718 results about "Light propagation" patented technology

The invention discloses an image recognition and correction system based on an optical model and environment perception, and relates to the technical field of image processing, and the system comprises an environment perception module which is used for collecting multi-medium refractive indexes, interface three-dimensional forms and initial image data through a refractive index sensor, a three-dimensional laser scanner and a visual camera; an environment perception data set is formed through dynamic correction and multi-source fusion; the optical model is constructed on the basis of environment sensing data, the light propagation path is calculated in combination with the interference compensation sub-model, and the interference compensation sub-model can quantify the interference influence by analyzing related data acquired by the environment sensing module for interference factors such as impurities and temperature gradient in a medium, so that the interference compensation precision is improved. The compensation term is generated and fused into the light propagation equation, so that the light propagation path is corrected, the calculation accuracy of the light propagation path is ensured, a firm and reliable data support is provided for subsequent image recognition and correction, and the precision and quality of image recognition and correction are improved.

The invention provides an underwater image enhancement method based on a U-Net backbone network and fusing a position sensing module, a double-branch attention bridge and a DCT frequency domain enhancement module, and aims to solve the problems of low contrast ratio, color distortion, detail loss and the like caused by absorption and scattering effects in the light propagation process of an underwater image, improve the image quality and improve the image quality. And the visual perception effect is improved. The method specifically comprises the following four main steps: firstly, acquiring and preprocessing initial data sets of different underwater scenes; secondly, extracting spatial relation information of the image through a position sensing convolution module, and enhancing image details; thirdly, a double-branch attention bridge module is used for further integrating local details and a global structure, and the response capability of a key area is enhanced; and finally, in combination with RGB and NIR modal features, weighted fusion of frequency-space features is realized through a DCT fusion enhancement module, so that detail information of the image is recovered, color deviation is corrected, and the definition and visual effect of the underwater image are remarkably improved. According to the method, the enhancement performance of the underwater image in a complex environment can be improved, and powerful support is provided for applications such as underwater detection, target detection, object recognition and image segmentation.

The invention discloses a light-emitting super-structure surface capable of realizing incoherent fluorescence holography and multi-dimensional super-structure display and a preparation method thereof. The light-emitting super-structure surface is mainly composed of an optical waveguide structure layer, a micro-nano structure layer and a fluorescence emission layer. The optical waveguide structure layer comprises a substrate and a waveguide layer and is responsible for guiding fluorescence propagation; the micro-nano structure layer is located above the waveguide layer, is composed of nano bricks and can regulate and control light; the fluorescence emission layer is arranged above the micro-nano structure layer, contains quantum dots and is excited by the pump light to emit fluorescence. The metasurface can regulate and control the emergent angle, wavefront and emergent intensity of fluorescent light and pump light, the time-space coherence of the fluorescent light is enhanced through the waveguide layer, and phase modulation is carried out by using a method based on a circuitous phase. Based on the super-structure surface, through the steps of fluorescence excitation, coherence enhancement, phase modulation, diffraction calculation, hologram generation, multi-dimensional display and the like, incoherent fluorescence hologram and multi-dimensional super-structure display can be achieved, and the functions of fluorescence nanometer printing and multi-channel holographic display are covered.

The invention discloses a blurred image NeRF modeling method, system and device based on a scattering light path model and a medium. The modeling method comprises the steps of blurred image initial pose calculation, camera pose interpolation, neural radiation field NeRF-based 3D scene modeling, scattering light parameter learning guided by an internal scattering light path model, blurred image synthesis prediction by using a scattering sensing volume rendering method, and parameter joint optimization based on blurred image luminosity loss. The system, the equipment and the medium are used for implementing the method. A light propagation phenomenon is represented as internal scattering of light at a medium or surface intersection point through an internal scattering light path model, a scattering light path direction and a sampling point distance are autonomously learned by means of a feedforward neural network, and image rendering is performed by integrating contributions of sampling points in the directions of a main light path and the scattering light path. The real imaging process of a blurred image in a complex illumination environment can be effectively simulated, the geometric ambiguity problem is effectively avoided, the convergence stability of the neural network is improved, and a finer reduction effect on geometric details of a fine object is achieved.

The utility model relates to a 4K fluorescent endoscope optical system, which comprises an objective lens system, a relay lens system and an eyepiece system which are sequentially arranged along the light propagation direction, and is characterized in that the objective lens system is of a reverse long-distance structure; the system comprises a sapphire protection lens, a negative focal power lens, a prism or a steering prism, a positive focal power plano-convex cemented lens, a positive focal power triple cemented lens and a first positive focal power double cemented lens which are arranged along a light propagation direction, the relay lens system comprises n relay lens groups, and each relay lens group is of a double telecentric structure. And the eyepiece system is arranged in the light transmission direction and is formed by symmetrically arranging two doublet rod lenses, n is an odd number, the eyepiece system is of an object space telecentric structure, and the eyepiece system comprises a second positive-focal-power doublet lens, a positive-focal-power lens and a sapphire lens which are glued into a whole in the light transmission direction. The structure of an optical system can be simplified, production and processing cost can be reduced, and 4K ultra-high-definition fluorescent laparoscopic imaging can be realized at the same time.

The invention relates to a large-view-field continuous zooming optical system from visible light to a near-infrared band. The system is sequentially provided with a front fixing group with positive focal power, a zooming group with negative focal power, a compensation group with positive focal power, a rear fixing group with negative focal power and an image plane I in the light propagation direction; wherein the zoom group is composed of a meniscus lens with negative focal power and a doublet lens; and the compensation group consists of a meniscus lens with positive focal power, a meniscus lens with negative focal power and a doublet lens with positive focal power. According to the invention, two groups of doublet lenses in different forms are adopted, a negative lens in one group of doublet lenses is crown glass with low refractive index and high Abbe number, and a positive lens in one group of doublet lenses is flint glass with high refractive index and low Abbe number; and in the other group of glued lenses, the negative lens is flint glass with high refractive index and low Abbe number, the positive lens is crown glass with low refractive index and high Abbe number, and the two types of glued lenses effectively control high-order spherical aberration caused by a large view field, correct field curvature and suppress chromatic aberration caused by a wide spectral range.

The invention discloses a building light environment neural network control system based on BIM, relates to the technical field of building intelligent control, and is used for solving the problem of poor intelligent illumination adaptive control. The method comprises the following steps: constructing a structure enhanced semantic map based on a BIM model, extracting a spatial structure attribute and a communication relationship to generate a node vector and an edge weight, and describing an illumination propagation relationship; the method comprises the following steps: constructing an original state vector by fusing sensing data and structural information, carrying out time sequence modeling by adopting a gated recurrent neural network, dividing four types of subspaces to express environment evolution characteristics, identifying a lighting task scene according to a current activity and time period, matching a control target, reasoning an adjustment direction, and screening a candidate action path; according to the method, the optimal strategy is generated and executed, user feedback is collected to construct behavior response factors, user preferences are updated, a preference closed-loop mechanism is constructed, illumination control cooperatively driven by structure perception, state evolution and user preferences is achieved, and the comfort, intelligence and energy saving performance of the building light environment are improved.

The invention specifically relates to an inspection image enhancement method for safety production, and relates to the technical field of image processing, and the method comprises the steps: collecting and preprocessing multi-source data; mie scattering characteristic analysis and transmissivity theoretical calculation; a transmissivity correction model driven by on-site concentration; carrying out image enhancement and noise reduction processing; and performing model optimization and safety production scene verification. According to the method, multi-source data acquisition and preprocessing comprehensively cover a safety production scene, and the influence of particulate matters on light propagation is accurately described by combining a Mie scattering theory and a transmissivity correction model driven by field concentration; actual interferences such as non-spherical particles, agglomeration effect and airflow unevenness are fully considered, and a pixel-level accurate transmissivity matrix is generated; differentiated noise processing is carried out for scenes with different concentrations, and key information such as equipment defects is effectively restored in combination with a detail enhancement strategy; the method provides a more reliable clear image for safety production inspection, assists inspection personnel and algorithms in accurately identifying hidden dangers, reduces the risks of missing inspection and false inspection, and guarantees the production safety.

An optical transmitter includes a distributed feedback (DFB) laser having an active region formed as a multiple quantum well (MQW) and a diffraction grating, an electro-absorption (EA) modulator having an absorption region formed as a MQW having a composition different from a composition of the DFB laser, a semiconductor amplifier (SOA) having an active region having a same composition as the composition of the DFB laser, a bent waveguide that rotates a light propagation direction, and a passive waveguide connected to the SOA and including a core having a band gap wavelength shorter than an oscillation wavelength of the DFB laser. A tapered region of the passive waveguide converts a width W1 of the passive waveguide connected to the SOA into a width W2 of a narrow waveguide region of the passive waveguide, and the passive waveguide is in contact with the end surface of the substrate.

Techniques for implementing image rotation control using reflective waveguide facets in an AR eyewear display system are disclosed. A facet (602) is disposed in a light propagation path located between a first surface (S1) and a second surface (S2) of a waveguide (600) and is arranged to guide propagation of light for a display through the facet from the first surface to the second surface. Using this configuration, light is transmitted through the facet as it guides propagation of the light from the first surface to the second surface, which reduces the amount of image rotations or inversions that would otherwise be induced in the waveguide using conventionally oriented facets and thus simplifies or optimizes the design of other aspects of an AR eyewear display system, such as display source placement or orientation or form-factor bulkiness.

A calibration system and related methods for optical phased array chips. The calibration system includes an adjustable mount module, an infrared microscopic observation module, an arrayed driver module, a two-dimensional laser beam scanning module, a photoelectric conversion module and an upper computer, and utilizes computer-vision-enabled positioning and phase error compensation algorithms as software components. Collimated laser is emitted from the target beamforming angle and aimed at the emission aperture of the chip, and is subsequently sampled by the array elements in a reversed injection manner. Based on the reciprocity of light propagation, by maximizing the power reversely output from the bus waveguide of the optical phased array chip, beamforming at the target angle is achieved supported by software implementations of optimization algorithms. The system and related methods are readily achievable, highly automated, and offers fast and batch calibration with relatively low expenses, good flexibility and long-term compatibility.

The invention relates to the technical field of virtual reality imaging devices, and discloses a moire-based virtual image display device, which comprises an image generation unit and a curved surface reflector, and is characterized in that light emitted by the image generation unit is reflected by the curved surface reflector to form an amplified virtual image; the image generation unit comprises a light source, an imaging unit and a grating which are sequentially arranged in the light propagation direction, the transverse size of an eye box of the virtual image display device is D, and the period of moire patterns formed by the imaging unit and the grating is larger than the eye box area size D by two times. By actively utilizing the moire effect, stray light energy is transferred to an effective visual area, the light utilization rate is improved, and the adverse effect of moire on an image is avoided; meanwhile, an existing peep-proof film is omitted, the material cost is reduced, and the adverse effect on definition caused by moire patterns generated by the peep-proof film and a pixel dual-period structure is avoided.

A method of measuring a 3D shape of an object comprising a target semi-transparent surface, the method comprising the steps of: with a projector, projecting a first light signal having a predetermined pattern and a predetermined frequency from at least one projector column towards at least one location on a scene; with an image capture device, receiving a second light signal from the at least one location of the scene at an image capture device pixel; measuring an intensity signal received at the image capture device pixel; with the measured intensity signal, generating a correspondence map between the at least one projector column illuminating the at least one location of the scene and the image capture device pixel with coordinates receiving the light signal from the at least one location of the scene; and with the correspondence map, determining 3D coordinates of the at least one location of the scene.

An optical device includes a transition unit in which a first waveguide and a second waveguide are disposed in an overlapped manner such that a magnitude relationship of an effective refractive index between the vertical modes propagating the first waveguide and the vertical modes propagating the second waveguide is inverted at the positions of input and output. The transition unit allows, at the input, the second waveguide to be a single mode waveguide and allows, at the output, the second waveguide to be a multi-mode waveguide through which TM0 light in the maximum vertical mode and light in a higher-order mode propagate. The optical device includes a removing unit that allows the second waveguide to be a single mode waveguide through which the TM0 light propagates by removing the light in the higher-order mode from the light received from the transition unit.

The invention relates to a preparation method and application of a black high-transmittance resin composite board, and belongs to the technical field of advertising materials. The resin is formed by compounding a black light-transmitting layer, a light guide layer and a diffusion layer, wherein the high-transmittance layer is prepared by modifying a carboxylated carbon nanotube with a silane coupling agent, polymerizing with a methyl methacrylate monomer, and directionally arranging in a magnetic field, so that high light transmittance and pure black appearance are realized; the light guide layer takes polycarbonate as a matrix, SiO2 microspheres are added, and the light transverse propagation efficiency is improved through hot press molding; the diffusion layer takes polymethyl methacrylate as a matrix, ZnO nanoparticles are added, a periodic microprism structure is processed on the surface, and uniform diffusion of light is realized. When applied to a lamp box, the light source is turned off to present a pure black appearance, and when turned on, the light source has high light transmittance and no mixed color, and is suitable for high-end advertisement display screens, vehicle-mounted lamp boxes and other scenes.

The invention discloses a pollen monitoring method based on Fourier-wavelet transform fusion, and belongs to the technical field of environment monitoring, and the method specifically comprises the following steps: S1, carrying out pollen sampling through a sampler, and obtaining a hologram of a pollen sample; s2, performing numerical reconstruction on the obtained hologram, and simulating light propagation by using Fourier transform and a frequency domain transfer function to obtain complex amplitude distribution on a reconstruction plane; s3, performing two-dimensional wavelet decomposition on the reconstructed image, and calculating a wavelet coefficient variance; s4, performing multi-scale depth fusion reconstruction, selecting a wavelet coefficient with the maximum variance by traversing different reconstruction depths, and performing fusion to obtain an optimal reconstruction image; s5, performing post-processing on the reconstructed image; and S6, detecting particles on the processed image, extracting morphological characteristics, and carrying out pollen particle classification, statistics and visualization based on the characteristics. According to the method, the reproduction and identification accuracy of the pollen particles in the lensless digital holographic technology is remarkably improved.

The invention relates to the technical field of image processing, in particular to a glass punching hidden crack detection method and system adopting image processing. Comprising the following steps: acquiring point cloud data of target glass, calculating the curvature of each region, and generating a curvature distribution diagram; simulating a light propagation path based on the distribution map, obtaining an illumination intensity adjustment coefficient, optimizing an illumination condition through adjustable light source equipment, and collecting an image data set; gaussian filtering is adopted to carry out de-processing on the image data, and then binarization processing is carried out to obtain a subfissure binary image; calculating length and width indexes of the crack according to the hidden crack binary image, determining a hidden crack position set, and aligning the hidden crack position set with the curvature distribution map to generate addition data; and finally, fusing the hidden crack position with the curvature distribution diagram to generate a preliminary report diagram, and generating a final hidden crack identification result through image synthesis. According to the invention, the detection precision of the hidden crack is effectively improved, and the method is especially suitable for detecting the hidden crack defect generated in the laser drilling process of a photovoltaic panel.

The invention relates to an optical lens, in particular to a refrigeration type medium-wave infrared continuous zoom lens suitable for a 1280 * 1024 detector, and aims to solve the problems that an existing medium-wave infrared continuous zoom lens is small in view field and difficult to meet the requirement of large-view-field search. The system comprises a front fixed group lens, a zoom group lens, a compensation group lens, a first rear fixed group lens, a second rear fixed group lens and a detector which are sequentially arranged along the propagation direction of incident light, the zoom group lens and the compensation group lens can move along the direction of an optical axis and are used for realizing continuous zoom imaging; the front fixed group lens comprises a first lens; the zoom group lens comprises a second lens and a third lens; the compensation group lens comprises a fourth lens and a fifth lens; the first rear fixed group lens comprises a sixth lens and a seventh lens; the second rear fixed group lens comprises an eighth lens, a ninth lens and a tenth lens. The invention has the advantages of large field of view and high imaging quality, and can meet the requirement of infrared target searching and tracking.

The invention discloses an in-situ harmful gas monitoring method for sewage treatment plant structures, and particularly relates to the field of in-situ harmful gas monitoring, and the in-situ harmful gas monitoring method comprises the following steps: collecting refractive index disturbance data of a local gas-liquid-gas interface caused by bubble release in a sludge tank or an anaerobic tank, and forming a refractive index distribution field changing along with time; and modeling an infrared light propagation path based on the refractive index distribution field, executing infrared absorption inversion operation, solving a first concentration result of the harmful gas, and establishing a mapping relationship between the first concentration result and the refractive index distribution field. Through coupling calculation of a refractive index distribution field caused by bubble disturbance and an infrared absorption inversion process, a reciprocating iteration and time sequence prediction chain is constructed so as to correct dynamic optical distortion and stably solve the real release intensity of harmful gas.

The invention is suitable for the technical field of optical design parameter optimization, and provides a design parameter optimization method and system for a long-optical-path gas absorption cell, and the method comprises the following steps: carrying out the theoretical verification of the feasibility of the lens parameters of a spherical reflector based on a theoretical model of a light propagation matrix, and obtaining the design parameters of the spherical reflector; determining an initial lens parameter and a key design parameter range; an optical cavity model composed of two spherical reflectors is established, and automatic ray tracing simulation is carried out according to the initial lens parameters, the key design parameter range and a preset stepping value; the simulation data are verified, the number of light spots is determined, and the optimal key design parameter combination enabling the optical path to be maximized is screened out according to the number of the light spots. The method is mainly used for designing a long-optical-path gas absorption cell in infrared absorption spectrum trace gas sensor detection, has practical significance, realizes verification of optimal design parameters, reduces development difficulty and improves development efficiency.

An assembly comprising a first and a second photonic integrated circuit (PIC) or a first and a second PIC stack, wherein the second PIC or PIC stack is rotated relative to the first PIC or PIC stack about a light propagation axis of couplers arranged between optical outputs of the first PIC or PIC stack and optical inputs of the second PIC or PIC stack, in particular rotated by ninety degrees.

The invention relates to the technical field of gem detection and three-dimensional modeling, in particular to a gem high-precision three-dimensional modeling and flaw detection method based on reverse engineering, which comprises the following steps: S1, fixing a gem to be modeled, and acquiring image data of different wavelengths by using a multispectral imaging device; s2, performing distortion correction, noise suppression and light intensity normalization processing on the multispectral image data; s3, based on the preprocessed multispectral image data, refractive index inversion is carried out in combination with a gem optical model and light propagation characteristics, and point cloud data containing space coordinates and refractive index information is generated. According to the method, the gemstone is subjected to multispectral imaging acquisition, and image preprocessing, refractive index inversion, point cloud processing and self-adaptive grid reconstruction are combined, so that high-precision three-dimensional modeling and defect marking are realized, and the problems that traditional gemstone detection mostly depends on manual observation, and due to the lack of multispectral information, the gemstone detection accuracy is low are solved. Therefore, the problem that internal defects cannot be accurately identified is solved.

The invention relates to the technical field of optical communication, and provides a polarization separation rotator and optical communication equipment. The polarization separation rotator comprises an input coupling waveguide, a conical waveguide, a phase difference introduction waveguide and a multi-mode interference coupler, wherein the input coupling waveguide, the conical waveguide, the phase difference introduction waveguide and the multi-mode interference coupler are sequentially arranged in the light propagation direction; the input coupling waveguide is used for coupling an input optical signal to the tapered waveguide; the input optical signal comprises two polarization modes; the narrow end of the tapered waveguide is arranged corresponding to the input coupling waveguide, and the wide end of the tapered waveguide is arranged corresponding to the phase difference introduction waveguide; the phase difference introduction waveguide is used for splitting the polarization mode into a polarization mode with a preset angle phase difference; and the multimode interference coupler is used for separating the optical signals in the two polarization modes so as to respectively transmit the optical signals to different output ports. According to the polarization separation rotator provided by the invention, the defect of low port isolation is solved, and the port isolation is improved while the wide-spectrum working bandwidth is realized.

The invention provides a data processing method and device of a detection device, equipment, a medium and a program product. The detection device comprises an active sensor and a passive sensor; the method comprises the following steps: acquiring depth data observed by an active sensor and image data observed by a passive sensor; wherein the light propagation paths of the active sensor and the passive sensor at least partially coincide, so that the depth data and the image data are located in the same coordinate system; and fusing the observed depth data and image data to obtain image data with depth information. According to the method, the fusion method of the depth data observed by the active sensor and the image data observed by the passive sensor is simplified, and the method is easy to implement.

The present invention discloses a refractive index sensor and measurement method based on a grating-prism system, belonging to the field of optical interferometry. The sensor comprises a sequentially arranged parallel light, a plane grating, a sample cell, a converging component, and a spectral analysis system. The sample cell is provided with a prism and a sample to be measured. The parallel light propagates through the plane grating, which splits the parallel light into multiple sub-beams. The sub-beams are then converged by the converging component and arrive at the spectral analysis system for refractive index measurement. The sensor uses a plane grating to periodically block the incident parallel light, splitting it into sub-beams. Each level of diffraction light in each sub-beam is considered a waveband. After the sub-beams propagate through the prism and the sample to be measured, the same-order sub-bands of any two adjacent sub-beams have the same phase delay difference. By selecting the same-order sub-bands to construct multi-beam interferometry, the sensor can simultaneously achieve low-cost, high-sensitivity, and high-resolution refractive index measurement.

The invention discloses a multi-core optical fiber amplifier with a large core-to-cladding ratio and a gain method. The multi-core optical fiber amplifier is characterized by comprising a multi-core optical fiber formed by a plurality of independent rare earth-doped fiber cores and a cladding structure located on the outer side of the multi-core optical fiber, the cladding structure is internally provided with at least one layer of low-refractive-index isolation region which is used for remarkably compressing the effective cladding area of pumping propagation and improving the capturing efficiency of the whole pumping energy, and the ratio of the total cross sectional area of the multi-core optical fiber to the effective cladding area is not less than 0.1. The low-refractive-index isolating layer is embedded in a conventional cladding structure, so that a pump light propagation area can be effectively compressed on an optical path, the relative proportion of the fiber core in the cross section is increased, the proportion (CCAR is larger than or equal to 0.1) of the total area of the fiber core to the cladding area is remarkably increased, and therefore the pump capture efficiency is improved.

The invention relates to the technical field of additive manufacturing, in particular to a photocuring printing scattering suppression method and system based on acousto-optic modulation. According to the method, in the photocuring printing process, an acousto-optic modulation device is used for generating a focused ultrasonic field in a printing material, specific refractive index distribution is formed in the material based on the photoelastic effect, and therefore a refractive index regulation and control area used for restraining and guiding scattered light propagation is constructed in a local space; therefore, the scattering effect is suppressed, and the forming precision and the structural fidelity are improved. The system comprises a photocuring device, a light source, a printing platform and an acousto-optic modulation device used for achieving the method, the acousto-optic modulation device is composed of an ultrasonic transducer and an acoustic lens, and the acousto-optic modulation device forms a focusing sound field under external excitation and works in cooperation with the light source. The method is suitable for photocuring printing of various high-scattering light-sensitive composite materials, comprises material systems containing particles, cells or components with remarkable refractive index difference, and has good material adaptability.

According to the present disclosure, an optical connector (20) is attached to an optical transmission line (10) including a base body (11) and an optical waveguide (12) stacked on the base body (11). The optical connector (20) has a first side surface (A1) facing an end of the optical transmission line (10) and a second side surface (A2) located on a side opposite to the side on which the first side surface (A1) is located in a light propagation direction and includes at least one first lens (225) formed in the first side surface (A1) so as to face an end surface of the optical waveguide (12) and multiple second lenses (226) formed at positions on the second side surface (A2), the positions facing the first lens (225) in the light propagation direction. The first lens (225) is smaller in number than the second lenses (226).

An optical modulator, including: a substrate; a plurality of electro-optic material layers formed on the substrate; and an electrode formed on the electro-optic material layer; wherein the electro-optic material layer has a patterned RF portion waveguide that applies a modulated signal and a patterned DC portion waveguide that applies a direct current bias signal; and on a section perpendicular to a light propagation direction, the sectional area of the DC portion waveguide is greater than the sectional area of the RF portion waveguide.

The invention relates to the technical field of optical scanning, and discloses an afocal optical system for scanning. Comprising an X-direction scanning galvanometer, a front lens group, a rear lens group and a Y-direction scanning galvanometer, the front lens group and the rear lens group are symmetrically arranged about a light convergence surface, the front lens group is located on the light emitting side of the X-direction scanning galvanometer, the rear lens group is located on the light emitting side of the front lens group, and the Y-direction scanning galvanometer is located on the light emitting side of the rear lens group; the front lens group comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are sequentially arranged along the light propagation direction; the rear lens group comprises a sixth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens which are sequentially arranged along the light propagation direction; wherein the focal length value of the afocal optical system is very large, that is, the focal power approaches to 0, so that after incident circular collimated light passes through the X-direction scanning galvanometer, the front lens group, the rear lens group and the Y-direction scanning galvanometer, the emergent light is still circular collimated light.