Method for measuring incident angle by virtue of linear-frequency-modulated double-beam laser heterodyne

The invention relates to a method for measuring an incident angle by virtue of a linear-frequency-modulated double-beam laser heterodyne, which relates to the field of engineering and solves the problems that the demodulation and modulation of a signal are complex, and the measurement accuracy is low because direction information of a movable reflector is required in an existing angle measurement method. The method is realized based on a device comprising a linear-frequency-modulated laser device, a first reflection mirror, a second reflection mirror, a convergent lens, a plane standard mirror, a photoelectric detector and a signal processing system. The method comprises the steps of receiving a light current I emitted by the photoelectric detector by virtue of the signal processing system in a measurement process, processing the light current I, carrying out Fourier transform to obtain a heterodyne signal frequency fIF in the light current, and obtaining the relation between a refraction ...

Device for measuring torsional pendulum micro impulse through linear frequency modulation multi-beam laser heterodyne and torsional pendulum micro impulse measurement method based on the same

The invention provides a device for measuring torsional pendulum micro impulse through linear frequency modulation multi-beam laser heterodyne and a torsional pendulum micro impulse measurement method based on the device and relates to the technical field of torsional pendulum micro impulse measurement. By the adoption of the device for measuring torsional pendulum micro impulse through linear frequency modulation multi-beam laser heterodyne and the torsional pendulum micro impulse measurement method based on the device, the problem that by the adoption of an existing device and method for measuring torsional pendulum micro impulse, the measurement precision is low is solved. According to the device for measuring torsional pendulum micro impulse through linear frequency modulation multi-beam laser heterodyne and the torsional pendulum micro impulse measurement method based on the device, a laser emitted by a pulse laser device acts on a working medium target, so that plasma spray is generated ...

Precise ore grinding and grading method for magnetic separation tailing titanium resources

The invention discloses an accurate ore grinding and grading method for magnetic separation tailing titanium resources. Fine ore is obtained after magnetic separation tailings are subjected to coarse separation; the fine ore is subjected to first-stage strong magnetic roughing, obtained strong magnetic separation concentrate is graded through a primary cyclone, settled sand of the cyclone enters a ball mill for ore grinding, and overflow of the cyclone and discharged ore of the ball mill are combined and enter a secondary cyclone for grading; overflow of the secondary cyclone enters a high-frequency fine screen to be screened, the oversize part of the high-frequency fine screen and settled sand of the secondary cyclone are combined and enter a tower mill to be subjected to ore grinding again, discharged ore of the tower mill returns to the secondary cyclone to be subjected to closed-loop classification, the undersize part of the high-frequency fine screen is subjected to medium-magnetism ...

Device and method for measuring micro impulse by means of linear frequency modulation multi-beam laser heterodyne quadratic harmonic method and torsional pendulum method

The invention provides a device and method for measuring micro impulse by means of a linear frequency modulation multi-beam laser heterodyne quadratic harmonic method and a torsional pendulum method, and belongs to the field of optics. The device and method are aimed to solve the problems that according to an existing laser interference method for measuring the micro impulse, accidental errors are large and measurement precision is low. Linearly polarized light emitted from a linear frequency modulation laser device is reflected through a first plane reflection mirror and a second plane reflection mirror and then enters a plane standard lens, light beams penetrating through the front surface of the plane standard lens are reflected by the rear surface and the front surface of the plane standard lens in the plane standard mirror for many times, then multiple beams of reflection light are obtained, the beams of reflection light penetrate through the front surface of the plane standard lens ...

Device and method for measuring micro-impulse based on linear frequency modulation multi-beam laser heterodyne quadratic harmonic method and torsional pendulum method

The invention provides a device and method for measuring the micro-impulse based on a linear frequency modulation multi-beam laser heterodyne quadratic harmonic method and a torsional pendulum method, and belongs to the field of optics. The device and the method aim at solving the problems that when the micro-impulse is measured through an existing laser interference method, accidental errors are large and measurement accuracy is low. The device comprises a linear frequency modulation laser device, a first plane mirror, a torsional pendulum system, a pulse laser device, a plane standard mirror, a converging lens, a photoelectric detector and a signal processing system. Laser beams emitted by the pulse laser device and a working medium target act to generate plasma jetting, and a standard beam is made to rotate under the reverse jetting action. Linearly-polarized light passes through the surface of a second plane mirror pasted on the standard beam, the light, transmitted by the front surface ...

Device and method for measuring electrostriction coefficient through linear frequency modulation double-beam laser heterodyne

The invention provides a device and method for measuring an electrostriction coefficient through linear frequency modulation double-beam laser heterodyne and belongs to the field of measurement of the electrostriction coefficient. The device and method aim to solve the problem that by the adoption of an existing electrostriction coefficient measurement method, precision is low. The device comprises a linear frequency modulation laser device, a first plane mirror, a thin glass plate, a second plane mirror, a two-dimensional regulation frame, a convergent lens, a photoelectric detector and a signal processing system. The method comprises the steps that voltage is applied to a measured piezoelectric ceramic tube, the photoelectric detector starts to receive light beam signals, the signal processing system continuously collects light currents output by the photoelectric detector and processes collected difference frequency signals, the current distance between the thin glass plate and the second ...

Device and method for measuring linear expansion coefficient of metal by virtue of linear-frequency-modulation multi-beam laser heterodyne

The invention relates to a device and a method for measuring a linear expansion coefficient of metal by virtue of a linear-frequency-modulation multi-beam laser heterodyne, belonging to the field of the measurement of linear expansion coefficients of materials and solving the problem that measuring errors are too large because more parameters need to be directly measured and the operation is complex in an existing linear expansion coefficient measuring method. According to the device and the method, to-be-measured parameter information is modulated into the frequency difference of heterodyne signals by virtue of a linear frequency modulation technique based on the linear frequency modulation and a laser heterodyne technique, a plurality of to-be-measured parameters can be simultaneously obtained by demodulating the laser heterodyne signals, and the accurate information of the to-be-measured parameters is obtained by virtue of weighted average treatment. The device and the method are applied ...

Device for adopting linear frequency modulation double beam laser heterodyne method and torsional pendulum method to measure micro impulse and measuring method thereof

The invention relates to a device for adopting a linear frequency modulation double beam laser heterodyne method and a torsional pendulum method to measure micro impulse and a measuring method thereof and belongs to the field of micro impulse measurement. The problem that existing devices and methods for micro impulse measurement are low in measurement precision is solved. The linear frequency modulation double beam laser heterodyne method is applied to the micro impulse measurement method, measurement of the micro impulse is converted into measurement of a standard beam torsional pendulum angle, information of the to-be-measured standard beam torsional pendulum angle can be obtained indirectly through the measurement of the thickness of a plane standard lens, measurement accuracy is effectively improved, the measured micro impulse and the incidence angle theta 0 form linear relations when the turning angle is small (smaller than 5 degrees), the measuring error is smaller than 0.52%, the ...

Device and method for measuring angle by virtue of linear-frequency-modulation multi-beam laser heterodyne

The invention relates to a device and a method for measuring an angle by virtue of a linear-frequency-modulation multi-beam laser heterodyne, which solves the problem that an existing precise angle measurement method cannot meet a high-precision angle measurement requirement. According to the device and the method, by utilizing the characteristics of non-contact property, high precision, simple structure and the like of an optical angle gauge, the large-scope dip angle detection can be realized without direction information of a movable mirror simultaneously when the precision is met; the information of a plurality of to-be-measured angles is loaded to the frequency difference of heterodyne signals by virtue of a linear frequency modulation technique according to the high-precision angle measurement requirements in an engineering field and can be simultaneously demodulated by virtue of Fourier transform, and the precision of the to-be-measured angles can be improved by virtue of weighted ...

Cement based barbecuing basin and producing method

A preparation method of water-soluble resin latex in acrylic acid series used for an intestine soluble coating material of medicines

Device for measuring micro-impulse by adopting linear frequency modulation double-beam laser heterodyne method and torsion method and measuring method of device

The invention provides a device for measuring a micro-impulse by adopting a linear frequency modulation double-beam laser heterodyne method and a torsion method, and a measuring method of the device and belongs to the field of micro-impulse measurement. The problem that an existing device and method for measuring the micro-impulse are low in measurement precision is solved. The linear frequency modulation double-beam laser heterodyne method is applied to the micro-impulse measuring method, measurement of the micro-impulse is converted into measurement of the torsion angle of a standard beam, information of the torsion angle of the standard beam to be measured can be obtained indirectly by measuring the incident light refraction angle of a plane standard mirror, and the measurement precision is effectively improved; when the rotating angle is smaller than five degrees, the linear relation between the measured micro-impulse and the incidence angle theta 0 is formed, a measurement error is ...

Device for measuring torsional pendulum micro impulse through linear frequency modulation multi-beam laser heterodyning and torsional pendulum micro impulse measuring method based on device

The invention provides a device for measuring torsional pendulum micro impulse through linear frequency modulation multi-beam laser heterodyning and a torsional pendulum micro impulse measuring method based on the device, and belongs to the field of torsional pendulum micro impulse measurement. The device and method are used for solving the problem that an existing torsional pendulum micro impulse measurement method and device are low in measurement precision. Laser emitted by a pulse laser acts on a working medium target to generate plasma jet, the back jet effect enables a standard beam to rotate, while the standard beam rotates, a linear frequency modulation laser continuously emits linear frequency modulation laser light which is reflected to a plane standard mirror through a first plane mirror and a second plane mirror, the front surface and the rear surface of the plane standard mirror both reflect the linear frequency modulation laser light, the linear frequency modulation laser ...

Device and method for measuring glass thickness through linear frequency modulation multi-beam laser heterodyne

The invention discloses a device and a method for measuring glass thickness through linear frequency modulation multi-beam laser heterodyne and belongs to the technical field of precision glass thickness measurement. The device and the method for measuring the glass thickness through the linear frequency modulation multi-beam laser heterodyne solve the problem that the glass thickness measurement error is large due to the fact that only single to-be-measured parameters are obtained after the existing laser heterodyne signal frequency spectrums are demodulated. Laser emitted from a frequency modulation laser enters into a first reflecting mirror after being reflected through a second reflecting mirror and light beams enter into plain glass after being reflected through the first reelecting mirror; a plurality of beams of reflecting light is obtained after the incident light is reflected by the front surface and the rear surface of the plane glass for a plurality of times; the plurality of ...

Device and method for measuring linear expansion coefficient by use of quadratic harmonic linear frequency-modulation multiple-beam laser heterodyne method

The invention relates to a device and a method for measuring the linear expansion coefficient by use of a quadratic harmonic linear frequency-modulation multiple-beam laser heterodyne method, and belongs to the optics field. The device and the method are used for solving the problems that the error is large and the measurement precision is low when a direct measurement method is adopted for measuring the linear expansion coefficient. The device comprises a linear frequency modulation laser, a thin glass plate, a first plane mirror, a metal wire to be detected, an electrothermal furnace, a convergent lens, a photoelectric detector and a signal processing system; linear polarized light enters the first plane mirror after obliquely penetrating into the thin glass plate at an incident angle of theta 0, and a light beam is reflected and transmitted multiple times between the thin glass plate and the first plane mirror which are parallel, so that the multiple light beams transmitting the thin ...

Special cleaning agent for bearing substituting for coal oil and preparing method thereof

Method of preparing environment-friendly type slag based dried powder coating

Device and method for measuring electrostrictive coefficient by linear frequency modulation multi-beam laser heterodyne quadratic harmonic method

The invention disclose a device and a method for measuring electrostrictive coefficient by a linear frequency modulation multi-beam laser heterodyne quadratic harmonic method, and relates to the technical field of optical measurement. The invention aims to solve the problems that the variation of the axial length generated when voltage is applied on the inner and outer surfaces of a piezoelectric ceramic tube is very small and the measurement precision of a common measuring method is low. The device comprises a to-be-tested piezoelectric ceramic tube, a linear frequency modulation laser, a first plane reflector, a thin glass plate, a second plane reflector, a two-dimensional adjusting frame, a convergent lens, a photoelectric detector and a signal processing system. The method comprises the following steps: the photoelectric detector begins to receive the beam signal; a digital signal processor continuously collects and processes the electric signal output by the photoelectric detector; ...

Device and method for measuring incident angle by linear frequency modulation multi-beam laser heterodyne quadratic harmonic method

The invention discloses a device and a method for measuring incident angles by a linear frequency modulation multi-beam laser heterodyne quadratic harmonic method, which belong to the field of optics, and aim at solving the problem that a conventional angle measurement technique cannot meet the requirement of high-accuracy angle measurement. The device comprises a linear frequency modulation laser, two reflection mirrors, a planar standard mirror, a convergent lens, a photoelectric detector, a filter, a front amplifier, an A/D (Analog-to-Digital) conversion circuit and a DSP (Digital Signal Processor) microprocessor. The method comprises the following steps: after the linear frequency modulation laser is powered on, linear frequency modulation linearly polarized light sequentially passes through the two reflection mirrors and then enters the planar standard mirror in an inclined incident manner, the light passing through a front surface of the planar standard mirror is reflected by a rear ...

Mineral separation inhibitor for controlling phosphorus content of ilmenite concentrate in flotation process, preparation method and application

The invention discloses a beneficiation inhibitor for controlling the phosphorus content of ilmenite concentrate in the flotation process and a preparation method and application thereof.By adding an inhibitor for phosphorus-containing minerals in the ilmenite flotation process and adjusting the adding technology of the phosphorus-containing mineral inhibitor, the floatability of the phosphorus-containing minerals is reduced, the phosphorus-containing minerals enter tailings along with underflow, and the phosphorus content of the ilmenite concentrate is controlled. Therefore, the purpose of controlling the phosphorus content of the ilmenite concentrate in the flotation process is achieved, and good application and popularization prospects are achieved.

Device and method for measuring Young modulus by linear frequency modulation double-beam laser heterodyne

The invention discloses a device and a method for measuring Young modulus by linear frequency modulation double-beam laser heterodyne, relates to a device and a method for measuring Young modulus, and aims at solving the problems that an existing method for measuring Young elastic modulus is large in indirect measurement quantity, complicated in data treatment and low in measurement accuracy. The measurement device comprises a linear frequency modulation laser device, two reflectors, a thin glass plate, a convergent lens, a photoelectric detector, a filter, a preamplifier, an analogue/digital (A/D) conversion circuit and a digital signal processor (DSP), wherein a linearly polarized light emitted by the linear frequency modulation laser device enters the thin glass plate after being reflected by the first reflector; the light transmitted by the thin glass plate enters the convergent lens after being reflected by the second reflector; the reflected light and a light reflected by the front ...

Device and method for measuring glass thickness through linear frequency modulation double-beam laser heterodyning

The invention provides a device and method for measuring the glass thickness through linear frequency modulation double-beam laser heterodyning, and belongs to the technical field of precise glass thickness measurement. The device and method are used for solving the problem that an existing glass thickness measurement method is poor in measurement precision. A frequency modulation laser is used for emitting laser light, the laser light is reflected to flat glass after being reflected by a first reflector and a second reflector, then the laser light is collected to a light sensing face of a photoelectric detector through a convergent lens, the laser light is converted by the photoelectric detector to electric signals which are sent to a digital signal processor through a filter, a head amplifier and an A/D converter, and the glass thickness is obtained after the electric signals are processed by the digital signal processor. The device and method are suitable for measuring the glass thickness ...

Device and method for measuring Young modulus by means of linear frequency modulation multi-beam laser heterodynes second harmonics

The invention discloses a device and a method for measuring a Young modulus by means of linear frequency modulation multi-beam laser heterodynes second harmonics, belongs to the field of optics and aims to solve the problems of large error and poor measuring accuracy in the conventional method for measuring the Young modulus. Linear polarized light emitted by a linear frequency modulation laser obliquely enters a thin glass plate at an incident angle theta0; a light beam transmitted by the thin glass plate enters a first plane mirror, and is reflected and transmitted repeatedly between the thin glass plate and the first plane mirror which are parallel to each other to obtain multiple beams of light; the light beams repeatedly reflected and transmitted between the thin glass plate and the first plane mirror are converged onto the light-sensitive surface of a photoelectric detector together with reflected light on the front surface of the thin glass plate through a converging lens; the photoelectric ...

Linear frequency modulation multi-beam laser heterodyne second harmonic method based glass thickness measuring device and method

The invention discloses a linear frequency modulation multi-beam laser heterodyne second harmonic method based glass thickness measuring device and method and belongs to the technical field of optical measurement. The linear frequency modulation multi-beam laser heterodyne second harmonic method based glass thickness measuring device and method aims at solving the problem that the measuring result is large in error due to the fact that only single to-be-measured parameter values are obtained through the existing glass thickness measuring method. The linear frequency modulation multi-beam laser heterodyne second harmonic method based glass thickness measuring device comprises to-be-measured sheet glass, a linear frequency modulation laser, a first planar mirror, a second planar mirror, a convergent lens, a photoelectric detector and a signal processing system. The linear frequency modulation multi-beam laser heterodyne second harmonic method glass thickness measuring method comprises opening ...

Device and method for measuring Young modulus by virtue of linear-frequency-modulation multi-beam laser heterodyne

The invention relates to a device and a method for measuring Young modulus by virtue of a linear-frequency-modulation multi-beam laser heterodyne, solving the problem that the measurement accuracy is low because the indirect measurement quantity is large and data processing is complex in an existing Young modulus measurement method. According to the device and the method, to-be-measured parameter information is modulated into heterodyne signals by virtue of a linear frequency modulation technique and can be accurately acquired by demodulating laser heterodynes; when the linear expansion coefficient of a sample is measured, a plurality of frequency values including length variable quantities of metal are simultaneously obtained in a frequency domain by utilizing the method, and multiple length variable quantities are obtained after the signals are demodulated, and the accurate variable quantity of the length of the sample along with the changing of the temperature can be obtained by virtue ...

Device and method for measuring magnetostriction coefficient through linear frequency modulation double-beam laser heterodyning

The invention provides a device and method for measuring the magnetostriction coefficient through linear frequency modulation double-beam laser heterodyning, and belongs to the field of magnetostriction coefficient measurement. The device and method are used for solving the problem that an existing magnetostriction coefficient measurement method is not high in measurement precision. The device comprises a linear frequency modulation laser, a first plane mirror, a thin glass plate, a second plane mirror, a convergent lens, a photoelectric detector, a signal processing system, an excitation coil, a fixing device and a power circuit. The power circuit supplies currents for a tested sample in the excitation coil, the photoelectric detector starts to receive light beam signals, and the signal processing system continuously collects light currents output by the photoelectric detector and processes collected difference frequency signals. According to the relation between frequency and distance ...

Acrylic acid series nucleocapsid polymer emulsion and re-dispersible emulsion powder, and method for producing thereof

A preparation method of a fire resistant quencher resistant cement composite gel material

Device and method for measuring magnetostriction coefficient through linear frequency modulation multi-beam laser heterodyne second harmonic method

The invention provides a device and method for measuring a magnetostriction coefficient through the linear frequency modulation multi-beam laser heterodyne second harmonic method and belongs to the technical field of optical measurement. The device and method aim to solve the problem that in the process of measurement of the magnetostriction coefficient of ferromagnetic materials, the precision of measurement of the variation of the lengths of the ferromagnetic materials is low. The device comprises a ferromagnetic material sample to be measured, a linear frequency modulation laser device, a first plane mirror, a thin glass plate, a second plane mirror, a convergent lens, a photoelectric detector, a signal processing system, two fixed rods and an exciting coil. The method comprises the steps that the photoelectric detector is made to start to receive light beam signals, a digital signal processor continuously collects light current signals output by the photoelectric detector and processes ...

Device and method for measuring metal linear expansion coefficient through linear frequency modulation double-beam laser heterodynes

The invention discloses a device and a method for measuring a metal linear expansion coefficient through linear frequency modulation double-beam laser heterodynes and relates to the field of engineering. The invention aims to solve the problem that the conventional measurement method is large in measurement error and low in measurement accuracy. The device comprises a linear frequency modulation laser, a first plane mirror, a convergent lens, a thin glass plate, a second plane mirror, a photoelectric detector, a signal processing system and an electrothermal furnace, wherein the second plane mirror and the thin glass plate are parallel to each other and have the same height; laser subjected to linear frequency modulation obliquely comes into the thin glass plate in an incident angle theta0; the photoelectric detector outputs light current and obtains heterodyne signal frequency through Fourier transform, the distance d between the thin glass plate and the plane mirror is obtained, and the ...

A method of preparing thermal insulating mortar by using solid wastes

Traditional Chinese medicine for treating acne vulgaris

The invention relates to the field of traditional Chinese medicine formulas, in particular to a traditional Chinese medicine for treating acne vulgaris. The traditional Chinese medicine is technically characterized by comprising the following raw materials in percentage by weight: 10-20 percent of yerbadetajo herb, 9-12 percent of magnolia flower, 4-6 percent of divaricate saposhnikovia root, 5-7 percent of garden burnet, 15-18 percent of radix gentianae, 6-9 percent of broom cypress fruit, 3-6 percent of philippine violet herb, 5-8 percent of cape jasmine fruit, 4-6 percent of fructus evodiae, 5-9 percent of common cnidium fruit, 2-4 percent of manyleaf paris rhizome, 4-7 percent of radix bupleuri, 3-6 percent of platycodon grandiflorum and 2-5 percent of radix asparagi. The raw materials are soaked with water, and then decocted, and the slag is removed, so that filtrate is obtained. The traditional Chinese medicine is low in cost, and high in curative effect, has no toxic or side effects ...