1107results about How to "Improve measurement efficiency" patented technology

The invention relates to a method for measuring circular tunnel convergence deformation. The method includes the steps of S1, by a three-dimensional laser scanner, acquiring the working base point coordinates and tunnel point cloud of each observation station; S2, using working base points as splicing datum points to merge the tunnel point cloud into a unified reference coordinate system, and segmenting into point cloud of a multi-ring pipe joint according to the pipe joint; S3, fitting the point cloud of a single-ring pipe joint into a cylindrical face according to an improved cylindrical face fitting algorithm, extracting pipe joint axis point coordinates, projecting the cylindrical face to a plane along the axis direction of the pipe joint to obtain a two-dimensional tunnel point cloud contour line, and fitting into an ellipse according to an ellipse fitting algorithm; S4, expanding the ellipse into a three-dimensional elliptic cylindrical surface along the axis so as to obtain the three-dimensional convergence deformation of a whole tunnel. Compared with the prior art, the method has the advantages that the longitudinal axis and convergence deformation of the tunnel under construction and the tunnel under operation can be acquired, monitoring point laying is not needed, high measuring efficiency is achieved, and comprehensive monitoring data is provided to tunnel construction and operation.

A method and its system of monitoring performance of internal is first to determine the emitting point of a test packet and place send/receive devices of the test packet at the point to determine a batch of reflecting points of test packet according to the monitored network sphere, performance parameters and prepare conditions for three reflecting points. The test packet send/receive device send test packets with different measurement forms to the reflection points at the emitting point by selecting a strategy of different opportunities. There reflecting points have the characters of reflecting different measurement packets autoamtically and the tested information reflected is sent back to the emitting points. Which extract and related test parameters to be stored after coherent process.

The invention discloses a three-dimensional speckle strain measurement method, comprising: (1) speckle preparation; (2) camera calibration; (3) state information acquisition; (4) computational domaindesignation; (5) initial point setting; (6) speckle matching; (7) three-dimensional reconstruction; and (8) strain computation. By the above operation steps, the invention provides a three-dimensionalspeckle strain measurement method, which can effectively obtain high preciseness measurement results in measurements of material characteristic parameters such as full-field vibration measurement, dynamic strain measurement, high speed deformation measurement, fracture mechanics, impact excitation and dynamic material experiments. The invention has the characteristics of convenient measurement operation, high automation degree, exact and reliable results, high efficiency and non-contact measurement.

The invention discloses a road foundation layered vertical settlement and transversal displacement automatic monitoring device and a monitoring method thereof in the technical field of optical measurement. The invention adopts a technical proposal that the automatic monitoring device comprises a measuring and positioning unit, a laser displacement sensing unit, a laser angle sensing unit, a measuring signal control unit, a measuring data transmission unit, a central processing unit and a power module; and the automatic monitoring method comprises: firstly, assembling various devices; secondly, starting a pulling device, stopping the device when a positioning sensor arrives at a position of a magnetic ring, measuring displacement data and angle data, and transmitting the data to the central processing unit for storage; thirdly, restarting the pulling device, and repeatedly measuring and saving the data until a measuring tube contacts a limit switch; and processing all the data of the central processing unit, and obtaining road foundation vertical settlement and transversal displacement parameters. The automatic monitoring device and the automatic monitoring method apply laser measurement technology, improve the measurement precision and the measurement depth, and simultaneously realize remote automatic monitoring.

The invention discloses a vision extensometer implementation method based on digital speckles. The method includes the first step of speckle and mark making, the second step of binocular camera calibration, the third step of speckle image acquisition, the fourth step of image subarea specifying, the fifth step of image correlation matching, the sixth step of three-dimensional coordinate reconstruction and the seventh step of deformation calculation. Through the operating steps, the vision extensometer implementation method based on the digital speckles can be used for accurately measuring the deformation of materials in the tensile experiment process and has the advantages of being convenient to operate, capable of achieving non-contact measurement, accurate and reliable in measuring result and the like.

The invention discloses a system for measuring an inner diameter of a tubular workpiece. The system comprises a crawling transportation positioning sub-system, a data acquisition and control sub-system and a data processing sub-system, wherein when the inner diameter of a measured tubular workpiece is required to be measured, the crawling transportation positioning sub-system crawls in a pipeline of the measured tubular workpiece under the control of the data acquisition and control sub-system, and acquires measurement data of a pipeline section corresponding to a position to be measured when crawling to every position to be measured; the data acquisition and control sub-system acquires the measurement data which is acquired by the crawling transportation positioning sub-system and sends the measurement data to the data processing sub-system; and the data processing sub-system generates a required measurement result according to the received measurement data. By the adoption of the system for measuring the inner diameter of the tubular workpiece, the accuracy of a measurement result is improved, and the measurement efficiency can be improved.

The invention discloses an ortho-image generation method based on a three-dimensional laser point cloud. The ortho-image generation method comprises the steps of obtaining a target three-dimensional point cloud; preprocessing the target three-dimensional point cloud to generate a point cloud to be projected; segmenting the to-be-projected point cloud, and reserving a to-be-projected target; defining a projection plane and a projection density parameter; with the projection plane as a reference, calculating projection coordinates of the current point cloud scatter point to an orthographic planein sequence; calculating a projection boundary of the point cloud orthographic image; calculating image coordinates of each projection point according to the projection boundary; and generating an orthoimage according to the image coordinates. According to the method, a rapid structure chart or a corresponding orthographic projection image can be obtained, measurement is carried out on the basisof the projection image, and the point cloud measurement efficiency can be greatly improved. The engineering practice precision requirement can be met, and a certain guiding and reference effect is provided for ancient building protection.

The invention discloses a horizontal arm type three-coordinate measuring and ruling machine, which includes a base, an upright column and a horizontal arm, wherein the upright column and the horizontal arm are made of lighter material, namely aluminum; all three shafts adopt two sets of linear slides; and the linear slide of the horizontal arm is mounted by adopting two mutually vertical surfaces, and an adjustable pull rod is mounted in the horizontal arm for adjusting the curve and deformation caused by other causes as self weight. The horizontal arm type three-coordinate measuring and ruling machine solves the problems in the market that the existing three-coordinate ruling machine has unstable mechanism, complex structure and high cost, and is complex to machine the parts and inflexible to operate. The shafts are mutually vertical and matched with the precise linear slides to realize the three-dimensional movement, so as to achieve the measuring and ruling functions in the three-dimensional space; and the three-coordinate measuring and ruling machine can support all sorts of triggering, analog scanning and non-contact optical measuring heads, and can be widely applied to the measuring and ruling of large mechanical parts as automobiles, motorcycles, excavators, ship engines and dies.

The invention relates to a rapid width measurement system for tobacco shreds, which is mainly composed of an image filtering and region segmentation unit, a subimage contour extraction unit and a single tobacco shred width calculation unit. By using the advanced computer technology, image recognition technology and real-time digital image processing technology, the invention can realize the rapidand accurate width measurement of a large number of tobacco shreds. By using the invention, multiple tobacco shreds can be measured in one step, and the average width and variability of each tobacco shred can be rapidly and accurately calculated. The invention has the characteristics of simplified equipment structure, accurate width measurement of tobacco shreds and high measurement efficiency.

The invention discloses an on-machine detection measuring head for a numerical control machine tool. The on-machine detection measuring head comprises a measuring bar and a guide mechanism for guiding the measuring bar to make the vertical linear motion. The top of the measuring bar is provided with an elastic reset mechanism. The on-machine detection measuring head is characterized in that a linear displacement sensor is arranged at the position close to the measuring bar. The invention also discloses a detection system applying the measuring head, and the detection system comprises the measuring head, a signal acquisition circuit and a control center which are sequentially electrically connected. A numerical control system executes a measuring program to control a servo system of the machine tool to drive the measuring head to carry out measurement; coordinates of a point which is measured each time are timely transmitted back to the detection system; after the model detection is completed, the detection system carries out error compensation on measurement data; a spatial position and shape information of a measured workpiece can be calculated by carrying out corresponding operation on the corrected data; and the positioning and processing correction of the workpiece are guided by utilizing an obtained result. Auxiliary processing time can be greatly saved and the rejection rate of the workpiece is reduced.

The invention relates to a robot self-calibration method based on plane constraint and vision-assisted positioning. The robot self-calibration method based on plane constraint and vision-assisted positioning is used for obtaining real connection rod parameters of a robot. Firstly, a robot kinematic model combining a D-H method and a MD-H method is established; secondly, a robot terminal position error model is established; thirdly, a robot connection rod parameter error model based on plane constraint is established; fourthly, images, of a constraint plane, in a left camera and a right camera are obtained through binocular vision, target point information in each image is extracted, the three-dimensional position information of the constraint plane under a basic coordinate system of the robot is positioned through three-dimensional matching; the position information is input into a robot control system, and the robot is driven to measure the constraint plane; and finally the measured data are substitute into the plane constraint error model, the real geometric connection rod parameters of the robot are recognized, and after correction, measurement of the constraint plane and recognition are repeatedly conducted until a precision requirement is met. The robot self-calibration method based on plane constraint and vision-assisted positioning has the advantages of being low in cost and high in precision and efficiency.

The embodiment of the invention provides a three-dimensional laser scanning measurement method and a three-dimensional laser scanning measurement device. The method mainly comprises the following steps of: measuring the distance between each measurement point in a neighboring region of an initial measurement point and a rotary measurement head of a three-dimensional laser scanner respectively, calculating a next angle increment of the rotary measurement head by a set algorithm according to the distance between the each measurement point and the rotary measurement head of the three-dimensional laser scanner, obtaining a next measurement point according to the angle increment, and measuring the distance between each measurement point in the neighboring region of the next measurement point and the rotary measurement head of the three-dimensional laser scanner respectively. The method and the device can realize dynamic adjustment of the angle increment of the three-dimensional laser scanner when implementing scanning on the surface of a measured object, further realize equal resolution scanning on the surface of the measurement object, and improve the measurement efficiency and spatial measurement precision of the three-dimensional laser scanner.

The invention provides a large gear measurement method based on an articulated arm measurement machine, belonging to the technical field of gear measurement. An articulated arm coordinate measurement machine is arranged beside a machine tool to perform field measurement on a machined gear on the machine tool; through the articulated arm coordinate measurement machine, a position relationship between a measured gear workpiece and a measurement instrument can be established; after a probe of the measurement instrument is adopted to uniformly sample on the gear surface, a gear surface initial angle parameter corresponding to each measurement point of the actual gear surface is obtained, and the gear surface gear shape error is obtained through calculation. As a revolving platform of the machine tool is adopted to drive the gear workpiece to perform revolving or as the position of the articulated arm coordinate measurement machine is moved, the measurement of gears in different positions of the large gear can be realized.

The invention discloses a shortwave transmitting antenna three-dimensional directional diagram aerial mobile measurement system and method. The system comprises a field intensity measurement system which is composed of a loop antenna and a field intensity instrument host and an unmanned aerial vehicle platform and other parts. Computation is performed by a field intensity signal preprocessing module, a standard directional diagram computing submodule, a spatial spectrum processing submodule, a digital beam forming submodule and a transmitting antenna calibration factor computing submodule. The omnidirectional loop antenna is mainly adopted to measure field intensity signals, acquire and store the field intensity signals and preprocess the field intensity signals, then the signals are further processed through the spatial spectrum estimation technology, and finally testing is performed on the unmanned aerial vehicle platform. The index is provided for assessment of a shortwave transmitting antenna directional diagram, and online automatic monitoring of the antenna directional diagram can be realized without influencing the real-time performance and the effectiveness of the shortwave transmitting antenna so that the system and the method have the characteristics of being simple in equipment and convenient to operate.

The invention belongs to the field of measuring techniques, and relates to a method for measuring aero-engine compressor blades based on a three-coordinate measuring machine and applicable to an aero-engine swallow tail-type rabbet blade three-coordinate measurement. According to the invention, when the blades are measured on the three-coordinate measuring machine, a measuring clamp can be shared through double stations and multiple part numbers, different measuring procedures can be formulated, and one measuring clamp can be used for measuring a plurality of various-typed blades, so that the situation that one type of blades uses a set of three coordinate measuring clamp in the prior art is changed, and cost for designing, manufacturing and safeguarding the measuring clamp is saved. When measuring blades in batches, the double-station measuring clamp enables the measuring machine to measure blades on two stations continuously and alternately by formulating circulating measuring procedure, so that the time of halt for waiting loading and unloading blades after measuring one blade in the prior art is saved, and the measuring efficiency is improved. The measuring method can be popularized to three-coordinate measurement for all parts.

The invention discloses a device for measuring the thickness of a battery. The device comprises a base (1), wherein a to-be-measured battery is arranged at the top part of the base (1); the left end wall of the base (1) is connected with a side bracket (3); a dial gauge bracket (6) is transversally arranged on the left side at the top part of the side bracket (3); a dial gauge (13) is arranged at the top part on the right end of the dial gauge bracket (6); the bottom surface of the dial gauge (13) is connected with a dial gauge stick (14); and the dial gauge stick (14) is located right above the base (1). The invention discloses the device for measuring the thickness of the battery; and the device rapidly efficiently measures the thickness of the battery, can efficiently avoid measurement errors caused by the deformation of the battery, greatly improves the thickness measurement efficiency for the battery, further reduces the manufacture cost of the battery, improves the whole production quality of the battery, and broadens the market prospect of the battery manufacturer.

The invention provides a method for detecting any defect in the inner wall of a hole by an optic way, which comprises the following procedures: a light pickup picks up an image formed by laser after reflecting on the inner wall of the hole, so as to get the depth at any point on the inner wall of the hole; the light pickup picks up an image formed by an illumination light after reflecting on the inner wall of the hole, so as to get the explored image of the inner wall of the hole and get the 2D sizes of the defect; and the 3D info on the defect is obtained by combining above two dimensions. By combining laser measurement with illumination light measurement, it is not only possible to get the 2D size of the defect, but also is possible to get the depth of the defect, so as to achieve 3D measurement of the defect; the use of a non-contact measuring way avoids any contact wear between a probe and the object to be measured, and improves the inspection speed.

The invention belongs to the measurement technical field of atmosphere environment quality, which specifically relates to an online automatic measuring system for environment air quality based on low-temperature condensing method sampling. The system is composed of a low-temperature condensing sampling system and an analyzing system; the low-temperature condensing sampling system comprises a drying pipe, an electronic cold trap and a low-temperature low trap that are connected in turn; the drying pipe is connected with an air inlet pipeline for removing vapor and condensing the environment air sample at low temperature; the analyzing system comprises a light source, a sampling battery, an optical spectrum instrument and a computer; the analyzing system splits and detects the air condensed by the sampling system through the optical spectrum instrument by the ultraviolet function from the light source and then analyzes the air by the computer. The system is high in integrated degree and measuring efficiency, which is suitable for continuous, real-time and online measurement of various pollutants of atmosphere environment (including sulfur dioxide, nitrogen dioxide, ozone, ammonia, formaldehyde and part of benzene series) in environment air.

The invention discloses a device for measuring wall thickness. A part to be measured is placed on a turntable, and one scanning measurement is completed after the turntable rotates one circle. Thus, the measurement efficiency is greatly improved. The height of a vertical rod can be adjusted by rotating a rotary base, and the operation is very convenient. In addition, a measuring rod is set to onlymove in the axial direction in the shell, so that there is no radial offset between the measuring rod and the shell. The change of wall thickness is directly converted into the amount of travel of the measuring rod in the axial direction, and the amount of travel of the measuring rod is directly displayed through a display element, so that the measuring accuracy is ensured. Moreover, a first elastic piece is arranged between the measuring rod and the shell. Because of the automatic rebound of the first elastic piece, two contacts can always be close to the inner and outer walls of the part tobe measured during measurement. Therefore, line scanning measurement of the part to be measured can be realized, and all surfaces with wall thickness requirement can be covered. The measurement efficiency is greatly improved.

The invention discloses a device for rapidly detecting size parameters of a cylinder type excircle shape, and aims at providing the rapid detection device simple in structure, high in measuring efficiency and capable of improving the measuring precision. A CCD camera (5) whose lens just faces a clamped detected workpiece (2) is arranged over the clamped detected workpiece, the CCD camera (5) collects images of the clamped detected workpiece which is driven by a servo motor to rotate, the collected calibration position size of each groove is converted into a digital signal, the digital signal is transmitted to a circular grating (4) fixed on a main shaft of the servo motor, the angular displacement of the detected workpiece, namely a moving object, is obtained, a linear array photosensitive tube calculates the position size of each groove via a computer image processing software system input by a reading head device, parameters including the width, the position accuracy and the verticality of the calibration groove of the detected workpiece are displayed and printed. The device can be used to overcome the disadvantages that errors of manual measurement influence test results a lot and cause low measuring efficiency.

A double offset parameter circle contour measurement model and an offset error separation method belong to the technical field of surface shape measurement. The model simultaneously includes two offset error components: offset error of the detected component (e, Alpha) and offset error d of the measuring head of a sensor. The measurement model is that Rho i is equal to ecos(Theta i-Alpha)+((ro+Delta ri)<2>-(d+esin(Theta i - Alpha))<2>)<1/2>. The method of parameter optimization is adopted to realize accurate estimation and direct solving of offset error parameters and other parameters in the model, thus separating the offset parameters one by one from the measuring data and acquiring the actual circle contour of the detected piece. The measurement model provided by the invention can completely and accurately reflect the influence of the offset error parameters to the measurement of the circle contour and overcome the problems of principle defect and low parameter estimation accuracy existed in the generally used measurement model at the present time.

The invention provides an automatic iron tower inclination angle measuring method based on a machine vision system. The machine vision system comprises an unmanned aerial vehicle carrier, a visual light camera and an identifier measuring device. The automatic measuring method based on the machine vision system comprises the steps that 1, the unmanned aerial vehicle carrier flies to a designated preset position under the control of a flight control system; 2, after the unmanned aerial vehicle carrier flies to the preset position, unmanned aerial vehicle carrier posture adjustment is performed; 3, after the unmanned aerial vehicle carrier reaches a predetermined posture, the visual light camera shoots images, an onboard embedded processor repeatedly reads the shot images and detects red round identifying plates at the upper and lower position of an iron tower; 4, after the two red round identifying plates are successively detected, the onboard embedded processor calculates the inclination angle eta of the iron tower. The visual light camera is carried by utilizing the unmanned aerial vehicle carrier, measurement of the iron tower inclination angle can be automatically completed, the working strength of measurement is reduced, and meanwhile the measurement efficiency is improved.

The invention relates to the field of measurement equipment, in particular to automatic measurement equipment for the profile and the position of a logo mounting hole. The automatic measurement equipment comprises a processing device as well as three precision servo motion platforms and five cameras which are controlled by the processing device, wherein a first precision servo motion platform drives a first camera and a second camera to perform shooting scanning on two long edges of a rectangular casing of a to-be-measured product, a second precision servo motion platform drives a third camera and a fourth camera to perform shooting scanning on two short edges of the rectangular casing of the to-be-measured product, a third precision servo motion platform drives a fifth camera and a second camera to perform shooting scanning on the logo mounting hole of the to-be-measured product, and the processing device can calculate the profile and the position of the logo mounting hole according to the measurement data provided by the five cameras. The automatic measurement equipment can be well applied to the application condition of batch product manufacture.

The invention discloses a method for measuring precision of a 1# frame of a plane general assembly, which comprises the following steps of: 1) levelling a plane to ensure that a measuring coordinate system of a laser tracker is unified with an assembly coordinate system of a station position of the plane general assembly; 2) measuring a 2# measuring point and a 12# measuring point by using the laser tracker, and constructing a symmetrical axial line of the plane automatically by using a computer; 3) starting a measuring program to measure four drone points on the 1# frame by adopting a manual or automatic measurement mode; and 4) calculating deviations of the 1# frame relative to a construction horizontal surface of the plane and the symmetrical axial line of the plane. The method has the following advantages that: 1) compared with a conventional optical measurement method, a digitized measurement system can effectively improve the measurement precision and greatly improve the measurement efficiency; and 2) the automation and integration levels of the plane general assembly are further improved.

The invention discloses a liquid sample cell which comprises a first optical window and a second optical window, wherein a groove is carved on the first optical window, the first optical window and the second optical window are laminated and sealed, and a sample cavity is formed at the groove position. By using the liquid sample cell for measurement, the measurement of trace sample can be met, the measuring error is effectively reduced, different samples have more reliable reference value and the measuring efficiency is improved. Dynamic sample measurement can be realized by adopting a sample flowing manner.

An interference type double-imaging measurement device for multiple parameters of a liquid crystal spatial light modulator relates to the technical field of photo-electricity test. The invention solves the problem that the characteristic parameter measurement device of the existing liquid crystal spatial light modulator can not satisfy the requirement of multi-parameters measurement. By introducing a double-imaging system in a Twyman-Green interference light path, the invention integrates the double light path interference and common path interference into a device. Input light enters in a first dispersion prism through a beam expanding lens and a polarizer. Transmitted light is modulated and reflected by the liquid crystal spatial light modulator and then reflected by a reflecting mirror through a shutter. The two-way lights enter in a second imaging system through a second dispersion prism after passing through the first dispersion prism and an analyzer. After reflected by the liquid crystal spatial light modulator, the transmitted light can also directly enter in a first imaging system through the first dispersion prism, the analyzer and the second dispersion prism. The invention realizes the measurement of multi-parameters by using the double-imaging system to respectively detect phase and strength. The measurement device is applicable to the measurement process of multi-parameters of the liquid crystal spatial light modulator.

The invention discloses a measurement method of series resistors inside a solar energy battery and a measurement system. Current is reversely input into the solar energy battery to replace a second light process of two light measurements commonly used. Because the light processes are reduced, on the one hand, reduction of consumed time and enhancement of measurement efficiency accord with market status that demand of the solar energy batteries surges, on the other hand, the service life of a light source is prolonged. Maintenance of light-emitting simplicity of the light source can ensure the precision the measurement, thereby the demand of maintenance is reduced, the operation cost is reduced, and the measurement of the solar energy battery is more effective.

The invention discloses an automatic guide method for collimation measurement of a cubic mirror based on machine vision. The method comprises the following steps: rotating an industrial camera together with a theodolite, keeping the relative position relationship unchanged, controlling the camera to collect an image of a cubic mirror to be measured, identifying the cubic mirror by image processing, extracting corner points of the cubic mirror, and obtaining the coordinate values of the corner points under an image coordinate system; establishing a mathematical model of a camera coordinate system, a cubic mirror coordinate system and a theodolite coordinate system, performing coordinate transformation and calculating the position of an intersection of a normal line of a mirror surface to be measured of the cubic mirror and a movement plane of the theodolite under the mathematical model, controlling the theodolite to move to the position of the intersection, and adjusting the posture of the theodolite according to the normal direction of the mirror surface to be measured of the cubic mirror, so that the normal direction of the mirror surface to be measured of the cubic mirror moves into the range of field of view of the theodolite, and the automatic collimation of the cubic mirror is implemented on the basis of the automatic theodolite collimation step for image identification.

According to a ground feature contour extraction method based on a ground laser point cloud provided by the invention, surface-based space measurement breaking through a traditional single-point measurement mode is introduced into urban measurement application, and the urban measurement efficiency is improved. As the most important space entity of a city, the three-dimensional information of ground objects, especially buildings, is the important basic geographic information of the city and has important application value. The whole scanning process is high in data acquisition efficiency, ground control points do not need to be specially arranged, scanning measurement is slightly influenced by the external environment, and the measurement precision is high. Not only is automation degree ofbuilding space data acquisition improved, but also scanned point cloud can express real three-dimensional information and detail structure of a building in detail. Accurate contour information is acquired by means of the point cloud data, and a three-dimensional model of the building is reconstructed. The method has the advantages of high interaction performance, high intelligent degree, high expandability, high extraction speed, high contour extraction precision and the like.

The invention relates to the display technology, and more particularly relates to a panel compensation device and a panel compensation method used for eliminating uneven brightness of an LCD panel, and a display device comprising the panel compensation device. The panel compensation device comprises a first input end, a second input end, a compensation unit and an output end, wherein the first input end is configured to receive a display driving signal applied on each pixel; the second input end is configured to receive a temperature signal associated with each pixel; the compensation unit is coupled with the first input end and the second input end, and is configured to compensate for the display driving signals of the pixels in an abnormal display region from the first input end, so that the pixels have identical brightness under the same voltage level of the display driving signals; and the output end is coupled with the compensation unit, and is configured to output the compensated display driving signals.