70 results about "Grating pattern" patented technology

The invention discloses a high-reflective surface defect detection method based on structured light and phase deflection, which belongs to the technical field of visual inspection, and comprises the following steps: generating a multi-frequency sinusoidal grating pattern by using a structured light module, and projecting the multi-frequency sinusoidal grating pattern to the surface of a detected object; multi-frequency phase shift coding is introduced, an absolute phase is calculated through a pilot frequency unwrapping method, a depth map obtained by the structured light is calculated, and a structured light point cloud is reconstructed; a unit normal vector is calculated, a Poisson reconstruction model is adopted to obtain a depth map obtained by phase deflection, and deflection point cloud is obtained; the structured light point cloud data and the deflection point cloud data are registered through an iterative nearest point algorithm and then fused to form a fused depth map; and determining a defect area by adopting the maximum principal curvature and the minimum principal curvature combined mask. By means of the mode, the limitation of a traditional three-dimensional measurement means in high-reflection and complex-curvature surface defect recognition is solved, and submicron-level three-dimensional deformation detection precision is achieved.

The invention discloses a machining method of an integrated code disc and the integrated code disc, and relates to the technical field of servo motor code disc machining.The machining method of the integrated code disc comprises the steps that S100, a metal bottom support which is tested to be qualified is selected; s200, the surface of the metal bottom support is ground and polished; s300, the polished metal bottom support is cleaned; s400, the surface of the cleaned metal bottom support is coated with a film; and S500, etching a grating pattern on the surface of the coated metal bottom support to form the integrated code disc. The machining method of the integrated code disc and the integrated code disc are low in machining cost and high in precision.

This invention discloses a three-dimensional contour measurement method and apparatus based on multi-projection gratings, relating to the field of three-dimensional topography measurement technology. The method includes: obtaining intrinsic and extrinsic parameters through calibration; projecting a set of speckle patterns; preliminarily analyzing the surface topography gradient of the object to determine a non-uniform spatial frequency sequence; sequentially projecting and acquiring multiple sets of phase-shifting grating patterns, and calculating the wrapping phase map corresponding to each frequency; for the same pixel, based on its reliability assessment in wrapping phase maps at different frequencies, assigning confidence weights to the phase values ​​of each frequency, and calculating and optimizing the phase map and the corresponding fused confidence map; calculating gradient information and combining it with the fused confidence map to perform region division, and executing a region-guided path consistency verification unfolding algorithm to obtain the absolute phase; converting the absolute phase into three-dimensional point cloud coordinates of the object surface. This application aims to solve the problems of complex topography, discontinuities, and noise easily leading to unfolding path errors and order jumps during phase unfolding.

The application discloses a laser scanning welding system and method for ultrathin high polymer diaphragms, aiming at solving the technical problem that the ultrathin diaphragm is easy to deform during welding. The system comprises an ultrasonic welding module, a laser welding module and a spatial frequency domain imaging module. During welding, the edges of the upper frame of the diaphragm, the ultrathin high polymer diaphragm and the lower frame of the diaphragm are first positioned by preliminary spot welding through the ultrasonic welding module; then, the laser welding module utilizes the characteristics that the upper frame of the diaphragm is transparent and the lower frame of the diaphragm is light-absorbing, so that the laser penetrates the upper frame and performs scanning welding at the contact interface of the diaphragm and the lower frame, realizing fusion; in this process, the spatial frequency domain imaging module projects a grating pattern on the surface of the diaphragm and analyzes the deformation, calculates the welding thermal field distribution in real time, and then feeds back the control of the laser parameters, so that the deformation amount of the diaphragm is always within the controllable range. The application realizes high-precision, low-heat-affected and non-deformation welding of the ultrathin high polymer diaphragm.

An angular sensitive time-of-flight position sensor device is provided and includes an array of pixels each comprising: a planar waveguide structure; a collection area with a grating pattern at a specific periodicity to couple incident light into the planar waveguide structure; at least one detector placed outside of the collection area and in a plane different from that of the planar waveguide structure; an output coupler to direct the light from planar waveguide to the at least one detector; a mask to shield the at least one detector from direct illumination; a narrow band light source that illuminates a field-of-view; a first electronics configured to detect the time-of-flight of light retroreflected, scattered, or both incident onto the position sensor and configured to provide distance ranging information; and a second electronics configured to interpret and retain time-of-flight information and configured to communicate with external electronics for system applications.

This application provides a driving method for a silicon-based liquid crystal, a silicon-based liquid crystal, and a wavelength selective switch, relating to the field of optical switching engine technology. This driving method for the silicon-based liquid crystal can reduce the risk of instantaneous excessive power while shortening the switching time. The driving method includes: dividing the area of ​​the silicon-based liquid crystal that receives a single-wavelength optical signal into M sub-regions, where M is a positive integer greater than or equal to 2, and each sub-region includes at least one row of pixels; sequentially refreshing the M sub-regions to form a first grating pattern, wherein at least two sub-regions have different overshoot power outputs of optical signals based on the first grating pattern; sequentially refreshing the M sub-regions to form a second grating pattern, the second grating pattern being determined by the output angle of the single-wavelength optical signal and the steady-state power of the single-wavelength optical signal; the difference between the overshoot power and the steady-state power of the single-wavelength optical signal output from the area covered by the light spot is less than a preset value.

The invention discloses a programmable optical frequency comb light source based on a dispersion reconfigurable microcavity, and the structure of the programmable optical frequency comb light source comprises a grating writing and dispersion detection module, an integrated microcavity module with a photoinduced refraction characteristic, an optical comb pumping and spectrum sensing module, and a feedback control and signal processing module. The working principle is as follows: on a micro-ring resonant cavity with a photorefractive effect, laser is written into a programmable Bragg grating, so that a dispersion curve of the micro-cavity is reconstructed in real time; then, an intelligent feedback closed loop is formed by monitoring the spectrum and repetition frequency of the output optical comb and comparing the spectrum and repetition frequency with a target set by a user, and the grating pattern is automatically adjusted until the output spectrum is matched with the target. The programmable optical frequency comb light source can be dynamically reconstructed or switched according to different application requirements. The programmable optical frequency comb can be used as a light source module of a co-packaging optical technology, bandwidth density is improved, power consumption is reduced, and therefore the programmable optical frequency comb can be widely applied to interconnection of next-generation data centers.

This invention discloses an electronic cigarette with a dynamic grating pattern effect, including a main unit and an atomizer electrically connected to the main unit. The main unit has a panel assembly, which includes a light-transmitting sheet exposed outside the main unit, a grating plate corresponding to the back of the light-transmitting sheet, and a pattern plate pasted on the back of the grating plate. The pattern plate has multiple images corresponding to the grating plate. Rotating the main unit causes the images to diffract through refraction by the grating plate, and the movement or switching of the images can be observed outside the main unit through the light-transmitting sheet. The main unit has a light panel corresponding to the pattern plate, and a power supply assembly for powering the light panel and the atomizer. This invention, through the design of the panel assembly and light panel, allows the images to change dynamically when the main unit is rotated, making the electronic cigarette not only fun and playable but also more aesthetically pleasing. Furthermore, the aesthetic appeal is enhanced at night by the light from the light panel.

The invention belongs to the technical field of infrared optical devices, and particularly relates to a long-wave infrared band 8-12 [mu] m narrow-band polarization-independent notch filter and a method. The long-wave infrared band 8-12 [mu] m narrow-band polarization-independent notch filter comprises a polished ZnSe substrate, a Ge zero-contrast grating layer, a ZnSe anti-reflection grating layer and two double-layer grating structures, and the two double-layer grating structures are in orthogonal cascade connection and used for achieving the polarization-independent characteristic. The preparation of the optical filter is completed through the six steps of substrate pretreatment, Ge film deposition through electron beam evaporation, grating pattern formation through laser direct writing gray exposure, Ge grating structure preparation through inductive coupling plasma etching, and ZnSe anti-reflection grating layer and orthogonal cascade double-layer grating structure deposition. The preparation method adopts the processes of laser direct writing, ICP etching, electron beam evaporation coating and the like, solves the problems of time consumption of traditional multilayer film deposition, polarization sensitivity of an existing GMR device and the like, and is suitable for the field of long-wave infrared photon and optoelectronic devices.

The invention discloses a laser scanning welding system and method for an ultra-thin polymer vibrating diaphragm, and aims to solve the technical problem that the ultra-thin vibrating diaphragm is easy to deform during welding. The system comprises an ultrasonic welding module, a laser welding module and a spatial frequency domain imaging module. During welding, firstly, the edges of the vibrating diaphragm upper frame, the ultra-thin polymer vibrating diaphragm and the vibrating diaphragm lower frame are subjected to preliminary spot welding positioning through the ultrasonic welding module; then, the laser welding module enables laser to penetrate through the upper frame according to the characteristics that the upper frame of the vibrating diaphragm is transparent and the lower frame of the vibrating diaphragm absorbs light, scanning welding is conducted on the contact interface of the vibrating diaphragm and the lower frame, and fusion is achieved; in the process, the spatial frequency domain imaging module projects grating patterns to the surface of the vibrating diaphragm and analyzes deformation of the vibrating diaphragm, welding thermal field distribution is calculated in real time, laser parameters are fed back and controlled, and it is ensured that the deformation amount of the vibrating diaphragm is always within a controllable range. According to the invention, high-precision, low-heat-influence and deformation-free welding of the ultrathin high-molecular vibrating diaphragm is realized.

The utility model relates to the technical field of semiconductor thin films, and discloses an optical coating structure of a multi-junction solar cell, which comprises a solar cell chip, an antireflection film connected to the solar cell chip and a fourth material layer connected to the antireflection film, the antireflection film comprises at least one first material layer, at least one second material layer and at least one third material layer which are sequentially stacked on the solar cell chip; wherein the fourth material layer comprises a submicron grating and a grating pattern groove, and the submicron grating is connected to the side, away from the second material layer, of the third material layer; and the grating pattern groove is connected and communicated to the third material layer through one side, deviating from the third material layer, of the submicron grating on the submicron grating. According to the multi-junction solar cell, the photoelectric conversion efficiency of the multi-junction solar cell is improved, and the sunlight reflectivity of the multi-junction solar cell is reduced.

The application provides a point light source inscription apodized fiber grating system and a method thereof. The system comprises: a laser for outputting inscription laser; a scanning reflection device for reflecting the laser output by the laser to an inscription area of an optical fiber and scanning the inscription area with the laser; an apodized inscription device for attenuating the power of the laser according to a predetermined attenuation curve; a laser focusing device for focusing the laser on the inscription area to form a grating pattern in the core of the inscription area; and a reference platform for mounting the laser, the scanning reflection device, the apodized inscription device and the laser focusing device. The system of the application effectively reduces the sidelobes on both sides of the resonance peak and improves the spectral characteristics of the fiber grating.

Device for measuring a radius of curvature. This device comprises: - an array (16) of Bragg gratings, each Bragg grating being fabricated in the core of a multimode optical fiber (14) and having at least three identical motifs aligned one behind the other, - a spectral analyzer (42) configured to: - emit, into the multimode optical fiber, an optical excitation signal the majority of whose power is within a wavelength range [λmin; λmax], then - establish a value for the radius of curvature from the measured amplitude of a power peak in the measured spectral response of a Bragg grating from the array (16), in which, for each Bragg grating from the array (16), the largest transverse dimension of the motifs of that Bragg grating is less than the wavelength λmin. Fig. 3

The utility model provides structured light three-dimensional modeling equipment, which comprises a projection module used for projecting a grating pattern formed based on a DeBruijin coding mode to the surface of an object to be measured, the projection module comprises a transmitting unit and a grating sheet, the grating sheet is provided with a grating stripe sequence formed based on the DeBruijin coding mode, and the transmitting unit is used for transmitting the grating stripe sequence to the surface of the object to be measured. Light emitted by the emitting unit passes through the grating stripe sequence of the grating sheet to form a preset grating pattern; the camera module is used for acquiring a projection image after the projection module projects the grating pattern to the to-be-measured object; and the control module is connected with and controls the projection module and the camera module, and is used for establishing a three-dimensional model of the to-be-measured object according to the projection image acquired by the camera module. According to the technical scheme, the structure is simple, cost is low, precision is high, small-batch production can be achieved, and application in the wide fields of industrial manufacturing, medical cosmetology, cultural relic protection and the like is completely met.

The invention discloses a non-uniform metal polarization grating structure based on equal spacing and a preparation method thereof, and belongs to the field of infrared polarization integrated detection.The preparation method comprises the following steps that firstly, a layer of metal film is evaporated on a super-flat double-polished silicon substrate through the electron beam evaporation technology, then a layer of dielectric film is grown on the super-flat double-polished silicon substrate through PECVD to serve as a hard mask, and then the super-flat double-polished silicon substrate is formed; and then, non-uniform grating patterns with equal intervals and unequal line widths are photoetched by adopting a stepping photolithography technology, the dielectric layer and the metal Al layer are etched by utilizing fluorine-based plasma and chlorine-based plasma respectively, and finally, the preparation of the non-uniform metal polarization grating is completed. According to the invention, by improving the grating structure, on the premise of not additionally arranging special process steps, the consistency and controllability of the exposure energy and the etching rate are realized, the problems of complicated exposure process, non-uniform etching rate and the like of the traditional non-uniform grating are successfully solved, and the quality and the performance of the non-uniform grating are remarkably improved.

Device for measuring a radius of curvature. This device comprises: - an array (16) of Bragg gratings, each Bragg grating being fabricated in the core of a multimode optical fiber (14) and having at least three identical motifs aligned one behind the other, - a spectral analyzer (42) configured to: - emit, into the multimode optical fiber, an optical excitation signal the majority of whose power lies within a wavelength range [λmin; λmax], then - establish a value for the radius of curvature from the measured amplitude of a power peak in the measured spectral response of a Bragg grating from the array (16), in which, for each Bragg grating from the array (16), the largest transverse dimension of the motifs of that Bragg grating is less than the wavelength λmin. Fig. 3

According to an embodiment of the present invention, the light guide device comprises an input diffraction element, a transfer diffraction element, and a substrate on which the input diffraction element and the transfer diffraction element are disposed. The transfer diffraction element includes two separately formed regions (a first region and a second region). The first region includes a first grating pattern. The height of the first grating pattern gradually decreases in a direction away from the input diffraction element. The second region includes a second grating pattern. The height of the second grating pattern may also decrease and then increase in a direction away from the input diffraction element.

A light guide device according to an embodiment of the present invention comprises: an input diffraction element; a transmission diffraction element; and a substrate on which the input diffraction element and the transmission diffraction element are disposed, wherein the transmission diffraction element includes a first region and a second region formed by dividing the transmission diffraction element in two, the first region includes a first grating pattern, the height of the first grating pattern changes with distance from the input diffraction element, the second region includes a second grating pattern, the height of the second grating pattern also changes with distance from the input diffraction element, and the height of the first grating pattern and the height of the second grating pattern may be different from each other.

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 application discloses a lens defect detection system and method using structured light, a structured light generation method and an image processing method thereof. The structured light projection scheme is adopted, the projected grating pattern is realized by programming, the fineness of the grating stripe can be adjusted according to the actual lens condition, and the defects of the lens surface in different conditions can be more clearly reflected. The designed structured light projection lens can effectively correct various aberrations and has good imaging quality. The projection lens is a zoom system, the focal length range of the system is 11mm-22mm, has a two-fold zoom effect, and can adapt to most lens sizes. The structured light projection system and the collection system adopt a symmetrical structure, can effectively eliminate system distortion and reduce errors. The image processing algorithm of the application can accurately obtain the lens surface defect information.

The present invention discloses a whole-room scanner, comprising a grating projection device disposed within a housing, the grating projection device being configured to project laser grating data according to a grating pattern provided by the device; a data feedback capture device disposed within the housing and data-connected to the grating projection device, the data feedback capture device being configured to capture and provide feedback on the laser grating data projected by the grating projection device; a data processing device disposed within the housing and data-connected to both the grating projection device and the data feedback capture device, the data processing device being configured to generate raw grating data for projection by the grating projection device, and to compare the data feedback from the data feedback capture device with the raw grating data to generate a measurement result; and the housing being mounted on a horizontal rotation device capable of driving the housing to rotate horizontally 360 degrees. This allows reverse engineering measurements of interior building spaces to be performed, enabling rapid and accurate modeling and the generation of files in various formats.

A light guide apparatus, according to an embodiment of the present invention, comprises: a plate portion in which light is totally reflected internally; a first diffraction portion diffracting the light, which is totally reflected inside the plate portion, to the outside; a second diffraction portion diffracting the light, which is incident into the plate portion, toward the first diffraction portion; and a camera module disposed adjacent to the first diffraction portion and into which the light diffracted by the first diffraction portion is incident, wherein the first diffraction portion and the second diffraction portion include a grating pattern having an inclination on an incident surface onto which the light is incident, and the plate portion is inclined toward an object.

The present disclosure provides a focusing and leveling measurement method and measurement system, which include: imaging an optical grating on the surface of a measured object through light beam illumination to form an optical grating pattern, which is further reflected onto an imaging plane of an optical sensor; encoding pixel points on the optical sensor to maintain or clear light intensity signals at the pixel points to form a digital grating pattern; the digital grating and the optical grating have the same duty cycle, and a preset difference between their periods; forming a synthetic grating pattern by overlapping the optical grating pattern and the digital grating pattern; after measurement, performing light intensity integration on the synthetic grating pattern to determine the displacement of the optical grating pattern on the imaging plane; and determining the height of the measured object surface based on a linear relationship between the displacement and the height of the measured object surface. Compared with the existing technology, the focusing and leveling measurement speed and accuracy can be improved, and the complexity of the measurement system can be reduced.

The invention discloses a real-time detection method of an echelette grating for environment perception and an environment perception system.The real-time detection method of the echelette grating for environment perception comprises the steps that S1, an original image is obtained in real time, and the echelette grating is projected towards a perception area, an original image fusing the visible light and the echelette grating in the sensing area is obtained through the camera module; s2, processing an original image; separating an image of the echelette grating from the original image, and storing the image as a first image; s3, performing cutting, denoising and feature enhancement on the first image to obtain a second image; s4, inputting the second image into a grating detection model in real time, and outputting a line pattern of the echelette grating; and S5, performing skeleton extraction on the line graph to obtain a skeleton graph, performing superposition display on the skeleton graph and the original image, and displaying the extraction effect of the echelette grating in real time. According to the technical scheme, the problem of how to stably and reliably identify and detect the echelette grating pattern in real time is solved.

The invention discloses a time super-resolution digital holographic measurement system and method based on frequency division multiplexing. The system comprises a light source, a collimation and beam expansion system, a beam splitter prism, a digital micromirror device (DMD), three 4f lens systems, a diaphragm, a reflector and a camera. Firstly, a DMD is used as a two-dimensional dynamic grating to be synchronized with camera hardware, and a binary grating pattern is dynamically loaded in a single exposure period of the DMD, so that reference light generates multi-angle diffraction; the first 4f system is combined with a diaphragm to filter out non-+ 1-order diffracted light; the second 4f system ensures that the reference light beams are overlapped on an image plane at different moments; the object light is modulated by an object and then interferes with the multi-direction reference light to generate a frequency division multiplexing hologram. When the refreshing speed of the DMD is higher than the frame rate of the camera, the frame rate of the system breaks through the limitation of the sampling rate of the camera, and time super-resolution imaging is realized; a camera is used for recording the frequency division multiplexing hologram in a single frame mode, dependence of a traditional multi-exposure method on synchronization precision is reduced, the experiment process is simplified, and environmental interference sensitivity is reduced.

The present disclosure relates to pretreating a magnetic recording head assembly for magnetic media drive. The magnetic recording head assembly comprises a slider having a media facing surface (MFS), a top surface disposed opposite the MFS, a trailing edge surface disposed adjacent to the top surface, and an optical grating disposed on the trailing edge surface. A vertical cavity surface emitting laser (VCSEL) device is mounted to the trailing edge surface of the slider. The VCSEL device is aligned with the optical grating. A magnetic recording head comprising a waveguide having a grating pattern and a light output pattern. The light output pattern can output in-phase or out-of-phase light. The grating pattern aligns with the optical grating and comprises a plurality of grating bumps. The grating bumps may comprise a high index material, and may have different dimensions.

The embodiments of the present application provide a display panel and a display device. The display panel includes a first light-emitting element, a first bonding layer, a second light-emitting element, a second light-emitting element, a second bonding layer, and a third light-emitting element and a grating pattern, wherein the grating pattern is at least arranged in the first bonding layer or the second bonding layer. The grating pattern includes two oppositely arranged sub-grating layers. By arranging the above-mentioned grating patterns in different bonding layers, when light passes through different sub-grating layers, it will be acted upon by different sub-grating layers in turn, thereby converging or gathering the light emitted by the light-emitting element, thereby reducing the problem of divergence of the emitted light, and effectively improving the light extraction rate and utilization efficiency of the light in the display area, while achieving the purpose of improving the display effect of the panel.

The utility model relates to the technical field of 3D books, in particular to a movable book capable of improving the smoothness of a linkage structure during page turning. Comprising a book shell and a book block connected to the interior of the book shell, the book shell is provided with a spine, a front cover connected to one side of the spine and a back cover connected to the other side of the spine, and the book block comprises multiple layers of book pages distributed in a laminated mode and grating pattern card paper movably connected to each layer of book pages; the structure matched with the grating pattern card paper to slide is arranged in the book page, namely, the lifting strip, the slip increasing sheet, the grating light-transmitting sheet and the negative sheet are utilized to form a special sliding space for containing the grating pattern card paper, so that the grating pattern card paper can stably and smoothly slide in the sliding space; by means of the design, the problems of blocking, excessive friction and the like possibly occurring in the moving process of the grating pattern card paper are effectively avoided, the smoothness of the linkage structure during page turning is greatly improved, and it is ensured that the moving effect can be smoothly shown along with the page turning action.

This device comprises: - an array (16) of Bragg gratings, each Bragg grating being made in the core of a multimode optical fiber (14) and comprising at least three identical patterns aligned one behind the other, - a spectral analyzer (42) configured to: - emit, in the multimode optical fiber, an optical excitation signal the majority of whose power is within a wavelength range [λmin; λmax], then - establish a value of the radius of curvature from the measured amplitude of a power peak of the measured spectral response of a Bragg grating of the array (16), in which, for each Bragg grating of the array (16), the largest transverse dimension of the patterns of that Bragg grating is less than the wavelength λmin.

The invention provides a multi-modal data collaborative data labeling method, system and device, and belongs to the technical field of data labeling, and the method comprises the steps: obtaining a color picture and surface attribute text data of a target commodity, and obtaining a deformed grating image sequence through projecting a coding grating pattern to the surface of the commodity and capturing deformed images from different angles; performing semantic analysis on the text data to extract a surface feature vocabulary set; the three-dimensional coordinates of the surface points are calculated by decoding the deformed grating image sequence, and a three-dimensional point cloud model is constructed; calculating local geometric feature parameters of the point cloud, and generating geometric feature descriptors to quantify the surface microstructure; performing spatial registration on the three-dimensional point cloud and the color picture to establish a mapping relation; on the basis of the mapping relation, the geometric feature descriptors and the surface feature vocabularies are associated and matched, the material and the process of the target area in the color picture are recognized, labeling information with attribute labels is generated, and accuracy and comprehensiveness of data labeling of the commodity picture can be achieved.