39 results about "Multiple diffraction" patented technology

The invention provides a three-dimensional imaging method, an imaging system and a computer readable storage medium. The three-dimensional imaging method comprises the following steps: acquiring a plurality of diffraction order images of a target object through the imaging system; calculating a parallax value between the images of different diffraction orders, and converting the parallax value into a corresponding depth value; constructing a three-dimensional point cloud image of the target object by using the depth value; the imaging system is used for obtaining the multiple diffraction order images of the target object, the multiple diffraction order images can serve as parallax images shot at different positions, the parallax values between the different diffraction order images are used for obtaining the corresponding depth values, and therefore generation of the three-dimensional point cloud image can be completed without using two cameras to shoot two images; the hardware requirement and the arrangement requirement of the imaging system are reduced, and the difficulty of three-dimensional imaging is small.

According to the broadband ultrahigh-resolution spectrometer grating turntable precision control method based on the PSO-RBF neural network provided by the invention, the PSO algorithm is taken as an efficient global optimization method, the PSO algorithm and the RBF neural network are organically combined, the PSO global optimization and the online learning ability of the RBF neural network are fused, and the precision of the grating turntable of the broadband ultrahigh-resolution spectrometer is improved. An intelligent control system suitable for precise control of the grating rotary table is constructed, effective compensation of the system for nonlinear characteristics and parameter uncertainty is achieved, the positioning precision and the anti-interference capacity of the system are improved, and the requirement for ultrahigh-resolution spectral measurement under the condition of multiple diffraction is met.

The application provides a laser processing brittle material multi-focus cracking device, which comprises a laser, a beam expanding and collimating system, a diffraction element and a beam focusing system; the laser is used for emitting laser; the beam expanding and collimating system is arranged on a light path of laser transmission, and is used for expanding the laser emitted by the laser; the diffraction element is used for making the laser generate multiple diffraction orders; and the beam focusing system is used for focusing the laser, so that the laser forms multiple focuses in the longitudinal position of the brittle material. The application controls the focusing sequence of the focuses in the material by introducing a specific diffraction optical element and adding a high-frequency oscillation filter on the focusing light path, and multiple modified layers are formed in the longitudinal position of the material through one-time scanning of the laser, so that the cold cracking efficiency is greatly improved.

The invention relates to a lighting device (1) for a motor-vehicle part, comprising an optical film (100) comprising a body (110) extending in a main extension plane and configured to propagate a plurality of light beams (F1), the optical film comprising a first series (S1) of multiple diffraction gratings called light entry diffraction gratings (120), arranged in a first direction in the main extension plane of the body (110), each light entry grating of the first series being intended to face a light source and each light entry grating of the first series comprising multiple periodic, inclined optical patterns (121) configured to make a light beam generated by the light source propagate through the body (110) in a second direction in the main extension plane of the body (110), the second direction being different from the first direction. The invention also relates to a vehicle part (3) comprising the lighting device.

An optical element for augmented reality and other devices is described. The optical element includes a multilayer waveguide, an in-coupling element for directing imaging light into the multilayer waveguide, and an out-coupling element spaced apart from the in-coupling element for directing light out of the multilayer waveguide to form a virtual image in the viewing field of an observer. The out-coupling element is a diffractive optical element that includes two or more diffractive grating layers that differ in refractive index. Inclusion of multiple diffraction grating layers in the out-coupling element leads to an improvement in the brightness uniformity of virtual images produced by imaging light spanning a wide range of incidence angle.

This invention relates to the field of optical detection technology, specifically a multifocal parallel phase extraction and alignment system based on a spatial light modulator, comprising: a wavefront modulation module, a parallel detection module, an information extraction module, a parameter calculation module, and a correction and execution module. The wavefront modulation module loads a phase modulation pattern through a spatial light modulator, generating a complex wavefront containing multiple diffraction orders via the objective lens, forming multiple spatially separated detection focal spots on the sample surface. The parallel detection module receives the reflected light signals from each focal spot in parallel through an array detector. The information extraction module analyzes the signals and extracts the phase offset of each focal spot, constructing a mapping set between position and phase offset. The parameter calculation module calculates the tilt angle and field curvature distribution parameters based on this set. The correction and execution module generates a comprehensive correction signal to drive the objective lens or sample stage to perform multidimensional attitude adjustments. This system achieves multifocal parallel detection and synchronous parameter calculation, improving alignment efficiency and accuracy.

The invention discloses an input coupler of a convolution traveling wave amplifier, and belongs to the technical field of microwave devices. The coupler for converting the rectangular waveguide TE10 mode into the circular waveguide TE11 mode structurally and mainly comprises an input rectangular waveguide, an electron beam circulation end and an output circular waveguide, the rectangular waveguide is connected with the circular waveguide, and the electron beam circulation end is completely communicated with the output circular waveguide. The electron beam circulation end is composed of a plurality of cylindrical resonant cavities, and the number, the radius and the width of the cylindrical resonant cavities are matched with the working frequency of the device. Compared with a traditional input coupler, the input coupler disclosed by the invention ensures that a TE11 mode is output by the output circular waveguide in a single direction by utilizing a multi-diffraction principle of a plurality of cylindrical resonant cavities, and the transmission and purity of the output circular waveguide TE11 mode can be improved; meanwhile, the electron beam circulation end is an open end, and a large space can be provided for electron beam circulation.

The invention relates to the technical field of nondestructive testing, and particularly provides a fuel rod cladding damage detection method based on multiple diffraction guided wave probability imaging, which comprises the following steps: arranging a pair of signal receiving and transmitting devices at two ends of a to-be-detected area of a fuel rod cladding for transmitting an input signal f (t) and receiving and acquiring wave field data; performing narrowband signal extraction on the obtained wave field data, and extracting a wave packet signal h (t) when frequency dispersion does not occur in each spiral path according to spiral guided wave propagation characteristics; calculating a signal difference coefficient SDC of each spiral path by comparing the difference between f (t) and h (t); calculating the damage probability of each point position in the detection area by using the SDC; and judging the damage probability of all the point positions in the detection area through the damage probability threshold, and determining the damage position. According to the invention, only one pair of signal receiving and transmitting devices is arranged, so that the defects of the scanning area in the fuel rod cladding can be accurately detected and positioned by utilizing spiral guided waves.

A multi-voltage phase recovery device and method based on a photorefractive effect are characterized in that the photorefractive effect is utilized to replace a non-linear effect under a strong light condition, diffraction images after an optical system under different non-linear effect degrees are collected through a photoelectric detector, a reconstruction algorithm based on non-linear inversion is used, and a multi-voltage phase recovery model is obtained. Reconstructing amplitude and phase information of the sample to be measured; compared with a traditional linear multi-plane phase recovery method, the method has the advantages that the multiple diffraction images can be obtained only by changing the voltage without mechanical displacement, the axial mechanical displacement error and the transverse alignment error of the multiple images can be avoided, and therefore the precision is higher, and the convergence speed is higher.

Disclosed are a light guide device, a light guide assembly and a display equipment. The light guide device includes a substrate including two opposite surfaces and a sidewall connected between the two surfaces; a coupling-out pupil expansion region provided at the surface; and a reflection layer, wherein a reflection interface of the reflection layer is towards an interior of the substrate and is provided on a diffraction light path of the coupling-out pupil expansion region. The coupling-out pupil expansion region is configured to perform multiple diffraction light splits to coupling-in light coupled into the substrate, and the reflection interface is cooperated with the coupling-out pupil expansion region to reflect the light after multiple diffraction light splits through the coupling-out pupil expansion region and reflect the light through the coupling-out pupil expansion region for coupling-out imaging.

The present invention relates to the field of optoelectronics technology, and discloses a two-dimensional acousto-optic device, comprising a bracket, a housing, an acousto-optic medium, a first transducer, a second transducer, and a matching circuit. The acousto-optic medium comprises a first mounting surface, a second mounting surface, a light-transmitting surface, a first reflective surface, a second reflective surface, and an inclined surface. The first mounting surface is adjacent to and perpendicular to the second mounting surface, the light-transmitting surface is perpendicular to the first mounting surface and the second mounting surface, respectively. The first reflective surface, the second reflective surface, and the inclined surface are all rough surfaces, and the inclined surface is at an angle to the light-transmitting surface and is not perpendicular. The first transducer is mounted on the first mounting surface, and the second transducer is mounted on the second mounting surface. As rough surfaces, the first reflective surface, the second reflective surface, and the inclined surface scatter most sound waves. Since the inclined surface is at an angle to the light-transmitting surface and is not perpendicular, the sound waves reflected by the inclined surface have difficulty passing through the region of incident light. The incident light does not enter the refractive index grating formed by the reflected sound wave at a Bragg angle, and thus does not cause multiple diffractions.

The application provides an image recognition simulation model and system, the image recognition simulation model comprising: an optical diffraction neural network for a handwritten digit recognition task, the optical diffraction neural network comprising: an input layer, a diffraction layer and an output layer; the input layer modulates incident light into a wavefront array carrying image information; the diffraction layer performs multiple diffractions on the light output by the input layer to simulate a convolution weight matrix, and adjusts a phase distribution in a manner of error back propagation; and the output layer generates a focused light spot corresponding to the number of categories, the focused light spot focusing on a number corresponding to a plurality of detection points, and a detection surface light spot intensity distribution of the focused light spot is used to represent a classification probability. Through nano structure design, high degree of freedom regulation of light field amplitude, phase and polarization is realized in a two-dimensional plane; meanwhile, through multi-layer cascading extension network depth, feature abstraction capability is improved, nonlinear mapping is realized through multi-layer cascading diffraction, and a classification light intensity distribution is directly output, and the light intensity distribution represents a classification result.

The embodiment of the present application discloses a diffraction optical waveguide and an augmented reality display device, wherein the diffraction optical waveguide comprises: a waveguide substrate and an in-coupling grating, a turning grating, and an out-coupling grating arranged on the waveguide substrate; the in-coupling grating is used to couple light into the waveguide substrate and propagate toward the turning grating; the turning grating is used to deflect light to propagate toward the out-coupling grating; the out-coupling grating is used to couple light from the waveguide substrate into the human eye; wherein the turning grating has multiple diffraction turning regions, and the boundary lines of at least two of the diffraction turning regions match the transmission direction of the light after being deflected by the turning grating. The diffraction optical waveguide provided in the embodiment of the present application can, to a certain extent, avoid the problem of dark or bright areas in the shape of stripes appearing in the displayed image after the turning grating is partitioned, thereby weakening or even eliminating the display problem of dark or bright areas, and optimizing the brightness uniformity of the display.

A diffractive optical element (104) for calibrating a camera (102) has a microstructure shaped to diffract a monochromatic plane wave (108) incident on the diffractive optical element (104) into multiple diffraction orders with different but known propagation directions surrounding a zero order, wherein each of the diffraction orders can be projected as a point of a diffraction pattern onto a camera sensor (112) of the camera (102).

The application discloses a kind of microscopic imaging device and super-resolution microscopic imaging method, comprising: sample table, for containing sample;Laser, for emitting laser;First digital micro mirror, for receiving laser, produce diffraction light;Light collection unit, for converging multiple diffraction light, form structured light, to excite the fluorescence carrying sample information;Second digital micro mirror, receive fluorescence and convert fluorescence into random binary encoding image;Image acquisition unit, for receiving image and transmission to processing unit;Processing unit, based on complex random binary encoding image reconstruction microscopic super-resolution image;First digital micro mirror, second digital micro mirror and image acquisition unit communication connection, second digital micro mirror controls the grating pattern conversion frequency of first digital micro mirror, and controls the image acquisition frequency of image acquisition unit.The application can protect biological cell sample from the invasion of phototoxicity and photobleaching, realize super-resolution imaging in structured light illumination microscopic system.

The present invention provides an automatic test method and system for the diffraction efficiency of volume gratings based on a tunable laser. The method includes: setting the initial test parameters of the tunable laser, the constant temperature chamber, the optical power meter, and the optical wavelength meter; connecting the volume grating to be tested to the tunable laser, and obtaining the measurement data of the optical power meter and the optical wavelength meter at different spatial positions of the actuator; analyzing the obtained measurement data to obtain the change relationship curve between the output optical power of the light of multiple diffraction orders of the volume grating to be tested and the resonant output wavelength; analyzing the change relationship curve to obtain the relative diffraction efficiency distribution data of the volume gratings to be tested at different orders. The present invention can automatically test the relative diffraction efficiency of volume gratings of different batches, different wavelengths, and different diffraction orders of the same wavelength, and automatically analyze the test results of the output optical power obtained by the test, so as to achieve accurate and rapid testing of the characteristic parameters of the volume gratings.

The utility model relates to a uniform square thermal excitation device, and belongs to the field of nondestructive testing. The problems that excitation to a large surface is not uniform and adaptability to small defects is poor in a common technology are solved. Comprising a fixing support, a cooling fin, an integrated reflecting cover, a lamp source, a lamp source fixing piece, a lens frame, a multi-diffraction lens, a lens front cover plate and a square fairing, the fixing support and a cooling fan are fixedly installed at the upper end of the integrated reflecting cover, and the lens frame, the multi-diffraction lens and the lens front cover plate are connected to the lower end of the integrated reflecting cover in series. The light source is fixed on the light source fixing piece, the light source fixing piece is fixed on one side of the integrated reflecting cover, and the fairing is fixedly connected with the integrated reflecting cover and the lens frame. The problem that thermal excitation of a Gaussian light source is not uniform is solved by adopting the multiple diffraction lenses.

A position measurement encoder device includes a scale including a series of features readable by a read head to determine relative positions of the scale and the read head and diffract light into a plurality of diffraction orders; a read head including a light source for illuminating the scale, a first sensor, and a second sensor; wherein at least one diffraction order has an optical state that is different from an optical state of at least one other diffraction order, and is configured such that, by the optical state of the diffraction order, the signal sensed by the first sensor is formed from a diffraction order composition that is different from a diffraction order composition of the signal sensed by the second sensor.

The invention discloses a structured light digital speckle interference device and method capable of realizing in-plane deformation measurement, the device comprises a structured light illumination generation module, an imaging module and a data processing module, the structured light illumination generation module comprises a laser, a spatial light modulator, a TIR prism and a spatial mask plate, and the spatial light modulator is connected with the imaging module. The spatial light modulator is used for loading stripe modulation patterns which are in the first direction and the second direction and have different phase shift amounts so as to modulate the illumination light beam, multiple diffraction light beams propagating in the different directions are formed, and phase shift operation is achieved. The spatial mask plate only selects + 1st and-1st diffraction order light beams for interference so as to generate structural illumination light; the imaging module is used for recording corresponding digital speckle phase shift images under the structural illumination light with different directions and different phase shift amounts; and the data processing module is used for obtaining deformation information of the sample along different in-plane directions. The in-plane deformation measuring device can realize high-precision in-plane deformation measurement, is slightly influenced by environmental disturbance, and is compact and high in stability.

The invention provides a grating waveguide device for eliminating a central bright line and a waveguide system, the grating waveguide device comprises a waveguide substrate and a grating structure, and the grating structure is arranged on the waveguide substrate; the grating structure comprises a coupling-in grating, a turning grating and a coupling-out grating, and the coupling-in grating adopts a two-dimensional grating. An incident light beam is coupled into the waveguide substrate through the diffraction effect of the coupling-in grating to serve as a diffraction light beam for total reflection propagation in the waveguide substrate; a first part of diffracted light beams propagated in the waveguide substrate in a total reflection manner firstly enter the turning grating area, continue to be propagated in the total reflection manner through the waveguide substrate under the diffraction action of the turning grating and then enter the coupling-out grating area, and a second part of diffracted light beams propagated in the waveguide substrate in the total reflection manner directly enter the coupling-out grating area; partial light beams in the first partial diffracted light beam and the second partial diffracted light beam are coupled out of the waveguide through the diffraction effect of the coupling-out grating to form waveguide imaging; a waveguide imaging center bright line is eliminated by adjusting a grating structure and utilizing multiple diffraction.

The embodiment of the application discloses a kind of multi-node structure light field generation devices with interactive network characteristics, including transparent substrate and multiple diffraction modulation units, diffraction modulation unit is sheet fork grating, the number of sheet fork grating is at least three pieces, sheet fork grating is integrated and engraved on the surface of transparent substrate by laser direct writing technology, each sheet fork grating has independent light field phase modulation function, from the first engraved sheet fork grating, from below to above, each sheet fork grating is rotated around the axis in the same direction relative to the sheet fork grating of adjacent lower piece, and a constant misregistration angle is generated, the misregistration angle refers to the relative rotation angle between two adjacent sheet fork gratings, the product of the number of sheet fork gratings and misregistration angle is less than or equal to 360 °, the advantage is that multi-node structure light field with interactive network characteristics can be realized in high-dimensional parameter space, and the types and complexity of the generated light field are enriched.

The disclosure provides a true amplitude migration imaging method, device, equipment and storage medium, and belongs to the technical field of oil and gas exploration. The migration imaging method comprises the following steps: determining the position of a transmission point in a three-dimensional coordinate system, the transmission point being the position of a seismic wave source; diffracting simulated multiple waves with the transmission point as a diffraction point, the simulated multiple waves being generated based on actual multiple waves, the actual multiple waves being waves formed by multiple diffractions of the seismic wave in the stratum; obtaining a diffraction waveform diagram of the simulated multiple waves in the diffraction process; and obtaining a true amplitude migration image of seismic data based on the diffraction waveform diagram. Through the imaging method, the true amplitude migration imaging efficiency of seismic data can be greatly improved.

An optical element for augmented reality and other devices is described. The optical element includes a multilayer waveguide, an in-coupling element for directing imaging light into the multilayer waveguide, and an out-coupling element spaced apart from the in-coupling element for directing light out of the multilayer waveguide to form a virtual image in the viewing field of an observer. The out-coupling element is a diffractive optical element that includes two or more diffractive grating layers that differ in refractive index. Inclusion of multiple diffraction grating layers in the out-coupling element leads to an improvement in the brightness uniformity of virtual images produced by imaging light spanning a wide range of incidence angle.

The invention discloses a vehicle-mounted holographic display device and method and a vehicle, and belongs to the technical field of optics. The vehicle-mounted holographic display device comprises a holographic module, a projection module and a control module; the holographic module is provided with a plurality of diffraction structure units, and at least two diffraction structure units are configured to diffract incident light to different positions; the projection module comprises a plurality of light outlets, and the at least two light outlets are configured to emit light beams with different incident angles to the at least two diffraction structure units respectively; the control module is in communication connection with the projection module, and the control module is configured to control opening and closing of the multiple light outlets. Switching of privacy and sharing modes is realized in the same area by controlling opening and closing of a light outlet, light is accurately projected to human eyes by utilizing a holographic module, energy is prevented from being scattered to a depopulated area, brightness in the eyes is improved, energy consumption is reduced, the contradiction between driving safety and parking entertainment is solved, the use frequency of projection entertainment is improved, and meanwhile, the driving safety is improved. And the driving safety during driving is ensured.

The invention discloses a multi-view machine vision system based on a two-dimensional grating and a use method, and the system comprises an optical imaging module which is used for converging light field information of a target; the two-dimensional grating is used for enabling the converged light field to form a multi-stage diffraction image on an image plane; the plurality of image acquisition modules are used for recording the intensities of different diffraction order light fields of the two-dimensional grating to obtain a plurality of images with parallax information; and the image analysis and processing module is used for processing the acquired image to obtain parallax information of the target. According to the multi-view machine vision system, multi-view vision information with parallax can be obtained only through one imaging system, angle information of a target is obtained while the spatial resolution of the system is not reduced, the problem that the spatial resolution and the angle resolution of a traditional multi-view vision system are mutually restricted is solved, the two-dimensional grating machining technology is simple, and the machining cost is low. The system structure is simplified, the reliability is improved, and the cost is reduced.

The invention discloses a method and a system for testing residual stress of a 4H-SiC ceramic-based composite material, strain information of the material in different crystal directions can be comprehensively captured by selecting a plurality of diffraction mirror azimuth angles psi and setting the direction of a Phi angle, contingency of single-point or single-direction measurement is avoided, measurement is carried out according to diffraction peak positions and azimuth angles, and the residual stress of the 4H-SiC ceramic-based composite material is obtained. The invention provides an accurate, reliable and reproducible residual stress test method, which ensures that a test result is derived from real lattice strain of a material instead of indirect or empirical estimation, so that the accuracy of the test result is remarkably improved, the final residual stress is calculated according to multidirectional results, and the repeatability and reliability of the measurement result are improved. The analysis period is short and the feasibility is high.

The utility model relates to a multi-view display structure and an AR (Augmented Reality) system. The multi-view display structure comprises a laser scanning light source, a collimation light splitting element and a holographic optical element, the holographic optical element is arranged on the light emitting side of the laser scanning light source, and the collimation light splitting element is arranged in a light path between the laser scanning light source and the holographic optical element; the laser scanning light source is used for emitting scanning beams; the collimating and light splitting element is used for collimating a scanning light beam of the laser scanning light source and splitting the collimated light beam into light beams with a plurality of diffraction orders; the holographic optical element is used for respectively focusing the light beams of the plurality of diffraction orders to a plurality of discrete viewpoints; the collimation light splitting element copies a single beam of light emitted by the laser scanning light source into multiple beams of parallel light, and each diffraction order corresponds to an independent viewpoint, so that the number of exposure times required during preparation of the holographic optical element is reduced, an exposure light path is simple in design and convenient to construct, and the production difficulty and cost of a multi-viewpoint display structure are effectively reduced.

The invention discloses a terahertz on-chip diffraction neural network with a nonlinear function, which comprises an input end, an output end and a neural network array which are etched on a quartz substrate, and is characterized in that the neural network array is formed by connecting a plurality of diffraction layers and phase shift layers at intervals along the length direction of the quartz substrate; wherein a nonlinear layer is connected between at least one phase shift layer and a diffraction layer behind the phase shift layer, the input end is connected with an input signal channel of the neural network array through a microstrip line, received terahertz waves carrying information are transmitted into the neural network array, the diffraction layer is a branch line coupler array, the phase shift layer is a microstrip phase shift line, and the microstrip phase shift line is connected with the input signal channel of the neural network array. The nonlinear layer is composed of a plurality of Schottky barrier diodes and provides nonlinear operation for the neural network, and the output end is connected with an output signal channel of the neural network array. Through the on-chip structure integrated with the Schottky barrier diode, the nonlinear operation of the terahertz wave band diffraction neural network is realized.

The purpose of the present invention is to realize high resolution corresponding to a high number of optical divisions. This displacement measuring apparatus is provided with: a laser light source; a reuse-type multiple diffraction optical system that acquires diffracted light by causing light-source light emitted from the laser light source to enter a diffraction element as illumination light, and causes the diffracted light from the diffraction element to enter the diffraction element again as illumination light to obtain diffracted light; a frequency modulator that is incorporated in the optical path of the multiple diffraction optical system and performs frequency modulation on the diffracted light; an optical splitter that splits output light including diffracted light corresponding to a multiple modulation component formed as a result of passing through, a plurality of times, the frequency modulator incorporated in the optical path of the multiple diffraction optical system; and a phase detection device that extracts phase information related to the multiple modulation component from the output light split by the optical splitter.

The present invention discloses a fast air sterilizing apparatus based on a chamber for the circulating air stream sterilization which comprises from a UVC radiation source, which is focused by reflection on a filter grid made out of pure quartz microfibers which is 90% transparent by the UVC radiation, it produces through constructive interference a multi diffraction pattern with points of amplified relative intensity and this multi diffraction pattern irradiates deeply onto a new type of HEPA filter, with the result of destroying and eliminating all of the trapped into the filter pores pathogens such as microbes, fungi (aspergillus, Candida), Clostridium difficile, bacteria and viruses including SARS COV 2.