239 results about "Length measurement" patented technology

The invention provides a linear dimension measurement method and device for the total length of a road guardrail stand column, and relates to the field of linear dimension measurement, the device is deployed on a detection vehicle, and comprises a control module, a ground penetrating radar measurement module, a 3D camera measurement module, a sensor module, a lower computer and an upper computer; according to the invention, accurate data acquisition is realized through multi-module cooperative control, and the lower computer is combined with the AI image recognition technology to realize accurate acquisition of contour data; the lower computer transmits radar original data (reflected waves and diffracted waves) and 3D contour data (column cap space coordinates) to the upper computer, the upper computer achieves data fusion through a hierarchical velocity model (time-depth conversion) and a coordinate system mapping algorithm (3D-road coordinate system), and the accuracy of the total length measurement error is greatly improved compared with that of single module detection. The method solves the problems of low efficiency, large destructiveness and poor accuracy of traditional manual detection, and has the advantages of method innovation and engineering landing.

This disclosure extends to systems, apparatus, and methods related to digital tape measure systems including a digital angle-finder, which are able to record and store or transmit to an external device both a length measurement and an angle measurement. These measurements may be able to be recorded individually or together in one “capture” motion, such as pushing a “record” button. Such a system allows a user to easily record a length of material and an angle indicating where and how the material needs to be cut.In some illustrative embodiments, systems in accordance with the present disclosure utilized units of measurement that are displayed by the digital tape measure in a form that can easily be recorded by hand by simple visual reading of the numbers, while simultaneously allowing measurements from the system to be displayed or recorded by the onboard computer.

The invention relates to the technical field of length measurement, and particularly discloses a length measurement device based on laser interference, which comprises a laser measurement module, an air curtain channel module, an air curtain construction module and a channel adjustment module, the laser measuring module is used for transmitting and receiving laser, the optical path difference change is measured according to the interference principle, and the micro length change of the workpiece can be continuously and accurately measured in real time while the machining module carries out machining operation on the workpiece; a linear channel is formed between the laser head and the measuring reflector through the air curtain channel module, inert gas is continuously introduced into the channel through the air curtain construction module, and an air curtain atmosphere with stable laminar flow is formed, so that pollutants and interference factors such as oil mist, dust, cutting fluid splashing and hot air turbulence generated in a machining area are effectively blocked, and the machining precision is improved. Therefore, the measurement light beam is prevented from being interfered by environmental factors in the propagation process.

The invention discloses a stay cable length measurement method based on a three-dimensional laser point cloud, and the method obtains a three-dimensional point cloud model of a stay cable through high-precision laser scanning, and achieves the automatic recognition and precise calculation of the length of the stay cable. The method comprises the following steps: firstly, scanning a stay cable surface of a to-be-measured cable-stayed bridge by using a three-dimensional laser scanner to obtain a point cloud model of a single stay cable; then, segmenting the point cloud model of the stay cable into a plurality of point cloud segments; thirdly, coordinate transformation is carried out on the point cloud cut sections, center coordinates of the point cloud cut sections are calculated, and the cable length of the three-dimensional laser point cloud part is obtained according to the center coordinates of all the point cloud cut sections; and finally, obtaining the anchoring length of the stay cable in the beam body and the tower body according to the design data, and calculating to obtain the cable length of the stay cable, thereby realizing the rapid and efficient measurement of the cable length of the stay cable.

The invention relates to the technical field of atmospheric optical measuring instruments, in particular to an atmospheric coherent length measuring device and a measuring method thereof, and the measuring device comprises a telescope, a focalizer, a primary mirror camera, a star guide mirror, a star guide camera, a PoE power supply communication module, a laser and a computer; the primary mirror camera is connected with the telescope through the focalizer; the focalizer is used for adjusting the focal length of the telescope; the star guide mirror, the PoE power supply communication module and the laser are arranged on the telescope; the star guide camera is connected with the star guide mirror; and the primary mirror camera, the guide star camera, the laser and the computer are all connected with the PoE power supply communication module. The method has the advantages that by adding the focalizer, better and faster focusing work is realized, the telescope obtains clearer fixed star light spot images, and atmospheric coherence length parameters can be calculated more accurately.

A spectroscopic apparatus including an analysis optical system, a length measuring optical system, and a calculation apparatus and performing spectroscopic analysis of a sample, the analysis optical system including a moving mirror having a first reflection surface and a second reflection surface, the moving mirror configured to be translated, a gas cell configured to encapsulate a gas and add a light absorption signal to the analysis light, and a first light receiver configured to receive the analysis light containing a sample derived signal, a first modulation signal, and the light absorption signal, the length measuring optical system including a length measuring optical system configured to acquire a displacement signal corresponding to the position of the moving mirror from laser light reflected off the second reflection surface, the calculation apparatus including a moving mirror position calculator, a light intensity calculator, a Fourier transformer, and a moving mirror position correction section.

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 utility model provides a wire harness fixed-length measuring device, which is applied to the field of wire processing, and is characterized in that a tensioning mechanism is used for tensioning and fixing a to-be-measured wire and detecting the position of one end, far away from a wire core, of a wire sheath of the to-be-measured wire; the breakpoint detection mechanism slides along a fixed electric wire path, triggers an induction signal when reaching a cut-off point of the wire skin and detects position information; and a controller which is in electric signal connection with the tensioning mechanism and the breakpoint detection mechanism and is used for receiving the position information sent by the tensioning mechanism and the breakpoint detection mechanism and calculating the length of the wire skin by combining the two position information. The length measuring device has the technical effects that the length of the wire skin can be measured instead of manual work, and the measuring precision is higher.

The invention discloses a flexible metal material three-dimensional length measurement system based on a rotary camera mechanism, which is used for solving the problems that the existing contact measurement is easy to cause material deformation, the non-contact measurement is poor in adaptability to high-reflection / low-texture materials and the like. Comprising a rotary camera module (an industrial camera collects images at multiple angles along a semicircular guide rail), a visual calibration module (an ArUco code and a photoelectric sensor realize pose calibration and triggering), a texture enhancement module (structured light / random noise projection optimization feature extraction), a three-dimensional reconstruction module (a multi-view three-dimensional reconstruction algorithm generates point cloud) and an error compensation module (an error compensation module). And a material perception weighted least square fitting and neural network dynamic correction error) and a control splicing module. The bending deformation error of the material is eliminated through non-contact three-dimensional measurement; in combination with texture enhancement and error compensation mechanisms, the measurement precision of high-reflection materials such as aluminum foils and stainless steel bands is improved; and a modular integrated design is adopted, and automatic production line deployment is adapted.

The invention relates to the technical field of length measurement and operation control, and provides an automatic length measurement and operation control system for object processing, which acquires length measurement data of an object through a data acquisition module, executes a length calibration mechanism, and ensures that the operation can be accurately performed according to the actual size of the object during each processing; the operation control module controls an operation path and an operation position of target equipment through an operation adjustment strategy according to length measurement data of an object, the object is machined, the machining process of the object is finer and more accurate by controlling the operation path and the operation position, and errors and waste are reduced; and the feedback adjustment module monitors whether the operation position of the target equipment has an error in the object processing process so as to adjust the initial operation path.

The utility model provides a steel rail length measuring instrument, comprising a preset track parallel to a steel rail to be measured; the two sensing assemblies are used for detecting the end point position of the steel rail to be detected; each sensing assembly is in sliding connection with the preset track, and a first fixed distance is formed between the two sensing assemblies before measurement; the fixed laser assembly is used for detecting whether the to-be-detected steel rail is in place; the fixed laser assembly is fixed on the preset track, and the fixed laser assembly is located between the two sensing assemblies; during measurement, the sensing assemblies can move in the first direction or the second direction along the preset track, the first direction is the direction away from the fixed laser assembly, and the second direction is the direction close to the fixed laser assembly. According to the utility model, the endpoint position of the steel rail to be measured is measured through the plurality of sensing assemblies, a manual measurement mode is replaced, and the measurement precision and efficiency can be improved.

The invention provides a municipal bridge crack laser measuring device, which is mainly applied to the technical field of length measurement, and is characterized in that a magnetic conductive plate is arranged below an air bag, the air bag is inflated and expanded, so that the magnetic conductive plate is tightly attached to a bent road surface of a bridge, and a magnet is connected to a rotatable disc in a matched manner; the laser range finder is connected to the rotatable disc, the laser range finder and the magnet are arranged on the same plane, and in the process that the laser range finder and the magnet move along the electromagnetic guide rail, by means of magnetic attraction of the magnet and the magnetic conductive plate, the magnet and the magnetic conductive plate are always kept in a vertical state; and then the laser range finder is driven to always keep a state of being perpendicular to the bent road surface of the bridge in the moving process, so that laser beams emitted from the laser range finder cannot be influenced by bending of the road surface of the bridge, and the accuracy of the device for measuring municipal bridge crack length data is improved to a certain extent.

The invention discloses a multi-path atmospheric coherence length measurement method and system for satellite-ground laser communication. The system is composed of a binocular image acquisition module, a control module, a data processing module and a storage module. The binocular image acquisition module is used for acquiring paired star light spot images, the control module is used for controlling the binocular image acquisition module to effectively acquire, and the data processing module is used for extracting mass centers of star light spots from two frames of synchronously acquired images and calculating atmospheric optical turbulence intensity on a path where the light spots are located by using a differential image motion method; the storage module stores the data result. In the specific measurement method, the detection capability of the measurement system is calculated by adopting a photon flow density method; determining the number of detectable fixed star light spots and the probability thereof according to the size of the field of view of the equipment; realizing estimation of pixel motion and tracking of a star point trajectory by using an optical flow method; the atmospheric coherence length and seeing are calculated according to the mass center motion variance of the fixed star light spot, and the intensity of atmospheric optical turbulence at different positions is revealed.

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.

The utility model belongs to the technical field of measurement, and relates to a pipe bar length measuring device, which comprises a bottom frame, a detection platform and a movable measuring mechanism, the upper end face of the detection platform is provided with an opening groove used for containing a to-be-measured pipe bar in the length direction, the detection platform is further provided with a positioning block capable of moving in the length direction of the detection platform, and the lower end of the positioning block is matched with the opening groove. The positioning block has a locking function and is used for preventing the to-be-measured pipe bar from moving along the length direction of the detection platform; during measurement, through the movement of the positioning block and the measuring mechanism, one end of a to-be-measured pipe bar abuts against the positioning block, and the other end of the to-be-measured pipe bar makes contact with a measuring rod of a dial indicator in the measuring mechanism. The measuring device is simple in structure, the position of the measuring head can be fixed without complex operation by moving the measuring mechanism and the positioning block, and length measurement of pipes and bars of different specifications can be achieved.

The invention relates to the technical field of atmospheric optical measurement, in particular to an atmospheric coherence length measuring device and method with a laser indication function, and the device comprises a telescopic module, a star guiding module, a laser star pointing module, a power supply communication module and a control module. The control module controls the laser star pointing module to carry out laser star pointing through the power supply communication module, so that the star pointing function is convenient to carry out; through laser indication of the laser star pointing module, star finding work can be better carried out, and long-time work can be carried out.

The aim of the invention is to coordinate as much as possible the two actually conflicting targets of high resolution or high image quality and minimum data rate when measuring the length of an object, in view of which the invention proposes a device (1) for determining the length of an object (6) by optical coherence tomography, comprising an interferometer having a light source (2), a sample arm (4) and a reference arm (5), the light emitted by the light source (2) can be split by means of a light splitter (3) such that a first light (4a) can be guided on the sample arm (4) in a reciprocating direction and a second light (5a) can be guided on the reference arm (5) in a reciprocating direction, the first light interfering with the retroreflected second light (4a, 5a), an evaluation unit (8) being provided for detecting and processing a signal of the first light (4a) interfering with the second light (5a), a length switching unit (13a, 13b) is arranged in the beam path of the sample arm (4) and / or in the beam path of the reference arm (5), which length switching unit (13a, 13b) changes the beam path length of the light (4a, 5a) through the length switching unit (13a, 13b), characterized in that at least one length switching unit (13a, 13b) switches the beam path length from a first value to a second value in a time-alternating manner.

The present invention discloses a length measuring device with a support rod, belonging to the technical field of length measurement. The purpose is to provide a length measuring device with a support rod to solve the problem that existing measuring tools cannot accurately measure the length in a narrow space. It includes a housing, on which a locking screw is installed. A locking support rod and a movable support rod are connected to the housing. The movable support rod includes a first measuring handle and a first measuring head, and the locking support rod includes a second measuring handle and a second measuring head. The first measuring head can rotate along the axis of the first measuring handle, and the second measuring head can rotate along the axis of the second measuring handle. A spring reel is installed in the housing, and a wire rope is arranged on the spring reel. A measuring wheel and a guide wheel are installed in the housing. The wire rope winds around the measuring wheel, passes through the guide wheel and then penetrates into the locking support rod and is fixed to the first measuring head of the movable support rod. A reading mechanism is also installed in the housing. The present invention is applicable to length measuring devices.

The invention is suitable for the technical field of wind power generation, and particularly relates to a wind driven generator anomaly detection method and system based on a sensor, and the method comprises the steps: controlling a laser transmitter to transmit detection light rays, receiving reflected light rays, and recognizing the identity of a blade based on the reflected light rays; real-time ranging data is calculated based on the time difference between the emitted light and the reflected light, and the real-time rotating speed of the blade is calculated based on the real-time ranging data and preset parameters of the reflection area; calculating a blade length measurement value based on the distance measurement data pair, constructing a length change curve according to the blade length measurement value, and extracting a blade vibration frequency; and constructing a vibration reference function based on the blade real-time rotating speed and the blade vibration frequency, judging whether the blade is abnormal or not according to the vibration reference function, and generating a judgment result. The accuracy of vibration monitoring is guaranteed through high-frequency sampling, whether the blade is abnormal or not is judged according to the change of the rotating speed and the vibration frequency of the blade, and the stability of detection is guaranteed.

The present invention discloses a medium-thick slab size measurement and verification system and method, which includes a roller table, a slab, a first laser length measurement sensor, a second laser length measurement sensor, a third laser length measurement sensor, a fourth laser length measurement sensor, a fifth laser length measurement sensor, a first grating sensor, a second grating sensor, a third grating sensor and a data processor. The thickness of the slab is obtained by judging the presence or absence of the signal of the grating sensor; the width and length of the slab are calculated through the measured values of the laser length sensors. The system of the present invention has high precision, low investment, convenient installation and low requirements for sensor protection, and can reduce the size quality problems of the finished steel plate caused by the size errors of the billets.

The invention relates to a six-degree-of-freedom measurement precision calibration method for a double-camera photogrammetry system, which can effectively solve the problems of six-degree-of-freedom precision test and calibration of the existing double-camera photogrammetry system, and adopts the technical scheme that the method comprises the following steps of: 1) erecting the double-camera photogrammetry system; 2) calibrating course angle measurement precision; 3) roll angle measurement precision calibration; 4) calibrating the pitch angle measurement precision; 5) calibrating the length measurement precision in three directions; according to the method, the course angle, the pitch angle and the roll angle serve as evaluation indexes of attitude measurement of the double-camera measurement system, the moving lengths in the horizontal direction, the depth direction and the vertical direction serve as the evaluation indexes of attitude measurement of the double-camera measurement system, and the attitude of the double-camera measurement system is evaluated by comparing the difference value between the measured value and the standard value. Therefore, the calibration of the six-degree-of-freedom measurement capability of the double-camera industrial photogrammetry system is realized, and the method is an innovation of a six-degree-of-freedom measurement precision method.

The utility model belongs to the technical field of topographic survey, and particularly relates to a topographic survey device for territorial space planning, which comprises a support assembly, an angle correction assembly arranged on the support assembly, a measurement assembly arranged on the angle correction assembly, and the support assembly is used for supporting the angle correction assembly and the measurement assembly. The angle correcting assembly is used for adjusting the angle of the measuring assembly and enabling the measuring assembly to be located on the vertical plane, and the measuring assembly completes length measurement, height measurement and angle measurement. According to the utility model, through the arrangement of the support assembly, the equipment can be flatly placed on the ground, the height of the angle correction assembly and the height of the measurement assembly can be adjusted, through the arrangement of the angle correction assembly, the measurement assembly can be always kept in a horizontal state, and the precision of a measurement result is greatly improved.

The present invention discloses a high-precision length measurement method and system based on laser technology, including obtaining working data and status data of laser measurement, calculating laser edge coordinates, the first laser measurement length, and ranging scale according to the laser scan data, processing the camera image to obtain pixel edge coordinates, matching the pixel edge coordinates and the laser edge coordinates to obtain the first edge coordinates, fusing the first edge coordinates and the second laser measurement length to obtain the laser image length, constructing a high-precision length measurement model according to the comprehensive measurement length, the ranging scale, the transmission influence factor, and the first edge coordinates, and inputting the working data and status data to be measured into the high-precision length measurement model to obtain the measurement length. This method can not only improve the accuracy of laser length measurement, but also has good interpretability, and can be directly applied to a high-precision length measurement system based on laser technology.

The invention discloses a profile steel tongue cutting automatic positioning method which comprises the following steps: when the head of profile steel reaches a first detection point, a control system receives a deceleration signal and then controls the profile steel to decelerate, so that the profile steel reaches a preset position of a laser length measurement system; the laser length measuring system photographs the tongue part of the profile steel head to obtain profile steel head image data, the data processing system calculates length data of the head tongue, when the profile steel head reaches a second detection point, the laser length measuring system stops photographing the tongue part of the profile steel head, and when the profile steel head reaches a third detection point, the laser length measuring system stops photographing the tongue part of the profile steel head. Controlling the profile steel to decelerate so that the profile steel just reaches the position of a baffle plate, calculating the required moving distance of the moving saw after the profile steel stops moving, and controlling the moving saw to automatically move to the position of a cutting line to perform tongue cutting operation; after profile steel head tongue cutting is completed, the baffle automatically descends, the conveying roller way is automatically started, and the head sawing process is finished; automatic positioning in the profile steel tongue cutting process is achieved, and the requirement for manual operation is reduced.

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.