506 results about "Fast measurement" patented technology

The invention relates to a concrete working performance measurement method and system based on a multi-modal visual large model, and solves the problem that rapid detection of concrete working performance parameters is troublesome, and the method comprises the steps: based on the spatial semantic understanding capability of the multi-modal visual large model, combining a multi-view stereoscopic vision and structured light scanning technology, and calculating the working performance of concrete; reconstructing a three-dimensional geometric structure of the concrete slurry, extracting morphological characteristic parameters, and forming characteristic vectors; inputting the feature vectors into a pre-trained multi-task neural network, fusing the spatial-temporal features and combining a rheological algorithm to identify various working performance parameters; integrating identification results for at least three times by adopting integrated learning, and verifying parameters based on a fluid dynamics basic equation through a fluid simulation platform; and based on the verification result, generating a mix proportion optimization suggestion containing the material components. The method has the advantages that non-contact rapid measurement of concrete working performance parameters is achieved, precision and efficiency are improved, and mix proportion optimization suggestions are provided.

The invention discloses a rapid measurement method and system for geometric irregularity of a track in a turnout zone. The method comprises the steps that complete three-dimensional point cloud data of the surface of a railway turnout steel rail are obtained in real time through a multi-angle line structure laser scanner on a special detection vehicle body; accurate attitude and position data of the detected vehicle body in the measurement process are obtained in real time through an inertial navigation measurement unit and an odometer; obtaining a high-precision pose of a detected vehicle body through a robust dead reckoning method of an IMU (Inertial Measurement Unit) assisted by a speedometer dynamic lever arm value based on a variable wheel-rail contact point; constructing a turnout area three-dimensional point cloud model; extracting geometric irregularity key points of turnout steel rail point cloud from the turnout area three-dimensional point cloud model; calculating parameters of track gauge, horizontal and rail direction irregularity and unevenness; the special detection vehicle body can quickly and stably pass through a turnout area to complete continuous and accurate measurement of geometric irregularity of a track.

The invention discloses a straight gear shape-free measurement method based on single-group line structured light. The method comprises the following steps: constructing an optical platform coordinate system, carrying out line structured light coordinate system calibration through a spherical calibration body, and calibrating the rotation center of a precision turntable; installing a measured straight gear, establishing a straight gear coordinate system, and adjusting the position of the linear structure optical measuring head, so that the measuring field of view of the linear structure optical measuring head covers a root circle to an addendum circle of the straight gear; the straight gear is installed on a precision rotary table, the straight gear is driven to rotate at a constant speed, a linear structure optical probe scans and collects straight gear contour point cloud data and circular grating angle information, and tooth surface three-dimensional point cloud data is obtained; based on the three-dimensional point cloud data of the tooth surface, extracting an addendum circle, a dedendum circle and an involute tooth profile, and calculating spur gear parameters; performing reverse three-dimensional shape modification tooth surface identification on the shape modification straight gear to generate a three-dimensional deviation diagram; and outputting a measurement result and printing a report. The problems of shape-free rapid measurement, modification tooth surface identification and tooth surface three-dimensional deviation characterization of the straight gear with unknown basic parameters are solved.

The invention discloses a method and a system for rapidly measuring cable force of a stay cable based on a digital image correlation method. The method comprises the following steps: acquiring video data of the stay cable; a line segment measurement calibration method is adopted, stay cable texture points serve as feature points, and a feature point selection mechanism is established; establishing a pixel-physical space coordinate mapping model based on a redundant observation method; model parameters are calculated through a collaborative calibration method; performing displacement measurement based on a digital image correlation method; establishing a double-layer feature extraction mechanism to complete local and global feature extraction; weight distribution of the local features and the global features is dynamically adjusted through a weight adaptive fusion strategy; and finally, establishing a double-layer tracking and failure recovery mechanism to complete hierarchical collaboration of coarse-grained global tracking and fine-grained local tracking. And carrying out fast Fourier transform on the dynamic displacement measurement result, and calculating to obtain the cable force. And reliable technical support is provided for non-contact accurate calculation and measurement of the cable force.

The present invention relates to a shield tunnel segment dislocation measurement method based on three-dimensional laser scanning, mainly solving the technical problems of low efficiency, high cost, unsafe high-altitude operation, etc., of existing manual shield tunnel segment dislocation amount measurement technology. The method comprises the steps of: S1, generating a grayscale image on the basis of tunnel laser point cloud data, and performing edge detection on the grayscale image; S2, on the basis of the edge-detected image, collecting statistics about column grayscale cumulative values of the edge-detected image, and realizing circumferential joint position identification by means of threshold determination; S3, selecting a certain angle range on the left and right of a circumferential joint to divide different intervals, collecting statistics about an interval densest radial vector, and calculating a circumferential joint dislocation amount; S4, designing a feature convolution kernel on the basis of shape features of a longitudinal joint, and using the feature convolution kernel to perform convolution calculation on a segment grayscale image in a sliding window manner to identify the position of the longitudinal joint; and S5, selecting point cloud data within a certain range on the left and right of the longitudinal joint, screening for local valid points, and calculating a longitudinal joint dislocation amount. The present invention achieves automatic identification of a longitudinal joint of shield tunnel segments and rapid measurement of a dislocation amount.

Disclosed in the present invention is a three-dimensional laser point cloud-based cable force measurement method for a stay cable. Stay cable actual measurement line shape fitting is performed by utilizing point cloud data, obtained by means of three-dimensional laser scanning, of the stay cable, and on the basis of a finite element calculation method, a line shape that is calculated by a stay cable finite element model and is the same as the actually measured line shape of the stay cable is found, thereby determining an actual cable force of the stay cable, and achieving the purpose of accurately measuring the cable force of the stay cable. According to the present invention, a three-dimensional laser scanning technology is introduced and applied to cable force measurement of a stay cable, and for the defects of a common cable force measurement method, the characteristics of non-contact measurement, high measurement precision, high measurement efficiency and the like of the three-dimensional laser scanning technology are utilized so as to achieve rapid measurement of the line shape and the section size of the stay cable. On the basis of finite element calculation and analysis, the three-dimensional laser point cloud-based cable force measurement method for the stay cable is provided, thereby achieving rapid and efficient measurement of the cable force of the stay cable.

A method for identifying and calculating the volume of over- and under-excavation in tunnels based on laser point clouds belongs to the field of intelligent tunnel construction and blasting quality assessment technology. Technical solution: The scanned point cloud data is denoised; a design contour point cloud is generated and aligned with the centerline of the actual excavated tunnel; the actual collected tunnel excavation point cloud and the design contour point cloud are Delaunay tetrahedralized; the actual tunnel point cloud is traversed, and the vector dot product formed between the point cloud and the triangular sides of the convex hull is calculated; over- and under-excavation areas are identified; a polyhedron is constructed from the design contour point cloud and the actual excavated area point cloud constituting the area; the polyhedron is divided into quadrilaterals, and the volume of each quadrilateral is calculated, thereby calculating the volume of each over- and under-excavation area. Beneficial effects: This invention can quickly measure over- and under-excavation areas and quantities that are difficult to calculate in tunnel blasting quality assessment, and can replace cumbersome and time-consuming total station and manual measurement methods; this method has the advantages of high precision, high efficiency, and high flexibility.

The invention provides an integrated measurement device, a beam parameter quality control method and related equipment, relates to the technical field of particle radiotherapy, and is used for rapidly measuring beam parameters of pencil beam scanning points in arc proton therapy in real time. Comprising a plurality of measurement units which are arranged at intervals along a beam transmission direction, the plurality of measurement units are periodically and repeatedly arranged to form a two-dimensional orthogonal sampling grid, and time-space distribution data of a beam cross section are synchronously acquired through one-time beam output; the analysis module is used for processing the beam parameters output by the signal acquisition and processing module in real time, and the beam parameters comprise the scanning point position, the beam spot size, the charge quantity and the range; beam parameters of a pencil beam scanning point can be rapidly measured in real time, and accurate and efficient measurement is ensured; according to the matched beam parameter quality control method, the accuracy and reliability of arc proton treatment are improved through operations such as multi-angle measurement, parameter correction, quality control interval optimization and real-time dynamic adjustment.

The present application relates to the field of measurement technology, and in particular to a rapid measurement system for aviation blades based on a four-line structured light sensor, wherein the measurement system comprises: four line structured light sensors and a calculation processing module mounted on a three-dimensional coordinate measuring machine; determining the equation of the laser plane in the camera coordinate system based on a target; solving the three-dimensional coordinates of the target point on the intersection of the laser plane and the blade in the camera coordinate system based on the equation; establishing a transformation relationship between the camera coordinate system and the machine coordinate system of the three-dimensional coordinate measuring machine, converting the target point to the machine coordinate system, and realizing three-dimensional scanning measurement; obtaining the point cloud data of the standard sphere in the sensor external parameter calibration module, fitting and outputting a point cloud sphere; using the center of the point cloud sphere as the measurement reference, combining the measurement data of multiple line structured light sensors to obtain the measurement result. Through the present application, only one-dimensional movement along the Z axis of the three-dimensional coordinate measuring machine is required to complete the measurement, thereby improving the measurement efficiency.

The invention discloses a method for detecting the head height of a bolt, and the method comprises the following steps: carrying out the projection of the head of the bolt through employing a structured light 3D camera, and obtaining the three-dimensional point cloud data of the head of the bolt; after abnormal points are processed, a bolt head area template is constructed; bolt head positioning is carried out on the bolt head area template and the actual detection area; selecting a plurality of local point cloud data in the bolt head area, and setting the local point cloud data as bolt head positions; selecting a plurality of local point cloud data on the outer side of the bolt head area, and setting the local point cloud data as bolt reference surface positions; and calculating the distance between the bolt head position and the bolt reference surface position by using a point-to-plane algorithm. The bolt head height detection method provided by the invention has the advantages of one-key operation, simple operation, fast measurement speed, automatic data and picture storage, and solving of pain points which cannot be traced by conventional contact measurement.

The utility model relates to a device for measuring the three-dimensional shape of a sample with non-uniform reflectivity. The device comprises a structured light illumination element DLP, a collimating lens group, a polarizing beam splitter, a 1 / 4 wave plate, a motor, a dispersion tube lens, an objective lens, an objective table for placing the sample to be measured, a focusing lens, a dichroic mirror, a first optical filter, a first camera, a total reflection prism, a second optical filter, a second camera and a microprocessor, the 1 / 4 wave plate, the motor, the dispersion tube lens, the objective lens, the objective table, the focusing lens, the first camera and the second camera are perpendicular to the same optical axis, and the structured light illumination element DLP, the polaroid and the collimating lens group are parallel to the same optical axis and are perpendicular to the optical axis reflected by a tested sample. According to the utility model, the structure is simple, the first camera and the second camera can rapidly acquire images of two wavebands of a sample with non-uniform reflectivity based on the structured light illumination element DLP, and the microprocessor rapidly measures the height difference of the sample with non-uniform reflectivity based on the images of the two wavebands.

The invention relates to the technical field of coal moisture content measurement, in particular to a coal moisture content rapid measurement method and system based on a convolutional neural network. Coal flow hyperspectrums, images and pulse flows are synchronously collected, aligned segmentation is executed, and evaporation stages are divided based on spectral reflectivity time sequence fluctuation to obtain segmented codes; and constructing water film roughness distribution by combining image gray and gradient features, cascading a time-space sequence to generate a fusion feature vector, implementing time scaling and interpolation filling on an effective fragment according to a belt speed, and aggregating and outputting the coal moisture content. According to the method, hyperspectral and image pulse streams are associated to align data and eliminate missing frames, reflectivity time sequence fluctuation is analyzed to divide evaporation stages and establish indexes, gray and gradient features are fused to construct a roughness texture matrix, space-time sequences are cascaded to generate feature vectors, and sequence scaling and interpolation filling are dynamically executed according to belt speed. Speed interference is eliminated, spectrum deviation is corrected, and finally accurate analysis of the coal flow moisture under the variable running speed working condition is achieved.

The invention relates to a distortion degree measuring system and method based on correlation operation, and the system comprises a signal source which is a to-be-measured signal source for outputting a mixed waveform comprising a fundamental wave and each harmonic component; the fundamental wave extraction module is used for separating and extracting a fundamental wave component of which the waveform is a single-frequency square wave from the signal to be detected; the phase-locked loop frequency multiplication module is used for receiving the fundamental component and locking and extracting a sine wave signal containing the fundamental component and a harmonic component through a phase-locked loop containing a programmable frequency divider; the correlator module is composed of a multiplier circuit and a low-pass filtering and amplifying circuit, receives a to-be-measured signal serving as an input signal and a sine wave signal serving as a reference signal, and outputs a direct-current component; and the single chip microcomputer is configured with the programmable frequency divider, samples the direct current component output by the correlator module, calculates the relative amplitude and the total harmonic distortion degree of the fundamental wave component and the harmonic component, and outputs the total harmonic distortion degree. The beneficial effects are that the measurement system and the signal processing method are suitable for signal harmonic analysis under a complex harmonic environment and a low signal-to-noise ratio condition, a high-performance processor and a computing power requirement are not needed, and the system takes an analog circuit as a main body and has the advantages of high measurement speed, high accuracy, low system cost and the like.

The present invention discloses a method for measuring the lead of steel bars based on 3D vision. First, a depth map of the steel bars is captured by a 3D camera, and then the threshold segmentation algorithm is used to extract the rectangular contour of the steel bars and extract the center line of the rectangle. Next, the depth values of all points on the center line are obtained and exported to an Excel table. Subsequently, based on the exported Excel table, Python is used to draw a function graph of the pixel coordinates and depth values of the points on the center line. Then, the filtering algorithm is used to optimize the function graph and find the maximum points. Finally, two maximum points between the specified pixel coordinate points are selected to calculate the lead of the steel bars. The present invention realizes the non-contact measurement function of the lead of steel bars with automation, and has a relatively fast measurement speed and good measurement effect for the lead of steel bars. It also avoids the large lead measurement error caused by the measurement method based on 2D vision. This measurement method has high measurement accuracy and is less affected by the environment, and is suitable for being widely promoted and used.

The invention discloses a tunnel blasting damage rapid measurement method and system based on a wall-climbing robot, and the method comprises the following steps: S1, laying a three-dimensional optical fiber network, recording the coordinates of each section of optical fiber, and building a mapping relation between an optical fiber node and a space coordinate position; s2, constructing an initial three-dimensional wave velocity model of the tunnel rock mass; s3, correcting the velocity fields of the reflected wave and the winding wave to obtain an optimized wave velocity model; s4, exciting artificial seismic sources at a plurality of positions in the tunnel through a wall-climbing robot with an electromagnetic vibration exciter, and performing data acquisition by a DAS system through an optical fiber network; s5, processing the data acquired in the step S4, carrying out wavelength separation on the reflected wave and the diffracted wave, and respectively carrying out migration imaging on the reflected wave and the diffracted wave after classification; and S6, fusing imaging results of the reflected wave and the diffracted wave through a weight coefficient, and generating a comprehensive geologic model.

The invention discloses a method for rapidly measuring the thickness of a thin film based on Chirp-Z transformation. The method comprises the following steps: 1) collecting spectral data; 2) data preprocessing; 3) CZT (linear frequency modulation Z transform) parameter configuration and CZT frequency spectrum calculation; according to the method, after the processed data collected by the spectrograph are received, data preprocessing is carried out, spectral analysis is carried out through Chirp-Z transformation, the spectrum peak value is obtained for accurate positioning, the film thickness is calculated through the effective refractive index, and therefore efficient and high-precision film thickness measurement is achieved.

The invention discloses a long groove workpiece geometric quantity rapid measurement method based on multiple target stations, and the implementation process of the method comprises the steps: installing an industrial robot, the tail end of which is additionally provided with a structured light sensor, on a ground rail or hanger rail system, and achieving the long-distance movement along the axial direction of a workpiece; a plurality of target stations are arranged on the side of the track, and coordinate systems of the target stations are subjected to global coordinate system unification through a laser tracker; in the segmented parking measurement process of the robot, synchronously collecting the profile of the section of a workpiece and the feature point data of an adjacent target station, and converting the coordinates of the section of the workpiece into a global coordinate system by using a pre-established conversion relation between a target station coordinate system and the global coordinate system; through fusion of scanning data of multiple target stations, a global measurement model containing three-dimensional coordinates of complete workpiece feature points is finally constructed. According to the scheme, the technical problem of unification of multi-station coordinates in a large-scale measurement scene is effectively solved, and the detection efficiency of the geometric parameters of the large-scale long-groove workpiece is remarkably improved.

The invention discloses a laser type constructional engineering pipeline diameter measuring instrument and a measuring method, and belongs to the technical field of pipeline diameter measurement. The device comprises two first rectangular pipes, one first rectangular pipe is fixedly connected with a first laser range finder and a mounting block, and the other first rectangular pipe is fixedly connected with a second laser range finder; a first reflector matched with the first laser range finder is fixed on one of the rectangular rods; the method comprises the following steps: S1, holding a U-shaped handle by hand to drive the whole device to move, so that a semi-cylindrical block is propped against the inner wall of a to-be-detected pipeline; the device can measure the inner diameters of various types of pipelines, the inner wall of the pipeline can be measured only by abutting the semi-cylindrical block against the inner wall of the pipeline and extruding the whole device until the rectangular rod abuts against the inner wall of the pipeline, the device does not need to be adjusted, and compared with the prior art, the working efficiency is greatly improved, the measurement difficulty is reduced, and the measurement accuracy is improved. And whether the pipeline is deformed or not can be quickly measured.

The present application belongs to the technical field of optical fiber communication, and particularly relates to a stress measurement method and a stress measurement device. The stress measurement method comprises the steps of preparation, coupling, detection and force application. In the detection step, a detection mechanism measures a first reference value of an optical index when a coupler is formed. In the force application step, at least one taper mechanism releases the clamping of each optical fiber, and one end of a coupling area is fixed. A pulling force is applied to the other end of the coupling area in a direction away from the coupling area, a detection mechanism measures a second reference value of the optical index, the pulling force is gradually increased until the second reference value is substantially equal to the first reference value, and the value of the pulling force at this time is read to obtain the stress of the coupling area. The stress measurement method of the present application can quickly measure the stress of the coupling area.

This application discloses a device and method for measuring the levelness of the internal support ring of a tower pressure vessel. The device includes a laser receiver, comprising: a base secured to the internal support ring; a laser receiving plate including a laser capture display located at its center, which receives laser light and displays a number indicating levelness deviation; and a laser transmitter, comprising: a base secured to the internal support ring; a laser emission source for emitting laser light toward the laser receiver; a first zeroing knob and a second zeroing knob for adjusting the emitted laser light to return the number displayed on the laser capture display of the laser receiver to zero; and a reference fulcrum positioned on the base. The device and its use method can quickly measure the levelness deviation of the internal support ring of a tower pressure vessel with high measurement accuracy and are suitable for measuring the levelness deviation of internal support rings of tower pressure vessels of various sizes.

The invention provides a measurement method and device and a computer readable storage medium, and the method comprises the steps: carrying out the parallel measurement of a measurement object corresponding to a first measurement target MO through a plurality of antenna panels under the condition of meeting the triggering condition of multi-antenna panel measurement. According to the embodiment of the invention, the triggering condition of the multi-antenna panel measurement and / or the quit condition of the multi-antenna panel measurement can be defined, so that the terminal equipment can start / activate the multiple panels to perform parallel measurement in a scene / condition with a rapid measurement requirement, and can start / activate the multiple panels to perform parallel measurement in other scenes / conditions without the rapid measurement requirement. Therefore, the single-sided board can be started / activated for measurement, and the power consumption of the terminal equipment is saved.

The utility model relates to the technical field of aperture detection, in particular to aperture detection equipment. Comprising a handle, a detection seat, a display screen, a controller, a left side detection block and a right side detection block which are symmetrically arranged below the detection seat left and right, and a driving assembly I used for driving the left side detection block and the right side detection block to be close to or far away from each other, the first distance induction sensor is used for measuring the distance between the left side detection block and the right side detection block, the front side detection block and the rear side detection block are symmetrically arranged below the detection base front and back, and the second driving assembly is used for driving the front side detection block and the rear side detection block to be close to each other or away from each other. The second distance induction sensor is used for measuring the distance between the front side detection block and the rear side detection block; according to the utility model, the length of the long axis and the length of the short axis of the elliptical hole can be measured at one time without secondary measurement, the measurement speed is higher, and the aperture detection efficiency of the elliptical hole at the small end of the engine connecting rod is improved.

The invention relates to a broadband continuous testing device and method for diffraction efficiency of a medium-long wave infrared grating. The device comprises a broadband light source, a medium-long wave infrared monochromator, a collimation system, a polarization selection system, a broadband spectrum beam splitting system, a signal enhancement detection system, a sample clamping and multi-dimensional moving system and an automatic control system. According to the testing method, the absolute diffraction efficiency of the grating is tested through double optical paths, measurement errors caused by fluctuation of a light source can be avoided, the measurement errors are further reduced by deducting environmental noise and improving the signal-to-noise ratio through a signal enhancement detection system, an automatic control system is added, and continuous scanning testing in a specified wave band is achieved. The test speed is improved. By means of the device and the method, automatic and rapid measurement of the diffraction efficiency of the medium-long wave echelette grating under the conditions of at least 2.5-14 micron broadband, different wavelengths, any incident angle and dual polarization states can be achieved.

The invention relates to a method for rapidly measuring the resonant frequency of a resonant cavity based on frequency spectrum polynomial fitting, and belongs to the technical field of acoustic / optical measurement. The objective of the invention is to solve the problems of tedious steps, low efficiency, long time, poor stability and the like of a resonant cavity or resonant photoacoustic cavity resonant frequency measurement method. According to the method, the frequency spectrum of the resonant cavity is obtained through frequency mixing excitation, the frequency is obtained after curve fitting is conducted on frequency spectrum data points through a frequency spectrum polynomial fitting algorithm, and then resonant frequency measurement of the resonant cavity is achieved. According to the method, the measurement time of the resonant frequency of the resonant cavity is remarkably shortened, the measurement steps are simplified, and the measurement precision is improved; meanwhile, the resonance frequency is solved through frequency spectrum polynomial fitting, data noise interference can be effectively reduced, and the method has higher robustness. All frequency signals within the resonant frequency drift range are transmitted at a time through frequency mixing excitation, one-by-one scanning is not needed, and therefore the method has the advantages of being good in real-time performance, high in response speed, high in precision and the like, and is suitable for rapid frequency calibration and real-time monitoring in the fields of acoustic resonators, resonant photoacoustic spectra and the like. And a novel method for measuring the resonant frequency is provided for the fields of high-sensitivity resonance photoacoustic spectroscopy, acoustic trace gas detection and the like.

The utility model discloses a rapid measuring device for the diameter at breast height of a tree, which comprises a measuring assembly, the measuring assembly comprises an angle sensor, a lower supporting rod, a gear rod, three gear holes, a rotating shaft, a first rotating cylinder, a second rotating cylinder, a first rotating arm and a second rotating arm, and the gear rod is fixedly connected with the middle part of the outer side wall of the lower supporting rod. According to the utility model, a tested tree is clamped between the first rotating arm and the second rotating arm and is pushed forwards, so that the four positioning wheels are attached to the outer wall of the tested tree at the same time, and meanwhile, the first rotating arm and the second rotating arm are also attached to the outer wall of the tested tree; therefore, the two angle sensors measure angle data of rotation of the first rotating arm and the second rotating arm after attachment to separation, the data processing module automatically calculates the diameter at breast height of the tree according to the angle data and stores a calculation result to the data storage module, two workers do not need to cooperate for measurement, measurement can be completed by one person, manpower is saved, and the measurement efficiency is improved. And the measuring speed is high, and the measuring precision is high.

The invention discloses a three-dimensional reconstruction and pose estimation system and method based on binocular structured light, and the method comprises the steps: obtaining binocular structured light image pairs and attitude angles of a detected part at different preset attitude angles, and synchronously binding the attitude angles with the binocular structured light images; reconstructing dense three-dimensional point clouds of the surface of the measured part in each attitude by utilizing parallax information between binocular images and combining structured light coding and triangulation principles; performing initial pose estimation by using an efficient multi-view algorithm, and performing registration on the dense three-dimensional point cloud under each pose by using a multi-scale geometric constraint ICP algorithm based on an initial pose estimation result and the pose angle to obtain a registered complete point cloud; and geometric completion is carried out on sparse point clouds in the obtained registered complete point clouds through a PCN model, and a global complete three-dimensional point cloud model of the measured part is generated. The method has good precision and robustness in reconstruction of the complex special-shaped part, and the system is light, rapid in deployment and stable in measurement.

The invention discloses a millimeter-wave radar measurement method considering various influence factors, and the method comprises the steps: carrying out the range finding refinement of a millimeter-wave radar, and carrying out the refinement of a range finding value in a precision interval based on a fast Fourier transform method and linear frequency modulation transformation; constructing a distance measurement error fine compensation model, and obtaining an accurate distance measurement value of the radar to the target; according to the distance, the azimuth angle and the pitch angle of the radar and the target after compensation, target coarse positioning is carried out, and a millimeter wave radar high-precision measurement model considering various influence factors is constructed by combining the single observation radar pulse measurement precision difference, the real distance and the signal-to-noise ratio comprehensive fixed weight. And high-precision measurement data of the millimeter wave radar considering various influence factors are obtained. The position of the corner reflector is obtained through spatial distance intersection. The problem of insufficient ranging precision of the millimeter wave radar is solved, the influence of radar electronic element delay, angle and meteorological factors is eliminated, and the rapid measurement of the geometric state of the track is realized by using a precise observation model.

The invention relates to the technical field of surface engineering measurement, in particular to an image-driven super-hydrophobic coating uniformity evaluation method, which comprises the following steps of: firstly, acquiring a color image of a coating to be measured under one-way natural light and vertical imaging conditions, and graying; dividing the image into a plurality of image units according to a preset equidistant rectangular grid; linear gray-depth mapping is obtained through primary illumination calibration of the reference calibration plate, and the gray value of each unit is converted into a surface microstructure depth value; counting an average value and a standard deviation of all depth values, and calculating a variation coefficient to represent overall uniformity; further dispersing the variable coefficient according to a box line-quantile strategy and calculating the Shannon entropy, and verifying the fluctuation distribution balance; the method does not need multiple light sources and contact scanning, has the advantages of simplicity and convenience in operation, rapidness in measurement and full-breadth quantification, and can be used for monitoring the preparation process of the super-hydrophobic coating and inspecting the service quality.

The invention discloses an order difference gap rapid measurement method and device based on visual guidance, and relates to the technical field of modern industrial manufacturing. According to the method, two lasers and two cameras are arranged for order difference gap measurement; the two lasers form a coincident light strip in the space, the coincident light strip irradiates the workpiece gap, and the two cameras shoot light strip images of the workpiece gap respectively; determining a conversion matrix between the two cameras; correcting the conversion matrix between the two cameras to obtain a correction matrix between the two cameras; two light strip images of the gap of the workpiece to be measured are obtained through two lasers and two cameras, so that three-dimensional point clouds corresponding to the gap of the workpiece to be measured under coordinate systems of the two cameras are obtained respectively, and two sets of three-dimensional point clouds under the same coordinate system are obtained through the correction matrix; and according to the two groups of three-dimensional point clouds in the same coordinate system, determining the gap value of the gap of the to-be-measured workpiece. According to the method, the order difference gap can be measured quickly and accurately, and meanwhile, the accuracy of light strip feature extraction is improved.

This invention relates to the field of large target RCS measurement technology, specifically to a two-dimensional fast measurement method for the RCS of large targets in the angular and frequency domains. The method constructs an equally spaced full-sampling measurement matrix P to obtain a sparse matrix R. Based on the sparse matrix R and the full-sampling signal, the target's rotation angle is scanned to obtain the measured value y. Finally, the full-sampling signal is reconstructed based on the measured value y to obtain the target's full-sampling RCS. The rotation-scanning sparse sampling method ensures that the sparse sampling frequency points are the same for each sampling angle, thus improving testing efficiency.