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128results about How to "Achieve precise calibration" patented technology
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Mixed calibration method for Inertial measurement unit capable of eliminating gyro constant drift
InactiveCN1763477AHigh accuracy of installation errorImprove calibration accuracySpeed measurement using gyroscopic effectsNavigation instrumentsGyroscopeAccelerometer
The invention discloses a method for marking IMU each item error coefficient precisely, which comprises the following steps: marking the gyroscopic scale factor and gyroscopic installment error in the IMU error model through dynamic calibration experiment; substituting the error value in the symmetrical 24 position static calibration experiment of adjacent position; adapting the symmetrical position error cancellation law to mark IMU residual each item error coefficient within gyroscopic constant drift, error item of gyroscope and acceleration, accelerometer constant bias, accelerometer marking factor and accelerometer fixation error.
Owner:BEIHANG UNIV
Laser linear scanning three-dimensional measurement double liquid knife virtual grid mapping calibrating method and equipment
InactiveCN1354355AAchieve precise calibrationUsing optical means3D-image renderingGOT measurementThree dimensional measurement
The invnetion discloses a method and set for calibrating the mapping of virtual grid by using double light-knifes in three-dimension measure of laser line scanning. The set includes central processing unit, controller, measuring base stage, translating slide guides, photoelectric measuring head and standard flat plate. There are three slide guides along X, Y, Z, axes, and said measuring head is installed on the lower end of Z-axis. The standard flat plate is on the surface of base stage. The virtual grid builds up the relationship of mapping function between two-dimension imaging space and two-dimension physical space, so as to realize accurate calibration of measuring system. When measuring is carried on, the coordinate values of physical space that is relevant to each imaging point on measuring light-knifes can be measured. With scanning by the photoelectric measuring head going on, the information of three-dimension contour of surface of object measured can be obtained.
Owner:XI AN JIAOTONG UNIV
Realization method for mechanical arm calibrating and tracking system based on visual motion capture
ActiveCN102848389AAchieve precise calibrationReal-time calculation of corner sizeProgramme-controlled manipulatorEffective solutionMedicine
The invention relates to a method for calibrating a mechanical arm joint and calculating a rotating angle based on visual motion capture and discloses a mechanical arm calibrating and tracking system based on the visual motion capture. The mechanical arm calibrating and tracking system comprises an optical driven motion capture system, computer master control equipment, visual software and an external display screen. The mechanical arm calibrating and tracking system comprises the following modules including a motion capture data acquiring and processing module, a mechanical arm joint calibration module, a joint angle calculation module and a three-dimensional virtual scene reproducing module based on OpenGL. The invention can be used as a practical and effective solution for calculating the mechanical arm joint and calculating the angle and has a favorable application prospect.
Owner:ZHEJIANG UNIV
System and method for measuring frame delay time of photographing system of optical measurement device
ActiveCN102892027AEasy to controlCalibration results are accurate and reliableMeasurement devicesTelevision systemsTime informationLed array
The invention discloses a system and a method for measuring frame delay time of a photographing system of an optical measurement device. The system comprises an image recording apparatus (1), a photographing system (2), a timing terminal (3), a control and display LED (Light-Emitting Diode) lamp array apparatus (4) and an LED lamp array (5). The method comprises the following steps of: judging the number of image outputting delay frames of a video camera, according to the time information on a digital image output by the photographing system and the information of the LED lamp array; providing time and external interruption signals by the timing terminal; recording the image of the photographing system and superposing the time information of the recording moment by the image recording apparatus; controlling an LED array to turn on or turn off the LED lamps by the control and display LED lamp array apparatus according to the external interruption signal and the time information; and imaging the LED array by the photographing system. The system and the method provided by the invention realize accurate calibration on image outputting delay time of the photographing system.
Owner:INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
Vision positioning guiding device and guiding method
ActiveCN107584263AAchieving submillimeter guided positioningAchieve precise calibrationImage analysisMetal working apparatusVisual positioningComputer science
The invention discloses a vision positioning guiding device and guiding method. The device includes a visual system, a visual system calibration module, a servo system calibration module, a vision rough positioning module, a vision precise positioning module, a vision guiding path optimization module and a PLC communication interaction module and the like. Precise calibration of the vision systemand a servo system and precise positioning guiding and guiding path optimization in the industrial automation assembly process are achieved, precise positioning guiding requirements in the industrialautomation assembly process can be met, high positioning precision is achieved particularly for large industrial assembly, and the requirements of accurate visual positioning guiding in the industrialautomation assembly process are met.
Owner:上海赛摩电气有限公司
Testing device and method for measuring laser range finder transmitting and receiving axis matching degree
InactiveCN101059564ASimple structureHigh precisionElectromagnetic wave reradiationObject systemBeam angle
The invention discloses a device for testing the registration of receiving shaft and emitting shaft of a laser ranging system, wherein the device comprises a beam folder, a collimator, an analogue echo generator, and a beam angle micro adjuster. The analogue echo generator is composed of a fiber couple, a multimode fiber, a fiber collimator, and an adjustable fiber attenuator. Th method uses the collimator and the beam angle micro adjuster to adjust a reference beam and an analogue echo parallel to accurately mark the initial position of the analogue echo light, adjusts the beam angle micro adjuster, to watch the change of the output signal of the receiving part of the object system to obtain the adjusted angle value, to be compared with the angle value of the initial position to obtain the horizontal and vertical bias of the emitting shaft and the receiving shaft of the laser ranging system. The invention has the advantages that the invention directly uses the laser of the object system to couple, without additional lasers, with simple structure, and combines the beam angle and the output signal of the object system, to improve the reliability and accuracy of the test result.
Owner:SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
Self-calibrating method of two-dimensional large-stroke precision workbench measuring system
ActiveCN104006777ARealize accurate calibration in situAchieve precise calibrationMeasurement devicesSystem transformationComputer vision
The invention relates to a self-calibrating method of a two-dimensional large-stroke precision workbench measuring system and belongs to the field of precision machining and measurement. The self-calibrating principle is utilized for the method, a glass plate with even grids is used as an auxiliary measuring device, a two-dimensional workbench is self-calibrated respectively according to areas, and system errors of all the areas are obtained; system error compensation is performed on the corresponding areas, and coordinates of discrete points in calibration coordinate systems are obtained; linear fitting is performed on the coordinates of the discrete points in all the areas, and grids of the calibration coordinate systems are obtained; on the basis of the coordinate system transformation principle, the calibration coordinate systems of the adjacent areas are transformed, a unified calibration coordinate system in the whole area is obtained, and finally the two-dimensional large-stroke precision workbench measuring system can be self-calibrated. Through the self-calibrating method, large-stroke and high-precision self-calibration of the two-dimensional workbench is achieved, and meanwhile the function of calibrating the high-precision two-dimensional workbench through the low-precision grid glass plate is achieved. A high-precision calibrating tool is not needed, and the self-calibrating method is high in calibration precision and suitable for calibrating various two-dimensional precision workbenches.
Owner:TSINGHUA UNIV +1
Method for directly calibrating micro thrust and micro impulse
ActiveCN102721456AReduce mistakesAchieve precise calibrationWeighing apparatus testing/calibrationStress pointEngineering
The invention discloses a method for directly calibrating micro thrust and micro impulse. By the method, the characteristics of uniform magnetic induction intensity distribution and extremely small magnetic flux leakage in an electromagnet air gap are utilized, a current-carrying wire passes through the air gap, the action of certain ampere force is applied to the wire, and the ampere force and the acting time are measured, so that the micro thrust and the micro impulse can be calibrated. When static thrust is calibrated, a stressed coil is arranged at a stressed point of a measuring device, the position of an electromagnet is adjusted, the ampere force direction of the stressed coil is taken as the thrust direction to be calibrated, and the static thrust can be calibrated according to the linear relation between the current of the stressed coil and the stressed ampere force. When the micro impulse is calibrated, the current of the stressed coil and the acting time of the current are measured, and the impulse of the ampere force can be acquired by using the calibrated linear relation between the current and the ampere force of the stressed coil, so that dynamic impulse can be calibrated. The method overcomes the defect of the conventional calibrating method and has the outstanding advantages of small error, high precision, wide calibrating range and the like.
Owner:湖南鸿星科技有限公司
Method for accurately positioning vision in cleaning robot of condenser
ActiveCN101354785AAchieve precise calibrationEasy to cleanImage enhancementImage analysisNonlinear distortionLow-pass filter
The invention discloses an accurate vision positioning method for condenser cleaning robots. The method comprises the following steps that: the coordinate transformation relation between a camera coordinate system and an image plane, as well as the coordinate transformation relation between the image plane and a pixel coordinate system are established; nonlinear distortion is introduced on the basis of a pinhole imaging model, and a distorted image is restored; main noise of an underwater image is eliminated through an index low-pass filter and a homomorphic filter; a novel self-adaptive threshold method based on edge detection is utilized to carry out binarization segmentation to the image and eliminate incomplete tube orifices on a boundary; the edge pixel coordinate set of each tube orifice is obtained by scanning twice; and a least square method is utilized to fit the tube orifices so as to obtain a circle center coordinate of the tube orifice of a condensing tube, thereby realizing the accurate positioning of the underwater condensing tube. The invention has the advantages that the method is high in positioning precision and simple in process, needs no high-cost auxiliary adjustment equipment, and is applicable to the condenser cleaning robots in the on-site calibration for condensing tube orifices.
Owner:HUNAN UNIV
Calibrating device for eddy sensor
InactiveCN102538652AImprove adaptability and accuracyReduce the impactUsing electrical meansMicrometerSensor holder
The invention discloses a calibrating device for an eddy sensor. The calibrating device comprises a micrometer, wherein the micrometer is fixed on a rack base through a micrometer bracket; a measuring flat-end is connected with the micrometer; a sensor bracket is fixed on the rack base; a sensor positioning block is fixed on the sensor bracket; the sensor bracket and the axis of the micrometer bracket are on the same straight line; a V-shaped groove structure is arranged on the sensor bracket; the eddy sensor is clamped in the V-shaped groove structure and locked through the sensor positioning block and a positioning screw; the rack base is made from high-carbon steel and marble materials; the reaction of the eddy sensor to displacement variation can be calibrated by fine adjustment to precision of the micrometer; calibration is realized by data comparison; and by changing the distance between the eddy sensor end surface and the measuring flat-end, the linearity and the sensitivity of the eddy sensor can be measured. Therefore, the calibrating device has the characteristics of high resolution, easy operation and adjustable linear range, and has the advantages of stable and reliable detection result and simple operation.
Owner:XI AN JIAOTONG UNIV
Method and device for calibrating relative attitude of camera and rotating shaft, and storage medium
The invention discloses a method and device for calibrating the relative attitude of a camera and a rotating shaft, and a storage medium, and the method specifically comprises the steps that a first camera collects a sampling image at each sampling position, the sampling position is a stop position after the rotating shaft drives a second camera to rotate by a preset angle, and the sampling imagecomprises a whole first calibration plate; extracting each first angular point on each sampling image, and a fitting plane of each first angular point is generated; the coordinates of each first angular point at each sampling position are respectively projected on a corresponding fitting plane to generate a fitting circle of each first angular point; and first attitude calibration parameters ofthe second camera and the rotating shaft are calculated according to the fitting circle, and the relative attitudes of the second camera and the rotating shaft are adjusted according to the first attitude calibration parameter. The first camera is arranged to assist in calibrating the second camera and the rotating shaft, the first attitude calibration parameters of the second camera and the rotating shaft are calculated, and accurate calibration between the rotating shaft and the camera is achieved.
Owner:BEIKE TECH CO LTD
Digital camera projection center position precision calibration method based on photogrammetric technology
InactiveCN105424058AAchieve precise calibrationExcellent positioning accuracyMeasurement devicesCamera lensTheodolite
The invention relates to a digital camera projection center position precision calibration method based on a photogrammetric technology, and aims at effectively solving the problems of high precision and operability. The method comprises the steps that a return light reflection measurement mark, a control point mark, an encoding mark, a directional target and a standard ruler are laid to form a calibration field; an electronic theodolite and a to-be-inspected camera are arranged at the position 3 meters away from the calibration field, and the return light reflection measurement mark is stuck to a camera lens; the calibration field is photographed by the camera at the different horizontal positions to obtain multiple photos, the calibration field is photographed by the to-be-inspected camera at the different positions in front of the calibration field at different attitudes, and data of the control point mark are extracted from the photos to form calibration data; the coordinates of a central image point of the control point mark are corrected and resolved to obtain three projection center positions. According to the method, control point mark image center measurement, high-precision camera calibration and projection center precision measurement can be integrally achieved, and the calibration precision of the projection center positions is higher than 5 mm.
Owner:THE PLA INFORMATION ENG UNIV
Calibration device and calibration method of white light interference atomic-power scanning probe
ActiveCN104730293ADisplacement value storageAchieve traceable calibrationScanning probe techniquesData processing systemLaser interference
The invention discloses a calibration system and calibration method of a white light interference atomic-power scanning probe based on contact measurement. The calibration system comprises a face CCD measurement system, an atomic-power probe scanning microscope module, a white light source system, a nanoscale vertical micro-displacement platform, a laser interference displacement metering system and a data processing system, wherein the face CCD measurement system, the white light source system and the atomic-power probe scanning microscope module are fixed to the nanoscale vertical micro-displacement platform, displacement is produced by receiving a control instrument of a main control machine, and accordingly a probe in the atomic-power probe scanning microscope module deforms. The laser interference displacement metering system is arranged on the nanoscale vertical micro-displacement platform and used for metering the displacement of the nanoscale vertical micro-displacement platform acting on the probe. By means of the calibration method, quick high-accuracy calibration can be achieved.
Owner:HUAZHONG UNIV OF SCI & TECH
Calibration method and device of proximity sensor, electronic equipment and storage medium
ActiveCN109840032AAchieve precise calibrationTroubleshoot near-functional misbehaviorInput/output processes for data processingProximity sensorTransmitted power
The embodiment of the invention provides a calibration method and device for a proximity sensor, electronic equipment and storage medium, The method is applied to the electronic equipment provided with a proximity sensor below a touch display screen. The method comprises the following steps of: if it is detected that the electronic equipment is in the screen-off state, acquiring an approximate value corresponding to each infrared emission power when the proximity sensor carries out detection according to two different infrared emission power; and determining whether a calibration condition ofthe proximity sensor is met or not according to the proximity value corresponding to each infrared transmitting power, each infrared transmitting power and the proximity value corresponding to each infrared transmitting power, and calibrating the proximity threshold value of the proximity sensor when the calibration condition is determined to be met. According to the method, whether the calibration condition of the proximity sensor is met or not can be effectively determined, accurate calibration of the proximity sensor is achieved under the condition that the calibration condition is met, andthe problem that the proximity function of the proximity sensor is abnormal can be effectively solved.
Owner:GUANGDONG OPPO MOBILE TELECOMM CORP LTD
Vehicle-mounted laser scanning system external parameter calibration method and device
PendingCN111650598AAchieve precise calibrationAutomate quicklyElectromagnetic wave reradiationPoint cloudIn vehicle
The invention provides a vehicle-mounted laser scanning system external parameter calibration method and device, and the method comprises the steps: carrying out the data collection in a selected calibration scene according to a preset multi-direction collection route; calculating an external parameter initial value by using a hand-eye calibration method based on the acquired data; splicing the point clouds at different positions acquired by the laser radar according to an iterative nearest point algorithm by combining the pose information of the inertial navigation system and combining the calculated external parameter initial values, and calculating a matching distance residual error; optimizing an external parameter by adopting a nonlinear optimization algorithm, updating an initial value of the external parameter by using the optimized external parameter, recalculating a matching distance residual error, and carrying out repeated iterative computation; and taking the external parameter as a calibration external parameter until the matching distance residual error is smaller than a preset threshold value or the number of iterations reaches the maximum number of iterations. According to the method, accurate calibration of the external parameters of the vehicle-mounted laser scanning system is rapidly and automatically realized without a fixed calibration field and artificialparticipation in point selection.
Owner:BEIJING JINGDONG QIANSHITECHNOLOGY CO LTD
Carrier three-times difference-based outdoor GNSS absolute antenna phase center calibration method
ActiveCN107290762AImprove calibration accuracyAchieve precise calibrationSatellite radio beaconingDouble differenceObservational error
The present invention discloses a carrier three-times difference-based outdoor GNSS absolute antenna phase center calibration method. According to the method, firstly, a short baseline is subjected to double-difference resolving during the large-angle and rapid movement of a precision mechanical arm. Secondly, three differential processes among epochs are conducted after the ambiguity is fixed. An extremely short epoch interval can eliminate the antenna phase center errors of a reference station. Moreover, measurement errors caused by the multi-path effect are greatly weakened. Therefore, the antenna absolute phase center compensation PCO and the antenna phase center variation PCV of a GNSS are accurately modeled. According to the invention, based on the outdoor actually-measured data of the GNSS, the phase center errors of a to-be-measured antenna can be separated from relative positioning residual errors. Moreover, the suppression effect on the multi-path effect in the low-height angle observation mode is more obvious. As a result, the PCO calibration and the PCV calibration at the precision of 1mm are realized. The method has an obvious improving effect on the high-precision positioning of GPS / BDS / GLONASS / GALILEO systems.
Owner:WUHAN UNIV
Microwave photon delay time measurement calibration device
The invention provides a microwave photon delay time measurement calibration device. The device includes three parts of a delay time measurement system, a phase detection calibration system and a to-be-measured optical path. A set of single-frequency signals generated by a signal generator inside the phase detection calibration system can select and use other multiple different frequency points, all the frequency points satisfy certain multiple relationships, and microwave photon link delay time is calibrated through detecting differential phases of all the frequency points between a referenceoptical link and the measured optical link and phase quantization. The device of the invention eliminates the 360-degree phase ambiguity problem in phase measurement on a principle scheme, can realize accurate calibration on a high-precision optical delay time quantity measurement device by using a highly stable hydrogen clock and an optical delay model, and can use more standard frequency signals for larger delay time quantity measurement.
Owner:ZHEJIANG UNIV
Extremely high vacuum gauge calibration device and method
ActiveCN102944356ALarge measuring rangeReduce measurement uncertaintyFluid pressure measurementVacuum extractorEngineering
The invention discloses an extremely high vacuum gauge calibration device and a method, belonging to measurement field. The device comprises an extremely high vacuum gauge, an extremely high vacuum calibration room, a first valve, a vacuum gauge to be calibrated, a small hole, a second valve, a third valve, a high-precision vacuum gauge, an extremely high vacuum aspirating chamber, an extremely high vacuum air-bleed set, a flow limiting hole, a pressure stabilizing chamber, a non-evaporable getter pump, an air source, a micrometering valve, a flowmeter air-bleed set and a fourth valve, and the peripheral equipment includes a heating device. With the device and the method disclosed by the invention, the measurement uncertainty is small, accurate calibration to the extremely high vacuum gauge within the pressure range smaller than 10<-9>Pa can be realized, and the flow measurement range is expanded.
Owner:NO 510 INST THE FIFTH RES INST OFCHINA AEROSPAE SCI & TECH
Radar two-dimensional installation attitude calibration method and system based on global positioning system target
PendingCN113093130AEasy to handleAchieve precise calibrationWave based measurement systemsRadar data processingPoint cloud
Owner:WUHAN UNIV OF TECH
Calibration method of outdoor gnss absolute antenna phase center based on carrier triple difference
ActiveCN107290762BImprove calibration accuracyAchieve precise calibrationSatellite radio beaconingStationCarrier signal
The present invention discloses a carrier three-times difference-based outdoor GNSS absolute antenna phase center calibration method. According to the method, firstly, a short baseline is subjected to double-difference resolving during the large-angle and rapid movement of a precision mechanical arm. Secondly, three differential processes among epochs are conducted after the ambiguity is fixed. An extremely short epoch interval can eliminate the antenna phase center errors of a reference station. Moreover, measurement errors caused by the multi-path effect are greatly weakened. Therefore, the antenna absolute phase center compensation PCO and the antenna phase center variation PCV of a GNSS are accurately modeled. According to the invention, based on the outdoor actually-measured data of the GNSS, the phase center errors of a to-be-measured antenna can be separated from relative positioning residual errors. Moreover, the suppression effect on the multi-path effect in the low-height angle observation mode is more obvious. As a result, the PCO calibration and the PCV calibration at the precision of 1mm are realized. The method has an obvious improving effect on the high-precision positioning of GPS / BDS / GLONASS / GALILEO systems.
Owner:WUHAN UNIV
Meshed field crop base fertilizer application effect evaluation model
InactiveCN113396681AAchieve protectionRealize cost savings and efficiency gainsFertilising methodsField cropSoil science
The invention relates to the field of intelligent agriculture, in particular to a meshed field crop base fertilizer application effect evaluation model which is composed of a soil testing and fertilization model, a mesh dividing model and a fertilization effect evaluation model, wherein the soil testing and fertilization model is a fertilizer preparation algorithm model of fertilizers such as nitrogen, phosphorus, potassium, medium trace elements and the like according to the fertilizer demand of crops, the fertilizer supply capacity of soil and the fertilizer effect on the basis of soil detection and field tests; the mesh dividing model is a land mesh model in which soil nutrient content is used as a parameter, and the mesh dividing model is used for performing mesh dividing on soil according to soil census, cultivated land fertility survey or local field test data; and the fertilization effect evaluation model is a model for performing grade evaluation on the final actual base fertilizer fertilization effect of the whole target plot by performing result comparison with the optimal fertilization amount provided by the soil testing and fertilization model in each mesh and taking the area proportion of each mesh as a weight.
Owner:哈尔滨航天恒星数据系统科技有限公司
Calibration method and calibration device based on human-computer interaction and storage medium
ActiveCN111627073AAchieve precise calibrationImage analysisAcquisition apparatusTransformation parameter
The invention discloses a calibration method and calibration device based on human-computer interaction and a storage medium. The method specifically comprises the following steps: enabling image acquisition equipment to acquire a first to-be-processed image containing a calibration plate at a current sampling position; calculating a first transformation parameter of the image acquisition equipment corresponding to the first to-be-processed image relative to the calibration plate; according to a preset sampling position and the first transformation parameter, calculating a translation relationship and a rotation relationship between the current sampling position of the image acquisition device and a preset sampling position, adjusting the image acquisition device to the preset sampling position based on an instruction generated by the translation relationship and the rotation relationship, acquiring a second to-be-processed image at the preset sampling position, and calculating camerainternal parameters and distortion parameters of the image acquisition device. According to the embodiment of the invention, the image acquisition equipment acquires the image at the preset sampling position in a man-machine interaction mode, the camera internal reference and distortion parameters of the image acquisition equipment are calculated, measurement is carried out without the assistanceof indirect measurement equipment, and accurate calibration of the image acquisition equipment is achieved.
Owner:BEIKE TECH CO LTD
Method and device for calibrating rotating shaft and storage medium
PendingCN111627070AAchieve precise calibrationImage enhancementImage analysisRotational axisAcquisition apparatus
The invention discloses a method and device for calibrating a rotating shaft and a storage medium. The method includes: specifically, enabling an image acquisition device to acquire a to-be-processedimage containing a first calibration plate; calculating a deflection angle of the position of the image acquisition equipment relative to the position of the first calibration plate; according to thedeflection angle, enabling the rotating shaft to drive the image acquisition equipment to rotate to a first sampling position and a second sampling position respectively; collecting a first sampling image at the first sampling position, collecting a second sampling image at a second sampling position, wherein an included angle formed between the first sampling position and the second sampling position is the maximum rotation range of the image acquisition equipment driven by the rotating shaft to acquire the complete first calibration plate, and calculating attitude calibration parameters of the image acquisition equipment and the rotating shaft according to the first sampling image and the second sampling image. According to the embodiment of the invention, the image acquisition device isdriven by the rotating shaft to acquire images, attitude calibration parameters between the image acquisition device and the rotating shaft are calculated, and accurate calibration of the rotating shaft is realized.
Owner:REALSEE (BEIJING) TECHNOLOGY CO LTD
Airborne laser radar beam pointing calibration method and system and laser spot detector
ActiveCN111044990AImprove target measurement accuracyAchieve precise calibrationWave based measurement systemsICT adaptationLight beamHorizontal orientation
The invention discloses an airborne laser radar beam pointing calibration method and system and a laser spot detector. The method comprises the following steps: step 1, arranging a laser spot detectorincluding a detector group and a detector group support frame in a scanning field of view of a laser radar; step 2, moving the detector group in a horizontal direction and / or a vertical direction, detecting the edge of a laser spot of the laser radar, and determining the central position of the laser spot; step 3, measuring space coordinates of the central position, and collecting laser measurement data of the laser radar for the central position; changing the position of the laser spot detector in a scanning field of view of the laser radar, and executing the steps 2-3 to enable the laser spot detector to detect different laser spots in the scanning field of view; and step 4, according to the space coordinates of the central position of the laser spot and the laser measurement data, calculating calibration parameters of the laser radar by using a laser radar beam pointing model, thereby realizing airborne laser radar beam pointing calibration.
Owner:BEIJING SURESTAR TECH
Calibration system for fan electric generator set rotation shaft torque balance
PendingCN109580094AAchieve precise calibrationAchieve calibrationFluid pressure measurementWind energy generationElectric generatorData acquisition unit
The invention discloses a calibration system for a fan electric generator set rotation shaft torque balance. The calibration system for the fan electric generator set rotation shaft torque balance comprises a loading unit, a data acquisition unit and a control unit, the loading unit comprises loading tools and a loading mechanism, the loading tools comprise a base and a square plate used for applying a twisting torque, the lower end of the torque balance requiring to be calibrated is fixed to the base through screws, the upper end of the torque balance is fixed to the square plate through screws, the base and the square plate are both horizontally arranged, the loading mechanism is respectively connected with the square plate and the base in a ball-hinged mode, a torque Mx around an X-axis, a torque My around a Y-axis and a torque Mz around a Z-axis are applied on the torque balance through the square plate, the loading mechanism is in signal connection with the control unit through aforce transducer, and the data acquisition unit is in signal connection with the torque balance. According to the calibration system for the fan electric generator set rotation shaft torque balance, three torque values with large loads can be applied at the same time, so that accurate calibration of the torque balance is achieved.
Owner:BEIJING AEROSPACE YISEN WIND TUNNEL ENG TECH
PCA-based robot wire drawing high-speed railway white vehicle body workpiece accurate calibration method
ActiveCN110340738ASolve the problem of large errorsAchieve precise calibrationGrinding machinesPoint cloudDimensionality reduction
The invention provides a PCA-based robot wire drawing high-speed railway white vehicle body workpiece accurate calibration method. The method comprises the following steps of firstly, acquiring 3D point cloud information of a workpiece relative to robot body geodetic coordinates through robot tail end clamping scanning equipment; determining a point cloud boundary value by using a principal component analysis method, and generating a bounding box to determine the actual size of the workpiece to be machined; and finally adopting a point cloud dimensionality reduction simplification method and adichotomy method which meet machining precision requirements to quickly determine the position of the machined workpiece, providing a calibration strategy suitable for a robot to calibrate the largeworkpiece to be machined, and finally realizing accurate calibration of the robot wire drawing high-speed railway white vehicle body workpiece. By means of the method, the defect that the calibrationprecision generated by a traditional robot demonstrator calibration method is low can be effectively overcome, the calibration error caused by the installation error of the large workpiece can be eliminated, and the speed and accuracy of calibrating the large workpiece can be greatly improved.
Owner:WUHAN UNIV OF TECH
Micro-flow calibration device and method of double-channel symmetrical structure
ActiveCN107830914AAchieve precise calibrationReduce measurement impactTesting/calibration for volume flowEngineeringSymmetric structure
The invention discloses a micro-flow calibration device and method of a double-channel symmetrical structure. The device is composed of gas supply systems, stop valves, a needle valve, pressure gauges, monitoring pressure gauges, a pumping system, a flow calibration chamber, a flow comparison chamber, temperature collecting systems, a volume compensation system and micro flow measurement instruments; through pipeline connection, two channels which are symmetrically arranged on the left and right are built, the shapes of the symmetrical channels are symmetrical, and the geometrical dimensions of the symmetrical channels are the same. Through staged measurement in combination with the volume compensation system, effects of outlet pressure, the gas types and the temperatures on measurement are reduced to the minimum, so that precise calibration of the micro-flow measurement instruments under the different outlet pressure, in the different gas and at the different temperatures is achieved.
Owner:LANZHOU INST OF PHYSICS CHINESE ACADEMY OF SPACE TECH
Sheet material thickness detection tool and method
The present invention relates to a sheet material thickness detection tool. The tool comprises a workbench, a guide slot configured to transmit sheet materials and laser displacement sensors, the guide slot and the laser displacement sensors are located on the workbench, there are two laser displacement sensors which are respectively arranged at two sides of the guide slot, the two slot walls of the guide slot are respectively provided with corresponding gaps, the gaps are U-shaped slot structures, the gaps correspond to the laser displacement sensors, the front end of the guide slot is provided with an optoelectronic switch, and the lower of the guide slot is provided with an automatic calibration mechanism. The sheet material thickness detection tool can achieve automatic calibration, does not need frequent manual calibration and saves labor. The present invention further relates to a sheet material thickness detection method.
Owner:YANTAI UNIV
Line laser sensor space pose calibration piece and calibration method
ActiveCN113358025ASimple structureCalibration operation is simpleUsing optical meansLaser sensorMachining
The invention discloses a line laser sensor space pose calibration piece and a calibration method, which combine the advantages of gear measurement center contact measurement and a simple geometric feature calibration piece, and realize accurate calibration of a line laser sensor through simple and easy calibration operation. On the basis of a standard mandrel, a cuboid metal block is arranged in the middle of the axis, and the centers of the upper end face and the lower end face of the standard mandrel are each provided with a conical hole for fixing. The coaxiality and cylindricity of an upper shaft section S1 and a lower shaft section S2 of a standard core shaft part of the calibration piece are required to be 1 [mu]m. The perpendicularity of the plane I and the plane II is 1 [mu]m, and the parallelism of the plane I and the plane II and the axis of the standard mandrel is 1 [mu]m. The calibration piece is simple in structure, the existing manufacturing process can meet the machining requirement of high-precision geometrical characteristics, the calibration piece is combined with the advantage of gear measurement center contact type measurement, calibration operation is simple and easy to implement, and accurate calibration of the line laser sensor can be achieved.
Owner:BEIJING UNIV OF TECH
Calibration device and method for calibrating vacuum gauge by using vacuum leak hole
ActiveCN111220326AAchieve calibrationAccurate CalibrationFluid pressure measurementAir pumpGas supply
The invention discloses a calibration device and method for calibrating a vacuum gauge by using a vacuum leak hole. The device is composed of the vacuum leak hole, a stop valve, a pressure gauge, a calibrated vacuum gauge, an air pumping system, a pressure stabilizing chamber, a calibration chamber and an air supply system. When a gas flowing out of the vacuum leak hole with the known leak rate enters the calibration chamber, the gas in the calibration chamber generates the standard pressure through the accumulation for a period of time, and by comparing the standard pressure and the reading of the calibrated vacuum gauge, the calibrated vacuum gauge is calibrated. Compared with a conventional static expansion method, the device and the method have the advantages that the operation is simple, the efficiency is high, and the accurate calibration of different gases on the vacuum metering range width can be realized through one leakage hole.
Owner:LANZHOU INST OF PHYSICS CHINESE ACADEMY OF SPACE TECH
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