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215results about How to "Meet the requirements of measurement accuracy" patented technology
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Static and dynamic acceleration testing device
ActiveCN101173878AAccurate brake test test dataReliable brake test test dataVehicle testingTransmission systemsTester deviceEngineering
The invention relates to a static and dynamic acceleration tester, comprising a computer, a motion controller, a static acceleration generator, a dynamic acceleration generator, and a portable braking-ability testing instrument, wherein, the static acceleration generator mainly comprises a stepping motor, a photoelectric encoder, and an angular platform; the dynamic acceleration generator mainly comprises a servomotor and a rotation platform. The invention has the advantages of static and dynamic testing method, convenient installation, simple and quick testing process, high degree of automation, and ability of satisfying measuring precision requirement of related national standard, and calculating, memorizing, inquiring and printing the test result.
Owner:SHANGHAI SIPAI AUTOMATION INSTR ENGCO +1
Gear defect detection method and system based on computer vision
ActiveCN102914545AMeet the functional requirements of routine parametric measurementsMeet the functional requirements of the measurementOptically investigating flaws/contaminationUsing optical meansImaging processingNoise reduction
The invention relates to the technical field of image processing and provides a gear defect detection method and system based on computer vision. The method comprises the following steps of: acquiring a source image of a detected gear acquired by an image acquisition card through a peripheral component interconnect (PCI) slot; performing preprocessing operation comprising grey level transformation, filtering and noise reduction and threshold segmentation on the source image of the detected gear, and obtaining gear parameters of the detected gear; and performing morphological parameter analysis on the gear parameters of the detected gear, and acquiring an analysis result of the teeth where the defects possibly exist. The gear defect detection method is high in measurement speed and high in precision, the functional requirements of the conventional gear parameter measurement are met, the production efficiency and production automation degree can be greatly improved in the large-scale industrial production process, the measurement precision requirement in the actual production can be met, the measurement time is only several seconds, the requirement on the measurement speed in industrial measurement can be met, and the method has high theoretical and practical values.
Owner:WEIFANG UNIVERSITY
System for monitoring photovoltaic battery pack string
InactiveCN102109578AReduce usageGuaranteed electrical conductivityElectric devicesCurrent/voltage measurementMicrocontrollerEngineering
The invention relates to a system for monitoring a photovoltaic battery pack string and belongs to the field of running and management of a photovoltaic power generation system. In a photovoltaic power station, photovoltaic battery packs are connected in series and then are connected with a header box according to specific conditions, photovoltaic battery pack strings are connected in parallel, and the header box is connected with a grid-connected inverter. When the typical problems of connection, dust accumulation, component obsolescence difference and the like in a photovoltaic battery occur, the efficiency of the photovoltaic power generation system is influenced, and a monitoring system is needed to be arranged in the header box to monitor the photovoltaic battery pack string. The monitoring system can effectively manage the photovoltaic power station by acquiring photovoltaic pack string parameters, and combining other system parameters of the power station to realize autodiagnosis and effectively identify the problem of the power station. The system comprises a singlechip system, a power supply circuit, a voltage detection circuit, a current detection circuit, an intelligent communication interface circuit, an electrical meter chip and the like. In the system, a large-scale integrated circuit is used, and the system has a small volume, is low in energy consumption, has high reliability, and realizes the capacity of continuously monitoring the photovoltaic pack string in the life of the photovoltaic power generation system when assembled in the photovoltaic header box.
Owner:叶明宝
Method and instrument capable of accurately measuring thickness of ultrathin workpieces
InactiveCN101614533AReal-time acquisitionImprove performanceUsing subsonic/sonic/ultrasonic vibration meansUltrasonic thickness measurementCommunication interface
The invention provides a method capable of accurately measuring the thickness of ultrathin workpieces. As the ultrasonic information representing workpiece thickness is extracted by adopting a signal processing method, the invention is suitable for the ultrasonic thickness measurement technique for both ultrathin large-curvature workpieces and common workpieces, and the core of the invention is to perform fast Fourier transform on received echo signals so as to obtain measurement results. An instrument using the method capable of accurately measuring the thickness of ultrathin workpieces consists of a probe part and a host computer part, wherein the host computer part comprises a DSP control module, an ultrasonic transmitting circuit, an ultrasonic signal-receiving circuit, a signal amplification circuit, a gate circuit, a communication interface, an LCD display and a keyboard. The invention has the advantages of suitability for the thickness measurement of both ultrathin large-curvature workpieces and common workpieces, capability of acquiring ultrasonic echo signals in real time, real-time fast Fourier transform, real-time calculation and storage of pipe wall thickness and capability of realizing mechanized automatic measurement.
Owner:INST OF METAL RESEARCH - CHINESE ACAD OF SCI
Landslide MIMO radar monitoring system and monitoring method
ActiveCN104991249AFast data collectionAdjustable arrayRadio wave reradiation/reflectionTime delaysData acquisition
Owner:GUILIN UNIV OF ELECTRONIC TECH
Improved shutter delay measurement system
InactiveCN103336405ANo manual reading requiredMeet the requirements of measurement accuracyPhotographyShootComputer module
The invention relates to an improved shutter delay measurement system which is characterized by comprising a to-be-measured camera, a controllable switch, a central processing unit and a control display module, wherein the central processing unit comprises an analog-to-digital converter and a counter; the controllable switch is positioned between a shutter release of the to-be-measured camera and a central processing unit; the central processing unit is connected with the control display module; the analog-to-digital converter is connected with an exposure synchronous signal end of the to-be-measured camera; the control display module gives a shooting instruction; after receiving the instruction of the control display module, the central processing unit controls the controllable switch to allow the to-be-measured camera to shoot; the counter is started at the moment; a synchronous signal is fed back to the central processing unit after the to-be-measured camera shoots; the counter stops counting at the moment, and transmits a count value to the control display module for processing and displaying; the delay and shutter time of each to-be-measured camera can be measured according to the count value; and the count frequency can be changed by changing a count cycle value of the central processing unit through software, that is the measurement precision of a camera shutter is changed.
Owner:INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
WMPS network layout optimizing method based on simulated annealing particle swarm optimization
InactiveCN105203106AHigh precisionAchieve coverageNavigational calculation instrumentsParallel computingSimulation based
The invention provides a wMPS network layout optimizing method based on simulated annealing particle swarm optimization. A measuring station layout optimizing aim is one of important aims in use of a wMPS. The method aims at achieving the aim that due to the optimized measuring station layout, a to-be-measured region can be comprehensively covered with certain cost, and the requirement for measuring accuracy can be met. According to the wMPS network layout optimizing method, a reasonable positioning error model is built, a multi-objective optimization function is defined, and the network layout of the wMPS is optimized with the simulated annealing particle swarm optimization. The measuring-station network optimized layout aim of the wMPS in engineering application is effectively achieved through the rapid convergence capacity of the particle swarm optimization and the global convergence capacity of the stimulated annealing algorithm. Along with increasing of the number of measuring stations, the method has good expansibility and can provide a novel method with high adaptability for the multi-station networking measuring layout optimizing aim based on an angle intersection principle, and important theoretical value and practical significance are achieved.
Owner:HUBEI UNIV OF TECH
Calibrating method for CCD (Charge Coupled Device) imaging lateral laser radar
InactiveCN103149560AAvoid errorsGuaranteed accuracyWave based measurement systemsCcd cameraRadar equation
The invention discloses a calibrating method for a CCD (Charge Coupled Device) imaging lateral laser radar. The method comprises the following steps of: enabling an optical axis (1) of a CCD camera to be vertical to the plane of a calibration table (2), firstly acquiring a CCD image of the calibration table (2) by use of the CCD camera (3), and then calculating the offset angle (alpha) and angle width (d alpha) of each pixel according to a table number in the CCD image of the calibration table (2) and a pixel number with a same dimension as the table number increment in the table; and after placing the CCD camera (3) at the lateral adjacent part of an emitted light beam (5) of the laser radar, firstly determining the vertical distance(D) between the CCD camera (3) and the emitted light beam (5) of the laser radar by adopting a three-point positioning method, then substituting the offset angle (alpha) and angle width (d alpha) of each pixel as well as the vertical distance (D) between the CCD camera (3) and the emitted light beam (5) of the laser radar into a lateral laser radar equation P(alpha)=P0KA / D *TtTrbeta(alpha)dalpha, and performing inversion calculation by use of the offset angles (alpha), the angle widths (d alpha) and the vertical distance (D) so as to obtain atmospheric parameters. The calibrating method disclosed by the invention is high in measurement accuracy and wide in application range, and can be widely used for measuring the spatial distribution of atmospheric aerosol of a surface layer.
Owner:中国人民解放军陆军军官学院
Leveling method suitable for compound level gauge
ActiveCN103115610AEnsure high precision levelingAccurate measurementHeight/levelling measurementAccuracy and precisionChemistry
Owner:DALIAN SENBIOR SURVEYING INSTR TECH CO LTD
Survey station layout intelligent optimization method of spatial measurement positioning system
ActiveCN105069240AImprove global convergenceFast convergenceSpecial data processing applicationsNetwork measurementEngineering
A survey station optimization deployment problem is one of important problems in use of a spatial measurement positioning system. The present invention provides a survey station layout intelligent optimization method of a spatial measurement positioning system, so that an optimized survey station layout can fully cover a tested area under certain costs and a requirement of measurement accuracy can be met. According to the present invention, a proper positioning error model is established from three aspects of constraint analysis, optimization objective, and optimization means, a multi-goal optimizing function is defined, and survey station layout optimization of the spatial measurement positioning system is implemented by using a practical intelligent optimization algorithm. According to the survey station layout intelligent optimization method of a spatial measurement positioning system, a survey station network optimization deployment problem of the spatial measurement positioning system in an engineering application is effectively resolved. As a quantity of survey stations increases, the method has good expansibility, provides a new method for a multi-station networking measurement layout optimization problem based on an angle intersection principle, and has important theoretical value and practical significance.
Owner:LINGYUN GROUP WUHAN
Wireless inclinometer while drilling
The invention relates to a wireless inclinometer while drilling, which comprises a measuring nipple skeleton. The wireless inclinometer while drilling additionally comprises a gyroscope set which is arranged on the measuring nipple skeleton. The invention provides the wireless inclinometer while drilling which has the advantages that the measurement accuracy is high, the noise interference and the random drift of gyroscopes can be eliminated and the application scope of the instrument can be widened.
Owner:XIAN SITAN INSTR
Track geometrical parameter measurement method based on INS/GNSS and total station instrument combined use
ActiveCN105155372AGive full play to high efficiencyImprove continuityMeasuring apparatusContinuous useCombined use
The invention provides a track geometrical parameter measurement system and method based on INS / GNSS and total station instrument combined use. The system comprises a T-shaped vehicle body assembly, an INS / GNSS inertial sensor assembly / navigation satellite receiving antenna mobile station assembly, a navigation satellite receiving antenna base station assembly, a total station instrument assembly, a reflecting mirror assembly, a track gauge measuring assembly, a high-precision mileage metering assembly and a measurement system control computer assembly. According to the track geometrical parameter measurement system and method provided with the structure and based on INS / GNSS and total station instrument combined use, in a measurement interval, a total station instrument measurement method and an INS / GNSS measurement method are alternately used in all measurement segments. The total station instrument is used at the starting point and the terminal point of each measurement segment, and absolute geometrical parameter measured values of two points of a track are provided; an INS / GNSS is continuously used in each measurement segment, and relative geometrical parameter measured values between two points of each segment are provided; the measured values of the total station instrument and the measured values of the INS / GNSS are seamlessly connected; and the two-point absolute geometrical parameter measured values of the total station instrument serve as an integrity constraint of the INS / GNSS in each segment, and it is guaranteed that the INS / GNSS can meet the measurement precision requirement in the segment.
Owner:北京星网宇达科技股份有限公司
Solar sail spread structure dynamic characteristic in-orbit identification method based on binocular vision measurement
ActiveCN106408570ARealize full field monitoringImprove recognition accuracyImage enhancementImage analysisCamera lensFull field
The invention discloses a solar sail spread structure dynamic characteristic in-orbit identification method based on binocular vision measurement in order to solve the technical problem that the existing solar sail spread structure dynamic characteristic in-orbit identification method has small field of view for single measurement and is difficult to implement. The technical scheme is as follows: two cameras are used as vision sensors, vibration displacement information of a structure is extracted directly from images by use of image processing, digital image correlation, sub-pixel positioning and other methods, the dynamic characteristics of the structure are acquired in real time through an operational modal analysis technology, and thus, in-orbit identification of the dynamic characteristics of the structure is realized, and high identification precision is achieved. The cameras are fixed on a camera support fixedly connected with a solar sail spacecraft structure, and the structure of the whole sail surface can be monitored in an all-round way by finely tuning the locations and directions of the camera lenses. The method is easy to implement.
Owner:西北工业大学太仓三角研究院
Five-degree of freedom heterodyne grating interferometry system
ActiveCN108627099AEasy to handleImprove measurement efficiencyInterferometersUsing optical meansLithographic artistDegrees of freedom
Owner:TSINGHUA UNIV +1
Surface structured light active vision based dynamic automobile body morphology reconstruction system
InactiveCN104101309ASmooth and Controlled MovementAvoid vibrationUsing optical meansEngineeringStationary state
The invention discloses a surface structured light active vision based dynamic automobile body morphology reconstruction system which aims at solving the problem that the automobile morphology active vision measurement on automobiles cannot be achieved through the surface structured light in the stationary state. The surface structured light active vision based dynamic automobile body morphology reconstruction system is mainly formed by a base (1), a lead screw (3), a stepper motor (8), a camera (10), a line projection instrument (15), a right proximity switch (18), a left proximity switch (19), a computer (20), an IO card (21), a switch power supply (22), a stepper motor driver (23), a left relay (24), a right relay (25) and the like. The surface structured light active vision based dynamic automobile body morphology reconstruction system is smooth in scanning, simple in structure, high in detection accuracy, convenient to operate, easy to install, low in cost and reliable in performance.
Owner:JILIN UNIV
Open-close type current and voltage transformer
InactiveCN102360900AEasy to combineGood and reliable contactTransformersTransformers/inductances coils/windings/connectionsEngineeringInstrument transformer
The invention discloses an open-close type current and voltage transformer which comprises a current transformer and a voltage sampler, wherein the voltage sampler is mounted on one side of the current transformer through a T-shaped bulge and a T-shaped groove on the side surface of the current transformer, and the relative positions of the current transformer and the voltage sampler can be determined through two fixing pieces and the bulge on the current transformer. As an upper housing and a lower housing of the current transformer comprise mounting holes which can be fastened by using nuts and screw rods, thereby being convenient to enable the upper housing and the lower housing to form a closed combined whole during the use. The whole current and voltage transformer can be combined by adopting the screw rods and the nuts, thereby simultaneously having the function of sampling voltage signals. A groove structure is adopted at the joint of two C-shaped iron cores and matched with a resin housing with orthogonal grooves, the connection is reliable, the good closing of a magnetic circuit is ensured and the requirements on the measurement precision can be met.
Owner:DALIAN UNIV OF TECH
Underwater high-precision measurement and control system and method for pipe abutment in the construction of immersed tunnel
InactiveCN104913769AMeet the requirements of measurement accuracyNot affectedPosition fixationSurveying instrumentsIndustrial PCEngineering
The invention discloses an underwater high-precision measurement and control system and method for pipe abutment in the construction of an immersed tunnel. The system comprises multiple groups of receiving / emission ultrasonic sensors, an industrial PC control platform, a serial / wireless network communication system, a command room PC control and display platform. The multiple groups of receiving / emission ultrasonic sensors are connected with the industrial PC control platform through coaxial cable; and the industrial PC control platform and the command room PC control and display platform are connected through a serial / wireless network communication system. The invention also provides a measurement and control method. The measurement system provided by the invention has the advantages of low cost, high precision, strong adaptability, high degree of intelligence and good reliability, and can effectively solve the problem of high-precision measurement and control of underwater pipe abutment in the construction of immersed tunnel.
Owner:上海海科工程咨询有限公司 +1
Space general position and orientation measurement standard of machine vision measurement system
InactiveCN103292700AAchieve testIncrease productionUsing optical meansFeature completeMachine vision
The invention discloses a space general position and orientation measurement standard of a machine vision measurement system, and aims to solve the problem that verification on measuring results of objects in general positions and orientations in space of the machine vision measurement system cannot be realized. A three-way linear guide rail and a two-way curved guide rail are utilized to enable a standard target to reach optional position angles in the space. The system has the advantages of simple structure, high accuracy in measurement, small accumulative errors, completeness in functions, convenience in operating and the like. The system comprises a position adjusting part (A) and an orientation adjusting part (B). By the aid of the space general position and orientation measurement standard, the verification on space general position and orientation measuring results of the machine vision measurement system is realized.
Owner:JILIN UNIV
Verification system for vehicle-mounted pavement primary crack acquisition system based on line structured light reference
InactiveCN104452556AAchieve full verificationIncrease productionRoads maintainenceStructure of Management InformationRoad surface
The invention discloses a verification system for a vehicle-mounted pavement primary crack acquisition system based on line structured light reference, which aims at solving the problem that verification of the vehicle-mounted pavement primary crack acquisition system based on line structured light reference cannot be realized. The system comprises a height lifting adjusting platform (1), a target plate (2) and a wedge-shaped pad (3). According to the system provided by the design, the height and the angle can be respectively adjusted by virtue of the height lifting adjusting platform (1) and the wedge-shaped pad (3), and the vehicle-mounted pavement primary crack acquisition system based on line structured light reference is further verified.
Owner:JILIN UNIV
Quick positioning construction device and construction method for steel-pipe column of bridge
InactiveCN103061249AMeet the requirements of measurement accuracyGood construction performanceBridge structural detailsBridge erection/assemblyArchitectural engineeringScrew thread
The utility model discloses a quick positioning construction device for steel pipe columns of bridges. The quick positioning construction device for steel pipe columns of bridges comprises hook-shaped anchor bolts, screw threads are formed on the top of the anchor bolts, and screw nuts are arranged on the screw threads. The utility model also discloses a quick positioning construction method for steel pipe columns of bridges. The quick positioning construction method for steel pipe columns of bridges includes the following steps: embedding the anchor bolts before pouring concrete over the steel pipe pile foundation; making the bottom surface of the steel pipe pile foundation level by using mortar to install a prefabricated strip foundation, the strip foundation and the anchor bolt are on the same axis; leveling the level adjustment screw nuts on the anchor bolts by levels; hoisting and arranging the steel pipe columns of welded flange plates in place, and the welded flange plates are fixed with the anchor bolts through height adjustment screw nuts; the seam at the bottom of the flange plates are filled by mortar of the railway bridge bearings. The quick positioning construction device for steel pipe columns of bridges uses the anchor bolts to position, screw nuts to adjust the perpendicularity of the steel pipe columns and temporary anchorage.
Owner:QINGDAO HAIDE ROAD & BRIDGE ENG +1
Camera three-dimensional truss calibrating target for automotive visual detection system
InactiveCN104101299AEasy to carryReduce difficultyImage analysisUsing optical meansVisual perceptionMachining
The invention discloses a camera three-dimensional truss calibrating target for an automotive visual detection system. The camera three-dimensional truss calibrating target for the automotive visual detection system aims at solving the problems that the existing three-dimensional calibrating object is large in size and complex in machining, cannot obtain three-dimensional data points of spatial general positions in a space coordinate system and is difficult to achieve site calibrating which is high in requirement for practicability. The camera three-dimensional truss calibrating target for the automotive visual detection system is mainly formed by target balls (1) and connecting rods (2). The camera three-dimensional truss calibrating target for the automotive visual detection system has the advantages of being simple in structure, high in detection accuracy, small in accumulative error, complete in function, simple in operation, easy to install, strong in universality, low in cost and reliable in performance and satisfying an automotive detection industry requirement for visual detection of an automobile body.
Owner:JILIN UNIV
Automobile wheel rim appearance arcuate path visual reconstruction system
InactiveCN105928471ARealize arc trajectory scanning reconstructionImprove detection accuracyUsing optical meansSmall footprintEngineering
The invention discloses an automobile wheel rim appearance arcuate path visual reconstruction system. The system comprises a gear (1), a motor (2), a clamp (3), a laser demarcation device (4) and an arcuate rail (5). A round hole in the gear (1) passes through an output shaft of the motor (2) and is in key joint with a stepped shaft intermediate section of the motor (2). A nut is in fixed threaded connection with the end part of the output shaft of the motor (2). The gear (1) is placed in the arcuate rail (5) and is engaged with an arcuate rack of the arcuate rail (5). The laser demarcation device (4) is placed between two threaded holes in the top of the motor (2). Two bolts run into round holes on both sides of the clamp (3) and two threaded holes in the top of the motor (2) to be in fixed threaded connection with the motor (2). The system provided by the invention has the advantages of small footprint, simple structure, high detection precision, easy operation and easy installation.
Owner:JILIN UNIV
Method for embedding optical fiber sensors in aircraft cabin
ActiveCN103837333AEasy layoutGood environmental adaptabilityOptical apparatus testingOptical fiber connectorFiber optic sensor
Disclosed is a method for embedding optical fiber sensors in an aircraft cabin. A plurality of longitudinal grooves and a plurality of transverse grooves are formed in the surface of the aircraft cabin in advance, longitudinal cabin inlets are reserved in the two ends of the aircraft cabin, transverse cabin inlets corresponding to the transverse grooves one to one are formed in the circumference of the aircraft cabin, the multi-path optical fiber sensors are distributed in the multiple longitudinal grooves and the transverse grooves, the grooves are filled with glue and fixed, and then the optical fiber sensors can be embedded in the surface of the aircraft cabin. The multi-path optical fiber sensors pass through the corresponding longitudinal cabin inlets and the transverse cabin inlets, then enter the aircraft cabin, are gathered at the two ends of the cabin to form optical fiber bundles, are integrated to an optical fiber connector and then are connected with an information collection device or communicated with an adjacent cabin. By the method, the optical fiber sensors can be embedded in the surface of a single-cabin or multi-cabin butt joint type aircraft, an optical fiber sensing and detecting network is achieved, the mechanical property and damage situations of the aircraft cabin can be monitored comprehensively, and the method has the advantages that reliability is high and operation is easy.
Owner:BEIJING AEROSPACE TIMES OPTICAL ELECTRONICS TECH
Method and device for designing multi-channel receiver of double-base satellite-borne SAR system
ActiveCN110488284AHigh precision amplitude and phase consistencyMeet the measurement accuracy requirementsRadio wave reradiation/reflectionRadio frequencyPhase shifted
The invention belongs to the technical field of multi-channel receivers of synthetic aperture radar systems, and discloses a method and a device for designing a multi-channel receiver of a double-basesatellite-borne SAR system. According to the method and the device for designing a multi-channel receiver of a double-base satellite-borne SAR system, eight receiving channels are included, and a + / -5V power supply and a serial control signal are provided for each radio frequency receiving channel through a power supply conversion unit and a control distribution unit in a unified mode. Each radiofrequency receiving channel can independently complete the functions of low noise amplification, MGC, intermediate frequency amplification, balanced phase shift compensation output and the like of radar echo signals, every two receiving channels are output through cross backup, and imaging indexes of a whole radar system are influenced by amplitude-phase consistency performance indexes of every two receiving channels. The method and the device for designing a multi-channel receiver of a double-base satellite-borne SAR system have the outstanding advantages that: 1, the multi-channel receiveris adopted to better meet the working requirements of a new system of high-resolution and wide-swath satellite-borne SAR; and 2, the amplitudes and the phases of the receiving channels are compensatedthrough an equalization phase shifter and a microstrip power division power combiner, the amplitude consistency among the channels reaches 0.4 dB, and the phase consistency reaches 2 degrees.
Owner:INST OF ELECTRONICS CHINESE ACAD OF SCI
Diamond ball head grinding wheel electric sparkle dressing cutter adjustment method based on two-time cutter adjustment process
InactiveCN101623847AImprove surface accuracyMeet the surface accuracy requirementsAbrasive surface conditioning devicesGrinding wheelFace shape
The invention discloses a diamond ball head grinding wheel electric sparkle dressing cutter adjustment method based on two-time cutting tool process, and relates to a ball head grinding wheel electric sparkle dressing cutter adjustment method. The purpose of the invention is to improve the accuracy of cutter adjustment in dressing a grinding wheel, so as to improve the surface shape accuracy of the diamond ball head grinding wheel which is dressed. The main technical core of the invention is: firstly, the relative mounting positions of a grinding wheel spindle and a electrode spindle are precisely adjusted before grinding wheel dressing, so that the axial lines of the grinding wheel spindle and the electrode spindle form an angle of to 45 degrees and intersect at a point; secondly, first-time cutter adjustment is performed on a small-diameter diamond ball head grinding wheel, and the grinding wheel is dressed for the first time; finally, two newly formed edge feature points of the grinding wheel are selected to realize the second cutter adjustment of the small-diameter diamond ball head grinding wheel. The second cutter adjustment after the first cutter adjustment can effectively eliminate the influence of manufacturing errors of the grinding wheel and judgment errors of the edge feature points on the cutting tool accuracy; under the same conditions, the two-time cutter adjustment process can reduce cutter adjustment errors by 30% to 70%.
Owner:HARBIN INST OF TECH
Phase pulse-type laser range finding method
ActiveCN105487080ALow costStrong anti-interference abilityElectromagnetic wave reradiationPhysicsLaser ranging
The invention discloses a phase pulse-type laser range finding method. The method includes the following steps: S1, obtaining a first phase difference [phi]F1 of various frequency components among first emission pulse signals with the frequency of F1MHz, and obtaining a second phase difference [phi]F2 of various frequency components among second emission pulse signals with the frequency of F2MHz; S2, conducting difference operation on the first phase difference and the second phase difference, and obtaining a phase difference [phi]0 of target modulation frequencies, wherein [phi]0=[phi]F2-[phi]F1; and S3, substituting [phi]0 into a range finding formula L=C / 2[phi]0, and obtaining a corresponding laser range finding distance L. According to the method, a duty ratio of both the first emission pulse signals and the second emission pulse signals is 5%-10%, 5MHz<F1<20MHz, and 5MHz<F2<20MHz. The method has the advantages that the cost is low, the anti-interference capability is high, and the measuring speed is fast.
Owner:米德克传感器(上海)有限公司
Self-adaptive control method and apparatus for inquiry frequency of secondary surveillance radar
InactiveCN105242265AHigh measurement accuracyMeet the requirements of measurement accuracyRadio wave reradiation/reflectionSecondary surveillance radarControl objective
The invention provides a self-adaptive control method and apparatus for the inquiry frequency of secondary surveillance radar. The method includes the steps: a, initializing the maximum inquiry frequency Max, and setting the current inquiry frequency n=1; b, conducting the n inquiry for a target, and obtaining a measured target direction value during the n inquiry; c, calculating the average uncertainty of target direction values measured during the previous n times of inquiry, determining whether the average uncertainty is smaller than a preset threshold, stopping target inquiry if the average uncertainty is smaller than the preset threshold and taking the average value of the previous n times of target direction values as a final target direction value, and performing the step d if the average uncertainty is not smaller than the preset threshold; and d, determining whether the current inquiry frequency n is greater than the maximum inquiry frequency Max, taking the average value of the previous n times of target direction values as a final target direction value if the current inquiry frequency n is greater than the maximum inquiry frequency Max, otherwise, adding 1 to the current inquiry frequency n and going back to the step b. According to the method, the measurement precision of a target direction value can be ensured, the target inquiry frequency can be controlled in a self-adaptive manner, and signal crosstalk and interference in a system can be minimized.
Owner:SICHUAN JIUZHOU ELECTRIC GROUP
Correction method of flow measurement properties of single-track ultrasonic water meter
ActiveCN102538913AMeet measurement accuracy requirementsCalculation is simple and fastTesting/calibration apparatusEnvironmental geology
The invention discloses a correction method of flow measurement properties of a single-track ultrasonic water meter. The correction method comprises the following steps: 1) respectively calculating surface average flow speeds when a reynold number is an upper limit value of a laminar flow state, a lower limit value of a turbulent flow state and the upper limit value of flow measurement of the water meter; 2) calculating linear average flow speeds corresponding to the surface average flow speeds according to an existing known calibration equation; 3) establishing fitted linear correction equations during the laminar flow state, a transition flow state and the turbulent flow state; and 4) measuring the linear average flow speed Nu through the ultrasonic water meter, comparing Nu with V1 and V2 and performing correction according to the appropriate fitted linear correction equation according to a comparison result. According to the correction method disclosed by the invention, the correction is performed on the flow measurement properties of the ultrasonic water meter by setting the simple linear correction equations under the different flow speed distribution states, and the calculation is simple and fast; and furthermore, the requirements on measurement accuracy of the ultrasonic water meter within a whole flow measurement range can be met by fine adjustment of 2-3 flow points under an actual flow state, and the effects of simplicity, convenience and accuracy can be also achieved.
Owner:NINGBO WATER METER
Laser coaxiality detection device and method
PendingCN109443253ACompact structureReduce processing costsUsing optical meansTarget surfaceLaser target
The invention discloses a laser coaxiality detection device and method. The laser coaxiality detection device comprises an off-axis parabolic reflector, a laser target, an object side telecentric lens, a CCD camera, and an image processing computer; the off-axis parabolic reflector is used for concentrating an incident beam to obtain a concentrated beam, and transmitting the concentrated beam to the laser target; the laser target placed at the focus position of the off-axis parabolic reflector is used for receiving the concentrated beam to form a spot; and the CCD camera provided with the object side telecentric lens is used for photographing the target surface of the laser target so as to acquire a spot image; and the image processing computer is used for processing the spot image. With the above technical schemes of the present invention adopted, the laser coaxiality detection device and method can meet measurement accuracy requirements, and has the advantages of low cost and simplepracticality.
Owner:北京国泰蓝盾科技有限公司
Plane mirror positioning device capable of adjusting position
InactiveCN101979906AEasy to adjustGuaranteed levelStands/trestlesUsing optical meansPlane mirrorPhysics
The invention discloses a plane mirror positioning device capable of adjusting the position, and belongs to the field of industrial measurement. The plane mirror positioning device aims to solve the problem that the installation position of a plane mirror cannot be positioned and adjusted accurately. The system comprises a support (1), a first support pillar (2), a plane mirror (3), a first positioning knob (4), an upper support (5), a second positioning knob (6), a first adjustment nut (7), a third positioning knob (8), a level bubble (9), a second adjustment nut (10), a fourth positioning knob (11) and a second support pillar (12). The detection system can adjust the position of the plane mirror quickly and accurately.
Owner:JILIN UNIV
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