1068 results about "Optical measurements" patented technology

The invention relates to the technical field of spacecraft orbit control and space safety, and discloses a space debris orbit prediction and avoidance method, which comprises the following steps that: a ground computing center screens candidate targets and generates enhanced data packets for uploading; the spaceborne computer combines real-time navigation data to carry out geometric feature screening, and an instant high-risk target list is generated; controlling the star sensor to execute optical observation, and resolving an optical measurement relative orbit state by utilizing displacement superposition and Kalman filtering; selecting a high confidence coefficient or a conservative probability threshold according to the optical measurement state acquisition condition, and generating an avoidance instruction when the collision probability exceeds the limit; and the propulsion system responds to the instruction to execute avoidance, verifies the effect by confirming the semi-major axis variation and executes track recovery by selecting an aircraft. According to the method, the ground-air collaborative screening and shift superposition enhancement technology is adopted, the problems that the low-precision ephemeris false alarm rate is high and the detection capability of a satellite-borne sensor on a dark and weak target is insufficient are solved, and the accuracy of evasion decision making and the execution reliability are improved.

The invention relates to the field of optical measurement, in particular to a reflective interference film thickness measurement method and system for eliminating back scattering of a transparent substrate, and the method comprises the following steps: transmitting a light beam through a low-coherence-length broadband light source, and forming linearly polarized light through polarization modulation; focusing the light beam to the surface of the film through a confocal optical system; collecting reflection interference signals of the upper surface and the lower surface of the film; spatial filtering, low-coherence gating and polarization control are used for cooperatively inhibiting back scattering of the substrate. And processing the acquired interference signal, and calculating to obtain film thickness information. According to the invention, triple inhibition mechanisms are adopted for synergistic effect, and the method comprises the following steps: spatial filtering: shielding out-of-focus back reflected light through a confocal small hole; low-coherence gating: using a short coherence length to naturally suppress a reflected signal beyond a coherence range; and polarization control: further weakening stray light interference through polarization state matching, and effectively suppressing back scattering of the substrate.

The invention belongs to the technical field of computer vision and optical measurement, and discloses a three-dimensional reconstruction method and device based on multi-frequency fringe synchronous optimization and a medium, and the method comprises the following steps: based on a monocular structured light system, projecting a plurality of groups of sine fringe images with different frequencies to the surface of an object to be measured through a projector, and carrying out the stepping of a plurality of phases, acquiring a corresponding image sequence by using a camera; using a structured light phase shift method to obtain a relative phase value of a pixel point; obtaining an initial absolute phase value and modulation intensity based on a structured light phase shift method and a multi-frequency heterodyne method; and carrying out joint optimization on the absolute phase and modulation intensity parameters of the multi-frequency fringes through a Gaussian-Newton iteration method. According to the method, the anti-noise capability and the reconstruction precision are improved, a parameter adjustment and threshold recovery mechanism is introduced in the optimization process, the convergence stability and abnormal value elimination are ensured, and the method is suitable for high-precision structured light application scenes such as industrial vision measurement and complex surface detection.

The invention discloses a follow-up PIV boundary layer flow field test system and test method based on electrolytic hydrogen bubbles. The follow-up PIV boundary layer flow field test system comprises an integrated optical measurement module and a tracer particle generation module, the optical measurement module is arranged in the UUV and comprises a laser transmitter assembly, a sapphire prism and two imaging cameras which are symmetrically arranged, and laser sheet light forms a sheet light area on the outer surface of the UUV after being refracted by the sapphire prism; the tracer particle generation module comprises a cathode, an anode and a power supply unit, the cathode is a platinum wire array composed of a plurality of platinum wires arranged in the axial direction of the UUV, and the platinum wires are located at different heights away from the wall face of the UUV; the power supply unit selectively electrifies the platinum wire, independently adjusts the voltage, controls the number and frequency of generated hydrogen bubbles, and achieves the synchronous measurement of flow field information at different thickness positions of a boundary layer. According to the invention, boundary layer flow field in-situ follow-up measurement and synchronous fine measurement of different thickness positions under the condition of not changing the UUV shape are realized, and the device has the advantages of high integration level, small flow field disturbance, high measurement efficiency and the like.

The invention relates to the technical field of coupling alignment of single-mode optical fibers, in particular to an optical fiber coupling alignment method and system based on wavefront aberration and a sensitivity matrix. The system comprises an optical measurement module, a processing and control module and a multi-axis precision adjustment platform, and the alignment method comprises the steps that firstly, an interference fringe image is obtained and processed through an interference light path, continuous wavefront is recovered through Fourier transform and phase unwrapping, and a Zernike coefficient for quantizing wavefront distortion is obtained through Zernike polynomial fitting. A sensitivity matrix representing the linear relation between the degree-of-freedom adjustment amount and Zernike coefficient changes is established and serves as a physical guide item to introduce a speed updating formula of a particle swarm optimization algorithm, an SG-PSO algorithm is formed, a particle swarm is guided to conduct directional intelligent search and rapidly output the optimal adjustment amount, and finally a multi-axis precision adjustment platform is driven to complete alignment. According to the method, optimization of wavefront sensing and physical model guiding is effectively fused, and the convergence speed, the alignment precision and the global search capability are remarkably improved.

The invention relates to the technical field of LED display testing, in particular to an LED screen backlight module performance testing system which comprises the steps that a model identification code of a module to be tested is received, a corresponding standard optical parameter set is called, and initial driving current is applied. Actual optical signals driven by different currents are collected through a light sensing probe array and converted into a digital optical measurement value set containing brightness and color coordinate values of multiple sampling points. Comparing the brightness measurement value with a target brightness value point by point to generate a brightness consistency deviation matrix; and judging the color coordinate measurement value and the target range, and generating a color coordinate qualified identifier list. And calculating an actual brightness uniformity value according to the deviation matrix, and comparing the actual brightness uniformity value with a standard threshold value. And if the actual brightness uniformity value reaches the standard and the color coordinates of all the sampling points are qualified, generating a module qualification judgment instruction. According to the system, automatic and high-precision comprehensive evaluation of brightness space uniformity and chromaticity consistency of the backlight module is realized.

The invention belongs to the technical field of side slope monitoring, and relates to a high-precision side slope monitoring device and method based on a measuring robot, and the device comprises a displacement target which is fixedly disposed on a side slope to mark a monitoring point; the measuring robot is used for performing optical measurement on the displacement target to obtain slope displacement data; the supporting structure is used for fixing the measuring robot; the displacement monitoring module is arranged in the supporting structure and is used for monitoring the displacement change of the supporting structure in real time so as to obtain the displacement data of the supporting structure; and the data processing unit is used for performing correction calculation by combining the slope displacement data and the support structure displacement data in the same coordinate system to determine the absolute displacement of the slope. According to the invention, a slope monitoring point is marked by using the displacement target, the measurement robot carries out optical measurement to obtain slope displacement data, meanwhile, the GNSS module monitors the displacement change of the supporting structure in real time, and data correction calculation is carried out in the same coordinate system to determine the absolute displacement of the slope.

The application discloses an indoor water tank sediment starting speed measurement system and method, and aims at solving the technical problem of sensor disturbance to a flow field and influence on data accuracy in the prior art measurement method.The technical scheme core is that the non-contact measurement characteristics of the PIV technology are applied to the whole process from flow field construction to data acquisition.The device is mainly composed of an imaging unit, a laser illumination unit, a movable sliding frame, a water flow adjusting unit and a buffer plate.Optical measurement is performed through the imaging unit and the laser illumination unit, and physical sensors do not need to be arranged in the flow field, so that the interference of the measuring instrument on the water flow structure and the sediment starting process is fundamentally avoided.The integrated movable sliding frame integrates the sediment laying, particle throwing and measurement functions, and is convenient for quickly positioning a test area;in combination with the buffer plate and the water inlet and drainage adjusting unit, a gradually changing flow field from weak to strong can be accurately and stably simulated.

The invention discloses a Shack-Hartmann wavefront detector centroid calculation method and related equipment, and relates to the field of optical measurement, and the method comprises the steps: obtaining a light spot array grayscale image, detecting the local maximum value of each light spot, and dividing sub-aperture image regions corresponding to micro lenses one by one according to the local maximum value; extracting a gray matrix of each sub-aperture image region, respectively determining one-dimensional regions of a light spot main lobe in row and column directions, and intersecting to obtain a main lobe region; a main lobe area is deducted from the sub-aperture image area to form a threshold calculation area, and the maximum gray value of the threshold calculation area is selected as a threshold; and performing threshold reduction on pixels in the sub-aperture image area, setting a negative value to zero, and calculating the position of the mass center of the light spot based on the processed image. According to the method, sub-aperture adaptive threshold and local background removal are realized, weak light spot information loss caused by a unified threshold is avoided, and the precision of centroid calculation and wavefront restoration is improved.

The invention provides an out-of-focus lens microlens diopter measurement method, system, medium and device, and relates to the technical field of optical measurement, and the method comprises the steps: placing a to-be-measured out-of-focus lens on a rotary table; controlling a Z-axis motion guide rail to drive a line measurement sensor to move, and determining a path scanning zero point; the rotary table is controlled to rotate at a constant speed, and the X-axis movement guide rail and the Z-axis movement guide rail drive the line measurement sensor to move so as to obtain point cloud data of the upper surface of the to-be-measured out-of-focus lens; performing conversion, fitting and data extraction on the point cloud data to obtain a two-dimensional profile curve of each micro lens unit included in the to-be-measured defocus lens; and calculating the diopter of each micro-lens unit according to the two-dimensional profile curve of each micro-lens unit. According to the method, independent quantitative evaluation of the additional diopter of the microstructure is realized, and the defects that the macroscopic diopter and the microstructure diopter cannot be separated by a lensometer and the macroscopic diopter and the microstructure diopter are difficult to accurately disassemble in an existing non-contact technology are overcome.

The invention relates to a non-Lambert surface emissivity inversion method, belongs to the technical field of infrared optical measurement and radiation modeling, solves the technical problems of low precision and poor model stability of non-Lambert surface emissivity inversion, and comprises the following steps: measuring original radiation intensity of a non-Lambert surface of a to-be-tested material in different emergent directions; converting the original radiation intensity into directional reflectivity; on the basis of the generalized Lorentz function, diffuse reflection background items are superposed, and a physical prior model is constructed; physical constraint is carried out on the physical prior model parameters; the parameter residual network generates a parameter field, and the parameter field is input into the optimized physical prior model; and carrying out hemispherical integration, and converting the directional reflectivity into directional-hemispherical emissivity. The device and the method are used for infrared thermal imaging measurement, material radiation characteristic characterization and engineering detection in a complex environment.

A method having the steps of measuring a geometry of a toothing using an optical measuring system, wherein a numerical aperture of the optical measuring system is adjustable and the numerical aperture of the optical measuring system is adapted depending on at least one geometric parameter of the toothing to be measured and / or is enlarged or reduced.

The invention relates to the technical field of optical measurement, and discloses a biaxial galvanometer error calibration method and system, electronic equipment and a storage medium, and the method comprises the steps: obtaining a camera internal reference containing an internal reference matrix and a distortion coefficient through a calibration board; establishing an ideal geometric transformation model of the biaxial galvanometer, and defining a first galvanometer transformation matrix determined by the rotation angle of the first galvanometer and the first distance and a second galvanometer transformation matrix determined by the rotation angle of the second galvanometer and the second distance; installing error parameters are introduced, and a complete coordinate transformation model used for describing a complete light path transformation relation from an actual camera coordinate system to a final imaging coordinate system is formed; calibration data are collected, galvanometer system parameters and installation error parameters are optimized based on re-projection errors, re-projection residual errors are constructed, the re-projection residual errors are minimized through a nonlinear optimization algorithm, and optimal parameters are obtained. The installation error can be accurately calibrated and effectively compensated.

The invention discloses an underwater long-distance scanning system based on an active calibration plate and a calibration method thereof, and relates to the technical field of underwater optical measurement and three-dimensional reconstruction, the underwater long-distance scanning system comprises a laser emission module which is carried on a bow part of an underwater vehicle and is composed of a laser, a galvanometer I and a galvanometer II, the first galvanometer is used for scanning a point laser beam into a line laser, a line laser scanning effect is formed, and then the second galvanometer is used for changing the angle of the line laser. The active calibration plate adopts an active light-emitting design, each light-emitting point serving as a circular calibration feature point can be independently lightened and covered with frosted glass to soften light, the signal-to-noise ratio of the feature points in an image can be increased, the problems of weak natural light, serious water absorption and scattering interference in an underwater environment are solved, and in combination with a circular light spot form, the calibration accuracy is improved. The coordinate of the circle center is conveniently and accurately extracted in image processing, high-precision feature positioning is realized, and a reliable feature data basis is provided for light plane fitting and system calibration.

The invention relates to a structured light illumination confocal super-resolution measurement system and method, and relates to the technical field of optical measurement. The system comprises a digital micromirror device (DMD), a sample platform, an electric displacement platform, a microscopic imaging assembly, a complementary metal oxide semiconductor (CMOS) imaging assembly and computer equipment, and the DMD is used for adjusting the point light source array and the structured light field. According to the DMD-based confocal super-resolution measurement method, a structured light field and a signal-noise separation technology are combined, and high-precision and high-resolution three-dimensional surface reconstruction can be realized. By using the flexibility of the DMD and the advantages of the super-resolution technology, the spatial resolution and speed of confocal imaging are effectively improved, so that the measurement process is more accurate. In addition, low-rank decomposition and self-supervised deep learning methods are fused, the image reconstruction process is optimized, noise interference is suppressed, and the overall performance of the system is further improved.

The invention discloses a multifunctional asphalt mixture rut test method which is implemented by using a device integrating loading and measurement, test piece supporting and temperature control drainage, environment simulation and optical measurement and a central control and data acquisition system. A test piece is arranged in the test piece groove, temperature control is realized through circulating a heat-conducting medium in the temperature-conducting cavity, different gradients are formed through the hoisting mechanism and the angle adjusting assembly, the test wheel is driven to perform one-way circulating loading along a closed track and snub at a preset moment, and rolling and sliding friction forces are synchronously collected; in the test process, rainfall is simulated by adopting the watering assembly, incoming water is recycled by the drainage tank, speckle images are acquired by the high-frequency industrial camera, and surface full-field displacement and strain are obtained through digital image correlation analysis. Through time registration and fusion of temperature, gradient, wheel speed, rainfall and friction-deformation data, rut deformation, skid resistance and apparent structure evolution laws of the asphalt mixture under multi-climate and multi-gradient conditions are obtained.

The invention relates to the technical field of optical detection and automatic control, and discloses a computer vision-assisted nano-particle recognition and micro-spectrum automatic measurement system, which comprises a sample positioning module, an imaging module, an optical measurement module and a processing control module, automatic focusing is realized on the basis of a definition evaluation value calculated by performing Fourier transform on the microscopic image; graying, binaryzation and morphological operation are carried out on the focused image so as to identify effective nano-particles and calculate centroid coordinates of the effective nano-particles; according to the coordinates of the center of mass, the X axis and the Y axis of the electric three-axis displacement table are controlled through closed-loop iteration movement, and the measured particles are accurately positioned to the center of the view field. According to the invention, the problems of low manual measurement efficiency, poor repeatability and complex operation in the prior art are solved, and high-flux, full-automatic and high-precision measurement of the spectral characteristics of the nanoparticles is realized.

The embodiment of the invention provides a light field space coherence length measurement method and system, and relates to the technical field of optical measurement. The method may first obtain a training set and train a measurement model using the training set. And obtaining an interference fringe image through numerical simulation generation or experimental acquisition, and inputting the interference fringe image as an input image into the measurement model so as to output a spatial coherence length prediction value of the input image through the measurement model. Wherein the measurement model is a convolutional neural network model for performing feature extraction by adopting a multi-layer cascaded convolutional pooling structure, and the features can be mapped into a spatial coherence length predicted value through a full connection layer. According to the method, one-step measurement from the original interference image to the coherence length can be realized, a tedious fringe contrast calculation process is avoided, the influence of experimental noise on measurement precision is reduced through depth feature extraction, the whole prediction process can be completed within millisecond-level time, and the measurement efficiency of the light source space coherence length is improved.

The invention belongs to the technical field of laser volume calibration, and particularly relates to a laser volume calibration system for a laboratory portable pipettor, which comprises a volume calibration equipment main body and a calibration container, and is characterized in that the volume calibration equipment main body is integrated with an integrated optical measurement module, a data acquisition and intelligent processing unit and a man-machine interaction module; the height change of the liquid level center point can be accurately measured, the specific forms such as the contact angle, the curvature radius and the depth of the liquid level meniscus can be captured and analyzed in real time through images, the liquid level form correction module can accurately calculate the missing volume caused by the concave meniscus by using the parameters, and the accuracy of the missing volume is improved. According to the method, the actual liquid level height is calculated and compensated to the final actual liquid level height, the systematic measurement deviation caused by neglecting the geometrical shape of the meniscus in a traditional single laser ranging method can be fundamentally solved, the volume measurement precision is remarkably improved, and the calibration precision can be improved to a new level.

The invention discloses a pose detection device and method based on array type laser reflection focal spot monitoring, three collimation lasers are arranged in an array mode, an optical measurement method similar to an optical lever is adopted, when an optical element has height deviation, the positions of three light spots are equivalently changed on an imaging screen at the same time, and the position of the three light spots is detected. When the optical element has angle deviation, the distance of the light spots on the imaging screen is changed, and the change quantity is related to the laser incident angle, the light beam spacing distance and the element deflection angle, so that the light spot position image shot by the light spot imaging visual camera can be accurately positioned. And the pose information of the optical element located on the optical element positioning tool can be obtained through accurate inversion, so that accurate online detection of the angle and height information in the vertical plane of the optical element is achieved by bypassing a lateral view field, and then accurate grabbing of the optical element can be achieved in a matched mode.

The invention belongs to the technical field of intelligent manufacturing of plastic packaging containers, and particularly discloses an intelligent blow molding and wall thickness closed-loop control system for PET plastic bottles, which integrates feedforward correction and closed-loop feedback, pre-corrects process parameters by acquiring characteristic parameters of raw materials, and generates point cloud data in combination with full-circumferential scanning of a non-contact three-dimensional optical measurement device. A partition three-dimensional model is constructed, and the wall thickness is accurately calculated; and based on the wall thickness deviation data, blow molding process parameters are dynamically adjusted through the mapping relation database, and a grading quality control strategy, a multivariable self-adaptive feedback mechanism and an online incremental learning mechanism are configured. The system realizes self-adaptive compensation under working conditions of raw material fluctuation, environmental disturbance and the like, improves wall thickness control precision and product consistency, reduces manual intervention, ensures high-speed continuous production, has self-learning and long-term stable regulation and control capabilities, and provides technical support for light-weight and high-precision forming of PET bottles.

In a method for reading identification information inscribed in a wafer (14) in the form of an identification mark (16), at least one measuring beam (24; ML) of an optical measuring device (20; 110), comprising either an optical coherence tomograph (22) or a chromatic confocal distance sensor (110), scans an area (18) of the wafer (14) in which the identification mark (16) is inscribed. The identification mark (16) is recognized from measurement data generated from the scanning of the wafer (14). Based on the recognized identification mark (16), the identification information associated with it is determined.

Polarization BRDF characteristic measuring device and method, belong to optical measurement technical field, the present application is to solve the existing BRDF or polarization BRDF measurement slow, low efficiency problem of measurement.The scheme of the present application: the laser light source at the second focal point emits laser light vertically through the circularly polarized light generating system and the polarizing system, the circularly polarized light generating system converts the laser light emitted by the laser light source into circularly polarized light, the polarizing system quantitatively changes the polarization state of the circularly polarized light to form the measuring incident light, the incident light is transmitted through the transmission light of the half mirror, and is reflected by the ellipsoidal mirror to the surface of the sample to be measured at the first focal point, the reflected light wave of the surface of the sample to be measured is reflected again by the inner surface of the ellipsoidal mirror, and is transmitted to the second focal point direction and is reflected by the half mirror, and the reflected light wave is converged to the third focal point of the measuring system through the polarizing system, the polarizing system is adjusted with the polarizing system, and the polarization BRDF characteristic of the sample to be measured is measured.

The invention relates to the technical field of optical measurement, in particular to a two-dimensional displacement measurement sensor based on a 1.5 D grating ruler and a scanning plate. The two-dimensional displacement measurement sensor based on the 1.5 D grating ruler and the scanning plate comprises the grating ruler and a read head module, through one-dimensional gratings which are orthogonally arranged, Talbot imaging which is orthogonally arranged is achieved, then two-dimensional displacement detection is achieved, the grating structure is simplified, and the production cost is reduced; meanwhile, the photoelectric detector group adopts a single integrated detection module to realize two-dimensional signal acquisition and reference zero signal acquisition, so that the number of components is reduced, and the power consumption of the sensor is reduced; besides, the photoelectric detector adopts the Talbot imaging principle, and based on the optical principle characteristic, the photoelectric detector has the characteristic of large installation tolerance, can be suitable for a high linear density grating ruler, and can realize nanoscale resolution measurement in cooperation with a high-power interpolation subdivision processing circuit. Therefore, the application requirements of multi-degree-of-freedom measurement, high precision, small size, low power consumption and large installation tolerance are met.

The invention discloses a method for measuring and planning deformation in additive and subtractive alternate mixed manufacturing of metal cavity parts. According to the additive and subtractive mixed manufacturing technology, by combining the design freedom degree of additive manufacturing and the high precision advantage of subtractive manufacturing, complex cavity parts can be effectively machined, but accumulative stepped deformation can be caused by the repeated thermodynamic effect and alternate procedures; according to a traditional optical measurement method, measurement data are difficult to completely capture due to the problems of internal shielding and surface reflection of a cavity, and point cloud registration errors exist. According to the method, multi-axis on-machine measurement is embedded into an additive and subtractive alternate process sequence, a measurement point directly comes from a cutter contact of a cutting path, the multi-axis on-machine measurement precision and the measurement accessibility of a deep cavity structure are ensured, and a measurement path is optimized by combining probe attitude planning and a customized traveling salesman algorithm; the probe and the cutter share the same coordinate system, so that the point cloud registration link required by optical measurement is eliminated, and the data precision is remarkably improved.

The invention discloses a radar photoelectric cooperative detection method and system based on radio orientation and optical measurement, and belongs to the field of radio fixed.The method comprises the steps that a radio signal of a target is obtained, parameter estimation is conducted on the radio signal, and direction-of-arrival data and statistical characteristic parameters of the target are obtained; generating a guide instruction according to the direction of arrival data to drive a photoelectric detection device to point to the airspace where the target is located, and obtaining real-time optical image data of the airspace where the target is located through the photoelectric detection device; projecting the error uncertainty range to a two-dimensional plane of the real-time optical image data, and generating an adaptive probability search area; performing visual feature extraction on the real-time optical image data in the adaptive probability search area, and detecting to obtain at least one candidate visual target; and calculating the association confidence of each candidate visual target and the direction of arrival data, and judging a final detection target. According to the invention, closed-loop self-calibration of the whole radar photoelectric system is realized.

The invention relates to the technical field of optical measurement, in particular to a second harmonic characterization system based on incident light angle adjustment and three-polarization dimension cooperation, and provides the following scheme for solving the problems that in the prior art, an SHG measurement system is limited in incident / emergent angle adjustment range, insufficient in polarization state regulation and control precision, low in automation degree and low in system integration degree. The device comprises a front-end light path assembly, a sample testing light path assembly, a rear-end light path assembly, a sample table and a control unit, the front-end light path assembly is used for filtering and collimating the laser; according to the sample test light path assembly, incident angles of different lasers are achieved through a 180-degree transmission and reflection test rotary table, and finally multi-angle and multi-polarization-state SHG signal collection is completed through the rear-end light path assembly and the control unit. According to the invention, high-precision SHG characterization with continuously adjustable incident angle from 0 degree to 90 degrees, multi-dimensional cooperative control of polarization state and automatic adjustment of sample orientation is realized, and the test efficiency and the system integration degree are remarkably improved.

A light-emitting element array includes a substrate, plural light-emitting elements arranged on the substrate, plural constriction grooves being provided in a periphery of each of the plural light-emitting elements, and forming a current constriction layer that constricts a current flowing through a light-emitting layer by oxidizing the light-emitting layer, and a block separation portion that is formed so as to overlap a part of the plural constriction grooves in plan view, and separates the plural light-emitting elements into plural blocks.

The invention provides a method and a system for controlling the length of a high-density interconnection plate back drill stub. The control method comprises the following steps: S1, measuring the plate thickness (H4) of a back drill hole position of a whole plate after drilling; s2, extracting thinnest, thickest and middle thickness representative plates; s3, measuring the thickness (H1) of the dielectric layer hole by hole by using optical measurement equipment, and determining the depth by abutting a probe against the signal layer PAD; s4, establishing a reference relationship between the intermediate plate H4 and the intermediate plate H1; s5, dynamically calculating H1 of each plate according to the reference relationship and the actual measurement H4; s6, calculating a back drilling depth set value in combination with the actually measured copper thickness (H2) and the safety distance; and S7, generating and executing a machining program. According to the method, the length of the stub is accurately controlled by dynamically compensating the plate thickness difference. According to the method, the problem of back drilling depth control deviation caused by plate thickness tolerance can be effectively solved, the length volatility of the stub is reduced, and meanwhile, a signal layer is prevented from being damaged.

The invention relates to the technical field of fluid dynamics experimental measurement, and discloses a water tank experimental device and method for muddy current transportation of micro-plastics, the device comprises a water tank device main body, an optical measurement subsystem and an ultrasonic Doppler flow velocity measurement system, an ultrasonic emission path and an optical measurement window are overlapped in space, and the optical measurement subsystem and the ultrasonic Doppler flow velocity measurement system are arranged in the water tank device main body. The method comprises the following steps: performing first fluorescence labeling and second fluorescence labeling on the micro-plastic particles and the sediment particles; synchronously acquiring optical data and acoustic data in the cross window; respectively establishing a concentration correction function and a flow velocity correction function by taking acoustic backscattering intensity data and flow velocity data as references in the cross window; applying the correction function to the whole optical window to obtain a globally corrected concentration field and a globally corrected flow velocity field; and distinguishing and quantifying the micro-plastics and the sediments based on the corrected data. Through the cross correction principle, the problem of signal distortion of optical measurement in high-turbidity fluid is solved.