22 results about "Optical correlation" patented technology

The invention relates to the technical field of lighting electrical testing, in particular to a lamp testing system and method, and the system comprises an electrical parameter collection module, a harmonic analysis module, an optical collection module, a light fluctuation analysis module and an abnormality judgment module. Wherein the electrical parameter acquisition module is used for acquiring a real-time voltage waveform of an input end of a lamp; the harmonic analysis module is used for extracting a fundamental wave and each harmonic component and calculating a harmonic distortion rate; the optical acquisition module is used for synchronously acquiring light signal time sequence data of the light emitting surface of the lamp; the light fluctuation analysis module calculates the light fluctuation frequency of the light source; and the abnormity judgment module is used for generating an electrical-optical relevance index and comparing the electrical-optical relevance index with a preset threshold value so as to output a stroboscopic qualification judgment result of the lamp. According to the method, the accuracy of lamp stroboscopic detection and the causal identification capability are effectively improved by constructing the electrical-optical correlation index and realizing synchronous judgment.

Illumination device (10) for a motor vehicle headlight, which illumination device (10) comprises the following:at least one light module (11) for producing dipped beam distribution having at least one light source, which is designed to emit light,a bulb shield (20) having an optically relevant shield edge for producing an asymmetrical cut-off line, wherein the light module (11) is arranged on an upper side of the bulb shield (20) in the installed position of the illumination device (10) in a motor vehicle headlight and cooperates in combination with the optically relevant shield edge of the bulb shield (20) to produce dipped beam distribution,a projection lens (100) with an optical axis (B), which projection lens (100) is designed to image the light that can be produced by the light module in front of the illumination device (10) in a main emission direction, wherein the projection lens (100) has a light entry surface (110) and a convex light emitting surface (120) opposite the light entry surface (110), wherein the projection lens (100) comprises an optical device (200) arranged on the projection lens, which comprises a plurality of free-form lenses (210) each having an active surface (211), wherein the optical device is designed to direct part of the light entering the projection lens (100) and exiting via the active surfaces of the free-form lenses to a region above the asymmetrical cut-off line of the dipped beam distribution.

The present invention discloses a textile fabric color fastness dynamic evaluation system, and relates to the field of optical detection, and the textile fabric color fastness dynamic evaluation system comprises: a normalizing module used for grabbing a to-be-evaluated textile fabric and tightening the to-be-evaluated textile fabric; the excitation module is used for dynamically outputting optical signals with different wavelengths, intensities and irradiation angles to the fabric in the tight state; according to the method, optical related parameters are adjusted by adapting to the initial characteristics of the fabric, the integrity and the signal-to-noise ratio of signal acquisition are improved, the feature extraction accuracy is guaranteed, the fabric tightening state is scientifically controlled, damage is avoided, meanwhile, the consistency of test conditions is guaranteed, ambient light interference is effectively shielded, signal errors are reduced in combination with dynamic noise reduction and baseline correction, and the detection accuracy is improved. And the color fastness correlation signal is enhanced through feature fusion and normalization processing, so that the quantitative evaluation accuracy is improved.

The invention relates to the technical field of analysis and testing, in particular to a radiation refrigeration coating performance intelligent monitoring method and system.The radiation refrigeration coating performance intelligent monitoring method comprises the steps that multi-source monitoring data, coating preparation parameters and climate zone parameters of a radiation refrigeration coating are obtained; polarization optical analysis is carried out on data related to optics in the multi-source monitoring data, and a coating performance measured value of the radiation refrigeration coating is calculated based on a polarization optical analysis result. Inputting the multi-source monitoring data, the coating preparation parameters, the polarization optical analysis result, the coating performance measured value and the climate zone parameters into a pre-trained physical constraint deep neural network model to obtain a coating performance predicted value; correcting the climate zone parameters to obtain climate zone correction parameters, constructing a multi-climate zone differential degradation dynamic model according to the climate zone correction parameters, and inputting the coating performance measured value into the multi-climate zone differential degradation dynamic model to obtain the coating performance attenuation trend and the remaining service life. And generating a radiation refrigeration coating performance monitoring report.

A lighting device (10) for a motor vehicle headlamp, the lighting device (10) comprising: - at least one light module (11) for generating a dipped beam distribution by means of at least one light source, the light source being designed for emitting light; - a light barrier (20) having an optically relevant obscuring edge for generating a cut-off, wherein the light module (11) is arranged on an upper side of the light barrier (20) in a mounting position of the lighting device (10) in the motor vehicle headlamp and jointly acts in conjunction with the optically relevant obscuring edge of the light barrier (20) for generating a dipped beam distribution; - a projection lens (100) having an optical axis (B), the projection lens (100) being designed for mapping light, which can be generated by the light module, in a main radiation direction in front of the lighting device (10), wherein the projection lens (100) has a light entry face (110) and a convex light exit face (120) opposite the light entry face (110), wherein the projection lens (100) comprises optical means (200) arranged on the projection lens, the optical means comprising a plurality of free-form lenses (210) having a respective one acting face (211), wherein the optical means are designed for deflecting a portion of light, which is incident in the projection lens (100) and exits via the acting face of the free-form lens, onto a region above an asymmetric cut-off of the dipped beam distribution.

This paper proposes a relative positioning method for drones and unmanned vehicles. Instead of strategically placing multiple anchor points in the operating area, both drones and unmanned vehicles carry multiple UWB antennas. This method obtains the corresponding distance and azimuth between the drone and the vehicle, and combines this with altitude estimation to estimate the relative position of the drone and the vehicle. Furthermore, a system for UAV-UGV collaboration is proposed, integrating barometer and optical correlation flow data into an extended Kalman filter to provide sufficiently accurate and stable relative position data for feedback-controlled flight.

This invention discloses a method and system for detecting diffraction gratings in semiconductor laser processing, relating to the field of grating detection technology. The method includes: deploying a grating detection module in a semiconductor processing production line to perform two-way detection and correlation on the target grating, generating an acoustic-optical correlation fingerprint; based on a grating quality inspector deployed at the production line's quality inspection end, performing decoupling distribution based on grating parameters on the acoustic-optical correlation fingerprint, analyzing the distribution entropy value and performing weighted comprehensive calculations for each grating parameter to determine the grating quality coefficient; based on the grating quality coefficient, performing quality judgment and production line diversion management on the target grating; if judged as a good product, but the comprehensive entropy difference does not meet the preset relaxation, performing defect location and production line reflow management. This solves the technical problems of existing diffraction grating quality detection technologies, such as a single dimension, incomplete detection results, and insufficient accuracy, achieving the technical effect of improving the accuracy and comprehensiveness of diffraction grating detection results.

A STEM educational building set (i.e., apparatus) consists of a double-side multiplane imaging display device that provides two simultaneous and distinct 2D / 3D scenes. Viewers with polarized goggles can observe 3D multiplane scenes (i.e., a 3D scene for each axial plane) by displaying two laterally separated images of the same scene with different polarization. The building set teaches users optics, exposing them to refraction law, lateral magnification, optical two-dimensional projection, and three-dimensional imaging.

The present invention discloses a method and device for externally modulated Brillouin optical correlation domain reflectometry based on a large modulation center frequency. The method employs a function generator output signal as the input of a voltage-controlled oscillator, which in turn outputs a radio frequency signal with a large modulation center frequency and sinusoidal frequency variation over time as the radio frequency input of an electro-optical modulator. A laser emits continuous detection laser light, which is optically isolated and polarization-controlled before being modulated into modulated light by an electro-optical modulator. One path of the modulated light is amplified, filtered, and selected for a 1-order modulated light signal. This light is then passed through a circulator to obtain forward-propagating pump light, while the other path is passed through a delay fiber to control the order of the correlation peak and obtain reference light. The pump light generates backward spontaneous Brillouin scattered Stokes light in the sensing fiber to be measured. This Stokes light carries temperature information and is then photoelectrically converted and collected for analysis after colliding with the reference light. This method avoids the spectrum aliasing inherent in external modulation systems, effectively improving the spatial resolution and measurement range of the sensing system.

The application discloses a kind of multispectral optical fiber array illumination optical correlation imaging method and system, belong to optical correlation imaging field.The application is controlled by trigger module to rotate emission light source to phase modulation module, and is synchronously controlled;Every pulsed light source is divided into multiple, respectively by phase modulator modulation, and from light array as illumination light field output;Light echo signal is divided into multiple, first through optical filtering, secondly by corresponding wavelength detector photoelectric detection;When sampling data quantity satisfies, then using illumination light field data and echo signal data carries out image reconstruction.The application can fully utilize the super-high bandwidth of phase modulator by reasonably using the time division multiplexing rotation illumination method of different wavelength pulsed light source, improve the modulation rate of structured light, greatly shorten the data acquisition time of optical correlation imaging, speed up the imaging speed.

The embodiment of the application provides a kind of optical correlation calculation method and system based on light field inner product, belong to optical computing field.The method comprises: obtaining query vector and key vector;The query vector is optically encoded to generate query light field, and the key vector is optically complex conjugate encoding to generate key light field;The query light field and the key light field are loaded in different spatial regions of modulation plane according to preset spatial arrangement mode, and are introduced into corresponding spatial carrier frequency modulation respectively;Make multiplexed light field after loading propagate through optical propagation structure, and form light intensity distribution containing conjugate cross term on detection plane;Based on the light intensity distribution, the conjugate cross term is separated and extracted to obtain correlation response.The technical scheme of the embodiment of the application can reduce the electronic computing burden in correlation evaluation process, reduce system processing overhead, and improve the implementation capability of optical domain correlation information processing.

In observation of a distant object with a telescope or the like, it is required to remove noise in a visible light region such as atmospheric turbulence. Although a method using SPI has been proposed as a method for removing noise due to atmospheric turbulence, the resolution of observation in the visible region is low and atmospheric turbulence has not been removed, although remote monitoring is barely possible with the current SPI.SOLUTION: In order to solve the above problem, optical signals are acquired using a DMD and a plurality of photodetectors, and in a correlation process of imaging using the optical signals, optical correlation signals are acquired from selective wavelengths of the optical signals from the plurality of photodetectors, thereby simultaneously acquiring reconstructed images in a wide wavelength band. By mounting the DMD, the plurality of photodetectors, and the correlation process of this configuration on an imaging device or a magnifying optical device, it is possible to perform imaging instead of adaptive optics for suppressing spatial noise. As a light source, a reconstructed image is acquired for a wide range of wavelengths such as visible light, infrared light, and ultraviolet light.SELECTED DRAWING: Figure 1

An adjustment system (10) for a vehicle headlamp for adjusting an optically relevant component of the vehicle headlamp, wherein the optically relevant component is mounted on a frame (50), which is adjustable about a vertical axis (VA) and a horizontal axis (HA) passing through a fixed bearing point (FP) of the frame (50) at the fixed bearing point (FP).

Optical device (10) for a motorcycle headlamp, the optical device (10) comprising: - a primary optic (100) having a base body (110) and a plurality of light guide elements (120) for forming a light distribution in a main direction (X), wherein each light guide element (120) has a common light output surface (130) having an optically relevant area (131); - a holder (300); - a cover element (400) attachable to the holder (300), wherein the cover element (400) in combination with the holder (300) is configured to fix a position of the primary optic (100) between the holder (300) and the cover element (400) when the cover element (400) is attached to the holder (300), wherein the primary optic (100) comprises a stabilizing structure (200), wherein the stabilizing structure (200) is built as a protrusion protruding in the main direction (X) from the common light output surface (130), wherein the stabilizing structure (200) has a first support surface (210), and wherein the cover element (400) comprises a first counter support surface (410), wherein the base body (110) of the primary optic (100) comprises a second support surface (140), and wherein the holder (300) comprises a second counter support surface, wherein the first counter support surface (410) in combination with the first support surface (210) of the stabilizing structure (200) is configured to stabilize a position of a curved surface of the optically relevant area (131) of the common light output surface (130) of the primary optic (100) when the cover element (400) is attached to the holder (300).

The invention relates to the technical field of soil moisture detection, in particular to a method and a system for detecting moisture distribution pattern and moisture content among soil particles. Firstly, a stress balance method is adopted for preparing and drying a test soil sample, and the structural integrity of the soil sample is kept; gradually adding water by using a dripping method, and synchronously collecting the weight change of the soil sample and microscopic image data; performing registration on the image sequence by using an SIFT (Scale Invariant Feature Transform) algorithm, including feature point detection, descriptor generation, feature point matching and RANSAC (Random Sample Consensus) optimization, and eliminating the influence of expansion deformation of the soil sample; and finally, establishing a moisture-optical correlation model, converting the image into an HSV color space, establishing a mapping relationship between the pigment tracer parameter and the moisture content by using a convolutional neural network, and generating a moisture distribution thermodynamic diagram. According to the method, interference of detection on moisture distribution is avoided, registration under the expansion condition is achieved, and the moisture distribution pattern is captured more accurately.

The invention relates to a device (1) for measuring an optical element (2), in particular an optical element (116, 118, 119, 120, 121, 122, Mi, 207) of a lithography system, comprising at least: - a lighting device (3) comprising a light source (4) and a structuring device (5) for generating structured measurement radiation (6), - a collimator device (7) for illuminating the optical element (2) to be measured with the measuring radiation (6), - a detector device (8) for detecting the measurement radiation (6) emanating from the optical element (2) to be measured. According to the invention, it is provided that an optically relevant area (9) of the optical element (2) can be at least approximately completely covered by a cross-section (10) of the collimated measurement radiation (6).

An apparatus for optic fiber measurement based on Brillouin optical correlation domain analysis using pulse waveform control of bits is disclosed, the apparatus including a PRBS generation unit generating electrical two identical electrical pulse pattern signals so that a probe optical signal and a pump optical signal have a time difference, and generating a first PRBS signal and a second PRBS signal by distorting a per-bit pulse waveform of each two pulse pattern signals; a probe phase modulation unit performing phase modulation of the probe optical signal according to the first PRBS signal; a pump phase modulation unit performing phase modulation of the pump optical signal according to the second PRBS signal; and a BOCDA sensor unit measuring Brillouin gain spectrum by inputting the probe optical signal and the pump optical signal with the time difference to both ends of a sensing optical fiber.

The present application relates to the field of strawberry quality detection, and discloses a kind of strawberry pulp quality detection method based on multiple light scattering and light absorption, first adopt optical integrating sphere system in combination with reverse doubling integral method, systematic determination different multi-species and multi-harvest storage period under the key quality index of strawberry pulp, optical absorption and scattering characteristic signal parameter, by optical characteristic pretreatment, utilize partial least square regression algorithm to construct the optical correlation parameter system of strawberry during storage physicochemical quality, realize by the prediction of the physicochemical quality of strawberry pulp optical characteristics after storage.This application first determines the light absorption and light scattering characteristic response signal of the physicochemical quality of strawberry during storage, and innovatively develops a rapid evaluation method for the physicochemical quality of strawberry pulp.The present application can realize the rapid prediction of the physicochemical quality of strawberry pulp during storage, and provide a time-saving and cost-controllable quality management method for the sorting, storage and transportation of planting enterprises after strawberry picking.

The application discloses a kind of based on optical coherence tomography's fingerprint extraction method and related equipment, comprising: by the mode of optical correlation tomography, the three-dimensional image of fingertip is obtained, according to preset image reconstruction mode, three-dimensional image is reconstructed, obtains N layer two-dimensional subsurface fingerprint image, respectively to each layer subsurface fingerprint image is extracted, and the feature map corresponding to each layer subsurface fingerprint image is obtained, and all feature maps are weighted fusion, and obtain fusion feature map, based on fusion feature map, determine the position map and direction map of each minutia point of fingerprint, and the position map and direction map of each minutia point are as target fingerprint information, improve the quality of extracted fingerprint minutia information.

The invention discloses a method for assisting combined simulation field construction to carry out lens optical detection, and relates to the technical field of optical lenses, the method comprises the following steps: reading mechanical characteristics of a target lens, carrying out optical correlation analysis, and screening correlated mechanical parameters; a multi-lens combined simulation optical system is carried out, an optical path analysis module is combined to carry out optical path analysis and eccentric superposition by taking the optical curvature center of the lens as a reference, and an optical detection result is determined; building a performance attenuation module by taking the full life cycle of the lens as a benchmark, performing lens performance attenuation analysis, and determining an optical performance attenuation trend; performing deviation over-limit analysis on the optical detection result and the optical performance attenuation trend, determining an optical performance coefficient and marking an over-limit point; and generating a performance detection single column based on the optical detection result, the optical performance attenuation trend and the optical performance coefficient. The technical problems of low detection efficiency and poor accuracy of optical performance detection of the optical glass lens in the prior art are solved, and the technical effect of improving the detection efficiency and accuracy is achieved.

The invention discloses an optical fiber Fabry-Perot pressure sensor high-speed demodulation multiplexing system and method, and belongs to the technical field of optical fiber sensing. The invention aims to solve the problems of low demodulation speed, difficulty in realizing absolute cavity length measurement, easiness in crosstalk between channels, poor system expansibility and insufficient high-frequency dynamic pressure monitoring capability in the existing optical fiber F-P sensor multiplexing technology. The system comprises a broadband light source, an optical fiber coupler, N optical fiber circulators, N F-P pressure sensors, N high-speed correlation demodulation units, a signal generator, a piezoelectric ceramic driver, a data acquisition card and an upper computer. The high-speed correlation demodulation unit comprises a reference F-P interferometer with tunable cavity length and a photoelectric detector. According to the invention, all reference F-P interferometers are synchronously driven to scan the cavity length at a high speed, and optical correlation is carried out on reflected light of each sensor; synchronously acquiring multiple paths of photoelectric signals and driving signals; and the upper computer calculates the absolute cavity lengths of all the F-P pressure sensors.

The present application relates to a display module, which includes a display panel and a protective film arranged on the light-emitting side of the display panel; the protective film includes a first coating layer, the thickness D1 of the first coating layer monotonically decreases with respect to the refractive index n1 of the first coating layer, and D1 and n1 satisfy the following relationship I: wherein k is a constant greater than 0, and θ1 is the incident angle of the incident light incident on the surface of the first coating layer; the display module of the present application has a variety of protective films with different refractive indices and different thicknesses available for replacement. When the refractive index n1 and thickness D1 of the first coating layer satisfy relationship I, the protective film can match the original optical design of the display module, avoiding optical-related problems that occur after the protective film of the existing display module is replaced.