656 results about "Parallel beam" patented technology

The invention relates to the technical field of filter films, and discloses a filter film thickness detection device and a detection method. The method comprises the following steps: acquiring a first parallel beam, a second parallel beam and a third parallel beam; fixing a to-be-measured filter film sample on a sample table, and measuring the to-be-measured filter film sample to obtain a reflection spectrum and an initial refractive index parameter; irradiating the to-be-measured filter film sample by using the first parallel light beam, the second parallel light beam and the third parallel light beam, dividing the measurement area into a plurality of sub-areas according to the initial refractive index parameter, and fitting by using a least square method to obtain the optimal thickness value and refractive index value of each sub-area; based on the optimal thickness value, the refractive index value and the reflection spectrum, a mapping relation between the spectral reflectivity and the thickness is established, and a target thickness distribution diagram is obtained through iterative algorithm solving and error compensation calculation. According to the invention, the problem of uneven measurement of the thickness of the large-area filter film is solved, and the precision, efficiency and reliability of thickness detection of the filter film are remarkably improved.

The invention discloses a reflection-transmission mixed extreme ultraviolet collimation illumination system, and relates to the technical field of extreme ultraviolet optics. The system comprises a discharge plasma EUV light source, a multilayer film ellipsoid reflector and a collimating super lens. Wherein the discharge plasma EUV light source is used for generating radiation light in an extreme ultraviolet band; the multi-layer film ellipsoid reflector adopts an ellipsoid design, is plated with a high-reflectivity multi-layer film, is arranged on a transmission line of the discharge plasma EUV light source, and is used for focusing light beams of the light source; and the collimating super lens is arranged behind the focal position of the multi-layer film ellipsoid reflector and is used for collimating the focused light beams to form parallel light beams for Talbot photoetching illumination. The extreme ultraviolet illumination system is compact in structure, high in light beam energy and high in collimation, and the exposure quality in an application scene needing high-collimation extreme ultraviolet light beams is effectively improved.

The invention provides a laser beam splitting multi-galvanometer parallel scanning processing system, which comprises a laser, a beam splitter group, a plurality of groups of collimation beam expanders, a plurality of groups of attenuators and a plurality of focusing scanning galvanometer systems, and is characterized in that the beam splitter group comprises at least one total reflection mirror and at least one beam splitter, and the axial leads of all lenses in the beam splitter group are parallel to one another; the beam splitter group is used for equally dividing a laser beam output by the laser into a plurality of parallel light beams with the same power, a light path where each parallel light beam is located is sequentially connected with a group of collimation beam expanders, a group of attenuators and a focusing scanning galvanometer system, and each focusing scanning galvanometer system is used for focusing each parallel light beam to a to-be-processed plane. According to the invention, the effect of multi-beam and multi-galvanometer parallel scanning processing is realized through beam splitting of a single laser, the scanning breadth is effectively expanded, the manufacturing efficiency is improved, the input power of each light path is independently controllable, and the equipment cost is greatly reduced.

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 disclosure relates to augmented reality devices based on a curved waveguide. An augmented reality device is provided. The augmented reality device includes a projection system to project an undistorted image, an input optical compensator located on the path of light rays out-coupled from the projection system, a curved waveguide comprising an input diffractive optical element and an output diffractive optical element. The output diffractive optical element performs the function of an output optical compensator that converts the light beams of a distorted image at the output of the waveguide into parallel light beams to output an undistorted image. Augmented reality glasses comprising an augmented reality device are also proposed. There is provided the ability to project a virtual image without aberrations, distortions and doubling of the image.

The invention discloses a frequency response testing device and method for a high-frequency working deformable mirror, and relates to the technical field of adaptive optics, and the device comprises a pulse signal generator which generates a pulse signal of a first frequency and a pulse signal of a second frequency, the first frequency is equal to the working frequency of the deformable mirror, and the second frequency is equal to the working frequency of the deformable mirror; the second frequency is equal to the sampling frequency of the Shack-Hartmann wavefront sensor, the laser generating part emits parallel light beams to the deformable mirror, the action driver works based on a pulse signal of the first frequency and drives the deformable mirror, and the Shack-Hartmann wavefront sensor works based on a pulse signal of the second frequency and drives the deformable mirror to rotate. And collecting and imaging the reflected light beam of the deformable mirror to obtain a light spot array image, processing the light spot array image by the processor to obtain a reconstructed wavefront image, and continuously adjusting the working frequency of the deformable mirror to complete the frequency response test of the deformable mirror. The cost for testing the frequency response of the high-frequency working deformable mirror can be greatly reduced.

The present disclosure describes a turntable parallel scanning confocal microscope illumination light path, the illumination light path comprising a sleeve assembly having a light source and a field diaphragm, a lens barrel assembly having a collector lens, a beam splitting chamber having a turntable, a tube lens and a microscope objective, the light source being configured to form a first parallel beam entering the lens barrel assembly via the field diaphragm; the light source is imaged on the focal plane of the light collecting mirror; the turntable is configured to receive a second parallel light beam emitted from the tube lens, the second parallel light beam is configured to form a preset image on the turntable, the turntable is configured to receive a first parallel light beam emitted into the light splitting chamber through the lens barrel assembly, and the first parallel light beam is configured to form a light spot covering a small hole surface of the turntable on the turntable; the microscope objective is configured to be installed at the position of an image of the light source which is formed by the light beam emitted from the tube mirror and meets the preset requirement. According to the invention, the illumination light path of the turntable parallel scanning confocal microscope, which is simple and convenient to operate and can be conveniently and accurately assembled and adjusted, can be provided.

The invention relates to the technical field of semiconductor detection, in particular to a wafer bright field illumination and imaging system, a wafer defect detection device and a wafer defect detection method, the system comprises an illumination module, a beam combining module, an objective lens module and an acquisition imaging module; wherein the illumination module generates an illumination light beam adaptive to a wafer detection view field; the beam combining module realizes non-interference separated transmission of an illumination light path and an acquisition light path through a reflection area and a transmission area which work independently; the objective lens module converges the light beams reflected by the reflection area to the surface of the wafer, and controls the light beams to form illumination only at the edge of an entrance pupil so as to realize off-axis illumination; meanwhile, the reflected light beams on the surface of the wafer are collimated and then transmitted to the transmission area; and the acquisition imaging module receives the parallel light beams, converts optical signals into electric signals, and generates a wafer surface image. According to the invention, the problems of high energy loss, high cost, low detection rate and insufficient resolution of a traditional bright field detection system are effectively solved.

According to the large-size wafer morphology measuring device provided by the invention, the parallel light beams emitted by the light source are split to form the reference light and the test light, the reference light enters the beam combiner after being reflected by the reference reflector, and the test light enters the beam combiner after being reflected by the surface of one side of the measured wafer; the beam combiner combines the incident reference light and test light and then converges the light to the detector to generate an interference fringe image, and the control unit controls the movement of the tested wafer and / or the reference reflector to change the optical path difference between the tested wafer and the reference reflector so as to determine the surface topography of the wafer. And the test yield and precision of the large warping sheet are improved.

The invention discloses a displacement sensor, a galvanometer motor system, an assembling method and a signal processing method, the displacement sensor is connected with a motor shaft and adopts a transmission-type grating sandwich structure, and the transmission-type grating sandwich structure comprises a light source module which is arranged on the upper layer and comprises an aspheric collimating lens capable of generating uniform parallel light beams; the grating code disc is arranged on the middle layer and made of an optical glass substrate, and the grating code disc is fixed on the motor shaft through a code disc tray; the photoelectric receiving module is arranged on the lower layer, the photoelectric receiving module comprises a plurality of groups of orthogonally arranged photodiodes and photoelectric converters, the photodiodes are used for receiving light and shade changes of light stripes and forming optical signals, and the photoelectric converters are used for receiving the optical signals and converting the optical signals into electric signals. According to the invention, the size of the structure can be reduced, the position subdivision precision is improved, the signal processing speed and the anti-interference capability are improved, and thus the use effect of the galvanometer motor system is improved.

The utility model provides a skin processing and measuring all-in-one machine. The skin processing and measuring all-in-one machine is composed of a processing head, a measuring head, a vacuum adsorption mold tool and an all-in-one machine rack. The vacuum adsorption mold tool and the all-in-one machine rack are both fixedly arranged on the base. An all-in-one machine rack is arranged on each of the two sides of the vacuum adsorption mold tool; a sliding rail is arranged on each all-in-one machine rack, and the sliding rails of the two all-in-one machine racks are parallel to each other; the two parallel cross beams are erected above the vacuum adsorption mold tool through the all-in-one machine rack and can horizontally slide along sliding rails on the all-in-one machine rack. The processing head and the measuring head are respectively arranged on one cross beam through a multi-axis mounting frame, and the multi-axis mounting frame can horizontally slide along a slide rail on the cross beam and can drive the processing head or the measuring head to vertically move, deflect and horizontally rotate.

A laser beam expanding lighting device comprises an incident laser adjusting module, an adjustable base module and a beam expanding lens set module, a parallel light beam injection port and a plane mirror are installed in the incident laser adjusting module, and after collimation, a laser mirror is transmitted to a beam expanding lens set after being reflected by the two adjustable plane mirrors; the beam expanding lens group realizes the adjustment of the beam expanding angle and the beam expanding multiple by combining different beam expanding lenses and adjusting the distance between the beam expanding lenses; the beam expanding lens set is installed on the adjustable base, the adjustable base achieves deviation of the axis of the beam expanding lens set in two directions relative to the axis of laser through an ejector pin-spring linkage mechanism, the irradiation position of the laser on the beam expanding lens is changed, and adjustment of a laser illumination area is achieved while beam expanding is conducted. The parallel light beam injection port and the beam expanding lens group of the device can be arranged in a non-coaxial mode, the application range is wide, the overall structure is compact, operation is convenient, and various adjusting adaptability is achieved.

The invention relates to the technical field of light paths, and particularly discloses a laser shaping system and a laser printer, the laser shaping system comprises an LD collimating lens, a rotating mirror, a focusing lens and a focusing surface which are arranged in sequence; the LD collimating lens is used for receiving a first fast-axis laser beam and a first slow-axis laser beam, converting the first fast-axis laser beam into a fast-axis collimated beam, and converting the first slow-axis laser beam into a slow-axis collimated beam; wherein the fast axis collimated light beam and the slow axis laser light beam are parallel light beams; the rotating mirror is used for performing deflection processing on the fast-axis collimated light beam to obtain a second fast-axis laser beam, and performing deflection processing on the slow-axis laser beam to obtain a second slow-axis laser beam; and the focusing lens is used for focusing the second fast axis laser beam and the second slow axis laser beam to the focusing surface. The invention can bear high-power laser, and is low in light path cost and easy to process.

The invention provides a multi-chip packaged semiconductor laser, which comprises a tube shell, a plurality of equidistant step structures in the tube shell, a plurality of laser chips, a plurality of collimating lenses and a relay heat sink, and a plurality of diaphragms and tube shell pins on the side wall of the tube shell, wherein the equidistant step structures at the bottom of the tube shell are used for bearing and fixing the laser chips, the laser chips have the same light emitting direction, the collimating lens is fixed at the front end of the light emitting direction of the laser chips and is used for collimating the emergent laser of the laser chips, and the window sheets are fixed on the side wall of the tube shell and are in one-to-one correspondence with the laser chips. And the collimated laser is transmitted to the outside of the tube shell through the diaphragm to form a plurality of paths of parallel light beams with equal height or unequal height. According to the invention, slow-axis coupling lenses, reflectors and the like are reduced in the sealed shell, the coupling difficulty of optical elements of the sealed shell and the size of the shell are reduced, the cost is reduced, and the reliability of the product is improved.

The invention discloses a coating thickness detection system based on a terahertz synthetic aperture imaging technology. The coating thickness detection system comprises an emission source, a detector, a beam splitter, a focusing lens and a two-dimensional translation stage, terahertz waves emitted by the emission source penetrate through the beam splitter and then are focused to a focus by the focusing lens, and then continue to be propagated from the focus in the form of divergent waves and irradiate a measured sample; a part of terahertz waves scattered by the sample irradiate the focusing lens through the focus, are collected by the focusing lens, are converted into parallel beams, and are reflected by the beam splitter until being detected by the detector; and the two-dimensional translation stage is used for carrying out two-dimensional scanning on the measured sample, synchronously recording the terahertz signal detected by the detector, and then reconstructing a three-dimensional terahertz image of the sample. The invention further discloses a coating thickness detection method. According to the scheme, the coating thickness of the measured sample can be conveniently and efficiently measured.

The invention discloses a one-dimensional ultra-wide field-of-view ultra-high spectral resolution dispersion coherent imaging spectrometer, which belongs to the technical field of spectral imaging, and comprises a first microlens array used for obtaining incident light of a one-dimensional ultra-wide field-of-view in a horizontal plane; the plurality of optical fibers are used for transmitting incident light of a one-dimensional ultra-wide field of view; the second micro lens array is used for collimating incident light from each optical fiber into broadband parallel light beams; the grating beam splitter interferometer is used for dispersing the broadband parallel light beams into a plurality of narrow-band parallel light beams with different propagation directions; the cylindrical lens is used for converging the two paths of coherent light of each narrow-band parallel light beam to a target block of the detector, and converging the narrow-band parallel light beams with different propagation directions to different target blocks respectively; and the detector is used for obtaining a continuous broadband ultra-high resolution spectrum according to the two paths of coherent light received by each target block. According to the invention, a one-dimensional ultra-wide field of view is obtained in a horizontal plane, and ultra-high spectral resolution can be obtained.

The invention discloses a miniature light-emitting diode chip which comprises a light-emitting mesa, a passivation layer and a reflecting layer, the passivation layer is located between the light-emitting mesa and the reflecting layer and at least covers the side surface of the light-emitting mesa, the reflecting layer is arranged on the surface of the passivation layer, and at least one part of the surface, facing the passivation layer, of the reflecting layer is a curved surface. By adopting the reflecting layer with the curved surface, a point light source can be collimated into parallel light, so that total reflection is reduced. The collimated parallel light beams can transmit light more effectively, scattering and loss of the light are reduced, and then distribution and direction of the light are controlled flexibly.

The invention belongs to the technical field of laser, and particularly discloses a beam shaping system and method based on prism pair orthogonality and cascade, and the system comprises a single-mode fiber, an aspherical lens, a first prism pair, a first parallel plate, a second prism pair and a second parallel plate which are sequentially arranged along the direction of an optical axis. A Gaussian beam emitted by a single-mode optical fiber is collimated by an aspherical lens to form a parallel beam, the beam is expanded or compressed in the X direction by a first prism pair, the beam is expanded in the Y direction by a second prism pair, and two inclined parallel plates are respectively used for compensating the beam offset in the X / Y direction; according to the invention, the circular Gaussian beam emitted by the single-mode fiber can be shaped, a large strip-shaped collimation light spot with an adjustable length-width ratio from 4: 1 to 20: 1 and a long axis size of 30mm can be realized, and the central positions of the input and output beams in the cross section are ensured to be unchanged.

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 provides a multi-geometric-structure incident light path guiding device and X-ray diffraction equipment. The device comprises a reflector assembly and a movable slit assembly, the reflector assembly and the movable slit assembly are arranged on an irradiation path of an incident light beam, and a reflecting surface of the reflector assembly is arranged to reflect and adjust the received incident light beam into a focused or parallel light beam geometric structure and face the center of the goniometer; the reflector assembly is provided with a light beam channel. When the target light beam is geometrically a focused or parallel light beam, the movable slit assembly is configured to guide the incident light beam to the reflecting surface, and the reflected incident light beam reaches the center of the goniometer; when the target light beam is geometrically a divergent light beam, the movable slit assembly is configured to guide an incident light beam to pass through the light beam channel and reach the center of the goniometer. The device is simple in structure and flexible in switching, and an independent multi-stage nested translation or rotation compensation structure does not need to be additionally arranged.

The invention discloses an electrically-controlled variable optical attenuator based on a multistage wedge-shaped liquid crystal box and an attenuation control method, the attenuator comprises a laser, the laser provides an incident light signal, the divergent incident light signal is converted into a collimated parallel light beam through a collimator, the collimated parallel light beam is subjected to deflection modulation through a multistage wedge-shaped liquid crystal box module, and the modulated light beam is converted into a modulated light beam; the multi-channel liquid crystal controller is coupled to the output optical fiber through the optical fiber coupler, and generates and outputs driving voltage signals capable of being independently adjusted to the N-stage wedge-shaped liquid crystal box module, so that each wedge-shaped liquid crystal box in the multi-stage wedge-shaped liquid crystal box module is independently controlled; the control method comprises the steps of receiving a target instruction, querying a system-level relationship, distributing a deflection task, querying a device-level relationship, outputting a driving signal and performing closed-loop feedback correction. According to the invention, a large attenuation range is obtained, and at the same time, millisecond-level and even sub-millisecond-level rapid response is realized; the precision, the linearity and the usability of attenuation control are improved, and the control complexity is reduced.

The invention discloses a high-resolution scanning spectrometer based on a linear array detector and a use method, and belongs to the technical field of spectrum instruments and spectral analysis. The first aspherical mirror is used for reducing the diameter of a light beam emitted by the light source, and the second aspherical mirror is used for collimating effective wave band light passing through the slit into parallel light beams; the plane scribed grating is used for diffracting the light beam; the reflection system is used for reflecting the light beam to enable the light beam to enter the plane scribed grating again for secondary diffraction; the first spherical mirror is used for collimating light beams passing through the first aspherical mirror, the second spherical mirror is used for converging the light beams diffracted for the first time at the slit, and the third spherical mirror is used for converging the light beams diffracted for the second time into the linear array photoelectric detector. The advantages of a light splitting type spectrograph and a scanning type spectrograph are combined, a reflection type light path structure is adopted, extra aberration introduced by a transmission type light path is avoided, the data acquisition efficiency is improved, and high-quality imaging is guaranteed.

The invention, which belongs to the technical field of spectral imaging, discloses an ultra-wide-band ultra-wide-field-of-view high-spectral-resolution real-time imaging spectrometer comprising a first micro-lens array, a plurality of optical fibers, a plurality of second micro-lens arrays and a plurality of assemblies. First micro lenses in each column of the first micro lens array are arranged on a vertical plane arc, and micro lenses in each row are arranged on a horizontal plane straight line, so that incident light of a one-dimensional ultra-wide view field is obtained in real time; through optical fiber coupling, incident light is transmitted to the second micro lens array to be collimated into parallel light beams; according to the components, light of different wavebands is processed through the optical filter, the plane transmission grating and the detector, first-order diffraction light beams of different wavelengths in the different wavebands are received by the detector after diffraction, and space information and spectral information are obtained in real time according to an irradiated target block. The imaging spectrometer provided by the invention has the advantages of ultra-wide wave band, ultra-wide field of view, high spectral resolution, real-time measurement, compact structure and high stability, and is suitable for a remote sensing photoelectric reconnaissance detection system.

A THz measuring method and a THz device for measuring a container with a joint, in particular, a blow mold container with a pinch-off seam, where a THZ sensor is adjusted relative to a container region in multiple positions with different orientations of the optical axis, THz radiation is emitted as a non-parallel beam bundle from the THz sensor towards the container region, and THz radiation partially reflected on the interior surface and the exterior surface of the container area is received, and one or more of the characteristics of the joint are determined.

The invention discloses a multi-wavelength same-viewing-direction laser radar telescope system, and belongs to the technical field of laser radar detection. The system comprises a paraboloid single primary mirror which focuses a specific wavelength optical signal received by a telescope to a focus through a primary mirror paraboloid; the replaceable small hole is fixedly formed in the focus position of the paraboloid single primary mirror; the collimating lens group is used for collimating the telescope focusing light beam penetrating through the replaceable small hole to form parallel light beams; the n dichroic mirror groups are used for dividing the parallel light beams into reflected parallel light beams and transmitted parallel light beams; and the plurality of focusing lens group assemblies are used for focusing the parallel light beams split by the dichroic mirror to the focal points of the focusing lens group assemblies, and the number of the plurality of focusing lens group assemblies is n + 1. Multi-wavelength receiving in the same direction can be achieved, light background noise is suppressed by the secondary diaphragm, view fields of different wavelengths are controlled respectively, the size is small, the light collecting efficiency is high, and noise is low.

The invention discloses an automatic focusing optical system and visual detection equipment with the same, and relates to the technical field of optical detection. The system comprises a focusing module, the focusing module comprises a light source, a collimation unit and a beam expanding unit, the collimation unit is used for collimating a Gaussian beam emitted by the light source into a flat-topped beam, the beam expanding unit comprises a micro-lens array and a convex lens which are sequentially distributed in the emergent direction of the flat-topped beam, and a shielding piece is arranged on the light incident side of the convex lens; the front surface of the micro-lens array is used for dividing the flat-topped light beam into a plurality of sub-light beams, the rear surface of the micro-lens array is used for mutually superposing the focused sub-light beams to form a homogenized light beam, and the convex lens is used for expanding the homogenized light beam into parallel light beams; and the detection module comprises an objective table and an imaging unit, the objective table is used for bearing the to-be-detected sample, and the imaging unit is used for imaging and focusing through the parallel light beams reflected by the to-be-detected sample. By adopting the system provided by the invention, the uniformity of linear light spots can be obviously improved, and burrs and noise are eliminated.

The invention relates to an improved cage type light field imaging system and a debugging method, and belongs to the technical field of light field imaging, and the system comprises a main lens which is used for collecting light spots on an object surface, and enabling the light emitted by the light spots to be imaged on a micro lens; the micro lens is used for separating the light collected by the main lens into light beams in different directions and imaging the light beams on a virtual image plane; the relay lens is used for carrying out secondary imaging on the light beams in different directions to different pixels of a CCD detector of the camera; the relay lens comprises a first lens and a second lens, the focal lengths of the first lens and the second lens are positive, the focal length of the first lens is smaller than that of the second lens, and the magnification of the relay lens is larger than 1: 1. In the debugging process of the system, parallel light beams are arranged in front of the micro lens, and the position of the micro lens is determined in the mode that the parallel light beams vertically enter the micro lens. The system is not influenced by vignetting and distortion generated by the relay lens any more, and the debugging method improves the positioning precision of the micro lens.

A problem with unpaved roads is that they can be prone to damage when driven on. The road surface matting includes a first mat 1a and a second mat 1b, each mat having a series of substantially parallel beams 2, a plurality of spine rods 3 that run substantially perpendicular to and through the beams and connect the beams to one another. Each mat also has a joiner 7 adjacent an edge of the mat, arranged so that one of the spine rods passes through the joiner. The matting is such that the first and second mats are connected to one another by way of a connecting rod 8 that passes through and joiner 8 of one mat and the joiner 8 of the other mat.

The invention relates to the technical field of display detection, and more particularly discloses a display detection device and method based on visual inspection, and the device comprises a base assembly, the base assembly comprises a first base, the top of the first base is fixedly connected with a top plate, and the top of the first base is provided with a first middle groove and a second side groove; a transmission assembly is mounted in the first middle groove, the transmission assembly comprises a first motor and a first screw rod, a translation assembly is mounted on the outer side of the first screw rod, and a light source assembly and a detection assembly are mounted at the bottom of the top plate. Through the arrangement of the light source assembly and the translation assembly, the bottom of the light-emitting plate can emit parallel light beams to irradiate the display screen, the light is reflected by the surface of the display screen and absorbed by the detection assembly, the position of a drop point is calculated, and the thickness change value of the display screen is calculated to be converted and expanded into a distance difference; and high-precision detection of the thickness of the display screen is realized.

The invention discloses an immersed tube butt joint installation method and system based on laser ranging and visual recognition, and belongs to the technical field of ocean engineering. The method comprises the steps that a laser target set is installed on the butt joint end face of an installed pipe joint, and a laser positioning set and a laser projector are installed on the butt joint end face of a to-be-installed pipe joint; after the to-be-installed pipe joint sinks, the laser positioning group is started to measure the distance to the target group in real time, meanwhile, parallel light beams are emitted to the other end face of the to-be-installed pipe joint through the laser projector, and the position of a light spot is collected through visual recognition to obtain posture deviation; the distance and deviation data are fused, the optimal pose of the pipe joint to be installed is calculated through an optimization algorithm, and then the offset of the end face center and the axis deflection angle are obtained; and according to the parameters, a regulation and control instruction is generated, and the ballast water system and the winch system are controlled to adjust the posture of the to-be-installed pipe joint till accurate butt joint is achieved. According to the invention, full-underwater, high-precision and automatic immersed tube butt joint is realized, and the dependence on an overwater measuring tower and a GPS (Global Positioning System) is eliminated.