599 results about "Divergence angle" patented technology

The invention relates to the technical field of laser, in particular to a dual-wavelength narrow-linewidth laser output device and method.The dual-wavelength narrow-linewidth laser output device comprises a semiconductor laser unit emitting linearly polarized light beams, and a light beam conversion lens is used for achieving conversion of semiconductor laser fast-axis light beams and semiconductor laser slow-axis light beams; the light beam conversion lens is used for collimating and compressing a semiconductor laser fast axis divergence angle, and the slow axis collimating lens is used for collimating and compressing a semiconductor laser slow axis divergence angle; the linearly polarized light beam is divided into a first light beam and a second light beam through the rectangular prism; the first light beam sequentially passes through a first volume Bragg grating, a first reflector, a half-wave plate and a polarization beam combiner; the second light beam sequentially passes through a second volume Bragg grating, a second reflector and a polarization beam combiner; the dual-wavelength narrow-linewidth semiconductor laser can solve the problems of precise regulation and control and power amplification of the central wavelength of the dual-wavelength narrow-linewidth semiconductor laser, has power expansibility, and realizes improvement of laser power by stacking a plurality of laser units in the vertical direction.

The invention is suitable for the technical field of radars, and provides a radar control method and device, terminal equipment and a computer readable storage medium, and the method comprises the steps: controlling a laser radar to move for a preset step in a scanning direction after the laser radar completes a detection laser emission task of a current emission channel, and transmitting detection laser through a next emission channel, the emission task of the detection laser is completed by all the emission channels; wherein the preset step is smaller than the divergence angle of the scanning light spot of the current transmitting channel; filtering the echo data received by the current receiving channel according to the echo data received by the adjacent receiving channels to obtain a scanning result of the current receiving channel, and setting the moving step of the laser radar to be smaller than the divergence angle of the scanning light spot of each transmitting channel, so that the scanning light spots between the adjacent transmitting channels are overlapped to obtain a scanning result of the current receiving channel. The correlation of adjacent transmitting channels is improved, and the detection capability of the laser radar on a small target object is improved.

The invention provides an optical cross system based on silicon-based liquid crystal and a control method, and relates to the field of optical elements, and the optical cross system comprises an optical fiber array, a micro lens array, a collimating lens, a polarization conversion module, a dispersion element, a focus lens group and a liquid crystal spatial light modulator. Optical signals are coupled through the micro-lens array, a divergence angle is compressed, and parallel light beams are formed through the double-agglutination collimating lens; the polarization conversion module separates the light beam into P / S polarized light and unifies the polarization state; the dispersion element separates light beams according to wavelength space, and the focus lens group forms an elliptical Gaussian light spot on the liquid crystal spatial light modulator; the liquid crystal spatial light modulator divides a light spot into a plurality of independent control areas in the long-axis direction, and single-wavelength multi-port output, power proportion regulation and control and monitoring signal extraction are achieved by dynamically modulating the reflection phase of each area. The control method comprises the steps of optical path processing, regionalized phase modulation and real-time monitoring feedback. According to the invention, flexible routing, power balance and lossless monitoring of wavelength channels can be realized.

The invention provides a wafer detection device. The wafer detection device comprises a light source, wherein the light source emits initial light to a wafer to enable the wafer to emit scattered light beams; the first reflecting mirror is positioned on one side, facing the light source, of the wafer and reflects at least part of the scattered light beam into a first reflecting light beam; the first lens group is located on the side, away from the wafer, of the first reflector and adjusts the first reflection light beam into a first adjustment light beam, and the divergence angle of the first adjustment light beam is smaller than that of the first reflection light beam; and the first detector is arranged on one side, far away from the wafer, of the first lens group and receives the first adjusting light beam. Therefore, the obtained surface image of the wafer is clearer, the distinguished minimum particle size can be smaller, the detection sensitivity of the wafer detection device is higher, and small-size defects can be better detected.

The invention discloses a low-divergence-angle narrow-linewidth high-power semiconductor laser. Relates to the technical field of semiconductor lasers, in particular to a low-divergence-angle narrow-linewidth high-power semiconductor laser. According to the invention, the parabolic waveguide structure is etched in the light field expansion area, and the metal reflector is introduced to realize a novel light field expansion and metal reflector integrated structure, and the transverse divergence angle of a laser mode is reduced through the expansion structure at the tail end of the waveguide. The laser comprises a laser gain area, a light field expansion area and a spectrum purification area at the tail of the light field expansion area. The laser gain region, the light field expansion region and the spectrum purification region at the tail part of the light field expansion region are made of the same laser epitaxial material in the longitudinal direction, the laser gain region is adjacent to the light field expansion region along the horizontal light emitting direction, and the light field expansion region is adjacent to the spectrum purification region at the tail part of the light field expansion region along the horizontal light emitting direction; the longitudinal direction is the direction from the substrate to the contact layer.

A metalens used for beam shaping, beam-shaping system and the generating method of the metalens are provided by the present application. The metalens is used to shape an incident beam, and a divergence angle at least in one direction of an outgoing beam obtained by shaping is greater than the divergence angle in the same direction of the incident beam.

The invention discloses a MHz frame frequency high-speed spectral measurement system and method, and mainly solves the technical problems that a traditional spectrometer is low in frame frequency, cannot capture spectral change in a high-speed dynamic process in real time, is limited in application scene and the like. The spectral measurement system comprises a slit, a first collimating mirror, a spectral dispersion element, a spectral signal amplification module, a spectral coupling module, a spectral acquisition module and a data processing module, the slit is used for limiting an incident space of a light beam and changing a divergence angle of the light beam; the first collimating mirror is located on the side, away from the to-be-measured object, of the slit. The spectral dispersion element is located on a reflection light path of the first collimating mirror; the spectral signal amplification module is located on a diffraction light path of the spectral dispersion element; the spectrum coupling module, the spectrum acquisition module and the data processing module are sequentially arranged, the spectrum coupling module is used for focusing the spectrum band captured by the spectrum signal amplification module to form a spectrum image, and the spectrum image is acquired by the spectrum acquisition module and then transmitted to the data processing module.

The invention relates to the technical field of optical communication equipment testing, in particular to an integrated optical module multi-parameter testing system and method.The method comprises the steps that a multi-channel parallel testing unit synchronously collects light spot morphology, divergence angles, insertion loss and return loss space and transmission characteristic parameters through a transmission light path and a reflection light path; the parameter collaborative analysis module performs nonlinear correlation analysis and dynamic performance threshold evaluation based on a cross-dimension correlation model; the intelligent calibration engine dynamically adjusts the test benchmark and compensation parameters according to the environment temperature and the equipment aging attenuation model; the fault diagnosis and prediction unit identifies potential defect types of the collimator, constructs a performance degradation prediction model in combination with a working state and environmental stress, and predicts a performance evolution trend according to test data; and the test report generation module automatically generates a standardized and customized dual-mode test report, a quality grade label and a performance optimization suggestion according to the prediction result and the diagnosis conclusion. Therefore, the problems of poor test precision, low test efficiency and the like in the prior art are solved.

The invention relates to the technical field of microscopic imaging, and discloses a microscopic imaging system with resolution exceeding light spot size limitation. The system comprises a laser unit; the measured target unit is arranged in the reference arm light path; the tested target unit comprises a tested sample and a divergence angle adjusting element; the divergence angle adjusting element is used for adjusting the divergence angle of the reference light source passing through the tested sample; the spatial radio frequency marking unit comprises a reference arm light path and a measuring arm light path and is used for performing optical heterodyne interference processing on the laser beams according to the radio frequency driving signals of various frequencies to form a reference light source and a light spot array respectively; the reference light source enters the measured target unit and then is combined with the light spot array to generate a combined light beam; the image signal receiving unit is used for collecting the combined light beam and then generating light data; and the data processing unit is used for receiving the optical data and carrying out image inversion processing on the optical data to generate imaging data of the tested sample. According to the scheme, the resolution limit of the system is improved.

The invention relates to the technical field of axial focusing enhancement of a cyclotron, and provides an axial focusing enhancement method and system for a medical cyclotron, and the method comprises the steps: collecting vibration data, a beam intensity value, temperature data, the positions of all particles in a particle beam, the average magnetic field intensity, the magnetic field intensity difference, and the current; the divergence angle and energy of the particle beam are measured; determining an axial focusing effect evaluation value at the current sampling moment; determining the particle beam stability at the current sampling moment, and determining the magnetic field uniformity at the current sampling moment by combining the average magnetic field intensity and the magnetic field intensity difference at the current sampling moment; and the axial focusing effect evaluation value, the average magnetic field intensity and the current at the current sampling moment are combined to realize the axial focusing enhancement of the medical cyclotron. According to the invention, the focusing precision of axial focusing enhancement of the medical cyclotron and the stability of the focusing effect can be improved.

The invention discloses a non-contact measurement system and method for the longitudinal distance between objects, and the method comprises the steps: measuring the position distance between an object and an adjacent object in a size-limited space: placing a light source on the surface of a workpiece, projecting an electromagnetic beam with a set divergence angle to a reference object, and forming an amplified light spot; image information, especially light intensity information, of the light spot and a part of reference object where the light spot is located at the projection position is received through a light receiver; and then the processor processes the image information to obtain geometric data of the light spots, including the positions of the light spots on the reference object, the lengths of the obtained light spots or the distances between different light spots, namely the projection lengths, the projection height from the light source to the reference object is calculated in combination with the divergence angle, and the longitudinal distance between the workpiece and the reference object is obtained in combination with the height of the light source. As long as the size of the light source is small enough and the light source can be placed into the chamber for processing the wafer, the longitudinal distance between the wafer and the top of the chamber can be accurately measured at any time, and the measurement accuracy related to wafer manufacturing is greatly guaranteed.

The invention relates to the technical field of projection modules, and particularly discloses an LCOS laser projection module, which comprises a laser light source module, a laser speckle eliminator, a reflector, a diffuser, a collimating lens, a fly-eye lens, a relay lens, a first linear polarizer, a polarizing beam splitter, an LCOS chip, a second linear polarizer and a projection lens which are sequentially arranged along a light transmission path, the laser light source module is provided with a light source optical axis and is used for emitting light, and the light is projected by the projection lens after being modulated along a light transmission path to form a projection image. The light emitted by the laser light source has the advantages of narrow divergence angle, small light-emitting area and good light concentration and collimation, the resolution of a projected image can be improved, the projected image is bright in color and high in definition, and the requirements of simple structure and small size are met. Meanwhile, the laser speckle can be eliminated through the matching of the laser speckle eliminator and the diffusion sheet, and the projection image can meet the high contrast through the existence of the first linear polarizer and the second linear polarizer.

The utility model belongs to the field of laser application, and relates to beam shaping of a laser, in particular to a small-divergence-angle laser based on a beam shaping technology. The problems that in the prior art for laser diode collimation, astigmatism of the diode cannot be calibrated through single-lens collimation, and cost is increased due to the fact that fast axis collimation and slow axis collimation need to customize a fast axis collimating lens with a proper focal length are solved. The utility model discloses a small-divergence-angle laser based on a beam shaping technology. A first collimating lens, a fast-axis beam shrinking device and a beam expander are sequentially arranged on an emergent light path of a first laser diode; the light emitting point of the first laser diode is located at the focal point of the first collimating lens, the fast axis beam shrinking device comprises a first cylindrical lens and a second cylindrical lens, and the focal points of the first cylindrical lens and the second cylindrical lens coincide. According to the utility model, the divergence angle of the laser diode is reduced to 0.1 mrad, so that the diameter of a light spot at 500m is less than 100mm, and the actual light spot observed in an experiment is 80mm.

A handheld drone denial device, characterized in that the device comprises a laser emission unit comprising a high peak power pulsed laser and an adjustable beam expander, a sighting unit comprising a range finder and a sighting scope, a control unit comprising a denial device start and laser emission unit trigger switch, a power supply and a housing, the configuration of the laser emission unit, sighting unit, control unit, power supply, the structure of the housing and the arrangement of the units including the power supply on the carrier satisfy that the device discovers, locks and measures the range of a drone target through the sighting unit, manually or automatically adjusts the output laser beam divergence angle of the beam expander according to the range measurement result, and then or simultaneously triggers the laser emission unit trigger switch to emit laser to the drone target, wherein the adjustment of the beam expander includes that the adjustment of the beam divergence angle from a range of 500 meters to a range of 100 meters is incremental adjustment, or the adjustment of the beam divergence angle from a range of 100 meters to a range of 500 meters is decremental adjustment.

The invention provides a coupling system for an on-chip light source and a photon chip. The coupling system comprises an input light source, a collimating lens, a focusing lens, a reflecting prism and an on-chip grating which are sequentially arranged in the direction of a light path, and an optical waveguide located on the side face of the on-chip grating. The collimating lens is used for primarily shaping emergent light of an input light source into a collimated light beam, the focusing lens is used for focusing the collimated light beam to the on-chip grating, and the collimating lens and the focusing lens are both aspheric plano-convex lenses. According to the system, non-uniformity caused by a large divergence angle of the semiconductor laser is effectively corrected through the aspheric micro lens, output of approximately parallel light beams is achieved, the light beams are accurately focused to the photon chip grating through the aspheric focusing lens subsequently, the coupling efficiency of light energy is greatly improved, and compared with two cylindrical lenses in the prior art, the coupling efficiency of light energy is greatly improved. The design of the focusing lens and the reflector is added, so that the number of optical elements is reduced, and error accumulation is reduced.

The invention discloses a light spot beam divergence angle calculation method and device based on adaptive threshold correction and a medium, and relates to the technical field of laser communication. The method comprises the following steps: continuously acquiring a debugging light spot picture output by image acquisition equipment, and calculating the maximum gray value of the debugging light spot picture; based on the maximum gray value, the exposure of the image acquisition equipment is adjusted until an initial light spot picture with the maximum gray value and the number of pixels reaching a preset threshold value is output; based on a preset initial pixel threshold value, calculating a pixel value variance of the initial light spot picture, and updating the initial pixel threshold value until a target pixel threshold value enabling the pixel value variance to reach a maximum value is obtained; setting a pixel value lower than a target pixel threshold value in the initial light spot picture to zero to obtain a target light spot picture; and calculating a first moment and a second moment of the target light spot picture to obtain a light spot beam divergence angle of the target light spot picture. According to the method, the calculation precision of the beam divergence angle of the light spot is improved by adjusting a threshold selection mechanism for maximizing the exposure degree and the variance.

The invention discloses an underwater optical communication routing method based on a three-dimensional dynamic conical sector, belongs to the technical field of underwater wireless communication, and is used for solving the problems of poor routing stability, low communication success rate, high energy consumption, non-adaptive path and the like in the existing underwater optical communication network. The method comprises the following steps: constructing an underwater optical communication network model in a three-dimensional space, and defining a dynamic cone communication sector based on a divergence angle and a direction angle between nodes; discovering neighbor nodes through a conical scanning mechanism, and performing multi-index optimization on candidate forwarding nodes based on distance progress, expected progress, energy efficiency indexes and time delay indexes; selecting an optimal path according to an evaluation result; performing competition coordination among candidate nodes by using a fast time slot response mechanism, and selecting a next hop node; and completing path construction through hop-by-hop transmission, dynamically adjusting a divergence angle, and executing path maintenance and updating. The method does not need global topological information, and is suitable for an underwater communication scene with uncertain node distribution in a dynamic environment.

The invention relates to the technical field of lasers, and discloses a parameter design method of an optical system, the optical system, a device and electronic equipment, the optical system comprises a laser, an optical fiber and a collimating lens, the optical fiber is a rectangular optical fiber with a rectangular core layer or a barrel-shaped optical fiber with a barrel-shaped core layer, and the method comprises the following steps: according to the size and imaging distance of a first light spot, determining the size of the first light spot; determining the residual divergence angle of the laser after passing through the collimating lens; determining the focal length of the collimating lens according to the residual divergence angle and the side length of the core layer; according to the ratio of the focal length to the side length of a core layer, whether the optical fiber is determined to be a barrel-shaped optical fiber is determined, and the core layer of the barrel-shaped optical fiber is composed of a plurality of arcs; and under the condition that the optical fiber is a barrel-shaped optical fiber, determining the curvature radius corresponding to each arc in the plurality of arcs according to the focal length and the side length of the core layer. According to the invention, distortionless rectangular homogenized light spots can be obtained under a large divergence angle.

The invention discloses a safe and hidden quasi-omnidirectional full-duplex laser communication device, system and method, and solves the technical problems that the position and orientation of an existing laser communication system have a leakage risk, and the existing laser communication system is difficult to adapt to a wide-angle communication application scene due to a small receiving and transmitting view field. The laser communication system comprises at least one active communication device and at least one passive communication device which are paired with each other, and the active communication device comprises a rotary table unit and a body arranged on the rotary table unit; the body is provided with a first main control unit, an optical signal generation unit, a divergence angle adjustment unit, an optical field regulation and control unit, a first optical receiving unit and a first acquisition processing unit; the passive communication device comprises a second optical receiving unit, a second collecting and processing unit and a second main control unit. According to the invention, the position, orientation and data leakage risks of two communication parties are reduced, and double-end full-duplex communication is realized at the same time.

A Light Detection and Ranging (LIDAR) system includes a light source configured to emit a plurality of light beams having respective divergence angles over respective fields of illumination, and a detector array comprising plurality of detector pixels having respective fields of detection and configured to output respective detection signals responsive to light incident thereon. The respective fields of detection of the detector pixels are greater than or equal to the respective divergence angles of the light beams. Related devices and methods are also discussed.

An optical module (200). The optical module (200) comprises a circuit board (300) and a light emission component (400). The light emission component (400) comprises a substrate (910), a laser chip (920), and an adapter board (980). The power supply connection and signal connection between the substrate (910) and the laser chip (920) are achieved by means of the adapter board (980), thereby avoiding the use of wire bonding to achieve the connection between the substrate (910) and the laser chip (920). The laser chip (920) comprises a first optical waveguide (9212), a second optical waveguide (9214), and a third optical waveguide (9213). The passive third optical waveguide (9213) is butt-joined to the second optical waveguide (9214) at an output end of the first optical waveguide (9212); and the transition connection between the first optical waveguide (9212) and the second optical waveguide (9214) is achieved by means of the third optical waveguide (9213), so as to reduce the end face reflection between the first optical waveguide (9212) and the second optical waveguide (9214). By controlling the thickness and width of a waveguide core layer (9226) in the second optical waveguide (9214), the effective refractive index difference between the waveguide core layer (9226) and a cladding layer of the second optical waveguide (9214) is made smaller than the effective refractive index difference between a waveguide core layer (9221) and a cladding layer of the first optical waveguide (9212), so as to optimize the spot shape and far-field divergence angle of the laser chip (920).

According to the capturing and tracking integrated space laser communication terminal and the inter-satellite laser communication method, a capturing mechanism and a tracking mechanism of the laser communication terminal adopt the same mechanism assembly, when capturing and link building are carried out in orbit, a large-stroke fast reflecting mirror is used for carrying out directional scanning, and after an opposite satellite laser communication terminal receives a light beam of the satellite laser communication terminal of the opposite party, the capturing and tracking are carried out; the laser communication terminals of the two parties immediately switch to fine tracking link establishment; and if the satellite position of the opposite side exceeds the scanning range of the satellite laser communication terminal of the local side, pre-pointing and angle unloading correction are carried out by using a satellite platform of the local side. The design that receiving communication light and transmitting communication light of receiving and transmitting optics of the laser communication terminal share one optical assembly is simple and reliable, a large divergence angle is adopted, a large scanning area is achieved, the capturing time is shortened, and the capturing probability is improved. According to the invention, a capturing and tracking integrated design scheme is adopted, so that the system complexity, weight, size and power consumption of the laser communication terminal are reduced.

An optical device can include an end-fire optical phased array including an optical splitter to split an optical signal into a plurality of channels, an optical phase controller to control a phase of the optical signal transmitted from the optical splitter, and an end-fire optical radiator to radiate the optical signal transmitted from the optical phase controller. A lens can be further positioned on a path of the radiated optical signal to control a vertical divergence angle of the radiated optical signal.

The invention provides an alignment light path adjusting device, system and method, and relates to the technical field of photoetching. The alignment light path adjusting device comprises a base and a light beam quality analyzer, the light beam quality analyzer is connected to the base and can move relative to the base in the Z direction, the base is used for being connected with a shell of an optical module, and a display screen of the light beam quality analyzer corresponds to an emergent hole of the optical module and is used for receiving emergent light emitted through the emergent hole. The alignment light path adjusting device is simple in structure, low in cost, convenient to operate and high in adjusting accuracy, can effectively ensure that the collimation degree of incident light of the light inlet optical fiber in the optical module meets the requirement, reduces light spot change interference of divergence angle light beams, correspondingly improves the alignment accuracy of the optical module and an alignment system, and improves the product quality. And thus, the photoetching product yield of the photoetching machine is improved.

The invention discloses a three-dimensional asymmetric photonic crystal laser and a preparation method thereof. An epitaxial structure of the three-dimensional asymmetric photonic crystal laser comprises an N-type electrode, an N-type InP substrate, an N-type Al < x > < 1 > In < 1-x > < 1 > As upper limiting layer, a quantum well active region, a P-type Al < y > < 1 > In < 1-y > < 1 > As electron barrier layer, a P-type Ga < z > < 1 > In < 1-z > < 1 > Asz < 2 > P < 1-z > 2 functional layer, a P-type Al < x > < 2 > In < 1-x > < 2 > As lower limiting layer, a P-type InP connecting layer, a bottom insulating layer and a P-type electrode, wherein a three-dimensional asymmetric photonic crystal is etched on the P-type GaInAsP functional layer, and a chiral characteristic is introduced by destroying the symmetry of the photonic crystal, so that the P-type GaInAsP functional layer vertically emits a single-mode light beam with left-handed or right-handed circular polarization. By designing an asymmetric photonic crystal structure, efficient output of circularly polarized light beams is achieved, polarization selectivity and light beam quality are remarkably improved, and the advantages of low divergence angle and high light beam stability are achieved.

The utility model discloses a laser three-dimensional contour camera capable of suppressing stray light, which comprises a shell, a laser light source, an image acquisition element and an optical lens, the shell is provided with an internal accommodating space, and the laser light source, the image acquisition element and the optical lens are all arranged in the internal accommodating space of the shell. The laser light source is fixed on the shell through a mounting bracket, an opening is formed in one end, opposite to the laser light source, of the shell, the laser three-dimensional contour camera capable of inhibiting stray light further comprises a collimating lens module, the collimating lens module comprises a shell and a collimating lens arranged in the shell, and the collimating lens is arranged in the shell. The shell and the mounting bracket are integrally arranged or fixed at the periphery of the opening of the shell, and the divergence angle of the laser light source is changed through the collimating lens, so that laser emitted from the collimating lens module is irradiated on a measured object in a parallel and vertical manner, and light reflection of an irregular surface of the measured object can be reduced.

The invention discloses a supersonic speed laser spraying device and method, relates to the technical field of laser spraying, and realizes laser transmission and supersonic speed powder flow collaboration through cooperation of optical elements such as an output optical fiber, a collimating lens group and a convergent lens and a Laval nozzle structure. The method comprises the steps that multi-parameter closed-loop regulation and control are conducted, parameters such as the molten pool temperature and the powder flow divergence angle are monitored synchronously, and a process health index is constructed to trigger laser power, airflow pressure and powder feeding amount dynamic compensation; self-adaptive focus scanning is carried out, the focus position is adjusted in real time through a laser displacement sensor, and working modes are switched in linkage with a process health index; and lens abnormity diagnosis is carried out, a health index is constructed by using dual-wavelength transmissivity and wavefront distortion, and grading early warning and linkage powder feeding amount adjustment are carried out. According to the scheme, coating defects can be reduced, and the spraying precision and the system stability are improved.

A full-reception light path of a small-aperture single-atom filter of a resonance fluorescence laser radar and a detection method, applied to the technical field of laser radars. The full-reception light path comprises: a front light path assembly (100) used for collimating and converging a light beam and decomposing the light beam into a first light beam and a second light beam, wherein the polarization directions of the first light beam and the second light beam are perpendicular to each other, the divergence angle of the collimated light beam is smaller than a first preset angle, the divergence angle of the converged light beam is smaller than a second preset angle, and the first preset angle is smaller than the second preset angle; a polarized light path assembly (200), comprising a first light path assembly (210) and a second light path assembly (220), which are respectively used for transmitting the first light beam and the second light beam to a rear light path assembly (300) so as to filter out noise light in the first light beam; and the rear light path assembly (300) used for simultaneously detecting the first light beam and the second light beam after the noise light has been filtered out.

The invention discloses a laser beam divergence angle measuring method based on image fusion, and belongs to the field of photoelectric testing. A supersaturated light spot image and an unsaturated light spot image are fused to obtain an ideal fused image, the beam width of a light beam is obtained in a mode of calculating the second moment of the light spot, and then the divergence angle of the laser beam is obtained; according to the method, background noise of CCD camera imaging is removed by imaging the imaging plane in the shielding state for multiple times, and salt and pepper noise is removed by means of median filtering, so that the measurement precision is improved.

The invention discloses a real-time positioning method for a weld track, and belongs to the technical field of laser positioning, and the method comprises the steps: obtaining an environment state coefficient based on the environment light intensity and the temperature of a structured light emitter; a welding state coefficient is obtained based on the welding smoke particle concentration and the arc light intensity; acquiring an environment stability coefficient based on the welding state coefficient and the environment state coefficient under the vibration amplitude of the current structured light emitter; obtaining a structured light stability coefficient based on the laser wavelength, the line width and the power of the structured light emitter; obtaining a distance-reflection matching degree based on the laser working distance and the workpiece surface reflectance under the environment stability coefficient and the structured light stability coefficient; constructing a divergence angle optimization model based on the distance-reflection matching degree and the current laser divergence angle to output a target laser divergence angle; according to the method, high-precision real-time positioning of the welding seam track under the strong interference environment is achieved through multi-model cooperation, and the robustness and adaptability of a welding automation system are remarkably improved.