80 results about "Length measurement" patented technology

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.

An optical device includes: an incident optical system; an analysis optical system; and a length measurement optical system. The incident optical system includes a laser light source, and an incident light dividing element that divides the laser light. The analysis optical system includes a first light dividing element that divides the first divided light and then mixes the light, a first mirror that adds a first modulation signal to the one first divided light by movement and reflection, a second mirror, and a first light receiving element that receives the first divided light including a sample-derived signal and the first modulation signal. The length measurement optical system includes a second light dividing element that divides the second divided light and then mixes the light, an optical feedback unit that feeds back the one second divided light to the second light dividing element, and a second light receiving element that receives the second divided light including a displacement signal generated by the first mirror.

A spectroscopic device includes: an analysis optical system; a length measurement optical system; and a calculation device. The analysis optical system includes a moving mirror and a first light receiving element. The length measurement optical system includes a second light source configured to emit laser light, a gas cell with a gas that absorbs light of a predetermined wavelength sealed therein and configured to cause the laser light to be incident thereon, an emitted light amount detection unit configured to detect an amount of light emitted from the gas cell and output an emitted light amount detection signal, a light source control unit configured to control a wavelength of the laser light based on the emitted light amount detection signal, and a length measurement unit configured to use the laser light to obtain a displacement signal corresponding to a position of the moving mirror, and the calculation device includes a moving mirror position calculation unit, a light intensity calculation unit, and a Fourier transform unit configured to generate a spectral pattern.

The invention relates to the technical field of machine vision, and particularly discloses a length measurement method and system based on machine vision, and the method comprises the steps: collecting the geometric data of a sequence image recognition clamp to form a geometric constraint set, and extracting the candidate edge of the end part of a pole piece; executing constraint deformation regression based on the geometric constraint set to obtain time-varying distortion mapping and generate a geometric correction image; triggering a focal plane perturbation to collect an auxiliary image, calculating a parallax field, solving a local scale factor, and generating a mapping relation from pixels to actual lengths; executing sub-pixel edge fitting in the geometric correction image to obtain pole piece endpoint coordinates; calculating the extension amount of the measured pole piece; according to the method, time-varying distortion is eliminated through online correction of geometric drive of the clamp, depth-related scale change is compensated by using active focal plane perturbation, and the precision problem of length measurement in a cross-medium environment is effectively solved by combining sub-pixel positioning and time sequence processing, and extra calibration equipment is not needed.

The invention relates to the technical field of ship maintenance and nondestructive testing, in particular to a crack length measuring device. A crack length measuring device comprises a shell and a photoelectric measuring part arranged at the bottom end of the shell, a power source is arranged in the shell, and the shell is further provided with a display part used for receiving signals of the photoelectric measuring part and displaying the signals in the form of length signals. The photoelectric measuring part comprises a measuring wheel, a light grid is arranged on the side portion of the measuring wheel, and the photoelectric measuring part further comprises a photoelectric sensor for sensing the light grid. The rotation angle of the measuring wheel can be obtained only by detecting the number of the light grids sequentially passed by the photoelectric sensor, and the path of the measuring wheel, namely the length of the crack, can be obtained according to the diameter and the rotation angle of the measuring wheel, namely, the length of the irregular crack can be measured through a simple structure, and the measurement accuracy is improved. The problems that in the prior art, the measurement error is large when a ruler is adopted for cracks of irregular curves, and the cost is high when high-precision electronic equipment is adopted are solved.

A distance measuring device includes a measuring member holding a length measuring instrument and at least one rail member (base member) on which the measuring member is movably disposed. When a straight line parallel to a direction in which the measuring member disposed on the base member moves is defined as a reference line, an angle formed by a straight line parallel to an axial length direction of a reaction tube and the reference line, which are on an identical plane, is constant for the plurality of reaction tubes disposed side by side along the reference line. A measurement direction of the length measuring instrument is parallel to the axial length direction of the reaction tube in a state where the measuring member is disposed on the base member. The measuring member is disposed on the base member to be able to sequentially move.

The application relates to a laser tracker mirror surface foldover length measurement optical path fast adjusting device and adjusting method. The adjusting device comprises a laser transmitter with a circular arc surface, a spherical diaphragm and a four-degree-of-freedom adjusting frame. The laser transmitter is located at one end point of a measured length and is used for transmitting a laser beam. The spherical diaphragm is located at another end point of the measured length and is used for limiting the laser beam so that the laser beam is parallel to the measured length. The four-degree-of-freedom adjusting mirror frame is located on the extension line of the measured length and is close to the spherical diaphragm, is used for mounting a plane mirror and adjusting the position and posture of the plane mirror, and makes the laser beam pass through the original point of the laser tracker after being reflected by the plane mirror. The adjusting method is to realize optical path fast rough adjustment through reproducing the optical path of the laser tracker mirror surface foldover length measurement and to realize optical path quantitative fine adjustment through calculation.

This invention provides a precise method for measuring the shrinkage of prestressed anchor cables using a through-hole jack tensioning system, belonging to the field of prestressed anchoring engineering technology. The method involves setting fixed marks m and n on the exposed steel strands of the tool anchor plate and working anchor plate, respectively. Using a high-precision length measuring instrument, the corresponding characteristic length data are precisely measured in three tensioning stages: before the installation of the through-hole jack after anchor cable pre-tensioning, after tensioning to the final stage and stabilizing, and after unloading and disassembling the through-hole jack. The shrinkage of the tool anchor plate, the actual elongation of the steel strand, and the shrinkage of the working anchor plate are then calculated using correlation formulas. This invention solves the problems of traditional measurement methods, such as inconsistent measurement points, susceptibility to the condition of the steel strand ends, and incompatibility with high-precision measuring instruments. It also eliminates the unreasonable method of using the groove depth of the limiting plate as a fixed parameter, considers the actual working conditions of the anchor clamp and steel strand matching, and significantly improves the accuracy of shrinkage measurement.

The present application provides a computer program, an information processing method and an information processing device capable of assisting in detection processing related to a prescribed pattern formed on a substrate. The computer program causes a computer to perform detection processing related to a plurality of patterns of a prescribed shape formed on a substrate on one or more captured images obtained by capturing the substrate after being processed by a substrate processing device, and to perform processing of detecting an image area in which an existing pattern is reflected from the captured images, detecting the outline of the pattern in the image area, and detecting a length measurement site for the pattern based on the detection result of the outline. In at least one of the detection processing of the image area, the detection processing of the outline, and the detection processing of the length measurement site, condition information including at least one of coordinate designation, area designation, or text as a detection condition is acquired, and the detection processing related to other patterns is performed based on the condition information acquired with respect to one pattern.

A method for calibrating or characterizing a coordinate positioning machine (1) having a first member (3) movable relative to a second member (2) is disclosed. One or more length measurement devices (51) are coupled in a plurality of different configurations between at least one support (34) attached to the first member (3) and a plurality of supports (24) attached to the second member (2) via a base plate (22). For each of the plurality of different configurations, the machine (1) is controlled to move the first member relative to the second member and collect calibration data. The geometry of the machine (1) is characterized by a set of model parameters, and the calibration data is used to determine a better estimate of at least one model parameter.

The application provides a kind of underwater fish length measurement method based on binocular vision and attitude estimation, belongs to image recognition and underwater measurement technical field.The method constructs a new type of cascaded perception measurement framework combined with underwater context attention enhancement module and geometric statistical filtering engine;The framework is based on a top-down target detection and key point positioning cascaded network, introduces an underwater context attention enhancement module at the key point feature fusion end, and introduces a spatial orthogonal circular arc compensation and double-stage time signal filtering mechanism at the three-dimensional object understanding algorithm end, through the collaborative optimization of visual feature topology perception and space-time joint filtering, realizes the accurate capture of fish key points under light and shadow interference, and effectively suppresses the non-rigid swimming deformation and depth noise jump, effectively solves the distortion problem of underwater dynamic length measurement, significantly improves the anti-distortion ability and overall output stability of measurement in underwater dynamic environment.

The utility model aims to provide bamboo batten kicking equipment, which belongs to the field of forestry machinery and is characterized in that the bamboo batten kicking equipment comprises a rack, a length measuring assembly, a detection assembly, a first conveying assembly, a second conveying assembly and a kicking assembly, the length measuring assembly comprises a mounting plate, a guide groove, a first pressing mechanism, an encoder, a roller and a feeding sensor, the detection assembly comprises a first camera, a first light source, a first nozzle, a second camera, a second light source and a second nozzle, the first conveying assembly comprises a motor, a first driving wheel, a first driven wheel, a second pressing mechanism and a discharging sensor, and the second conveying assembly comprises a second driving wheel, a second driven wheel and a third pressing mechanism. The material kicking assembly comprises a material kicking mechanism and a guide plate. According to the device, bamboo battens enter the device from the length measuring assembly, when the bamboo battens pass through the detection assembly, a camera begins to photograph and detect, if the detection result is that the bamboo battens are good, the bamboo battens are continuously conveyed forwards through the first conveying assembly and the second conveying assembly, and if the detection result is that the bamboo battens are defective, the material kicking assembly works to remove the bamboo battens.

This invention relates to the field of rebar length measurement, and more particularly to a high-precision length measurement method and system for continuously cast rebar billets. The method includes the following steps: installing an industrial-grade infrared camera system above the output roller conveyor of the production line to continuously acquire images and obtain a raw image stream; preprocessing the raw image stream to obtain an enhanced image stream; determining the end position of the billet based on the enhanced image stream; performing pixel displacement conversion calculation based on the end position of the billet to obtain the real-time length value of the billet; correcting the image measurement motion error of the real-time length value to generate a corrected length value; extracting the target length measurement, and performing real-time rolling tracking of the corrected length value; when the target length measurement is detected to be equal to the standard length measurement, driving the cutting equipment to complete the length measurement. This invention achieves high-precision length measurement and measurement of continuously cast rebar billets, improving the accuracy of length measurement and cutting and increasing production efficiency.

This utility model discloses a ground fissure monitoring device, belonging to the technical field of geological exploration equipment. The device includes a first anchor rod, a second anchor rod, a measuring instrument, and a measuring rope. The measuring instrument has a measuring slide, a length measuring scale, a first opening, and a second opening extending into the measuring slide on its outer wall. A measuring slider slides within the measuring slide, and the measuring slider contains a damping element. A measuring pointer is mounted on the measuring slider, extending from the first opening and pointing towards the length measuring scale. The measuring instrument can be fixed to the second anchor rod. One end of the measuring rope connects to the first anchor rod, and the other end passes through the second opening into the measuring slide and connects to the measuring slider. The second anchor rod has a first guide wheel and a second guide wheel, and the measuring instrument has a third guide wheel and a fourth guide wheel. According to this design, geological surveyors only need to periodically read the sliding distance of the measuring slider to directly obtain data on ground fissure changes.

The utility model provides an absolute grating ruler and a length measuring device, and relates to the technical field of optical measurement, the absolute grating ruler comprises a main ruler used in cooperation with a code reader, the code reader moves in the length measuring direction of the main ruler, and the main ruler comprises a plurality of sub-rulers which are arranged in the displacement direction of the code reader at intervals; the auxiliary scale is arranged along the displacement direction of the code reader, the auxiliary scale is provided with at least one first absolute code channel used for positioning the position of a sub-scale corresponding to the code reader, and each sub-scale is provided with at least one incremental code channel used for reflecting the movement distance of the code reader on the sub-scale; and the code reader is used for reading the position of the corresponding sub-scale and the measured moving distance so as to obtain a length measurement result. And the first absolute code channel and the incremental code channel are combined to obtain a high-precision measurement length. And a plurality of sub-scales which are spliced at intervals are adopted, so that the mounting requirement and the requirement on the use environment are reduced, and batch production is facilitated.

This invention relates to the field of stepped hole measurement technology, and in particular to a precision internal step gauge. It mainly includes a dial indicator, an internal step gauge body, a support nut, a support spring, a support screw, and an internal groove probe. This invention primarily utilizes a lever to convert linear movement into pointer rotation, and then uses a scale dial for reading the length measurement instrument. Compared to previous profilometers and three-dimensional coordinate measuring machines, this invention allows for online step measurement, offering convenience, flexibility, and high fabricationability.

The invention provides a measurement precision transformation and improvement system of a measurement instrument and a use method of the system, and relates to the technical field of measurement. The measuring instrument is arranged in the packaging shell, is a length measuring instrument or a force measuring instrument, and comprises an instrument body and a contact part capable of linearly stretching and retracting relative to the instrument body; the distance conversion assembly is connected to the packaging shell and comprises an access part which is connected to the contact part and can linearly move along the same direction with the contact part; the output part extends from the inside to the outside of the packaging shell and is used for being connected to an object to be measured; and two ends of the switching mechanism are respectively connected to the access part and the output part, and the switching mechanism is used for switching the moving distances of the access part and the output part according to a set proportion. The improved lifting system is simple in structure, measurement exceeding the measurement precision of the measuring instrument can be completed, and the improved lifting system ultimately improves the measurement precision.

The invention discloses a vertical laser interference comparison length measuring method and device, and the method comprises the steps: monitoring the position of a positioning measuring head in real time to obtain monitoring data, placing a measuring block on a workbench, enabling the positioning measuring head to be in contact with the surface of a measured block, and enabling the measuring head to emit a positioning signal when the contact force of the positioning measuring head reaches a set force value; the measuring head is driven to move up and down, z-direction movement is controlled by adopting a positioning signal of the measuring head during positioning, a measured block is pushed in and pushed out, and the measuring block is positioned to different measuring positions; length measurement data are obtained through instrument control and automatic measurement based on a comparison method measurement principle; and performing environmental error dynamic compensation on the length measurement data to obtain length measurement correction data, and performing data fusion on the length measurement correction data according to the measurement position to obtain a length measurement result. The method not only can improve the precision of vertical laser interference comparison length measurement, but also has good interpretability, and can be directly applied to a vertical laser interference comparison length measurement system.

The utility model belongs to concrete crack detection technical field, and disclose concrete crack detection marking surveying and mapping ruler, including the upper end surface fixed of surveying and mapping ruler body is equipped with length sensor, the lower extreme of length sensor is equipped with inner groove, and surveying and mapping ruler body is fixed in inner groove inside, the upper end surface middle fixed of length sensor is equipped with length display screen, the both sides of length sensor's upper end surface are all fixedly installed and are equipped with adjusting device, through length sensor, length display screen and inner groove, utilize them can connect surveying and mapping ruler to length sensor, by length sensor control surveying and mapping ruler carries out length measurement, can improve concrete crack measurement precision, realize real -time, automatic monitoring and remote data transmission, also convenient data record analysis, can timely capture crack dynamic change, provide strong basis for structure safety evaluation and maintenance decision, reduce artificial error and workload.

The utility model relates to the technical field of measuring devices, in particular to a track bending radius measuring device, which comprises a standard distance measuring rod with the length of meter and used as a chord length measuring reference of two points; the detection device is vertically arranged on the center line of the standard distance measuring rod and is used for measuring the distance between the center of the guide rod and the inner side of the bent rail; the folding type extension handle is connected with the standard distance measuring rod through a 90-degree resistance hinge, forms a perpendicularity angle with the detection device during installation and is used for achieving single-person and single-hand measurement, and the track bending radius measuring device is convenient and efficient in measurement, safe, reliable, wide in application range, simple in structure, low in cost and suitable for popularization and application. The service life of equipment can be prolonged; and the transportation safety is improved.

This invention relates to the field of intelligent sensing and measurement technology, specifically to an industrial-grade transmitting component, industrial measuring device, and measurement method based on intelligent sensing. The device includes an intelligent measuring instrument, a wireless sensing relay receiver, an image display, an operating table, a support frame, and a switching switch. The support frame is mounted on the operating table, and the switching switch is mounted on the support frame. A drive mechanism is mounted on the support frame, and the intelligent measuring instrument is connected to the drive mechanism. An instantaneous yaw mechanism is mounted on the support frame, cooperating with both the drive mechanism and the switching switch. This invention achieves full-process automation of "one-time completion, automatic track changing, and return retesting," enabling multi-reference composite measurement to be completed within a single work cycle without manual intervention. This significantly improves the efficiency and reliability of length measurement for large batches of workpieces in industrial settings and reduces misjudgments and rework rates caused by a single reference.

The invention relates to the technical field of phasor measurement, in particular to a broadband phasor self-adaptive variable window length measurement method and device for a power system, and the method comprises the steps: collecting a sampling signal of a target power system, responding to a non-power-frequency oscillation component in the sampling signal, determining the time window length of interpolation calculation, and calculating the time window length of the target power system according to the time window length. And calculating a phasor estimation value of each frequency component according to the signal data of the time window length, generating candidate oscillation modes, taking the frequency of at least one candidate oscillation mode as an index, querying a certain frequency-window length corresponding relation, determining the corresponding shortest time window length, and outputting a broadband phasor measurement result. Therefore, the problem that effective balance of measurement precision, calculation complexity and response speed is difficult to realize in practical engineering application due to the fact that the frequency band application range is narrow or the calculation complexity is high in the prior art is solved.

The invention relates to a binocular stereoscopic vision length measurement method for a cylindrical workpiece capable of resisting surface texture interference. The method comprises the following steps: acquiring a workpiece contour and a point set; binocular geometric axis fixing is carried out; positioning a radius-constrained end face: counting and estimating a cylinder radius based on a vertical distance from a side wall three-dimensional point to an axis obtained by side wall long edge reconstruction; selecting pixel points on an end face visible arc in at least one view, and back-projecting the pixel points into a space ray by using internal reference of the camera; establishing an intersection equation of the space ray and the outer surface of the cylinder by taking the estimated radius of the cylinder as a geometric constraint to obtain coordinates of an intersection point; axial projection and robust length measurement and calculation: projecting the intersection point to the central axis of the cylinder to obtain an axial scalar and form an axial scalar set; and determining end face positions at two ends by adopting a robust statistical method, and further calculating the length of the workpiece.

The invention relates to the technical field of industrial nondestructive testing and precision measurement, in particular to a PCB back drilling hole stub length measuring method based on circumference computer layered imaging, which comprises the following steps: S1, acquiring RCL three-dimensional body data based on a circumference calculation layered imaging technology; s2, positioning a back drilling hole and determining an annular sampling area from the RCL three-dimensional body data; s3, carrying out gray scale statistics layer by layer in the annular sampling area along the thickness direction of the PCB, and generating a gray scale curve; s4, analyzing feature points of the curve, and determining a first feature position corresponding to a signal line layer and a second feature position corresponding to a stump tail end layer; and S5, according to the first feature position and the second feature position, the stub length of the back drilling hole is obtained through calculation. According to the method, the negative influence of aliasing artifacts generated by limited angle scanning on the measurement precision of the length of the stub of the back drilling hole is overcome, and high-precision, high-efficiency and non-destructive stub length measurement is realized.

The utility model relates to the technical field of decoration engineering measuring equipment, and discloses a measuring device for decoration engineering, which comprises an adjustable bearing assembly and a measuring assembly arranged above the bearing assembly, the bearing assembly comprises a bearing disc and a placing groove arranged on the upper surface of the bearing disc, the measuring assembly is arranged in the placing groove, and the measuring assembly is arranged above the bearing disc. The measuring assembly is formed by hinging a handheld first shell and a handheld second shell. According to the measuring device for the decoration engineering, short-distance length measurement can be completed through the measuring tape, long-distance length measurement can be completed through the laser range finder, multiple functions such as length measurement, angle measurement and horizontal measurement are integrated in one measuring device, operation is more convenient, the working efficiency is improved, and the practicability is high. The laser ranging module and the electronic angle measuring module improve the accuracy and precision of measurement, and the leveling operation before the levelness measurement can also ensure the reliability of levelness measurement, so that the effects of diversified functions, accuracy and convenience are achieved.

The present application discloses a measurement device, which is used for measuring the length of insulating paper exposed out of an end portion of a roll core, and comprises: a main body and at least one measurement structure provided on the main body, wherein the measurement structure comprises a positioning member and a length measurement member; the positioning member is configured to extend into a central hole of the roll core; and the length measurement member is used for measuring the length of the insulating paper exposed out of the roll core.

The invention relates to the field of length measurement, in particular to a track distance measuring method and a track distance measuring device. The method comprises the following steps: installing a laser range finder to one end of a track, installing a reflection target to the other end, obtaining measurement data and calibration light spot position data, generating calculation data according to a preset calculation method, generating identification data according to related data, associating the identification data to a label, and installing the label to the track. Obtaining rail type data and storing the calculation data and the rail type data; the track distance measuring device comprises a laser distance measuring instrument, a reflection target, an acquisition module, a processing module, a printer, a label and the like, the laser distance measuring instrument is provided with a calibration light source and a measurement light source, the reflection target is provided with a reflection identification area and a reflection area, and the device is further provided with a mounting base and a magnetic block. The track distance measuring device achieves the technical effects that the track distance is accurately measured, track information is conveniently recorded and managed, and the device is convenient to install and use.

This application provides a laser real-time ranging system for intelligent fixed-length cutting of steel pipes, belonging to the technical field of steel pipe processing equipment. The system includes an industrial infrared camera, an industrial control computer, a ranging sensor, and a PLC control system. The industrial infrared camera is mounted on a camera-carrying trolley that can move along the length of the steel pipe. This trolley is installed on a support built above the roller conveyor and can move along the length of the steel pipe to drive the industrial infrared camera to acquire images of the beginning and end faces of the steel pipe. The ranging sensor is fixed to the tail of the support and is used to measure the position of the camera-carrying trolley in real time. The industrial control computer receives the ranging data and visual image data and performs fusion calculations to determine the actual length of the steel pipe. The PLC control system is connected to the industrial control computer and is used to receive the length data and control the cutting equipment to adjust the cutting trigger position. This application can improve the accuracy of steel pipe length measurement.

[Problem] To provide a length measuring device capable of reliably holding a workpiece in a desired posture and measuring the length thereof, even if the workpiece has a shape that easily rolls about the longitudinal axis thereof.　[Solution] A length measuring device 1 for measuring the length of a workpiece to be cut by a cutting device 9 comprises: a slide rail 13 fixed relative to the cutting device 9 during length measurement; and a slide part 20 slidably installed on the slide rail 13, the slide part 20 having a slide body 21, a length measuring instrument 60 for measuring the slide distance of the slide body 21 with respect to the slide rail 13, and a workpiece abutting member 30 having a length measurement reference surface that abuts a workpiece 8 installed at a cutting position, as a reference surface during length measurement. The workpiece abutting member 30 comprises a workpiece jig member 40 installed at the tip thereof, the workpiece jig member 40 having a workpiece abutting guide 50 in which a workpiece clamping groove 55 for clamping the end of the workpiece 8 is formed when the end is an inclined surface.

This invention provides a fiber optic laser length measurement system, comprising: a linearly swept laser, a first fiber coupler, a signal amplification module, a circulator, a second fiber coupler, a photodetector, and the fiber laser under test. The linearly swept laser outputs continuously varying laser light to the first fiber coupler. The first fiber coupler splits the laser light output from the linearly swept laser into two paths according to a certain beam splitting ratio; one path is transmitted as a signal light to the signal amplification module, and the other path is transmitted as a reference light to the second fiber coupler. The signal amplification module amplifies the signal light and outputs it to the circulator. This invention effectively solves the problems of low signal-to-noise ratio, poor accuracy, and poor stability in the prior art when measuring the fiber length of fiber lasers.