spectroscopy and ambient light measurements to measure point-and-shoot Raman signatures of dark or highly fluorescent materials at distances of 1 cm to 10 m or more. It scans the Raman pump beam(s) across the sample to reduce the risk of unduly heating or igniting the sample. Beam scanning also transforms the spectrometer into an instrument with a lower effective safety classification, reducing the risk of eye injury. The spectrometer's long standoff range automatic focusing make it easier to identify chemicals through clear and translucent obstacles, such as flow tubes, windows, and containers. And the spectrometer's components are light and small enough to be packaged in a handheld housing or housing suitable for a small robot to carry.

System for monitoring temperature based on railway tunnel communication optical cable

本发明提供了一种基于铁路隧道通信光缆的温度监测系统。所述基于铁路隧道通信光缆的温度监测系统利用隧道光纤作为温度传感器，并包括：沿激光传播方向依次设置的激光源、耦合器和测温光纤，以及用于对所述激光源发出的调制激光进行放大处理的第一光电通道、用于对所述耦合器反馈的散射回波进行分离放大的第二光电通道和用于进行光电信号采集和处理的信号采集处理单元；所述第一光电通道与所述激光源相连接，所述第二光电通道与所述耦合器相连接，所述信号采集处理单元分别与所述第一光电通道和所述第二光电通道相连接。

Customized distributed amplification for fiber sensing

一种在光纤感测系统中提供在线拉曼放大的方法，其包括以下过程：生成具有探测波长的探测光；将所述探测光发射到光纤中；以相应泵浦波长生成至少一种拉曼泵浦光，所述泵浦波长比所述探测波长短；以相应种子波长生成至少一种拉曼种子光，所述种子波长在所述泵浦波长和所述探测波长之间；将所述拉曼泵浦光发射到所述光纤中；将所述拉曼种子光发射到所述光纤中；以及沿着所述光纤传播所述拉曼泵浦光、所述拉曼种子光和所述探测光，以实现由所述探测光沿着所述光纤传播时产生的信号光的分布式拉曼放大。

Corrected dts measurements based on raman-stokes signals

Methods and apparatus allowing distributed temperature sensing (DTS) measurements to be compensated for differential and/or varying loss between Raman Stokes and anti-Stokes signals are provided. By irradiating an optical waveguide with signals at wavelengths at or near the Raman Stokes and anti-Stokes bands, a distributed loss profile for the waveguide may be generated. This distributed loss profile may be used to adjust the amplitudes or amplitude ratios of Raman Stokes and anti--Stokes signals used in DTS measurements, which may lead to more accurate DTS profiles.

Dangerous material goods yard fire monitoring method and system

本发明涉及仓库货位管理技术领域，公开一种危险品货位火灾监测方法及系统，以基于光纤的拉曼散射实现对危险品货位火灾的精密监测。本发明方法包括：将同一测温环上的各采样点置于外部温度相同的定标环境下求解测温环的补偿参数；然后在实际检测环境下，采集同一所述测温环上各采样点的斯托克斯光与反斯托克斯光功率数据；根据所述斯托克斯光与反斯托克斯光功率数据计算各所述采样点的测量温度；根据各所述采样点的测量温度拟合距离‑温度曲线，根据拟合的距离‑温度曲线得到所述测温环长度范围内的最大温度值；根据定标所确定的所述补偿参数对当前拟合的最大温度值进行补偿得到与所述测温环相对应货位的实际温度。

Optical fiber temperature distribution measuring device

Tailor distributed amplification for fiber sensing

A method of providing in-line Raman amplification in an optical fiber sensing system, including the procedures of generating a probe light having a probe wavelength, transmitting the probe light into an optical fiber, generating at least one Raman pump light at a respective pump wavelength, the pump wavelength being shorter than the probe wavelength, generating at least one Raman seed light at a respective seed wavelength, the seed wavelength being between the pump and probe wavelengths, transmitting the Raman pump light into the optical fiber, transmitting the Raman seed light into the optical fiber and propagating the Raman pump light, the Raman seed light and the probe light along the optical fiber to achieve distributed Raman amplification of signal light produced by the probe light as it propagates along the optical fiber.

Optical fiber temperature distribution measuring device

There is provided all optical fiber temperature distribution, measuring device which measures a temperature distribution along an optical fiber (3) using backward Raman scattering light generated in the optical fiber. The device includes: a reference temperature thermometer (11) disposed in the vicinity of the optical fiber so as to measure a reference temperature (T1, T2) of the optical fiber; an arithmetic controller (7) that calculates a temperature (T) of the optical fiber based on the backward Raman scattering light; and a temperature corrector (12) that corrects the calculated temperature (T) based on a correction formula containing the reference temperature as a parameter.

METHOD FOR MONITORING THE THERMO-MECHANICAL BEHAVIOR OF A SUBSEA PIPE FOR TRANSPORTING PRESSURIZED FLUIDS

A invenção refere-se a método de monitoramento do comportamento termomecânico de cano submarino (2) para transportar fluido sob pressão realizado pela montagem dos elementos unitários de cano (4), compreendendo determinar característica mecânica específica para cada elemento unitário de cano, por meio de cabo de medição (16) possuindo sensor de fibra óptica (retroespalhamento Brillouin) para medir deformação experimentada pelo elemento unitário de cano enquanto submetido em terra a tensões mecânicas em direções e magnitudes predeterminadas ; estabelecer matriz de rigidez associada à característica mecânica de cada elemento unitário de cano; determinar característica térmica específica para cada elemento unitário de cano - medir mudanças térmicas do elemento unitário de cano enquanto submetido em terra a potências de aquecimento elétrico-; estabelecer função de transferência térmica associada à característica térmica de cada elemento unitário de cano; monitorar a recuperação das variações no sinal óptico injetado nos sensores com o cano em serviço; determinar alteração nas características termomecânicas de cada elemento unitário de cano. The invention relates to a method of monitoring the thermomechanical behavior of a submarine pipe (2) for transporting fluid under pressure carried out by assembling the unitary elements of the pipe (4), comprising determining the specific mechanical characteristic for each unitary element of the pipe, by means of measuring cable (16) having fiber optic sensor (Brillouin backscatter) for measuring deformation experienced by the unitary pipe element while subjected to mechanical stresses in predetermined directions and magnitudes on land; establish a stiffness matrix associated with the mechanical characteristic of each single element of the pipe; determine specific thermal characteristic for each unitary pipe element - measure thermal changes of the unitary pipe element while subjected to electrical heating powers on land-; establish ...

A kind of fiber raman scattering light is used for districution temperature and fiber grating while demodulating system and method

一种光纤拉曼散射光用于分布温度与光纤光栅同时解调系统及方法，属于光纤传感技术领域。该系统包括激光光源、光源驱动电路、窄带滤光片、测温光纤、光纤光栅传感器、拉曼波分复用器、光探测器模块、微型光纤光谱仪、信号采集与处理电路和计算机。激光光源在光纤中产生的后向自发拉曼散射光被拉曼波分复用器滤出后用于分布温度测量，前向自发拉曼散射光被光纤光栅反射后用于温度或者应变测量。用于分布温度解调的后向拉曼散射光谱范围和用于光纤光栅解调的前向拉曼散射光谱范围互不重叠，使分布温度与光纤光栅同时解调且互不影响。本发明实现新型的分布温度/光纤光栅一体化解调仪器设计，为温度、应变等多参量同时测量提供更具竞争力的技术方案。

Monitoring internal parameters of electrical motorsystems.

A process and system for measuring and monitoring data, such as temperature and vibrations, in an electrical motor comprises a fibre optical cable (5) embedded in the electrical insulation (4) of at least one wire (3) of the motor windings which cable thus forms an elongate thermometer and/or vibration sensor.

Monitoring internal parameters of electrical motor systems

在电机中测量和监测数据比如温度和振动的方法和系统包括嵌入在电机绕组的至少一根电线(3)的电绝缘(4)中的光缆(5)，该光缆由此形成了细长的温度计和/或振动传感器。

Chaotic laser-related fully distributed optical fiber raman and rayleigh photon sensor

A chaotic laser-related fully distributed optical fiber Raman and Rayleigh photon sensor, which is based on a chaotic laser-related principle and an optical fiber Rayleigh and Raman fusion scattering sensing principle, and uses an optical time domain reflection principle to perform positioning of a measuring point. The sensor employs an optical pulse sequence of a chaotic laser and fluctuating randomly on a time domain, and, by correlation processing a backward probing light of a sensing optical fiber and a local reference light, allows for improved spatial resolution of the sensing system, for effectively increased number of photons of an incident fiber, for improved signal-to-noise ratio of the sensing system, for improved measurement length and measurement precision of the sensing system, and for simultaneous measurement of onsite deformation and cracking while measuring onsite temperature, while not intersecting mutually. The sensor is provided with characteristics of low costs, extended service life, simple structure, special resolution of 15 cm in height, and great signal-to-noise ratio, and is applicable in petrochemical pipelines and tunnels measured within a range of 30 kilometers, in large-scale civil engineering project monitoring, and in disaster prediction monitoring.

Determination device, determination method, and determination program

A determination device includes: a model generator configured to generate a reference model of a sensor detection value; a determiner configured to determine whether a time from a predetermined point in time until a deviation between the reference model and the sensor detection value exceeds a threshold is shorter than a predetermined time; and an outputter configured to output a signal associated with an abnormality when the time is determined to be shorter.

A kind of high-precision optical fiber composite cable intelligent monitoring platform

本发明属于煤矿防火防爆、火灾预警安全监测领域，是保护光纤复合电缆安全运行的关键所在，涉及一种高精度光纤复合电缆智能监控平台，包括分布式光纤测温系统、电缆加热温度控制系统、光纤测温校准系统、局部放电在线监测系统、数据交换系统以及上位机。一种智能监控平台集分布式光纤测温系统、电缆加热温度控制系统、光纤测温校准系统、局部放电在线监测系统以及数据交换系统于一体，克服现有技术的不足，充分发挥该平台安全可靠性好、测温与定位精度高、抗电磁干扰能力强、实时连续大范围地监测光纤复合电缆的运行温度及局部放电等优势，最大地发挥光纤复合电缆的传输能力，降低运行成本，实现工程安全应用与实验模拟及精确预测的多元化目标。

Running water pipe leakage detection experiment platform based on optical fiber Raman temperature sensor

本发明公开了一种基于光纤拉曼温度传感器的自来水管泄漏检测实验平台，它包括：水循环系统、信号放大系统和光纤拉曼温度传感器，通过水循环系统使得在实验室环境下模拟城市自来水管泄漏情况，并通过在检测管道外部设置的转换层将温度信号进一步放大，以便于光纤拉曼温度传感器的检测，本发明对于进一步设计水管泄漏报警系统和改进光纤拉曼温度传感器具有重要意义，并为光纤拉曼温度传感器的应用创造了条件。

Dispersion and loss spectrum self-calibration distributed optical fiber raman temperature sensor

A dispersion and loss spectrum self-calibration distributed optical fiber Raman temperature sensor has a dual Raman displacement wavelength dual fiber pulsed laser module consisting of a drive power supply (11), an electronic switch (12), a primary laser (13) and a secondary laser (14), a first combiner (15), a bidirectional coupler (16), a multimode fiber (17), an integrated optical fiber wavelength division multiplexer (18), a second combiner (19), a direct detection system (20), a signal collection and processing system (21) and a display (22). The sensor uses two light sources that have two Raman wavelength shift, wherein the optical fiber backward anti-Stokes Raman scattering peak centre wavelength of the primary light source and the optical fiber backward Stokes scattering peak centre wavelength of the secondary light source are coincided, and the time domain reflection signal of the one-way optical fiber Rayleigh scattering is deducted. Based on the optical fiber Raman scattering temperature-measurement principle, the dispersion and loss spectrum self-calibration method and the optical time domain reflection principle, the optical fiber dispersion and the loss spectrum can be self-calibrated, and the random loss of the temperature-measurement optical fiber and the optical cable used on site caused by bending and pressed stretching can also be self-calibrated.

Method and apparatus for determining proper curing of pipe liners using distributed temperature sensing

The present invention relates to methods and apparatus utilizing distributed temperature sensing (DTS) to monitor the temperature of a cured-in-place pipe liner to determine if proper curing temperatures and times are achieved. More particularly, an optical fiber is placed between the pipe and the liner running the entire length of the liner. The optical fiber is coupled to a DTS unit. During curing of the liner, the DTS unit sends light pulses down the fiber from one end and detects the characteristics and time delay of light backscattered to the unit. The characteristics are indicative of the temperature of the optical fiber, while the delay is indicative of the round trip time of the light within the fiber, and thus the distance from the DTS unit from which any particular backscatter signal originated.

Demodulation method of distributed Raman fiber sensing system

本发明公开了一种分布式拉曼光纤传感系统的解调方法,其包括以下步骤：A：将传感光纤接入拉曼传感系统，获取传感光纤散射回来的斯托克斯光信号和反斯托克斯光信号分别是 和 B：将定标光纤接入拉曼传感系统，在恒温T 0 状态下进行定标，可获得恒温状态下的拉曼散射信号： 和 进一步推导解调公式 C：记录传感光纤某任意固定点L 1 的温度值T 1 和另一个任意固定点L 2 的温度值T 2 代入解调公式以求解解调公式的待定参数M和N，本发明解决了定标光纤和传感光纤不一致时拉曼传感系统进行精确可靠的温度监测问题，进一步提高了传感系统的实用性。

The method that distributed spontaneous Raman scattering temperature sensor operating distance is improved based on multi-wavelength polarised light

本发明公开了一种基于多波长偏振光提高分布式自发拉曼散射温度传感器工作距离的方法，包括以下步骤：将多波长正交的偏振光通过偏振合束器和多波长偏振合束器输出到拉曼波分复用器，并通过拉曼波分复用器的公共输出端口输出到传感光缆；多波长偏振光在传感光缆中产生反向的斯托克斯光和反斯托克斯光；反向的斯托克斯光和反斯托克斯光经过拉曼波分复用器进入雪崩光电二极管的输入端，经过其进行光电转换和放大；放大后的信号通过数据采集卡同步采集数据；采集的数据通过解调算法单元进行解调，以解调出温度信息。本发明可使分布式自发拉曼散射温度传感器能够承载的最大光功率提高多倍，从而可以延长传感器工作。

Fully-distributed optical fiber sensor for optical fiber Raman frequency shifter fused with Raman amplification effect

本发明公开了一种融合拉曼放大效应的光纤拉曼频移器的全分布光纤传感器，该传感器用一只1550nm光纤脉冲激光器通过光纤分路器分成两束光，一束光经光纤拉曼频移器转换为宽光谱的斯托克斯拉曼光进入传感光纤，另一束光经过延时光纤后与宽光谱斯托克斯拉曼光通过光纤合路器进入同一根传感光纤，两束光在传感光纤相遇处通过非线性相互作用融合，获得一束被拉曼放大的1660nm宽光谱带脉冲激光作为全分布光纤传感器的光源，传感光纤中产生的带有温度信息的1550nm宽光谱反斯托克斯拉曼光通过光纤窄带反射滤光器扣除1550nm激光器瑞利散射光后与带有应变信息的1660nm瑞利光，进入光电接收模块，数字信号处理器和工控机，经解调后获得传感光纤上的温度、应变信息。适用于远程60公里范围内石化管道，隧道，大型土木工程监测和灾害预报监测。

Optical fiber temperature distribution measurement device and method of measuring optical fiber temperature distribution

An optical fiber temperature distribution measurement device configured to receive Raman back scattering lights obtained by inputting a pulsed light into an optical fiber and to measure a temperature distribution along a longitudinal direction of the optical fiber is provided. The device includes a first filter device. The first filter device includes: a threshold value setting circuit configured to set a threshold value in accordance with a change in an amount of noise overlapped with a measured signal, the measured signal indicating one of an intensity distribution and a temperature distribution of the Raman back scattering lights along the longitudinal direction of the optical fiber; a filter configured to eliminate a frequency component of the measured signal, the frequency component being larger than a predetermined first frequency; a determination circuit configured to determine if the measured signal is over the threshold value; a synthesizing circuit configured to select and synthesize one of the measured signal processed by the filter and the measured signal unprocessed by the filter in accordance with a determination result from the determination circuit.

Apparatus and method for sensing temperature

Disclosed are an apparatus and a method for sensing temperature. According to an embodiment of the present invention, the apparatus for sensing temperature comprises: a light generator to change the frequency of incident light including a pulse signal and allow the incident light to enter a sensing optical fiber; a Bragg grating structure included at a first position of the sensing optical fiber; a light circulator to allow the incident light to pass therethrough, and transfer output light returning from the sensing optical fiber to a light filter; the light filter to separate stokes light, anti-stokes light, and Bragg reflection light from the output light; and a signal processor to determine a first temperature of the first position based on the stokes light and the anti-stokes light, determine a second temperature of the first position based on the Bragg reflection light, and compare the first temperature and the second temperature to correct a temperature error of a second position of the optical fiber. The output light includes scattering light by Raman scattering and the Bragg reflection light created as light of the Bragg wavelength in the incident light is reflected by the Bragg grating structure.

Aluminum Doped Optical Fiber

According to one example of the invention an optical fiber comprises: (i) a core consisting of Al doped silica having a first index of refraction n 1 ; (ii) at least one silica based cladding surrounding the core and having a second index of refraction n 2 , such that n 1 >n 2 ; (iii) a hermetic carbon based coating surrounding said cladding, said hermetic coating being 300 nm-1000 nm thick; and (iv) a second coating surrounding said hermetic coating, said second coating being 5 μm to 80 μm thick.

Optic fiber distributed temperature sensor system with self-correction function and temperature measuring method using thereof

本发明对使用一个光源和光检测器测量自动校正温度是有效的。

Method for performing temperature calibration on scene of pipeline leakage monitoring

本发明提供了一种在管道泄漏监测现场进行温度标定的方法，为在待测传感光缆全链路上选取标定点，对标定点依次进行单点温度标定，每个标定点得到一组实测温度值和一组标准温度值；读取待测传感光缆全链路后向拉曼散射光曲线数据，并以标定点为端点分段进行多项式拟合，获取区段趋势项函数，根据所述区段趋势项函数，导入各标定点标准温度值，完成待测传感光缆所有点的温度标定；整合生成传感光缆全链路温度标定表。填补DTS工程现场温度标定的空白，实际应用证明了本发明方法的可操作性、便捷性，具有很高的实用价值。

Method for monitoring the thermomechanical behavior of a submarine conduit for transporting pressurized fluids

Optical fiber temperature distribution measuring device

There is provided all optical fiber temperature distribution, measuring device which measures a temperature distribution along an optical fiber (3) using backward Raman scattering light generated in the optical fiber. The device includes: a reference temperature thermometer (11) disposed in the vicinity of the optical fiber so as to measure a reference temperature (T1, T2) of the optical fiber; an arithmetic controller (7) that calculates a temperature (T) of the optical fiber based on the backward Raman scattering light; and a temperature corrector (12) that corrects the calculated temperature (T) based on a correction formula containing the reference temperature as a parameter.

Optical fiber temperature distribution measuring device

An optical fiber temperature distribution measuring device includes: an optical fiber as a sensor; a light source for outputting, to the optical fiber, signal light which has been amplified by excitation light; a temperature distribution calculation unit for measuring a temperature distribution along the optical fiber by using backward Raman scattered light from the optical fiber; an ASE light intensity variation measurement unit for measuring an intensity variation of an ASE light generated at the light source; and a temperature distribution correction unit for correcting the temperature distribution based on a measurement result of the ASE light intensity variation measurement unit.

Extending a range of an optical fiber distributed sensing system

Embodiments are directed to a distributed temperature sensing system. The system includes a first fiber optic cable and a second fiber optic cable. A first coupler is coupled to the first fiber optic cable. A second coupler is coupled to the second fiber optic cable. An optical isolator coupled between the first coupler and the second coupler to remove a Stokes signal in order to increase the range of the distributed temperature sensing system.

Method for increasing working distance of distributed spontaneous Raman scattering temperature sensor based on multi-wavelength polarized light

本发明公开了一种基于多波长偏振光提高分布式自发拉曼散射温度传感器工作距离的方法，包括以下步骤：将多波长正交的偏振光通过偏振合束器和多波长偏振合束器输出到拉曼波分复用器，并通过拉曼波分复用器的公共输出端口输出到传感光缆；多波长偏振光在传感光缆中产生反向的斯托克斯光和反斯托克斯光；反向的斯托克斯光和反斯托克斯光经过拉曼波分复用器进入雪崩光电二极管的输入端，经过其进行光电转换和放大；放大后的信号通过数据采集卡同步采集数据；采集的数据通过解调算法单元进行解调，以解调出温度信息。本发明可使分布式自发拉曼散射温度传感器能够承载的最大光功率提高多倍，从而可以延长传感器工作。

Pipeline predicting abnormality method and device based on fiber raman scattering light

本发明公开了一种基于光纤拉曼散射光的管道异常预测方法及装置，其中，所述方法包括：固定在管道上的探测器探测固定在管道上的光纤的拉曼散射光信号，并对获得的拉曼散射光信号进行标记；探测器将标记的拉曼散射光信号发送至无线数据传输终端；无线数据传输终端将接收到标记的拉曼散射光信号发送至数据处理中心；数据处理中心根据标记的拉曼散射光信号计算与标记对应的光纤点的温度，获得标记点对应的光纤温度；数据处理中心根据标记点对应的光纤温度进行管道状态异常分析，并将分析出来的管道异常结果向管理用户反馈。在本发明实施例中，在管道壁上信号进行采集，将采集信号上传至数据中心并分析，进行管道异常预测，方便对深埋地下的进行管理。

Determination device, determination method, and determination program

判定装置は、センサ検出値の基準モデルを作成するモデル作成部と、所定の時点から、前記基準モデルと前記センサ検出値との乖離度が閾値を超えるまでの時間が所定の時間よりも短いか否かを判定する判定部と、短いと判定された場合に異常に係る信号を出力する出力部と、を備える。 The determination device includes a model creation unit that creates a reference model of a sensor detection value, and whether a time from a predetermined time point until a deviation degree between the reference model and the sensor detection value exceeds a threshold is shorter than a predetermined time A determination unit that determines whether or not, and an output unit that outputs a signal related to abnormality when it is determined to be short.

A kind of data center's system for detecting temperature and its detection method

本发明公开了一种数据中心温度检测系统及其检测方法，包括测温主机和处于数据中心被测区域的待测设备，待测设备包括若干服务器和测温光纤，测温光纤铺设穿过若干服务器设备内部，用以保证所测温度能最真实反映服务器设备运行的温度；测温主机包括依次连接的激光器、波分复用器WDM、光学滤波器、光电转换器、放大电路、高速数据采集卡、工控机、监控系统和报警器。本发明综合利用光纤拉曼散射效应和光时域反射测量技术来实时测量光纤沿线空间温度分布情况，可实现对任意指定测量点进行实时精确的温度信息采集。光纤测温灵敏、实时，通过监控系统可以实时将光纤沿路的温度显示出来，得出温度分布图，直观有效。

The joint Raman of both-end detection and the distribution type optical fiber sensing equipment of Brillouin scattering

本发明公开了一种双端探测的联合拉曼和布里渊散射的分布式光纤传感装置，其特征在于：包括微波信号源、DFB激光器、第一光纤耦合器、第二光纤耦合器、第一电光调制器、第二电光调制器、光栅滤波器、第一掺饵光纤放大器、第二掺饵光纤放大器、第三掺饵光纤放大器、第一光开光、第二光开关、第三光开关、扰偏器、脉冲发生器、波分复用器、传感光纤、第一光电探测器、第二光电探测器、光纤环形器、数据采集器及智能装置；该传感装置可同时测量温度和应变，可降低环境变化带来的测量影响，提高系统测量精度、系统可靠性和响应速度。

Decision maker and determination method

判定装置具备：模型创建部，创建传感器检测值的基准模型；判定部，判定从规定的时刻到上述基准模型与上述传感器检测值的分歧度超过阈值为止的时间是否比规定的时间短；以及输出部，在判定为短的情况下输出与异常相关的信号。

Identifying fluid level for down hole pressure control with depth derivatives of temperature

Given a number of temperature measurements, such as from a Distributed Temperature Sensing System (DTS), at various depths in a wellbore, a derivative of temperature with respect to depth can be calculated. A fluid boundary can then be identified where the depths below the boundary corresponds to the presence of fluid and a low fluctuation regime in the derivative of temperature with respect to depth, and the depths above the boundary correspond to the absence of fluid and a high fluctuation regime in the derivative of temperature with respect to depth.

Determination device, determination method, and determination program

【課題】異常の予兆を判定することができる判定装置、判定方法および判定プログラムを提供する。【解決手段】判定装置１００は、センサ検出値の基準モデルを作成するモデル作成部３１と、所定の時点から、前記基準モデルと前記センサ検出値との乖離度が閾値を超えるまでの時間が所定の時間よりも短いか否かを判定する判定部３３と、短いと判定された場合に異常に係る信号を出力する出力部３４と、を備える。【選択図】図５

Attenuation correction for distributed temperature sensors using antistokes to rayleigh ratio

A distributed temperature sensor, a method of determining temperature, and a processing system to compute temperature are described. The sensor includes an optical fiber disposed in an area where temperature is to be measured, a primary light source to inject light into the optical fiber, and a secondary light source to inject light into the optical fiber. The sensor additionally includes a photo detector to detect backscatter light energy from the optical fiber the backscatter light energy including Stokes Raman scatter or anti-Stokes Raman scatter and primary Rayleigh scatter resulting from the primary light source and secondary Rayleigh scatter resulting from the secondary light source, and a processor to determine temperature based on a ratio of the Stokes Raman scatter or the anti-Stokes Raman scatter and a combination of the primary Rayleigh scatter and the secondary Rayleigh scatter.

Temperature monitoring apparatus

An apparatus to monitor a temperature or temperature characteristic of a vehicle's electrical energy distribution network is disclosed. The apparatus comprises at least one first optical fibre 50, comprising one or more temperature sensing sections, arranged to produce, in response to an optical input signal, an optical output signal indicative of the temperature of the temperature sensing section. One or more of the temperature sensing sections may comprise a fibre bragg grating. The apparatus may comprise optical director components, d1-d8 to direct the optical input signal to, and/or the optical output signal from the plurality of first optical fibres 50. The optical director components may comprise a passive optical splitter or an active optical switch. An optical interrogator 56 may provide the optical input signal to and receive the optical output signal from the temperature sensing sections of the first optical fibre(s) 50 and may determine the temperatures / temperature characteristics. The apparatus may further comprise feeder optical fibre(s) 54. The electrical energy distribution network may be an aircraft electrical energy distribution network comprising a meshed network of nodes n1-n8, links and internode links 111-115 and 11-19 and a management unit UG to control the flow of electrical energy within the network based on the temperature. The management unit may control one or more active nodes using optical control signals transmitted via one or more optical fibres of the temperature monitoring apparatus. Optical director components d1-d8 may be integrated with nodes n1-n8 of the electrical energy distribution network and the first optical fibre(s) 50 may be embedded in links of the electrical energy distribution network. The management unit UG may control the flow of vehicle’s electrical energy within the electrical energy distribution network to reduce or prevent overheating.

Device and method for shipborne measurement of amplitude of isolated wave in ocean

本发明公开了一种船载测量海洋内孤立波振幅的装置与方法，投放后的铠装光纤缆由于浪流作用会倾斜、弯曲，所测温度对应的位置并不是相应的深度，需要确定深度和铠装光纤缆的缆长的函数关系；利用定标温深仪的下降剖面和上升剖面温度及深度数据结合光纤在测量过程的剖面温度值进行深度和缆长的非线性函数关系拟合，利用拟合方程确定铠装光纤缆所测温度和深度的对应关系；由于在测量过程中铠装光纤缆还会上下漂移，利用铠装光纤缆测量温度过程中的定标温深仪数据再进行逐点对测量拟合方程的深度修正；当海洋内孤立波到来时，会使剖面温度变化，利用经过修正后的长时间序列剖面温度数据即可获得内孤立波的振幅。

Clinical thermometer

Cable trench temperature monitoring method and system based on single-mode optical fiber

本发明涉及一种基于单模光纤的电缆沟温度监测方法，应用于电缆沟温度检测系统，所述电缆沟温度检测系统包括与待测电缆同沟设置的单模光纤，所述方法包括：向所述单模光纤耦合预设功率的激光信号以在所述单模光纤中产生拉曼散射光；接收所述拉曼散射光，并对接收的所述拉曼散射光进行解调分离以获取携带温度信息的反斯托克斯散射光；根据所述激光信号和反斯托克斯散射光获取沿所述待测电缆分布的温度信息；当所述待测电缆的温度信息异常时，输出警报信号，可以对长距离待测电缆的温度进行自动监测，可避免了额外铺设多模测温光缆的重复投入和浪费。

The method of distributed optical fiber temperature sensing system and the automatic parameter for obtaining calibration

本发明公开了一种分布式光纤温度传感系统及自动获取标定的参数的方法，系统包括温度解调装置、测温主机和传感光纤，温度解调装置包括电脑和同步控制单元，测温主机包括激光发生器、密集波分复用系统、第一雪崩光电二极管、第二雪崩光电二极管、第一放大器、第二放大器、双通道数据采集卡、第一恒温槽和第二恒温槽，密集波分复用系统分别与激光发生器、第一雪崩光电二极管、第二雪崩光电二极管和第一恒温槽连接，第二恒温槽分别与第一恒温槽和传感光纤连接，第一恒温槽与第二恒温槽存在一定的温差。本发明能有效改善因激光发生器的光衰造成的系统误差、提高稳定性、减少需要定期对系统进行标定的维护工作。

Method for measuring temperature distribution using Raman ???? temperature sensor

본 발명은 광섬유 분포형 온도센서(fiber optic distributed temperature sensor)인 라만 OTDR(Optical Time Domain Reflectometer) 센서의 신호 대 잡음비(signal to noise ratio) 향상 및 온도 측정방법에 관한 것으로, 이전의 OTDR 센서에 비해 넓은 폭을 갖는 입력 펄스(Pulse)를 입사시킴으로써 후방 산란광(Back scattering light)의 세기를 증가시켜 신호 대 잡음비를 향상시킬 수 있도록 한 것이다. 측정되는 후방 산란광의 세기를 미분하여 후방산란광 세기의 기울기를 계산함으로써 거리에 따른 온도분포를 측정할 수 있다. The present invention relates to a signal-to-noise ratio improvement and a temperature measuring method of a Raman Optical Time Domain Reflectometer (OTDR) sensor, which is a fiber optic distributed temperature sensor, compared to the previous OTDR sensor. By injecting a wide pulse input pulse, the intensity of back scattering light is increased to improve the signal-to-noise ratio. By calculating the slope of the backscattered light intensity by differentiating the measured intensity of the backscattered light can be measured the temperature distribution over the distance. 광섬유 분포형 온도센서, 라만 산란, 라만 OTDR, 온도 분포 Optical Fiber Distribution Temperature Sensor, Raman Scattering, Raman OTDR, Temperature Distribution

System and method for distributed temperature measurement in ultra-long optical cable

本发明公开了一种在超长光缆中用于分布式温度测量的系统，包括第一拉曼相干光频域检测系统、第二拉曼相干光频域检测系统、上行单模光纤、下行单模光纤和中继器，所述的上行单模光纤和下行单模光纤两端分别与第一拉曼相干光频域检测系统和第二拉曼相干光频域检测系统连接；第一拉曼相干光频域检测系统和第二拉曼相干光频域检测系统的探测脉冲光在上行单模光纤与下行单模光纤的内部；所述的上行单模光纤和下行单模光纤各个分段内均安装有中继器；解决传统的长距离光纤组的温度测量分辨率低、信噪比损失大，且采用隔离器会造成背向散射信号不能按沿原路返回，以至难以检测散射光信号的问题。

FIBER-OPTIC DISTRIBUTED TEMPERATURE DETECTION OF ANNULAR CEMENT CURING USING A CEMENT BUFFER IMPLANTATION SYSTEM

DETECÇÃO DE TEMPERATURA DISTRIBUÍDA POR FIBRA ÓPTICA DA CURA DE CIMENTO ANULAR USANDO UM SISTEMA DE IMPLANTAÇÃO DE TAMPÃO DE CIMENTO. Um sistema inclui: uma ferramenta de cimentação posicionável dentro de uma coluna de revestimento de um furo de poço; um sistema de detecção de temperatura distribuída (DTS) compreendendo: um cabo de fibra óptica acoplado à ferramenta de cimentação; e um interrogador de DTS posicionável em uma superfície do furo de poço para transmitir um sinal óptico através do cabo de fibra óptica e determinar a partir de um sinal óptico refletido uma pluralidade de temperaturas ao longo do cabo de fibra óptica; uma bobina de fibra para distribuir o cabo de fibra óptica a partir de uma primeira extremidade do cabo de fibra óptica em resposta a uma tensão no cabo de fibra óptica à medida que a ferramenta de cimentação percorre a coluna de revestimento atrás de uma composição de cimento; e um processador em comunicação com o sistema de DTS e configurado para monitorar a pluralidade de temperaturas ao longo do cabo de fibra óptica enquanto a composição de cimento cura. FIBER-OPTIC DISTRIBUTED TEMPERATURE DETECTION OF ANILLARY CEMENT CURING USING A CEMENT BUFFER IMPLEMENTATION SYSTEM. One system includes: a cementing tool positionable within a wellbore casing string; a distributed temperature sensing system (DTS) comprising: a fiber optic cable coupled to the cementing tool; and a DTS interrogator positionable on a surface of the wellbore for transmitting an optical signal through the fiber optic cable and determining from a reflected optical signal a plurality of temperatures along the fiber optic cable; a fiber spool for distributing the fiber optic cable from a first end of the fiber optic cable in response to a tension in the fiber optic cable as the cementing tool travels down the casing column behind a cement composition ; and a processor communicating with the DTS system and configured to monitor the plurality of temperatures along the fiber ...

Optic fiber distributed temperature sensor system with self- correction function and temperature measuring method using thereof

본 발명은 하나의 광원과 하나의 광검출기를 이용하여 자동보정된 온도를 측정할 수 있는 효과가 있다. 이를 위해 특히, 전원공급부(100)와, 펄스발생기(110)와, 레이저다이오드(105)로 구성되어 펄스 변조된 광신호를 발생시키는 광원부; 광원부에 연결되어 광신호가 입사되어 전송되는 피측정 광섬유(120); 피측정 광섬유(120)의 끝단에 구비되어 피측정 광섬유(120)를 통해 전송된 광신호를 피측정 광섬유(120)를 따라 반사시키는 반사수단(125); 피측정 광섬유(120)와 광원부 사이에 구비되어 피측정 광섬유(120)로부터 입사되는 광신호를 광원부으로부터 입사된 광신호와는 다른 방향으로 분리전송시키는 광순환기(115); 광순환기(115)에 연결되어 광순환기(115)로부터 분리전송된 광신호들 중 안티스톡스 라만산란 광신호만을 분리하여 투과시키는 라만필터(130); 라만필터(130)에 연결되어 안티스톡스 라만산란 광신호를 신호처리 가능한 전기신호로 변화시키는 광검출기(135); 광검출기(135)에 연결되어 변화된 전기신호를 증폭시키는 증폭기(140); 증폭기(140)에 연결되어 증폭된 전기신호를 디지털 형태로 변환하는 디지털변환기(145); 및 디지털변환기(145)에 연결되어 라만효과를 이용하여 온도를 측정함에 따라, 피측정 광섬유(120)의 거리 방향으로 분포된 온도 데이터를 출력하는 신호처리부(150);를 포함하는 것을 특징으로 하는 자동보정 기능을 갖는 광섬유 분포 온도 센서 시스템 및 자동보정된 온도 측정방법이 개시된다. The present invention has the effect of measuring the temperature of the automatic correction using one light source and one photodetector. To this end, in particular, the power supply unit 100, the pulse generator 110, the laser diode 105 is composed of a light source unit for generating a pulse-modulated optical signal; An optical fiber 120 to be connected to the light source unit to transmit and receive an optical signal; Reflection means 125 provided at an end of the optical fiber 120 to reflect the optical signal transmitted through the optical fiber 120 to be measured along the optical fiber 120 to be measured; An optical circulator 115 provided between the optical fiber 120 and the light source unit to separate and transmit an optical signal incident from the optical fiber 120 to be measured in a direction different from the optical signal incident from the light source unit; A Raman filter 130 connected to the optical circulator 115 to separate and transmit only an antistock Raman scattering optical signal among optical signals separated and transmitted from the optical circulator 115; A photodetector 135 connected to the Raman filter 130 for converting an antistock Raman scattering optical signal into an electrical ...

Temperature measurement device, temperature measurement method, and computer-readable non-transitory medium

A temperature measurement device includes: a light source configured to input a light into an optical fiber; a detector configured to detect a Stokes component and an anti-Stokes component from a back scattering light from the optical fiber; a memory; and a processor configured to execute a process, the process comprising: in a predetermined region including a sample point of the optical fiber, calculating a range including the sample point in accordance with a largeness of a correlation between the Stokes component and the anti-Stokes component; smoothing the Stokes component and the anti-Stokes component in the range; and measuring a temperature of the sample point with use of the Stokes component and the anti-Stokes component that are smoothed by the corrector.

Distributed optical fiber temperature measurement algorithm for petroleum horizontal well

本发明公开了一种用于石油水平井的分布式光纤测温算法，由于背向斯托克斯拉曼散射光强与背向反斯托克斯拉曼散射光强之比，只跟温度相关，利用光纤拉曼散射原理及光时域反射原理模拟水平井下测温，由于光纤损耗问题提出了补偿因子进行温度补偿，温度补偿后算法解调出的温度数据更加准确，通过真实水平井数据解调，计算出的温度数据与标准温度数据误差保持在0.40℃(1σ)，验证了本文算法的可靠性。

Method for improving spatial resolution of distributed Raman temperature measurement of double-width pulse optical fiber

本发明涉及一种双宽度脉冲光纤分布式拉曼测温空间分辨率提升方法，包括以下步骤：S1、分别将两个脉冲宽度为W和W+ΔW的激光射入光纤中，分别获得两组脉冲激光光纤背向散射的stokes光信号和反stokes光信号；S2、根据探测到的stokes信号和反stokes信号计算获得对应脉冲宽度空间分辨率下的分布式温度T w 和T w+△w ；S3、通过S2步骤所获得的对应空间分辨率下的分布式温度T w 和T w+△w ，可计算获得以ΔW脉冲宽度下空间分辨率的分布式温度T △w ： 通过本发明的方法，可以在不减少脉冲宽度和模拟响应时间的情况下，既保证了检测端的信号大小，同时又保证了空间分辨率得以提升。

Filter distributed data collection

Eine Vorrichtung (100) zum verteilten Erfassen zur Bestimmung einer physikalischen Größe, die eine Messeinheit (102), die zum Messen von Signalen über Zeit und Raum durch verteiltes Erfassen konfiguriert ist, eine Bestimmungseinheit (118), die zum Bestimmen von Daten, die mit der physikalischen Größe korreliert sind, auf Basis der gemessenen Signale konfiguriert ist, und eine Filtereinheit (104) aufweist, die zum Filtern der Daten konfiguriert ist, um Rauschen zu reduzieren und reale Merkmale im Wesentlichen zu erhalten, basierend auf mindestens einem Filterparameter, der bestimmt wird in Abhängigkeit von den Daten, die sich auf die physikalische Größe bei einer Vielzahl an unterschiedlichen Zeiten beziehen.

Monitoring internal parameters of electrical motor systems

A process and system for measuring and monitoring data, such as temperature and vibrations, in an electrical motor comprises a fibre opti-cal cable (5) embedded in the electrical insulation (4) of at least one wire (3) of the motor windings which cable thus forms an elongate thermometer and/or vibration sensor.

Distributed fiber optic sensing of temperature using a polarization scrambler

Aspects of the present disclosure describe distributed fiber optic sensing (DFOS) systems, methods, and structures that advantageously achieve single mode fiber distributed temperature sensing (DTS) with improved noise characteristics by employing a polarization scrambler in its optical chain.

Measurement of temperature using combination of rayleigh and raman backscatter interferometry

A method of measuring temperatures, includes disposing a carrier in a borehole in an earth formation, the carrier having an optical fiber connected thereto, interrogating the optical fiber with a pulsed optical signal generated by a distributed temperature sensing (DTS) assembly, the pulsed optical signal having a first frequency, and receiving first reflected signals from the optical fiber, estimating an absolute temperature from the reflected signals, interrogating the optical fiber with an at least partially coherent optical signal from a phase sensitive optical time domain reflectometry (?-OTDR) assembly, the at least partially coherent optical signal having a second frequency, and receiving second reflected signals from multiple scattering locations in the optical fiber; estimating a phase difference between the reflected signals, and estimating a temperature change based on the phase difference, and combining the absolute temperature and the temperature change to generate a temperature profile at a location in the borehole.

Calculation type distributed optical fiber sensing method and system

本发明公开了一种计算型分布式光纤传感方法及系统。该方法包括：确定用于调制入射光强度的信号源，信号源为二进制序列；将经信号源调制后的光脉冲作为入射光信号射入光纤；以设定采样率采集经光纤散射后的散射光信号；根据入射光信号和散射光信号，采用基于时域的差分鬼成像协议确定待探测光信号的时域重构图像；根据待探测光信号的时域重构图像确定光纤的传感信号。本发明提供的计算型分布式光纤传感方法及系统具有采样率低、设备复杂度低和成本低的特点。

Distribution type fiber-optic goaf thermometric and high temperature early warning system

本发明公开了分布式光纤采空区测温及高温预警系统，涉及安全监测技术领域，解决了现有的对采空区火灾监测的方法不能预警火灾、分析处理时间较长和无法定位起火位置的问题，其技术方案要点是：包括计算机模块、与计算机模块连接的分布式光纤测温仪、传输光缆和接线盒，所述接线盒通过传输光缆与分布式光纤测温仪连接；所述接线盒设有多个并列设置的检测线路，检测线路包括液压支架、光缆盘和测温光缆；所述光缆盘与液压支架固定连接，测温光缆一端与接线盒连接，另一端与光缆盘缠绕固定，具有实时监测采空区的温度，实现及时煤自燃灾害预警，把握最佳灾害治理时机的作用。

Method and system for sensing distributed temperature using multicore fiber

멀티코어 광섬유를 이용한 분포형 온도 측정 시스템 및 분포형 온도 측정 방법이 개시된다. 본 발명의 멀티코어 광섬유를 이용한 분포형 온도 측정 시스템은, 멀티코어 광섬유를 기존의 분포형 온도감지 시스템(DTSS)에 사용하여, 다수 코어에 의해 후방 산란된 라만 산란광을 모든 코어에 대하여 취합해 신호를 분석함으로써, 코어의 수만큼 신호 크기를 증가시켜, 동일한 측정 시간 동안의 신호대잡음비(SNR)를 향상시키고, 이를 통해 측정 거리를 증가시킬 수 있다.

Temperature strain dual-parameter sensing system and method based on dual-wavelength pulse

本发明公开了一种基于双波长脉冲的温度应变双参量传感系统和方法，具体涉及光纤传感技术领域，所述传感系统包括双波长脉冲光源模块、光纤耦合器、环形器、传感单元模块、波分复用器、滤波模块、可调光衰减器、信号探测与解调模块；所述的双波长脉冲光源模块可输出中心波长可调且强度相同的皮秒脉冲信号，经光纤耦合器分为两束，其中一束作为参考光束；另一束作为探测光束经环形器后入射到传感单元模块，产生的光纤光栅反射光和后向拉曼反斯托克斯散射光经波分复用器分光进入信号探测和解调模块。本发明结合光纤光栅传感和分布式拉曼温度传感，并采用差分探测和单光子探测的方式，既可以同时测量温度和应变信息，又具有系统波长分辨率高和空间分辨率高的特点，从而满足了实际应用中的多种需要。

Optical fiber temperature distribution measurement device and method of measuring optical fiber temperature distribution

An optical fiber temperature distribution measurement device for measuring a temperature distribution along a longitudinal direction of an optical fiber is provided. The device includes: a light transmitter configured to input a train of code-modulated light pulses into the optical fiber; a light receiver configured to receive Raman back scattering lights generated by inputting the train of code-modulated light pulses into the optical fiber; a demodulator configured to perform a correlation processing between a measured signal output from the light receiver and a code string associated with a type of the code modulation performed by the light transmitter, and to demodulate the measured signal; a storage storing a correction data to be used to correct a distortion of the measured signal output from the light receiver when an impulsive pulsed light is output from the light transmitter; and a corrector configured to perform a correction to one of the measured signal output from the light receiver and a demodulated signal output from the demodulator, using the correction data stored in the storage.

Optical fiber temperature distribution measuring apparatus, optical fiber temperature distribution measuring method and optical fiber temperature distribution measuring system

本发明提供光纤温度分布测量装置、光纤温度分布测量方法以及光纤温度分布测量系统。该光纤温度分布测量装置具有：光源，其将脉冲光入射到被测量光纤；信号检测部，其检测出基于上述脉冲光的入射在上述被测量光纤内产生的后方散射光中所包含的规定的光的感光强度；信号处理部，其基于上述规定的光的感光强度，计算出与由上述被测量光纤的氢分子吸收产生的感光强度的变化量相应的值，并基于上述值，修正与上述被测量光纤的温度相应的上述规定的光的感光强度。