34 results about "Michelson interferometer" patented technology

The invention provides a dynamic interference focusing method and system based on a Michelson interferometer, and the method comprises the steps: obtaining interference fringes under different defocusing amounts through employing the dynamic interference focusing system based on the Michelson interferometer, carrying out the analysis of the received interference fringes through an upper computer, and obtaining phase information, based on the phase information of the interference fringes corresponding to different defocusing amounts, a mapping relation between the defocusing amounts and the phase information is constructed; in the application, the current interference fringes are obtained through the dynamic interference focus fixing system of the Michelson interferometer, the current interference fringes are analyzed through the upper computer to obtain the current phase information, and the current defocusing amount is obtained by adopting the mapping relation based on the current phase information. And moving the sample to a calibrated focal plane position by controlling a dynamic interference focus fixing system of a Michelson interferometer based on the current defocusing amount to complete automatic focus fixing. The method can achieve the nanoscale focusing sensitivity.

The invention relates to the technical field of ultrafast laser and light quantum, and provides a single-cavity double-optical-comb absolute distance measurement system and method based on repetition frequency scanning. The system comprises a single-cavity double-optical comb system which is used for simultaneously establishing clockwise and anticlockwise propagating mode-locked pulses in an annular cavity through a bidirectional pumping source and outputting a main oscillation optical comb and a local oscillation optical comb through a polarization maintaining optical fiber coupler; a first piezoelectric ceramic and a second piezoelectric ceramic are arranged in the annular cavity, and the first piezoelectric ceramic and the second piezoelectric ceramic are adjusted through a differential driving mode so as to lock and regulate the repetition frequency difference between the main oscillation optical comb and the local oscillation optical comb; the double-optical-comb distance measuring system is used for combining the main oscillation optical comb passing through the Michelson interferometer with the local oscillation optical comb not passing through the Michelson interferometer to generate a radio frequency beat frequency signal; and calculating the real-time absolute distance of the measured target according to the optical path difference of the radio frequency beat frequency signal and the repetition frequency difference of the main oscillation optical comb and the local oscillation optical comb.

The invention discloses a precise measurement method for object surface out-of-plane displacement under high-frequency micro-vibration. The method comprises the following steps: exciting an object to generate high-frequency steady-state vibration through a vibration exciter, freezing a surface state at any vibration position of the object by adopting stroboscopic pulse laser with strictly same frequency as the vibration, and forming a shear speckle field by utilizing a Michelson interferometer comprising a piezoelectric ceramic driving phase-shifting mirror. The movement of the phase shift mirror and the acquisition of the high-speed camera as well as the actions of the stroboscopic laser and the vibration exciter are synchronously controlled through the double-signal controller, so that the accurate acquisition of multiple phase shift speckle interference images is realized. The image is processed based on a four-step phase shift algorithm, and the phase difference of the vibration position is calculated, so that the out-of-plane displacement derivative and the out-of-plane displacement in the shearing direction are calculated. According to the invention, the signal-to-noise ratio and the sensitivity of vibration measurement are obviously improved, and the method has full-field, non-contact and micro-nano displacement resolution capabilities, and is suitable for the fields of material nondestructive testing and structure health monitoring.

The invention relates to the field of optical fibers, in particular to a D-type optical fiber based on Fe3GaTe2 nanosheets and a preparation method and application of the D-type optical fiber. The invention discloses a D-type optical fiber based on a Fe3GaTe2 nanosheet. The D-type optical fiber comprises a D-type optical fiber and a Fe3GaTe2 layer deposited on a D-type plane of the D-type optical fiber. By utilizing the evanescent field characteristic of the D-type optical fiber, the Fe3GaTe2 nanosheet is deposited on the D-type plane of the D-type optical fiber, and magnetic anisotropy change (such as magnetization direction switching) is generated under the action of an external magnetic field, so that the effective refractive index of the optical fiber is changed; the change is converted into an optical path difference in the Michelson interferometer. Finally, the magnetic field intensity can be inverted by measuring the FSR change of the interference spectrum. The room-temperature MA adjustability of the Fe3GaTe2 nanosheets provides a larger refractive index change range (superior to that of magnetic fluid), and the nanosheets are not easy to degrade, so that the D-type optical fiber has higher sensitivity and temperature performance.

The application provides a time delay interferometric ground semi-physical experimental verification scheme, which comprises the following steps: (1) based on a space gravitational wave detection task and a load configuration scheme, acquiring a space gravitational wave detection task core measurement, and recording measurement data; (2) constructing an algebraic relationship of a time delay interferometric scheme capable of effectively eliminating laser frequency noise and secondary noise such as optical platform jitter, and calculating a first generation time delay interference and a first generation basic combination solution according to the algebraic relationship; (3) repeating the above step (2) for multiple rounds, compensating for the difference of the equivalent interference measurement arm length, and further suppressing laser frequency noise. The application has reasonable concept, and a semi-physical simulation platform of an equivalent million kilometer arm length unequal arm Michelson interferometer is built by combining a lock arm frequency stabilization system and an electronic phase delay system, so that effective suppression of laser frequency noise is realized.

The application discloses a moving mirror system of a Michelson interferometer based on magnetic suspension positioning technology, which comprises a moving mirror main body and three electromagnet groups. The moving mirror main body comprises a lens base, a metal mirror, connecting rods and magnetic pole balls. The number of the connecting rods is three, and the three connecting rods are arranged on the side edges of the lens base. The number of the magnetic pole balls is three, and the three magnetic pole balls are arranged on the other ends of the three connecting rods respectively. The electromagnet group comprises an electromagnet support, coils and magnetic pole heads. The electromagnet support is composed of three wedge-shaped bodies. The number of the coils is three, and the three coils are fixed on the three wedge-shaped bodies by electromagnet bolts respectively. The application has the advantages of no abrasion, simple realization, easy control and easy manufacturing. Meanwhile, the precision is not lost due to the increase of the use frequency and use time. Since only electromagnets are adopted as the core parts, the machining and manufacturing are very simple and easy, and the technical threshold of production design and manufacturing is lowered.

This invention provides a system for simultaneously measuring thin film thickness and refractive index based on spectral domain optical coherence tomography. It employs a free-space Michelson interferometer structure, using a beam splitter to separate broadband low-coherence light into reference and sample light. The two beams propagate separately in the free-space reference arm and free-space sample arm, respectively, before being combined and interfering. This fundamentally avoids the adverse effects of dispersion, polarization changes, and optical path drift introduced during fiber optic transmission. Simultaneously, this invention utilizes spectral domain optical coherence tomography to obtain the depth position information of different reflective interfaces in the sample arm. Combined with the positional changes of the plane mirror under reference and sample conditions, the geometric thickness and refractive index of the thin film can be simultaneously obtained by solving a simple set of equations. This simplifies the measurement process, improves data processing efficiency and measurement operability, and provides a reliable technical foundation for online monitoring and quality control in industrial coating processes.

A light source unit (1) is provided with a semiconductor optical amplifier (10), a filter unit (30), a Michelson interferometer (40) and a detector (44). The Michelson interferometer (40) has: a coupler (41) which, with a predetermined branching ratio, branches light (L2) from a filter unit (30) inputted to a first port (41a) into a first waveguide (51) connected to a second port (41b) and a second waveguide (52) connected to a third port (41c) and having an optical path length different from that of the first waveguide (51); a first mirror (42) which returns, to the coupler, at least some of first branched light (Lb1) outputted from the second port (41b); and a second mirror (43) which returns, to the coupler, at least some of second branched light (Lb2) outputted from the third port. The detector (44) detects interference light among the light returned to the coupler (41) from the first mirror (42) and the second mirror (43). The branching ratio of the coupler (41) is set to an unequal ratio.

A fiber-optic sensor for measuring direct-current electric field strength, the fiber-optic sensor comprising an equal-strain cantilever beam (1), wherein a metal conductor (2) is fixed on a free end of the equal-strain cantilever beam (1); the upper and lower surfaces of the metal conductor (2) are respectively an upper charge induction surface and a lower charge induction surface, with the surface area of the upper charge induction surface being larger than the surface area of the lower charge induction surface; and an interference optical fiber (3) in a Michelson interferometer configuration is also fixedly connected to the equal-strain cantilever beam (1). A direct-current electric field strength measurement apparatus, which comprises a laser source, a circulator, a spectrometer and a sensor. After the components are connected, a quadratic function relationship between a direct-current electric field strength value and the strength value of a same interference peak in an output spectrum is determined; a corresponding database is established on the basis of the quadratic function relationship; the direct-current electric field strength measurement apparatus is used to test a direct-current electric field to be tested, so as to obtain a corresponding interference-peak strength value in a corresponding output spectrum; and on the basis of corresponding data in the database, a direct-current electric field strength value of said direct-current electric field is obtained.

The application belongs to the technical field of acoustic measurement, and discloses a free space sound field measurement method and system, which constructs a free light path sound field measurement system based on the principle of Michelson interferometer; collects a reference image, introduces a sound field to be measured, performs translation and rotation scanning through a computer to control a loudspeaker or a laser beam, and completes interference pattern data collection; pre-processes the collected interference pattern, identifies the edge of the interference fringe by using edge detection technology, and calculates the light phase change amount; sound field reconstruction is performed by using a Radon inverse transform algorithm, sound field integral information carried by the laser beam is converted into the sound pressure value of each point in the real space, and a free field sound pressure distribution map is reconstructed. The application has the advantages of non-destructive and low cost, and significantly improves the sound field measurement accuracy and the integrity and reliability of reconstruction, can effectively capture the nanometer level optical path change caused by the sound field, and ensures the high accuracy of sound field measurement and the accuracy of sound source identification.

The invention relates to the technical field of viscosity coefficient measurement, in particular to a liquid viscosity coefficient measuring device based on a Michelson interferometer. Comprising a wave source generation system, a ripple schlieren acquisition system, an interference pattern acquisition system and an image processing system, the wave source generation system is used for forming stably propagating surface waves on the surface of liquid to be measured, and the ripple schlieren acquisition system is used for acquiring projection schlieren of the surface waves to measure wavelength. The interference pattern acquisition system is used for capturing an interference circular ring change generated by the Michelson interferometer so as to calculate the amplitude of the surface wave, and the image processing system is used for analyzing acquired image data and fitting a surface wave amplitude attenuation curve by combining wavelength and amplitude information so as to calculate a liquid viscosity coefficient; the operation process is obviously simplified, the experiment threshold and the requirements on operators are greatly reduced, and the accuracy, repeatability and reliability of measurement are improved.

This invention belongs to the field of optical material measurement technology, specifically a device and method for measuring the refractive index of curved optical lenses based on white light spectral interferometry. The invention employs a Michelson interferometer combined with a small-core fiber optic detection scheme. A 45-degree mirror folds the optical path vertically, allowing the curved lens sample to be placed horizontally on a sample holder. The small-core fiber collects interference signals only from the central region of the lens, enabling the curved interference to be approximated by an equivalent planar model. During measurement, the interference spectrum of the sample in place and the air reference spectrum after sample removal are collected separately. The group refractive index dispersion curve of the sample over a wide wavelength range is calculated by analyzing the fringe period. This invention eliminates the need for a flat sample, allowing direct measurement of curved lenses and spectacle lenses; it also eliminates the need for mechanical scanning components, offering a wide measurement range and high accuracy.

This invention provides a method and apparatus for femtosecond laser feedback shaping of surface micro / nano structures, belonging to the field of laser application technology. Addressing the problems of low edge precision and low efficiency in femtosecond laser processing, this invention replaces the two reflectors of a Michelson interferometer with two spatial light modulators: the first spatial light modulator loads a patterned phase map to define the processing shape, and the second spatial light modulator calculates a corrected phase based on the difference between the measured light field intensity and the theoretical light intensity and loads a corrected phase map, achieving closed-loop feedback shaping and obtaining a high-quality patterned light field. After beam contraction via a multi-stage 4f system, the micro / nano structure is ablated by single-pulse surface exposure, and large-area, high-efficiency fabrication is achieved by combining serial flying scan stitching. This invention requires no mask or vacuum environment, offers high processing precision and efficiency, and can flexibly customize various metasurface micro / nano structures.

The application relates to a seawater dynamic pressure real-time measurement method and system and relates to the technical field of marine pressure measurement.The application comprises the following steps: improving a measurement probe based on a Michelson interferometer, collecting sample signals under different temperature pressures, analyzing the frequency difference between an interference peak and an absorption peak, combining temperature pressure data, and constructing a data set.The application combines a neural network architecture and physical guidance to establish a Gaussian process regression model as a pressure calculation model, adopts Gaussian process regression of a composite kernel function, trains the model by using the data set, makes the model generate a frequency difference response curve caused only by pressure under the condition of a fixed temperature reference value, combines partial derivative analysis to quantize pressure sensitivity, and ensures the accuracy and reliability of model decoupling results.In actual application, total pressure signals and static pressure signals of a sea area collected by a dynamic pressure measurement probe are subjected to small continuous dynamic pressure identification through the pressure calculation model.

The invention discloses a photoelastic effect measuring device and a photoelastic effect measuring method, particularly relates to the technical field of optical measurement, and solves the technical problems that a traditional method in the prior art cannot record the change of a refractive index in a stretching process in real time, lacks dynamic analysis capability and is difficult to quantify the photoelastic effect. According to the technical scheme, the refractive indexes corresponding to different thicknesses after the PET plastic film is uniformly stretched are quantitatively measured by utilizing the high sensitivity advantage and the unique interference phenomenon of a Michelson interferometer, a refractive index-thickness curve is fitted by utilizing a least square method, an experimental phenomenon is presented through a visual interface, and the measurement accuracy is improved. Automatic data processing and uncertainty analysis are carried out, and a user is helped to deeply understand the photoelastic effect principle, namely the birefringence phenomenon of the photoelastic effect; according to the invention, automatic, quantitative, high-precision and visual measurement can be realized.

The invention discloses a micro-pressure optical measurement system and method based on a Michelson interferometer and a smart phone. The micro-pressure optical measurement system comprises the Michelson interferometer, a hydraulic lever secondary displacement zooming module and a smart phone sensing module. According to the system, the liquid level height difference caused by weak pressure is scaled step by step and converted into nanoscale displacement of a movable reflecting mirror of an interferometer, so that interference fringes are caused to move. The optical sensor of the intelligent mobile phone is used for automatically recording and accurately counting stripe changes, a linear quantitative relation between the stripe change ring number and the pressure is established, and high-precision and automatic measurement of the millinewton-level weak pressure is achieved. The method has the advantages of low cost, simplicity and convenience in operation, high anti-interference capability and the like, and greatly expands the application scenes of the Michelson interferometer and the smart phone in physics teaching and scientific research.

The application aims to provide a one-way code generation semi-quantum key distribution system and method, wherein the coded photons are transmitted in a one-way manner in a channel, and the returned photons are used to quantify the information amount of a eavesdropper, and the security of the protocol is proved based on a collective attack. The one-way loading key is realized by using a Michelson interferometer, the Trojan horse attack problem commonly existing in the existing two-way system is solved, the security of the real system is improved, and the key generation rate is improved under certain distance conditions. The system and method provided by the application have high security and practicability.

An optical path length sensor for sensing a physical quantity of an external source includes a plurality of lasers, each having an optical resonator and a gain medium to produce a laser beam in the optical resonator. At least one of the optical resonators is configured to modulate the optical frequency of the laser beam when exposed to the external source. The sensor further includes a common carrier, in which the optical resonators are arranged, and a device configured to receive light from the plurality of lasers and to determine a difference between the optical frequencies of the laser beams. In another aspect the optical path length sensor includes a plurality of interferometers, each being an asymmetric Mach-Zehnder or an asymmetric Michelson interferometer, at least two of the plurality of interferometers having a different optical path length imbalance.

The present application relates to the field of optical precision measurement, and discloses an angle measurement method and device based on micro-wavelength difference dual-wavelength interference, comprising the following steps: using a micro-wavelength difference dual-wavelength extended light source, generating isoclinal interference fringes through a Michelson interferometer; using a linear moving mechanism with adjustable tilt direction to move the plane mirror of the test light beam along the tilt direction; and indirectly measuring the tilt angle through the fringe change characteristics of the micro-wavelength difference dual-wavelength interference. The interference method and device for measuring the angle are simple and easy to operate, and are convenient to install and debug; are suitable for high-precision measurement of micro-angles and angles near 180 degrees; use the blurring or clarity of the interference fringes as the basis for judgment and positioning, are sensitive in response, have good accuracy, and are also suitable for computer automatic analysis and processing; and can obtain precision of the order of seconds by using a low-precision linear displacement mechanism to obtain high-precision angle measurement.

The sensor comprises a cuboid integral base made of metal with good heat conductivity, through holes are formed in the centers of the three opposite faces of the integral base, and a spectroscope is arranged in the center of the orthogonal holes; a measuring port reflecting mirror, an end reflecting mirror, a laser device and an interference fringe detector are inserted into the holes in the periphery respectively and fastened to the overall base, a Michelson interferometer with the spectroscope as the center and hidden in the overall base is obtained, and the high-precision laser interference sensor which is uniform, portable, resistant to external interference and capable of being placed at will is constructed. The sensor is small in size and convenient to assemble, ingeniously overcomes the defect that interference measurement has too high environmental requirements, achieves high-precision detection of high-end materials such as chip wafers and the like, can be expanded to workshop and even field detection which traditional interference measurement cannot adapt to, can reach the picometer level in measurement precision, fully shows the unique advantages of digitization and standardization, and is suitable for popularization and application. The method has important scientific and technical values and economic benefits.

The invention discloses a common-mode noise self-suppression distributed optical cable vibration measurement system, which comprises an optical measurement host, a first guide optical cable, a second guide optical cable, a sensing optical cable and a computer, and is characterized in that a noise source exists near the first guide optical cable and / or the second guide optical cable; one ends of the first guide optical cable and the second guide optical cable are respectively connected with the optical measurement host, and the other ends of the first guide optical cable and the second guide optical cable are respectively connected with the sensing optical cable; the optical measurement host, the first guide optical cable and the second guide optical cable construct two parallel and independent Michelson interferometers with unequal arm lengths; and the computer is used for carrying out differential processing on the difference frequency interference signals of the two Michelson interferometers with unequal arm lengths to realize self-suppression of common-mode noise and demodulate vibration information along the sensing optical cable. Therefore, the interference of common-mode noise such as temperature drift, airflow disturbance and overall mechanical vibration on a measurement result can be effectively suppressed, and the signal-to-noise ratio and the measurement precision of the system are improved.

The application provides a kind of optical fiber sensing system suitable for pipeline leakage monitoring, comprising: pump laser, wavelength division multiplexer, at least one optical fiber hydrophone installed in pipeline, Michelson interferometer, optical fiber phase demodulator, pump laser and Michelson interferometer are connected with wavelength division multiplexer, wavelength division multiplexer is connected with optical fiber hydrophone, and optical fiber phase demodulator is connected with Michelson interferometer.Sensitive area of optical fiber hydrophone is installed in pipeline, to reduce the influence of external environment on monitoring result.Through monitoring infrasonic wave signal in pipeline by optical fiber hydrophone, real-time leakage of long distance pipeline is monitored.High sensitivity, simple installation and construction, not easy to be disturbed by external environment, to realize real-time high-precision detection of underwater sound.

The application relates to the technical field of liquid detection, in particular to a multi-parameter liquid detection experiment device based on a Michelson interferometer, which comprises an interferometer main body, a signal acquisition module, a data processing unit and a multi-parameter sensor assembly. The interferometer main body is provided with an adjusting groove, a sliding support and a beam splitter seat, the angle of a beam splitter lens is adjustable, a wide-spectrum light source and a photoelectric detector are symmetrically arranged, the signal acquisition module is connected with the photoelectric detector through an optical fiber, the data processing unit adopts an embedded processor, and the multi-parameter sensor assembly comprises temperature, concentration and liquid level sensors and respectively detects liquid related parameters. The application can realize synchronous high-precision detection of liquid refractive index, temperature, concentration and liquid level, has the characteristics of compact structure, simple operation and high automation degree, and is suitable for teaching experiments and scientific research applications.

This invention discloses a micro-displacement measurement device and method based on a Michelson interferometer, relating to the field of micro-displacement measurement technology. The device includes a housing with a mounting platform at its bottom; a Michelson interferometer mounted on the mounting platform; and a movable optical path compensator comprising a base, an angular transparent medium, and a transmission rod. The base corresponds to the beam splitter and reflector of the Michelson interferometer, and its upper surface has a guide groove perpendicular to the relative direction of the beam splitter and reflector. The lower end of the angular transparent medium is slidably connected in the guide groove. One end of the transmission rod is connected to one end of the angular transparent medium, and the other end of the transmission rod is a connecting end. The angular transparent medium includes a first sidewall and a second sidewall. Both the first and second sidewalls are perpendicular to the mounting platform, and there is a preset angle θ between them. The first or second sidewall is perpendicular to the relative direction of the beam splitter and reflector. This invention effectively improves the precision of micro-displacement measurement and is convenient to carry.

The application discloses a kind of heavy frequency self-calibration double optical frequency comb ranging systems and methods, the system includes double optical frequency comb light source module, interferometer ranging module and signal acquisition and data processing module.Double optical frequency comb light source module uses two optical frequency comb light sources with small heavy frequency difference.Interferometer ranging module converts the distance information to be measured into the flight time of signal optical frequency comb by Michelson interferometer, then uses double optical frequency comb interferometer to amplify the flight time from optical scale to radio frequency scale.Signal acquisition and data processing module obtains the heavy frequency size after undersampling by peak finding, intercepting, fast fourier transform, phase spectrum fitting and other operations to obtain the flight time in real time, to realize the self-calibration of the distance to be measured by periodic fast fourier transform and amplitude spectrum analysis.The application only uses double optical frequency comb interference signal itself and simple signal post-processing algorithm, without any external heavy frequency detection module and frequency counter, to realize accurate double optical frequency comb ranging.

The invention discloses a phase demodulation method and system suitable for any phase shift modulation and terminal equipment. The method comprises the following steps: calibrating a modulation degree; the method comprises the following steps: injecting an RBS signal generated by an optical fiber into an unbalanced Michelson interferometer, outputting a self-interference intensity signal carrying three self-interference intensity signals, and performing analog-to-digital conversion to obtain a corresponding light intensity signal containing three adjacent pulse periods; determining a phase shift angle difference corresponding to the light intensity signal, substituting the light intensity signal and the phase shift angle difference into any pre-constructed phase shift demodulation model, and calculating to obtain a phase difference signal after the DC component is eliminated; and traversing all pulse data by adopting a moving window method to obtain continuous phase signals distributed along the optical fiber. The system comprises a narrow linewidth laser light source, a pulse modulation and amplification unit, a phase modulation module, an analog-to-digital conversion module, a phase demodulation module and a continuous phase recovery module. According to the method, the system hardware cost and the calculation complexity are reduced, the calculation efficiency is improved, and the method is suitable for application scenes with large-scale requirements.

This invention provides a method and apparatus for detecting the center thickness of a multi-lens group lens based on low-coherence detection, belonging to the field of modern optical precision measurement technology. It utilizes a moving guide rail to scan and construct equal-path low-coherence interference fringes to obtain the positions of the front and rear surfaces of each lens. A high-coherence Michelson interferometer is used for phase extraction to obtain the phase difference between the front and rear surfaces of the lens, thus determining the lens thickness. An optical switch is used to construct a switchable forward and reverse measurement structure, and an optical path compensation mechanism is introduced as needed, effectively solving the problem of weak or even missing reflection signals from the rear lenses due to the gradual attenuation of light energy during multi-lens group measurements. This invention employs a non-contact measurement method, which is fast and easy to operate. It is suitable for measuring the center thickness and optical spacing of single lenses and multi-lens groups, possessing good versatility and engineering application value, especially suitable for multi-lens group measurement scenarios with weak reflection signals or large equivalent optical path ranges.

The utility model provides a kind of rapid optical frequency detection device, including the Michelson interferometer with one input light path, the Michelson interferometer has at least 2 interference arms, the interference arm tail is provided with the same mirror as the interference arm number, input light is reflected after entering interference arm Michelson interferometer, generates multipath output light, the output light is received by first photoelectric detector, and the first photoelectric detection signal generated is used to calculate the optical frequency variation of input light;One light path in the input light is input to wavelength division multiplexer, and the two light output by the wavelength division multiplexer is received by two second photoelectric detectors, and second photoelectric detection signal is generated to calculate the absolute optical frequency of input light.

The present application relates to a kind of based on optical coherence tomography self-lubricating bearing coating thickness detection system and method, the system includes: tungsten halogen lamp light source module, for emitting light beam;First convex lens, for the emitted light of tungsten halogen lamp light source module is collimated as parallel light beam;Michelson interferometer module, for the light beam is split into two light beams of equal intensity, as reference light, probe light respectively converge in reference mirror, bearing coating surface to be measured, after reflection, interference occurs, and interference light beam is formed;And two-dimensional spectrometer module, including mirror, reflective grating, column lens and area array CCD camera, interference light beam is propagated to reflective grating by mirror, and after wavelength is spectrally dispersed in space, interference spectrum line is converged by column lens, and two-dimensional interference spectrum stripe is obtained by area array CCD camera acquisition, and then bearing coating thickness information is obtained.The system and method are beneficial to the non-contact nondestructive testing of self-lubricating bearing coating thickness, and measurement speed is fast, and detection precision is high.

The invention discloses a full-baseline complex coherence degree parallel measurement method of a Michelson interferometer, which belongs to the technical field of optical telescopes and realizes parallel measurement of full-baseline complex coherence degree by directly decoupling interference fringes of all baselines through a single-frame image surface speckle image. The method comprises the following specific steps: performing frequency domain band-pass filtering on a collected image surface speckle image; the stripe intensity sampling spacing is refined through frequency domain up-sampling; linear projection integration is carried out along the vertical direction of each base line, and integration signal intensity is collected; eliminating irrelevant variables to obtain interference fringe intensity distribution of all baseline pairs; and finally, measuring the complex coherence degree of each group of stripes by using an ABCD method. The complex coherence degree of all the baseline pairs can be synchronously obtained only through digital image processing without additional optical elements, and the method has the advantages of being simple in structure, high in anti-noise capacity, easy and convenient to operate, good in portability and the like, and is suitable for dark and weak observation scenes.