124 results about "Telecentric lens" patented technology

The invention relates to the technical field of ultrasonic scanning microscopes, in particular to a system and a method for measuring surface unevenness and warping of an ultrasonic scanning microscope. The system comprises a water tank, a light emitting device, a light receiving device and a signal processing module, the light emitting device generates line laser through a semiconductor laser and an optical shaping module, and scanning is achieved through a high-precision galvanometer. The light receiving device is provided with a narrow-band filter, a telecentric lens and a CMOS sensor and is used for capturing a light spot image; the signal processing module integrates sub-pixel positioning, galvanometer nonlinear correction, self-adaptive filtering and temperature compensation algorithms, light spot center sub-pixel-level positioning is achieved through Gaussian curved surface fitting, galvanometer correction and temperature drift compensation are combined, the measurement precision and stability are improved, and finally high-precision height information is fed back to an ultrasonic scanning system. According to the invention, the accuracy and reliability of surface unevenness and warping measurement are improved.

This invention discloses a coaxial telecentric polarization hyperspectral imaging device and a biological tissue detection system. The device includes: a light source emitting unpolarized light; a circular polarization generator converting the unpolarized light emitted by the light source into circularly polarized light; the circularly polarized light being coupled into a coaxial telecentric lens via a coaxial optical interface; the coaxial telecentric lens reflecting the circularly polarized light, which then illuminates the target object plane; the signal reflected from the target object re-enters the coaxial telecentric lens and is transmitted to a polarization analyzer module via a beam splitter. The polarization analyzer module includes a first waveplate and a first linear polarizer. The first waveplate receives the signal transmitted from the beam splitter and transmits the signal to the first linear polarizer. The first linear polarizer sends the output light to a hyperspectral camera, and the hyperspectral camera sends the output image to a computer for image analysis.

The utility model discloses a visual PIN needle detection equipment, including test board, the fixture seat of setting on test board and the CCD subassembly of setting on the fixture seat top, the CCD subassembly includes the coaxial light source, telecentric lens and CCD camera who sets gradually in vertical direction away from fixture seat, and CCD camera, telecentric lens and coaxial light source are on the same axis, and the light shield of setting the back and two side masks of test board is provided with on test board, and the connecting interface is provided with on test board, and the fixture seat includes the base and the positioning fixture of detachable setting on the base, and the positioning fixture is used for positioning installation detected component, and the support plate for supporting base is provided with on test board, and the sensor is provided with on the both sides of positioning fixture of support plate. The utility model discloses reasonable in structure design, and through the visual configuration of CCD camera + telecentric lens + coaxial light source, can realize to PIN needle and carry out detection, and thoroughly solved the problem that PIN needle is easy to wear in other detection mode among existing.

The invention provides a coaxial telecentric imaging tinplate can defect identification method and system, and relates to the technical field of defect identification, the system is composed of a coaxial telecentric camera assembly, a polarization multispectral light source assembly and an image processing and control unit, and can body images with constant magnification are obtained through a telecentric lens and coaxial illumination; a switchable cross-polarization visible light and near-infrared light source is used for synchronously collecting multi-modal images, and separation and difference are carried out on different polarization and wave band images to obtain a specular reflection component image, a diffuse reflection component image and a multi-spectral difference image. The image is divided into a character area, a pattern area and a bottom color area according to the format of the can body, comprehensive judgment is conducted through character comparison, a lightweight neural network and defect area connectivity analysis, automatic recognition of defects such as scratches, through printing and smudginess is achieved, and the accuracy and stability of appearance detection of the tin can on a high-speed production line can be improved.

Embodiments of the present application provide a high-magnification coaxial telecentric lens and a camera module. The high-magnification coaxial telecentric lens comprises, in order from the object side to the image side, a first lens group, a light splitting prism, a diaphragm, a second lens group and a third lens group. The first lens group comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens. The second lens group comprises a sixth lens and a seventh lens. The third lens group comprises an eighth lens and a ninth lens. The light splitting prism is provided with a coaxial light source on one side. The first lens, the third lens, the fifth lens, the sixth lens and the ninth lens all have positive refractive powers. The second lens, the fourth lens, the seventh lens and the eighth lens all have negative refractive powers. The first lens group comprises a first cemented lens. The focal length f J01 of the first cemented lens and the focal length f1 of the first lens group satisfy the relationship: 45 < f J01 / f1 < 55. The high-magnification coaxial telecentric lens achieves the purposes of high magnification, large numerical aperture and high imaging quality.

The application belongs to the technical field of spectral detection, and particularly relates to a light-weight LIBS online detection device and method with automatic focusing, wherein the device sequentially comprises a photoelectric switch, a pre-detection system, a controller, a delay timer, a pulse laser, a mirror, a zoom unit, an ellipsoidal mirror, a displacement adjustment platform, a transmission window sheet, a fiber coupling unit, a spectrometer and a signal strength detector according to a control logic and an optical propagation path. The application can easily realize zooming through the synchronous movement of the ellipsoidal mirror and the fiber coupling unit driven by the zoom lens and the displacement adjustment platform, can adapt to objects with different heights and shapes, solves the problem of large movement load in the zooming process, realizes light weight, and can judge the focusing range in advance through the telecentric lens imaging pre-detection system, so that the detection analysis efficiency is improved.

The invention discloses a double telecentric lens, an optical system and semiconductor equipment, and belongs to the technical field of optical equipment. The double telecentric lens provided by the invention comprises a first lens group, a second lens group, a third lens group and a fourth lens group which are sequentially arranged along an optical axis direction. The first lens group is sequentially composed of a first prism, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens. And the second lens group consists of a seventh lens, an eighth lens, a ninth prism and a tenth lens in sequence. And the third lens group consists of an eleventh lens, a twelfth prism and a thirteenth lens in sequence. And the fourth lens group consists of a fourteenth lens and a fifteenth parallel plate in sequence. In the scheme, the double telecentric lens adopts an optical architecture in which the front lens group and the rear lens group cooperate, and the front lens group serves as a short-focus convergence unit to primarily converge object light and correct basic chromatic aberration; and the rear lens group is used as a long-focus imaging unit to balance aberration and realize high magnification and a flat image surface.

The present application relates to a kind of pixel depth of field determination method and determining unit, three-dimensional reconstruction method and system, electronic equipment, computer readable storage medium, the determination method includes the steps: after the transmission of stripe image by telecentric lens, half-transmission half-reflection mirror is projected to the surface of measured object, by the reflection of telecentric zoom lens, half-transmission half-reflection mirror is respectively measured object reflected projection image is collected under two different focal distances;Afterwards, according to several real images under each focal length, the corresponding measured modulation is calculated respectively, two measured modulation is subtracted to obtain measured differential modulation, measured differential modulation is in the corresponding depth of field-differential modulation relationship corresponding depth of field as the actual depth of field of to-be-determined pixel, wherein, depth of field-differential modulation relationship is obtained by calibration step.Using the method of the present application can obtain more accurate depth of field, improve the effect of three-dimensional reconstruction.

The utility model relates to a double telecentric lens for industrial detection, which comprises a lens cone, a lens, a lens box, prisms and cameras, the lens cone comprises an inner lens cone, an outer lens cone and a lens cone sealing ring, the lens is arranged in the lens cone, one end of the lens cone is provided with the lens box, two ends of the lens box are respectively provided with the lens cone, two ends of the lens box are respectively provided with the cameras, and the prisms are arranged in the lens box. The inner lens cone is installed inside the outer lens cone, the outer side of the inner lens cone is provided with a plurality of diversion trenches, the inner side of the outer lens cone is provided with a plurality of clamping blocks, and the clamping blocks are installed on the diversion trenches. The lens box and the prism adopted by the utility model can shoot and detect at the same time under two-end visual angles, and the length of the utility model is reduced.

The invention is applicable to the field of detection, and discloses an image acquisition system and a calibration method applied to a transparent tubular workpiece, the image acquisition system comprises an imaging unit, a trigger and motion control unit and an illumination unit, the trigger and motion control unit comprises a driving device and a controller, the driving device is used for bearing and driving a tested transparent tubular workpiece to do horizontal linear motion and rotary motion, the imaging unit comprises a double-telecentric lens, a zooming assembly, an image sensing and collecting element and a semi-reflecting and semi-transmitting lens, the driving device and the zooming assembly are respectively connected with the controller, and the lighting unit comprises a telecentric light source. The telecentric light source is arranged right below the double telecentric lens and located below the transparent tubular workpiece to be detected, and the definition of image acquisition can be improved through cooperation of the telecentric light source and the double telecentric lens.

The invention discloses a projection lens image quality detection and automatic installation and adjustment device and method based on dual optical path feedback, and the device comprises an exposure projection lens module, a portal frame table, a motion control platform and a microscopic measurement module, the microscopic measurement module divides a light beam into two paths through a spectroscope: one path passes through a double telecentric lens to a first camera module to collect a space image, and the other path passes through a Fourier lens to a second camera module to collect a frequency spectrum image, so that synchronous acquisition of space and frequency domain information is realized; a DMD chip of the exposure projection lens module is provided with a leveling mechanism composed of four piezoelectric ceramic actuators, the inclination of the four corners of the DMD chip can be independently adjusted, an image processing system analyzes double-path data and calculates focal plane deviation, and a motion control system drives the actuators or a lens included angle adjusting motor to conduct closed-loop feedback control. And the image quality parameter reaches the standard. According to the invention, full automation of image quality detection and adjustment is realized, and the calibration efficiency and precision of the lens of the LDI equipment are greatly improved.

A visual inspection system includes a processor, a rotation stage, an adaptor, a light source, a telecentric lens and an image sensor. The adaptor is connected to the rotation stage and located under the rotation stage for positioning the lyophilized bead. The light source is located at a lateral side of the lyophilized bead for emitting lights to illuminate the lyophilized bead. The telecentric lens is located at the lateral side of the lyophilized bead for imaging the lyophilized bead. The image sensor is located at a lateral side of the telecentric lens opposite to the lyophilized bead for capturing images of the lyophilized bead. The rotation stage drives the lyophilized bead to rotate 360 degrees as performing an inspection of the lyophilized bead, and the image sensor continuously captures images of the lyophilized bead at different angles, thereby obtaining a three-dimensional image of the lyophilized bead for the inspection.

In order to solve the technical problems that the existing droplet observation device cannot monitor the multi-nozzle printing process and the overall observation precision is low, the present application provides a multi-nozzle single droplet real-time observation device, an observation method and a 3D printing system.The observation device of the present application can make the observation camera capture the current working printing nozzle and automatically focus on it in real time through the cooperation of the first steering engine and the displacement platform, and complete the real-time monitoring of the printing state of the printing nozzle; through the high-frequency multiple flashing of the LED flash, the observation camera can capture the images of the same droplet at multiple times in one shot, at the same time, the high-frequency deflection of the piezoelectric deflection mirror and the telecentric lens are matched with each other, the overlapping images of the single droplet at adjacent moments are separated, so that a single photo can have enough droplet images to show the forming process, the overall observation precision is improved, the quality monitoring and fault diagnosis problems during additive manufacturing are improved, and the waste rate of electronic 3D printing is reduced.

The utility model relates to the technical field of marking machines, in particular to a visual positioning laser marking machine which comprises a base, the base is located at the bottom end of the whole device, a supporting frame is fixedly installed at the upper end of the base, a laser head is installed in the supporting frame, a CCD camera is arranged on one side of the laser head, a telecentric lens is installed at the bottom end of the CCD camera, and the telecentric lens is arranged on the other side of the CCD camera. The bottom end of the telecentric lens is provided with a pseudo coaxial assembly. According to the device, after the laser marking machine outputs laser through the laser head, the laser and the CCD camera are coupled and output through the reflection laser and the visible light reflection lens, after the CCD camera takes a picture, image information is converted into coordinate information through a professional software algorithm, and the coordinate information is sent to the laser scanning head, so that visual positioning and marking actions are realized; compared with the true coaxial assembly, the pseudo coaxial assembly has the advantages of being convenient to install, large in view field and low in cost, and the pseudo coaxial assembly is high in stability and can stably work in various industrial environments.

A method for precisely measuring the size of a rotary body component based on telecentric imaging belongs to the technical field of precise measurement and instruments, and comprises the following steps: constructing a measurement system by using an area array scanning camera (5), a telecentric lens (4) and a backlight source (1), adjusting the measurement position through a displacement table (6), projecting the axial section of the rotary body component (3) to be measured onto an image sensor, and measuring the size of the rotary body component (3); obtaining a projection image; utilizing image processing algorithms such as sub-pixel edge extraction, contour fitting and a least square method to accurately extract edge data of the rotary body component (3); a standard ball and a pin gauge are introduced as calibration objects, the amplification factor and edge positioning errors are corrected, a mathematical model is used for error compensation, and the actual size of the rotary body component (3) is obtained; the system is simple in structure, convenient to calibrate, high in measurement efficiency and suitable for application occasions with high measurement requirements on the size precision of the rotary body component, such as aerospace and precision manufacturing.

The application provides a mark positioning method and system based on an object-side telecentric lens, wherein the method comprises the following steps: determining the mechanical pixel x-axis magnification, the mechanical pixel y-axis magnification, the x-axis telecentricity and the y-axis telecentricity corresponding to the image acquisition device based on the object-side telecentric lens; determining the target conversion matrix from the pixel coordinate system to the mechanical coordinate system according to the mechanical pixel x-axis magnification, the mechanical pixel y-axis magnification, the device center point mechanical x-axis coordinate, the y-axis coordinate and the z-axis coordinate, the image acquisition device focal length, the x-axis telecentricity and the y-axis telecentricity; acquiring and determining the mask worktable moving path according to the position of the reference mark plate mark, the position of the mask mark and the target conversion matrix from the pixel coordinate system to the mechanical coordinate system; and controlling the mask worktable to move. The application can realize the three-dimensional space accurate positioning of the target object with higher precision through the effective fusion of the telecentricity and the mechanical pixel magnification and other parameters for mark positioning.

The utility model relates to the technical field of optical lenses, and discloses a high-magnification achromatic telecentric lens and an optical system thereof. The optical system comprises a first lens G1 with positive focal power, a second lens G2 with negative focal power, a third lens G3 with positive focal power, a fourth lens G4 with negative focal power, a fifth lens G5 with positive focal power, a sixth lens G6 with negative focal power, a seventh lens G7 with positive focal power and a diaphragm T which are sequentially arranged from an object side to an image side, the system comprises a first lens G8 with negative focal power, an eighth lens G8 with negative focal power, a ninth lens G9 with negative focal power, a tenth lens G10 with positive focal power and an eleventh lens G11 with positive focal power. According to the optical system of the double telecentric structure provided by the utility model, the amplification factor can reach more than four times, the numerical aperture NA can reach 0.16, and the resolution of the microscopic level of 2 microns can be realized; and the maximum imaging surface can reach phi 44 mm.

The invention discloses a visual positioning method and system based on ROI dynamic alignment, and relates to the technical field of machine vision. The method comprises the following steps: moving a camera to a mark point estimation position; calculating the offset between the mark point and the view center; if the offset is too large, the camera is driven to move to search points according to a specific path (such as a concentric-square-shaped path) in a preset local area; after the mark point is found, the mark point is moved to the view center through mechanical compensation; and finally, high-precision identification is carried out in a central low-distortion area. According to the method, the ROI is dynamically adjusted, so that the mark point is always identified in the optimal imaging area, the edge effect caused by lens edge distortion is fundamentally eliminated, high-precision, high-efficiency and low-cost visual positioning is realized under the condition that a telecentric lens or a complex distortion model is not needed, and the method is suitable for large-scale popularization and application. The method is especially suitable for the alignment process in the high-end precision manufacturing field of semiconductors, display panels and the like.

The invention belongs to the technical field of optical lens imaging, and particularly relates to a double-channel double-telecentric lens and an optical system for detecting defects on the inner surface and the outer surface of a transparent tube. The dual-channel dual-telecentric lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a beam splitter prism, a seventh lens, an eighth lens, a ninth lens and a tenth lens which are sequentially arranged from an object space to an image space along an optical axis, wherein the first lens, the third lens, the seventh lens, the eighth lens and the ninth lens adopt meniscus lenses, the refraction of light can be effectively controlled, the effects of aberration correction and imaging quality optimization are achieved, the symmetry of the optical system can be improved, the spherical aberration and the coma aberration can be reduced, and therefore the compactness of the optical system is optimized. The one-to-two dual-channel structure has the characteristics of high resolution, high efficiency, large field of view, low cost, small size and the like, and synchronous clear imaging of the inner surface and the outer surface of the transparent tube is completed in a dark field environment.

The utility model relates to the technical field of workpiece detection, in particular to a workpiece detection device which comprises a rack and a detection assembly, a workbench is fixedly arranged on the rack, the detection assembly is movably arranged on the workbench, the workpiece detection device further comprises a moving assembly, the moving assembly comprises a sliding seat, a positioning frame and a backlight plate, the sliding seat is movably arranged on the workbench, and the backlight plate is arranged on the positioning frame. The positioning frame and the backlight plate are fixedly arranged on the sliding seat, a groove and an opening which are communicated are formed in the positioning frame, the groove is located above the opening, the size of the groove is larger than that of the opening, the detection assembly is located above the groove, and the backlight plate is located below the opening. According to the workpiece detection device provided by the utility model, the detection camera and the telecentric lens are used for shooting, and meanwhile, the backlight plate acts, so that the detection camera and the telecentric lens can clearly and accurately shoot details of a workpiece, and the detection accuracy is high; the workpiece is loaded and unloaded by people through the sliding seat and the positioning frame more conveniently, the loading and unloading speed is increased, and the detection efficiency of the workpiece is further improved.

The invention relates to a device and a method for measuring the center distance of a thrust rod, and belongs to the field of vehicle part detection. According to the technical scheme, the thrust rod center distance measuring equipment comprises a box body, a main body platform is arranged in the box body, a jig is arranged on the main body platform, a camera adjusting module is arranged on one side of the jig, two industrial cameras are installed on the camera adjusting module, telecentric lenses are installed on the industrial cameras, and a light source adjusting module is arranged on the other side of the jig. Two parallel light sources are mounted on the light source adjusting module; the system further comprises a control terminal which is electrically connected with the industrial camera and used for receiving images shot by the industrial camera and processing and analyzing the images. The industrial camera is matched with the parallel light source, so that non-contact visual detection on the two ends of the thrust rod is realized; the control terminal automatically processes image data, the detection efficiency is greatly improved, meanwhile, personal errors are reduced, the consistency and accuracy of measurement results are guaranteed, and the problems that traditional three-coordinate detection is low in efficiency and high in cost are solved.

The application relates to the technical field of machine vision lenses, and discloses a 2.5-micron-pixel camera and a high-resolution low-distortion double-telecentric lens and an optical system thereof. The optical system comprises, arranged in sequence from an object side to an image side, a first lens G1 with positive refractive power, a second lens G2 with positive refractive power, a third lens with positive refractive power, a fourth lens G4 with negative refractive power, a fifth lens G5 with negative refractive power, a sixth lens G6 with positive refractive power, a seventh lens G7 with positive refractive power, an eighth lens G8 with positive refractive power and a ninth lens G9 with negative refractive power, and the optical axes of all the lenses coincide with a predetermined optical axis. The application realizes a high-resolution low-distortion double-telecentric lens, the full-field distortion of which is less than 0.02%, and the resolution of which can reach 200 lp / mm, so that the measurement precision can be effectively improved.

The utility model relates to the technical field of machine vision lenses, and discloses a large-view full-frame telecentric lens and an optical system thereof. The optical system is sequentially provided with a first lens G1 with positive focal power, a second lens G2 with positive focal power, a third lens G3 with positive focal power, a fourth lens G4 with negative focal power, a diaphragm S, a fifth lens G5 with negative focal power and a sixth lens G6 with positive focal power from an object side to an image side, and is characterized in that the first lens G1 with positive focal power, the second lens G2 with positive focal power, the third lens G3 with positive focal power, the fourth lens G4 with negative focal power, the diaphragm S, the fifth lens G5 with negative focal power and the sixth lens G6 with positive focal power are sequentially arranged from the object side to the image side; the seventh lens G7 has positive focal power; and the eighth lens G8 has positive focal power. According to the optical system of the double telecentric structure provided by the utility model, the resolution is 145lp / mm, the visual field can reach phi 300mm, and the MTF value gt of the full visual field is realized; the first lens and the second lens are integrated, the distortion is smaller than 0.02%, a full-frame camera is supported, the outer diameter size of the lens behind the first lens is greatly reduced, and the production and manufacturing cost is effectively reduced.

The invention provides a large-view-field compact image space telecentric lens and an imaging method, and relates to the technical field of optical imaging lenses, the lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens and an aperture diaphragm, the lens is formed by nine spherical glass lenses, and the aperture diaphragm is formed by nine spherical glass lenses. The structure is reduced, the cost is reduced, the total optical length of the lens is controlled within 50mm under the conditions of a large field angle and a long working distance, the compact structural design of the lens is realized, the integration level of the lens is effectively improved, the telecentric degree of the image space of the lens is superior to 0.02 degree, the maximum optical distortion is strictly controlled to be not greater than 0.14%, and the lens has a wide application prospect. According to the invention, a reliable guarantee is provided for high-precision size measurement, measurement errors caused by parallax are effectively eliminated, the geometric fidelity of imaging is ensured, and the technical problems of high cost, complex lens structure and long total length of the existing lens are solved.

The present application relates to the field of light-cured additive manufacturing, and more particularly to a light-cured additive manufacturing method and device based on a double-telecentric lens, comprising the following steps: S1: completing optical design of a double-telecentric system front lens group I, a double-telecentric system front lens group II and a double-telecentric system rear lens group based on double-telecentric system optical indicators; S2: a projection light beam emitted by a DLP optical module passes through the double-telecentric system front lens group I and a light splitting prism in sequence and is incident into the double-telecentric system rear lens group, and is projected to a photosensitive resin pool through the double-telecentric system rear lens group, so that the photosensitive resin in the photosensitive resin pool is cured and formed on a displacement table, and the displacement table moves along a vertical Z-axis to layer-by-layer build a three-dimensional micro-nano structure; the method further comprises the following step: S3: a light-cured forming pattern is projected to an industrial camera through a feedback light path; the method can effectively solve the shortcomings of low forming precision, poor forming quality and slow forming speed in existing light-cured technology.

The application provides a telecentric lens and a mechanical vision detection device. The telecentric lens comprises a first lens module, the optical power of the first lens module is positive; a second lens module, the second lens module comprises a light source, a beam splitter and a first lens group and a second lens group for reducing chromatic aberration of the telecentric lens, the light source is arranged on the beam splitter, the beam splitter is used for reflecting light emitted by the light source to illuminate a measured object and transmitting light emitted by the first lens group to the second lens group; the optical power of the second lens module is negative; a third lens module, the optical power of the third lens module is positive; the first lens module, the first lens group, the beam splitter, the second lens group and the third lens module are sequentially arranged along the light propagation direction. The telecentric lens and the mechanical vision detection device provided by the application reduce the interference of stray light on imaging and improve the imaging quality.

1. The name of the design product: one-key measurement sensor. 2. The use of the design product: the design product is applied to non-contact workpiece size measurement. Through a complete set of optical imaging system devices such as telecentric lens, camera and light source, the size of the measured object is measured with high precision without contacting the measured object. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view 1.

Various examples relate to collimated phase measuring deflectometry. In one example, is a collimated phase measuring deflectometer system with a screen that emits a structured light pattern; a collimation optical system comprising a Fourier lens positioned such that the structured light pattern passes through the collimation optical system; a beam splitter positioned such that the structured light pattern is redirected to illuminate a surface of a specimen under test (SUT); and a camera having a telecentric lens positioned such that a deflected pattern produced by illuminating the surface of the SUT is captured by the camera. The deflection pattern is insensitive to the distance from the collimated phase measuring deflectometer to the SUT surface. In another example, a method includes emitting a structured light pattern; collimating the emitted light pattern; reflecting collimated light to illuminate a SUT surface; and acquiring an image of a deflected pattern produced by the illumination.

The application is suitable for the field of detection, and discloses an image acquisition system applied to a transparent tubular workpiece and a calibration method. The image acquisition system comprises an imaging unit, a triggering and motion control unit and an illumination unit. The triggering and motion control unit comprises a driving device and a controller. The driving device is used for carrying and driving the measured transparent tubular workpiece to move horizontally and rotate. The imaging unit comprises a double-telecentric lens, a zoom assembly, an image sensing acquisition element and a half-mirror. The driving device and the zoom assembly are connected with the controller respectively. The illumination unit comprises a telecentric light source. The telecentric light source is arranged directly below the double-telecentric lens and below the measured transparent tubular workpiece. Through cooperation of the telecentric light source and the double-telecentric lens, the definition of image acquisition can be improved.

This invention discloses a visual positioning method for laser cutting equipment, relating to the field of laser cutting visual positioning technology. The method includes the following steps: S1, Image Acquisition: Image information of the laser-cut workpiece is acquired through a visual acquisition module, which includes an external binocular industrial camera and a coaxial vision camera. The external binocular industrial camera is fixed to the crossbeam of the laser cutting machine tool and is used to acquire a large-format overall image of the workpiece. The coaxial vision camera is coaxially set with the laser cutting head via a beam splitter and is used to acquire a local precision image of the workpiece. This visual positioning method for laser cutting equipment, by using an external binocular industrial camera with a telecentric lens and a coaxial vision camera with a coaxial light source and polarizer, combined with distortion correction, sub-pixel edge detection, and other algorithms, effectively reduces errors caused by perspective distortion, high reflectivity interference, and lens distortion.