667 results about "Grism" patented technology

The invention provides a transmitting-receiving coaxial laser radar optical system, and relates to the technical field of laser radars. The optical system comprises a transmitting assembly, a polarization splitting prism, a quarter-wave plate, a common beam expanding lens group, a micro-lens array, a common lens and a receiving assembly which are arranged in sequence. Laser emitted by the emitting assembly enters the polarization splitting prism, and at the moment, a light beam is linearly polarized light, can pass through the polarization splitting prism and then pass through the quarter-wave plate to reach the shared beam expanding lens group to be collimated and expanded, and finally is emitted for illumination through the micro-lens array and the shared lens; the emergent laser beam is irradiated to an object to return an optical signal, and the returned optical signal is returned to the polarization splitting prism along an original optical path and is reflected into the receiving assembly to be received and processed; according to the invention, the beam splitter prism, the beam expander group and the micro lens array are shared, and the shared lenses are the same and share the lens group, so that the purpose of saving the manufacturing cost of the laser radar is achieved; the method is suitable for automobile automatic driving, distance detection and the like.

The invention discloses a lunar resource in-situ exploration-while-drilling device and method. The lunar resource in-situ exploration-while-drilling device is composed of a spiral drilling tool, an illumination light source module, a polarization spectrum detection module and a dual-channel spectrum measurement module. The drilling tool drill rod is of a hollow structure. Light emitted by the illumination light source module is collimated and depolarized to form unpolarized parallel light to irradiate lunar soil on the side wall of the drill hole, and the polarization spectrum measurement probe collects reflected light of the lunar soil; the reflected light is collimated by a front collimator objective of the probe and then sequentially passes through a spectrum modulation unit consisting of an achromatic 1 / 4 wave plate, a multi-stage wave plate, a beam splitter prism and two polaroids of which the light transmission directions are vertical to each other, and two orthogonal light beams are formed, so that polarization information of the reflected light is modulated in a spectrum dimension; demodulating the modulated spectrum to obtain the spectrum and polarization information of the lunar soil reflected light; and the resource distribution and content and the physical characteristics of the original lunar soil are inversed by using the polarization spectrum characteristics of the lunar soil. According to the invention, in-situ exploration of lunar subsurface depth profile mineral resources can be realized.

The invention discloses an optical imaging system, which sequentially comprises an imaging lens group, a prism and an imaging surface from an object side to an image side along an optical axis, and the imaging lens group sequentially comprises a first lens with negative focal power, a second lens with negative focal power, a third lens with negative focal power, a fourth lens with negative focal power and a fifth lens with negative focal power from the object side to the image side along the optical axis, the object side surface of the second lens is a convex surface; the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface; the fourth lens has positive focal power, and the object side surface of the fourth lens is a convex surface; wherein the optical imaging system comprises four lenses with focal power; the imaging lens group and the imaging surface are positioned on the same side of the prism, and the maximum field angle FOV of the optical imaging system is greater than or equal to 23.2 degrees and less than or equal to 23.6 degrees; the central thickness CT1 of the first lens on the optical axis and the central thickness CT2 of the second lens on the optical axis meet the following conditions: 1.35 lt; cT2 / CT1lt; and 2.60.

The invention discloses a transient absorption spectrum measurement system, method and device for polarized light, and relates to the technical field of ultrafast spectrum measurement. In the system, a laser generation device generates first laser and second laser, and the first laser is converted into left-handed circularly polarized light or right-handed circularly polarized light through a pump light polarization device to serve as pump light for exciting a sample to be detected; the first Glan prism converts the second laser into detection light which is linearly polarized in a specified direction so as to detect the sample to be detected; the first lambda / 4 wave plate is used for converting the detection light after detecting the to-be-detected sample into linearly polarized light with mutually vertical polarization; the Wollaston prism enables the linearly polarized light with mutually vertical polarization to be respectively transmitted to the measuring device along different directions; the measuring device calculates the transient absorption spectrum of the left-hand circularly polarized probe light and the transient absorption spectrum of the right-hand circularly polarized probe light. The system can simultaneously measure the transient absorption spectrums of the left-hand circularly polarized light and the right-hand circularly polarized light, so that the measurement error is reduced.

The invention relates to an optical fiber coupling dynamic interferometer based on arrayed waveguide grating light splitting. A luminous source and an arrayed waveguide grating of the optical fiber coupling dynamic interferometer are arranged on a motion module. The light emitting source is connected to the input port of the array waveguide grating through an optical fiber, and through the movement module, any one of the multiple output ports of the array waveguide grating is in butt joint with the optical fiber connected to the incident end of the collimation structure. A half-wave plate and a beam splitter prism of the imaging element group are sequentially arranged on an emergent light path of the emergent end of the collimation structure, and the beam splitter prism is used for splitting a light beam passing through the half-wave plate into a reference light beam transmitted along a first light path and a measurement light beam transmitted along a second light path. And the reflecting mirror of the imaging element group reflects the reference light beam back to the beam splitting prism. And the to-be-measured surface reflects the measurement light beam back to the beam splitter prism. The reference beam and the measurement beam reflected back to the beam splitter prism interfere with each other and are imaged on the target surface of the camera. Accurate measurement of the wavefront image of the surface to be measured is realized.

Disclosed in the present invention is a photometric stereo-based device for rapidly detecting surface features of an object, capable of rapidly acquiring a plurality of images meeting the requirements of a photometric stereo algorithm. The device comprises a light emitting assembly, an acquisition assembly located above the light emitting assembly, and a data processing module; the acquisition assembly comprises a light path system and a camera group; the light path system comprises: a beam splitting prism group used for splitting reflected light from the surface of an object into a plurality of beams of light and respectively outputting the plurality of beams of light in different preset directions to form images to be processed, and a plurality of bandpass filters correspondingly arranged on the output sides of the plurality of beams of light used for forming said images, wherein the central wavelengths of the bandpass filters are respectively configured to be different wavebands of the reflected light from the surface of the object; the camera group comprises a plurality of cameras which are arranged behind the bandpass filters in a one-to-one correspondence mode and acquire filtered light beams; and the data processing module receives image information sent by the cameras, and performs compensation and photometric stereo reconstruction on the image information, so as to obtain surface features of the object. Further disclosed is a method implemented on the basis of the device.

The invention, which relates to the technical field of structured light measurement, discloses a dual-frequency grating fringe projection system comprising a light source modulation group, a grating modulation group, a beam splitter prism and a projection lens. The light source modulation group comprises a first LED light source, a second LED light source, a first collimating lens group and a second collimating lens group; the grating modulation group comprises a first grating sheet, a second grating sheet, a first piezoelectric ceramic and a second piezoelectric ceramic; the first piezoelectric ceramic in the grating modulation group is connected with the first grating sheet, and the second piezoelectric ceramic is connected with the second grating sheet, so that the positions of the grating sheets are moved, and the stripe patterns at the bottoms of the grating sheets are translated. The system adopts the two piezoelectric ceramics to drive the grating sheets and the beam splitter prisms with different widths for beam combination, the structure is simple, and a low-cost double-frequency four-step phase shift pattern can be realized. The fine grating stripes can improve the measurement precision of three-dimensional reconstruction, and the wide grating stripes can improve the measurement depth of field of three-dimensional reconstruction, thereby improving the application scene of the structured light 3D system.

The invention belongs to the field of astronomical telescopes, and particularly relates to a large-aperture spliced telescope adjusting device and method, and the method comprises the steps: starting a light source module, providing a far-field illumination light beam for a spliced primary mirror, and carrying out the confocal adjustment of each sub-mirror through an adjusting mechanism according to the far-field illumination light beam; the light source switching module is used for providing a near-field illumination light beam for the spliced primary mirror, and the near-field illumination light beam is split into two separated sub light beams by the pyramid mirror after penetrating through a splicing seam of the spliced primary mirror; performing dispersion on all the sub-beams through a dispersion prism, and converging the dispersed sub-beams through an achromatic lens to form dispersion stripes; the phase difference of the dispersion fringes is extracted through the camera, and co-phase adjustment is carried out on the sub-mirrors through the adjusting mechanism according to the phase difference of the dispersion fringes. According to the invention, high-precision and high-flux spectral response calibration and co-phase detection of the large-aperture spliced telescope can be realized, so that reliable technical support is provided for construction and operation of a next-generation giant astronomical telescope.

The invention discloses a nanosecond particle velocity measurement method based on orthogonal line polarization beam splitting, and belongs to the technical field of particle image velocity measurement. The method comprises the following steps: providing two linear polarization state orthogonal double-pulse lasers, and respectively outputting S polarization pulse light beams and P polarization pulse light beams; the four pulse light beams are combined through the double-path laser beam combining mirror set and output to the sheet light mirror set, and a plane illumination jet flow field with the thickness smaller than or equal to 1 mm is formed; scattered light is separated according to a polarization state by using a polarization beam-splitting cubic prism, and particle images under S polarization and P polarization are respectively captured by two double-exposure cameras which are orthogonally arranged; five kinds of time sequence control are triggered through a multi-channel synchronous controller; processing the view field deviation of the two cameras by adopting a block polynomial alignment method; and calculating a particle velocity field based on a particle tracking velocity measurement algorithm. According to the invention, the polarization debugging error is reduced, the homogeneity error after beam combination is obviously reduced, the coincidence degree of the four beams of planar light is improved, and a high-precision universal alignment scheme is provided for the multi-camera PTV technology.

The invention provides an imaging spectrometer motion compensation imaging model construction method, an imaging model and a device, and relates to the technical field of space remote sensing. The method comprises the following steps: establishing a satellite orbit model, and defining a plurality of coordinate systems such as a detector coordinate system and a spectrometer imaging coordinate system and a conversion relation thereof; constructing a detector-scanning mirror-lunar surface ideal geometric mapping model based on the load optical parameters and a ray tracing method; determining the relation between the rotation angle of the scanning mirror and imaging spectrum view field positioning by using a reflecting prism conjugation theory; a quantitative relation is established by combining parameters such as satellite orbits and position postures, and finally a motion compensation imaging model is established. According to the method, the influence of the on-orbit error on the compensation imaging model is analyzed, and the error is used as an uncertainty component to be coupled into the model. According to the method, the problems of low model precision, neglect of influence of orbit observation parameters on imaging and the like in the prior art are solved, high-precision motion estimation and compensation can be realized, and the quality of data acquired by an imaging spectrometer is remarkably improved.

The utility model relates to an LCOS (Liquid Crystal On Silicon) projection device, which comprises a light source module capable of emitting red, green and blue light beams, a polarization filter and an imaging lens which are sequentially arranged along a projection light path, an LCOS chip capable of modulating the polarization state of incident light is arranged on a projection light path between the polarization filter and the imaging lens, and an imaging lens group capable of imaging the incident light onto the LCOS chip is arranged on a projection light path between the light source module and the polarization filter. And a polarization layer capable of transmitting P polarized light and reflecting S polarized light is arranged on the polarization filter. Compared with a polarizing prism applied to a traditional LCOS projection light path, the LCOS projection light path has the advantages that through the arrangement of the polarizing filter and the polarizing layer which is arranged on the polarizing filter and can transmit P polarized light and reflect S polarized light, the LCOS projection light path has higher polarization efficiency, stray light is reduced, and optical efficiency is improved.

The invention discloses an external cavity tunable laser linewidth compression system for realizing wavelength phase locking based on mutual injection of gain chips. The external cavity tunable laser linewidth compression system comprises a red light semiconductor laser main gain chip, a first collimation optical system, a blazed grating, a tuning rotating mirror, a reflector, a power supply driving system and a double-path feedback amplification system, the double-path feedback amplification system comprises a first secondary gain chip, a second secondary gain chip, a second collimation optical system, a third collimation optical system and a polarization-free beam splitter prism; and the red light semiconductor laser main gain chip, the first secondary gain chip and the second secondary gain chip are all connected with the power supply driving system. Therefore, the technical problems of low output infrared light power, poor stability and narrow mode-hopping-free tuning range in the prior art are solved, and high-power, narrow-linewidth, high-stability and large-range mode-hopping-free continuous tuning red light output can be realized.

The invention discloses a wafer back cutting visual positioning system and a positioning method. Comprising a mobile platform, a rotary positioning mechanism, a prism assembly, an image capturing mechanism and a laser generator. A rotary positioning mechanism and prism assemblies are arranged on the mobile platform, and the prism assemblies are arranged on the periphery of the rotary positioning mechanism in the circumferential direction; the prism assembly comprises a prism module, and the prism module moves in the X-axis direction, the Y-axis direction and the Z-axis direction. The rotary positioning mechanism comprises a rotary motor and a ceramic suction cup, the ceramic suction cup is arranged at the output end of the rotary motor, and visual avoiding holes are evenly formed in the ceramic suction cup in the circumferential direction. The image taking mechanism comprises a high-power camera and a back-to-back camera, the two ends of the prism module are arranged opposite to the vision avoiding hole and the back-to-back camera respectively, the high-power camera is used for shooting a wafer back image, and the back-to-back camera shoots a wafer front image through the prism module and obtains the center coordinates of the image. According to the invention, the to-be-cut cutting channel on the back surface of the wafer is positioned.

A periscopic camera module disclosed by the present invention comprises a lens assembly, a motor assembly and an imaging module, the imaging module comprises an optical filter, a photosensitive chip and a circuit board, the periscopic camera module is characterized in that the periscopic camera module further comprises a reflector, the reflector is obliquely arranged behind the lens assembly, and a first preset angle is formed between the reflector and the optical axis of the lens; the imaging module is arranged in the reflecting light path direction of the reflecting mirror, the reflecting mirror comprises a substrate and a reflecting layer on the surface of the substrate, the reflecting layer can be configured to be a film coating medium, the film coating medium is an aluminum film or a silver film, the reflectivity of the film coating medium is larger than 95%, and the reflection bandwidth is the wavelength of 420-680 nm. According to the periscopic camera module provided by the invention, a prism can be replaced by the reflecting mirror, so that the module cost is reduced, and meanwhile, the effect of reducing the thickness of the module is achieved by utilizing the special angle arrangement of the reflecting mirror and the photosensitive chip.

The invention relates to the technical field of optical measurement, in particular to a grating interference measuring device and method based on large-size light spots. The device comprises a light source module which adopts a laser light source with high stability, and the laser light source comprises a wavelength locking device; the collimation and beam expansion module is connected with the light source module; the light splitting module adopts a combined structure of a polarization splitting prism and a lambda / 4 wave plate; the reference grating module comprises a reference grating and a three-dimensional precision adjustment platform; the measuring grating module comprises a measuring grating and a self-adaptive height adjusting mechanism; the imaging module comprises a large-view-field telecentric imaging lens group and a high-speed CMOS image sensor; and a data processing module. One-time measurement of the surface of a large-area object is achieved through the collimation and beam expanding module, efficiency is improved, local interference errors are reduced, the stable laser light source and the reasonable design module are adopted, environmental influences are reduced, optical design is optimized, aberration is reduced, automatic and intelligent measurement is achieved, and convenience and efficiency are improved.

The invention relates to the field of optical detection, in particular to an interference confocal measurement system based on space coding and a measurement method thereof.White light generated by a light source is collimated through a first collimating lens and then divided into S polarized light and P polarized light through a polarization splitting prism, the S polarized light enters a reference plane mirror through a first quarter-wave plate, and the P polarized light enters a second quarter-wave plate; p polarized light enters a blazed grating through a second quarter-wave plate for transverse dispersion and then is changed into monochromatic polarized light with different wavelengths and the same focal length through a first achromatic lens, and the monochromatic polarized light and the monochromatic polarized light are jointly focused at the same depth position of an object to be measured. Information of the object to be measured is carried and returned to the polarization splitting prism, two beams of polarized light are combined and then focused on a target surface of a photoelectric detector of an imaging spectrometer with a mask plate through a focusing lens, an interference image of the object to be measured is obtained, and spectrum and interference analysis is carried out. According to the invention, the transverse scanning speed can be improved, the measurement time can be shortened, and the resolution can be improved.

The invention relates to a Kuder optical path correction method based on laser emission. Firstly, a plane mirror 19 is used for calibrating the installation position of an auto-collimation observation mirror 2 on a laser emission fixing bin 1; replacing a plane mirror 19 with a standard pentaprism 5, and calibrating the arrangement position of the optical theodolite 4 by using the standard pentaprism 5; replacing the standard pentaprism 5 with a Kuder mirror I 11, and determining the mounting position of the Kuder mirror I 11 by using the auto-collimation observation mirror 2 and the optical theodolite 4; and finally, a servo stable rotary table azimuth frame 10 and a servo stable rotary table pitching frame 7 are sequentially mounted on the laser emission fixing bin 1, and an azimuth axis and a pitching axis of the Kuder optical path are respectively corrected by using a laser 8 and a front lens 6. The method has the advantages of simplicity in operation, high correction efficiency, high field adaptability, convenience in equipment disassembly and assembly and the like, the Kuder optical path can be simply and quickly corrected, the optical path deviation is effectively eliminated, and the accuracy and the reliability of optical measurement are improved.

The invention discloses a high-speed high-resolution compressed sensing imaging system and an imaging method. Light of an object is emitted to the polarization splitting prism to be transmitted and reflected after passing through the first-stage imaging module, the transmitted light is reflected back to the polarization splitting prism after being coded and modulated by the spatial light modulator, and then the transmitted light enters the target surface of the camera through the second-stage imaging module to form a coded imaging image; the reflected light is transmitted to the hollow ridge reflecting prism through the quarter-wave plate, is reflected back to the quarter-wave plate through the hollow ridge reflecting prism, then sequentially passes through the quarter-wave plate, the polarization splitting prism and the secondary imaging module and then enters the target surface of the camera to form a common imaging image, and then coded imaging data is matched with common imaging data; and decoding reconstruction is carried out by adopting an alternating direction multiplier method of a point spread function integrated with the first-stage imaging module and the second-stage imaging module. Compared with a traditional imaging mode, the method can break through the imaging frame rate limit of a camera, and has the advantages of high imaging resolution and small data volume.

The invention provides a non-linear error compensation system and method for a stylus contourgraph sensor, and the system comprises a laser light source, an adjustable diaphragm, a beam splitter prism, a focusing lens and a lever which are sequentially arranged along the transmission direction of a light path. An incident light beam emitted by the laser light source is reflected by the lever to form a reflected light beam; the reflected light beam sequentially passes through the focusing lens and the beam splitter prism and then enters the imaging lens; wherein the lever can deflect in the Z direction; the imaging lens, the narrow-band optical filter and the position sensitive detector are sequentially arranged along the transmission direction of the optical path; the position sensitive detector is used for acquiring the position of the center of the reflection light spot in the Z direction before and after the lever deflects in the Z direction; and the control unit is in signal connection with the position sensitive detector. The position change of the reflected light spot in the Z direction is detected, and the angle change of the lever is calculated, so that nonlinear error measurement and dynamic compensation in the X direction and the Z direction are realized.

The invention discloses a hyperspectral imaging system based on prism-grating light splitting, which adopts a slit, a collimator objective, a prism, a grating, an imaging objective and a detector which are arranged in a matched manner, the detector performs push-broom imaging by sequentially collecting relatively moving target object images, the resolution of the imaging in the push-broom direction is in direct proportion to the image collection speed, and the resolution of the imaging in the push-broom direction is in direct proportion to the image collection speed. The image acquisition speed is inversely proportional to the push-scan speed, the detector selects part of the target surface through the region of interest to acquire data so as to increase the image acquisition speed, and the push-scan speed is increased on the premise that the resolution in the push-scan direction is determined; the spectral line bending caused by prism dispersion is opposite to the spectral line bending caused by grating dispersion in direction, and a spectral line bending eliminating light splitting structure is designed to correct the spectral line bending; on the basis of a prism-grating spectral line light splitting eliminating structure, an optical system is designed in combination with the ROI function of the high-speed near-infrared industrial camera, and the acquisition speed of the camera is greatly improved on the premise of moderately reducing the spectral resolution.

The embodiment of the invention provides a laser terminal optical axis calibration method, system and device and a medium, and relates to the technical field of test.The method comprises the steps that the first mass center position of a first light spot generated in a monitoring camera is obtained, and the first light spot is generated after laser emitted by a laser marker is reflected by a first reference prism; the monitoring camera and the laser marker are located on the displacement table, the first reference prism is installed on a laser terminal to be measured, the laser terminal is installed on the rotary table, and the displacement table is located between the laser terminal and the collimator; the rotary table is controlled to rotate until the first mass center position coincides with the position of the preset tracking point, optical axis calibration of the laser terminal and the collimator is completed, and parallel light emitted by the collimator is reflected to the mass center position of a light spot formed in the monitoring camera through the first reference prism. By applying the scheme provided by the embodiment of the invention, the labor cost required for calibrating the optical axis of the laser terminal can be reduced.

The invention relates to the technical field of optics, in particular to a low-crosstalk channel modulation interference polarization spectrum detection method and system, and the system comprises a half-field telescopic module, a phase modulation module, an interference modulation module and a detection module. The half-view-field telescope module is used for performing lower half-view-field beam collimation on an input target beam, the target beam is propagated to the phase modulation module in parallel according to a set range, a composite polarization splitting prism group in the phase modulation module performs light splitting operation based on the target beam output by the half-view-field telescope module, and two parallel polarized lights are emitted, independent phase modulation of the two paths of light is ensured; and the interference modulation module is used for performing light splitting modulation according to the two paths of polarized light to ensure that the two paths of modulated polarized light beams interfere with each other and are transmitted to the detection module for imaging. According to the system, the detection precision of a narrow-band polarization spectrum or a polarization spectrum with an obvious narrow-band wave crest and a narrow-band absorption peak is improved, the polarization spectrum detection capability is high, and the application range is wide.

The invention provides a phase difference coherent Fourier scattering surface particle detection device and method, belongs to the technical field of flexible substrate surface particle detection, and solves the problem of low nano-scale particle detection sensitivity under the condition of low illumination power of a visible light band. The detection device comprises a laser, a collimating lens, a first diaphragm, a polarization state modulation module, a first beam splitter prism, a plane mirror, a piezoelectric actuator, an infinite correction microscope objective, a sample, a three-dimensional piezoelectric scanning table, a two-dimensional coarse adjustment displacement table, a second beam splitter prism, a tube lens, a camera, a wide-field illumination light source, a second diaphragm, a first lens, a third diaphragm and a second lens. The system comprises a two-quadrant photoelectric detector, a weak signal amplification circuit, a data acquisition module and a computer control system.

A camera apparatus includes a camera body portion including a prism unit, a lens assembly, and an image sensor unit, a gyro sensor detecting a hand-shake with respect to the camera body portion and outputting gyro sensor information, a driver circuit generating at least one of a prism driving signal for image stabilization of the prism unit and a sensor driving signal for image stabilization of the image sensor unit based on the gyro sensor information, a prism actuator disposed in the camera body portion for driving the prism unit and performing image stabilization on the prism unit in response to the prism driving signal, and a sensor actuator disposed in the camera body portion for driving the image sensor unit and performing image stabilization on the image sensor unit in response to the sensor driving signal.

The present disclosure provides a method and system for forming an infrared complex image of a moving target and performing synthetic aperture imaging using a sub-mirror array. The method comprises: using a spatial light modulator to phase-modulate an initial linearly polarized laser local oscillator to obtain an orthogonal phase-modulated laser local oscillator; using a depolarizing beam splitter in each sub-mirror module to combine the orthogonal phase-modulated laser local oscillator and a target infrared signal processed by Fourier transform to obtain a combined beam signal; using a direct array detector to receive the combined beam signal, generate a holographic image corresponding to the sub-mirror module, and combine the laser local oscillator image to construct an infrared complex image corresponding to the sub-mirror module; and performing synthetic aperture imaging on the infrared complex images corresponding to the multiple sub-mirror modules based on sub-mirror array parameters and target distance parameters to obtain a synthetic aperture imaging result, wherein the infrared complex images corresponding to each of the multiple sub-mirror modules are obtained at the same moment during the motion of the moving target.

The utility model relates to a device for measuring the three-dimensional shape of a sample with non-uniform reflectivity. The device comprises a structured light illumination element DLP, a collimating lens group, a polarizing beam splitter, a 1 / 4 wave plate, a motor, a dispersion tube lens, an objective lens, an objective table for placing the sample to be measured, a focusing lens, a dichroic mirror, a first optical filter, a first camera, a total reflection prism, a second optical filter, a second camera and a microprocessor, the 1 / 4 wave plate, the motor, the dispersion tube lens, the objective lens, the objective table, the focusing lens, the first camera and the second camera are perpendicular to the same optical axis, and the structured light illumination element DLP, the polaroid and the collimating lens group are parallel to the same optical axis and are perpendicular to the optical axis reflected by a tested sample. According to the utility model, the structure is simple, the first camera and the second camera can rapidly acquire images of two wavebands of a sample with non-uniform reflectivity based on the structured light illumination element DLP, and the microprocessor rapidly measures the height difference of the sample with non-uniform reflectivity based on the images of the two wavebands.

The utility model provides an irradiation-resistant underwater camera with a reflection lens, which comprises a metal middle cylinder main body, and the front end of the metal middle cylinder main body is hermetically connected with a front cover of protective glass with a lens. An imaging structure composed of an electric focusing lens, a lens reflecting prism, a photoreceptor, a circuit main board, a circuit auxiliary board and an imaging module is arranged in the metal middle cylinder body, the imaging structure is fixedly connected with a rear baffle through a lens fixing block and an inner support, and the tail end of the metal middle cylinder body is connected with a rear cover with a watertight connector in a sealed mode. The beneficial effects of the utility model are that the whole body employs a waterproof design, the circuit main board, the circuit auxiliary board and the imaging module all employ an irradiation-resistant circuit board structure, can be applied to an underwater environment with nuclear radiation for a long time, changes the layout of the photoreceptor and the imaging module, adds a lens reflecting prism as an auxiliary structure, improves the imaging structure, and improves the imaging efficiency. The underwater camera shooting imaging effect and the reduction of the width and the size of the camera in the production process are facilitated.

The invention provides a low-noise speckle interference system and method based on a spatial light modulator, and relates to the technical field of speckle interference, and the system comprises a laser, a first beam splitter prism and an imaging element. A laser beam emitted by the laser is divided into transmission light and reflected light by the beam splitter prism I; after being reflected by the third beam splitter prism, part of the transmission light is irradiated on an imaging element as reference light; part of the reflected light sequentially passes through a linear polaroid and a half-wave plate, is modulated by a spatial light modulator assembly, irradiates a fourth beam splitter prism, and is reflected to the surface of a measured object to generate diffuse reflection, so that slow-reflection light is obtained; according to the speckle interference system, object light is modulated by using a spatial light modulator assembly, so that emergent light modulated by the spatial light modulator assembly irradiates a measured object at various illumination angles, mutually independent speckle fields are formed on a target surface of an imaging element, speckle decorrelation noise can be effectively inhibited after multiple times of measurement and superposition, and the measurement accuracy is improved. And the accuracy of subsequent measurement results is improved.

The embodiment of the invention provides a rubidium atomic clock based on a velocity grating spectrum and an implementation method, and the method comprises the steps: enabling a multi-frequency coherent laser source to emit a laser signal containing the velocity grating spectrum, and dividing the laser signal into two paths through a polarization splitting prism; the reflected light beam enters the laser frequency stabilization module to realize laser frequency stabilization; a transmission light beam enters the rubidium bubble through the lens group to interact with rubidium atoms; the photoelectric tube detects a transition spectral line, converts the transition spectral line from an optical signal into an electric signal and transmits the electric signal to the lock-in amplifier for demodulation; the integral amplification module converts the demodulated direct-current voltage into linear increasing voltage and transmits the linear increasing voltage to the crystal oscillator; the crystal oscillator generates an initial microwave signal and generates a microwave signal corresponding to the 87Rb atom through the frequency synthesizer; and the phase frequency modulation module modulates the microwave signal to obtain an error signal and transmits the error signal to the microwave resonant cavity so as to adjust the electromagnetic field according to the error signal to stably lock the rubidium atomic clock. The method is used for achieving the effect of improving the stability of the rubidium atomic clock system.

The invention discloses a polarization imaging device and a polarization analysis method based on single-frame polarization collinear holography, and relates to the field of polarization imaging.According to the polarization imaging device, through combination of optical elements such as a half-wave plate, a Wollaston prism and a CCD camera, spatial multiplexing of a detector plane is carried out, and the polarization collinear holography is obtained. And four polarization collinear holograms can be simultaneously acquired by a single frame. According to the polarization analysis method, a Fourier transform auxiliary angular spectrum method is adopted to analyze an intensity distribution diagram of a polarization collinear hologram to estimate initial wavefront distribution, and an iterative finite support constraint selection method is adopted to solve the problem of twin images in the polarization collinear hologram. And further quantizing a complete Jones matrix and a complete Stokes parameter from the finally reconstructed complex amplitude information. The invention solves the problems of high complexity and long processing time caused by independent reconstruction of amplitude, phase and polarization in the traditional polarization holographic technology, and effectively solves the problem that the traditional off-axis polarization holographic imaging system limits the size of an imaging field of view.