516 results about "Light propagation" patented technology

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.

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.

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 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 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 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.

The invention is suitable for the field of electrochemical luminescence detection equipment, and provides a dispersion device suitable for electrochemical luminescence detection, which comprises a monochromator body, the monochromator body is composed of a monochromator housing, a reflector assembly, a grating assembly, a collimating mirror assembly, a focus lens assembly, a slit, a flange snap ring and a flange; an M-shaped light path is arranged in the monochromator body, and a slit, a reflector assembly, a collimating mirror M1 in the collimating mirror assembly, a customized blazed grating G1 in the grating assembly and a focusing mirror M2 in the focusing mirror assembly are sequentially arranged in the light propagation direction. The customized blazed grating G1 is designed by adopting specific parameters including the scribed line density, the blazed wavelength, the notch groove depth and the groove width ratio, and primary light energy enhancement and secondary light intensity suppression can be realized; according to the invention, an optical filter is not needed, the diffraction efficiency of a monochromator is improved to 60-86%, the intensity ratio of luminol secondary light to primary light is less than or equal to 1.6%, the detection limit of ruthenium bipyridine is reduced from 100pmol / L to 50pmol / L, and the electrochemical luminescence detection device is suitable for various electrochemical luminescence detection scenes.

The utility model discloses a spectrum detection probe and a spectrograph, relates to spectrum detection analysis technical field, said spectrum detection probe includes the shell, wherein the shell is provided with light transmission port, and the shell is internally provided with incident light channel and receiving light channel, said spectrum detection probe also includes incident light subassembly and receiving light subassembly, the incident light subassembly is provided with light transmission port, and the receiving light subassembly is provided with light transmission port and receiving light channel. The incident light assembly is arranged in the incident light channel, the receiving light assembly is arranged in the receiving light channel, and the incident light channel and the receiving light channel are both communicated with the light transmitting opening. The incident light can pass through the light transmitting opening from the incident light assembly, the detection light can enter the light receiving assembly through the light transmitting opening, and an included angle exists between the light propagation direction of the incident light channel and the light propagation direction of the light receiving channel. The spectrum detection probe and the spectrograph provided by the utility model are used for measuring spectrum information of deposits, and have the advantage of high utilization rate of optical signals.

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 ridge waveguide and a separation waveguide, and the input coupling waveguide, the ridge waveguide and the separation waveguide are sequentially arranged in the light propagation direction; the input coupling waveguide is used for coupling an input optical signal to the ridge waveguide, and the input optical signal comprises two polarization modes; the vertical section of the ridge waveguide is in a step shape to form a vertical asymmetric structure, and the vertical section is perpendicular to the light propagation direction. And the separation waveguide 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 defects that the size is difficult to further reduce and the polarization extinction ratio is reduced in the prior art are overcome, efficient polarization mode hybridization is realized by increasing the asymmetry in the vertical direction, and miniaturization of the polarization separation rotator is facilitated.

This invention belongs to the field of wavelength division multiplexing optical communication technology, specifically relating to a reverse coupler based on a thin-film lithium niobate platform. The reverse coupler includes: a lithium niobate-on-insulator substrate, a first waveguide, a second waveguide, and a coupling region. The first and second waveguides are disposed in the device layer of the lithium niobate-on-insulator substrate. The first and second waveguides are arranged in parallel along the light propagation direction within the coupling region. A periodic grating perturbation structure is disposed on the first and / or second waveguides. This reverse coupler utilizes the grating perturbation structure to ensure that the modes of the two waveguides satisfy the phase matching condition. The optical signal input to one waveguide is reverse-coupled to the falling port of the other waveguide. Utilizing the large photoelectric coefficient of lithium niobate material, this reverse coupler can tune its spectrum under specific conditions by applying a voltage.

A ring resonator (10) and a NALM (20) configured as a saturable absorption mechanism constitute a laser oscillator. A multiport BPF (12) is provided to a path through which light propagates in the laser oscillator, the multiport BPF (12) passing light in a prescribed band of the propagating light, and branching light outside of the prescribed band as monitoring light (L). A photodetector (1) detects the monitoring light (L). A control unit (2) controls the oscillation state of the light propagating through the laser oscillator on the basis of the intensity of the monitoring light (L), thereby controlling the mode synchronization of the light propagating through the laser oscillator.

One among various embodiments discloses a method to generate sub-pixel shifted images. The method includes generating light by sequentially activating each of a plurality of light emitting elements arranged in a spatially non-uniform configuration, propagating the generated light through a layer supporting a specimen, and generating a plurality of output signals from an image sensor configured to detect the light propagated through the layer supporting the specimen, the plurality of output signals indicative of a plurality of sub-pixel shifted images. A high-resolution image of the specimen can be generated based on the plurality of sub-pixel shifted images. The plurality of light emitting elements is locatable over a first range of separation distances with respect to the layer, and the layer is locatable over a second range of separation distances with respect to the image sensor.

This invention relates to the field of Miniled surface light source structure technology, and in particular to a Miniled surface light source structure and its processing technology; it includes a liquid crystal screen, a diffuser, light-emitting units, a substrate, and a heat dissipation base plate; the diffuser is fixedly installed below the liquid crystal screen, multiple light-emitting units are fixedly installed below the diffuser, the substrate is fixedly installed below the light-emitting units, and the heat dissipation base plate is fixedly installed below the substrate; this invention increases the light-emitting area and optical consistency through a light guide layer and a reflective layer, and solves the halo phenomenon by blocking the light propagation within adjacent light-emitting areas through a grating; through the above methods, the gap between the backlight and the liquid crystal glass can be significantly reduced, the product thickness can be reduced, and the halo range can be reduced, resulting in higher dynamic contrast within a small area.

A strip-loaded optical waveguide includes a slab layer, a strip layer, and a cladding region. The slab layer has a first optical refractive index and a first width measured in a transverse direction that is perpendicular to a light propagation direction through the strip-loaded optical waveguide. The strip layer is disposed above the slab layer. The strip layer has a second optical refractive index and a second width as measured the transverse direction. The second width is less than the first width of the slab layer. The second optical refractive index is less than the first optical refractive index of the slab layer. The cladding region is disposed above the slab layer and above the strip layer. The cladding region has a third optical refractive index that is less than the second optical refractive index of the strip layer.

This invention relates to an integrated laser packaging structure suitable for automated mass production, comprising a packaging box containing an upper cooler, a lower cooler, a laser chip assembly, an optical propagation assembly, an electrical connection assembly, a heat sink, and an optical fiber tail. The lower end face of the upper cooler has an upper coupling groove, and the upper end face of the lower cooler has a lower coupling groove and a first mounting groove, forming a coupling cavity. The heat sink is located within the first mounting groove, and the upper end of the heat sink has a second mounting groove, in which the laser chip assembly is mounted. A mounting assembly is fixedly installed within the coupling cavity. The position of each component within the packaging structure is predetermined, eliminating reliance on semi-automated testing and modulation during assembly, making it suitable for assembly line production. Furthermore, the use of a grooved cooler structure instead of the traditional sheet-like structure of a cooler allows the laser chip assembly and optical propagation assembly to be located within the laser-fiber coupling space formed by the grooves, resulting in better temperature control.

The application discloses a method for stably preparing a nonlinear frequency conversion device and a corresponding wideband tunable laser, wherein duty cycle modulation is realized by deleting a specific position electrode distribution instead of precisely operating electrode width, so that the stability of the preparation process is greatly improved. In addition, by selecting, for example, magnesium-doped lithium niobate material to prepare the nonlinear frequency conversion device, a wideband optical window is ensured, by chirping the polarization lithium niobate along the light propagation direction, the frequency conversion spectrum is expanded, and by modulating the polarization duty cycle, the tuning curve is optimized, and the output power fluctuation is reduced.

The application provides an optical guiding head, comprising a fairing, a wide-angle optical system comprising part of the fairing, a transmission lens group designed in a transmission mode, a first detector, in the direction of light propagation, the optical components are sequentially arranged in the order of light propagation, a long-focus optical system comprising part of the fairing, an aberration correction lens, a coaxial Cassegrain form lens group, a residual aberration correction lens group and a second detector, a hole is formed in the aberration correction lens of the long-focus optical system, and the wide-angle optical system is nested between the long-focus optical system and the fairing. The guiding head provided by the application has the advantages of simple structure, easy popularization and application, and does not adopt a radar form in the distance measuring mode, but adopts an optical means, through the change of imaging information on the two detectors, the confidentiality can be effectively improved, the system has high precision, when the detonation distance is detected, the detonation precision of 0.2 m can be achieved, the data processing speed is fast, and compared with the traditional radar form, the cost is lower.

The present disclosure provides a head optical application device, a transcranial light regulation apparatus and a near-infrared apparatus. The head optical application device comprises a support component, an optical component, and deployable components. The support component is constructed to mount an optical component. The optical component is constructed to transmit light to or receive light from scalp. The deployable components are provided on the support component, and are constructed to deploy or gather the distal ends under the action of force caused by the surrounding environment. Without the need for providing an electrical driving apparatus, the distal ends of the deployable components can be inserted into the user's hair gap in a gathered state, and distal ends of the deployable components can part (push) the hair blocking light (aside) in a deployed state after insertion, improving the problem of low light propagation rate due to hair blocking.

An apparatus and method for adaptively calibrating a splicer are described. The method comprises receiving a first image of a portion of a hollow core fiber, the hollow core fiber comprising a splice produced by the splicer, wherein the portion of the hollow core fibre in the first image is proximate to the splice. The first image is analysed to detect a feature associated with the first image, the feature representing a property of the portion of the hollow core fibre. Using the feature, an adjustment to be made to a parameter of the splicer is computed, wherein the adjustment is computed so as to target one or more of a reduced optical propagation loss and a higher strength, of a subsequent splice of hollow core fiber which is produced by the splicer after initiating the adjustment. The method further comprises initiating the adjustment of the parameter of the splicer.

The invention provides an under-forest light spot space-time distribution simulation method and system based on anisotropic probability volume fraction, and the method comprises the steps: obtaining laser radar point cloud data of a target forest stand, and carrying out the preprocessing, and generating a standardized point cloud; constructing a forest probability density field: dividing a forest stand space into voxel grids, and for each non-empty voxel containing vegetation, extracting spatial distribution statistical characteristics of internal point clouds of the non-empty voxel and calculating an anisotropic extinction coefficient of each non-empty voxel; the method comprises the following steps: simulating the sun as a surface light source with a preset angular diameter, emitting light from an under-forest preset observation point to the surface light source, executing probability volume fraction light stepping in a forest probability density field, and obtaining the optical thickness by accumulating anisotropic extinction coefficients of all non-empty voxels on a light propagation path. And then calculating the transmittance of the light reaching the observation point, integrating the solar spectrum irradiance in a wave band and a time period corresponding to the photosynthetically active radiation, and generating a spatial-temporal distribution map of the photosynthetically active radiation under the forest.

The application provides an image generation unit and a head-up display system, relates to the technical field of display, and comprises a light source, a first polarization element, a liquid crystal display screen and a second polarization element; the light source is configured to emit an initial light beam; the first polarization element is located on a propagation path of the initial light beam and is configured to generate a first polarized light beam; the liquid crystal display screen is arranged at intervals with the first polarization element in a light propagation direction and is located on a propagation path of the first polarized light beam; a first air gap is formed between the liquid crystal display screen and the first polarization element; and a second air gap is formed between the liquid crystal display screen and the second polarization element; in the technical scheme, external light that flows in reversely and heat absorbed by the light source are all concentrated on the polarization plate, and the liquid crystal display screen is not bonded, so that the risk of screen burn-in of the display screen can be reduced.