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46results about How to "Meet different measurement needs" patented technology
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Ophthalmology oct system and ophthalmology imaging method
ActiveCN102438505ASimple structureEasy to operateMaterial analysis by optical meansEye diagnosticsFixation pointImaging quality
The embodiment of the invention discloses an ophthalmology OCT system, comprising a posterior segment intraocular OCT imaging system and an anterior eye segment OCT imaging system. The posterior segment intraocular OCT imaging system comprises a light path conversion device, the anterior eye segment OCT imaging system comprises an anterior eye segment probe imaging device comprising an ophthalmoscope, a first dichroscope and a first lens; wherein, when the ophthalmology OCT system carries out an anterior eye segment scanning imaging, and after the light path conversion device receives a light path conversion instruction, signal light passing through a collimating mirror and a scanning device respectively are converted to the anterior eye segment probe imaging device; the anterior eye segment probe imaging device drives the first dichroscope to reflect the signal light to the ophthalmoscope to carry out the anterior eye segment scanning imaging. Correspondingly, the invention also discloses an ophthalmology OCT imaging method. By employing the invention, when the anterior eye segment imaging is carried out on human eye, fixation points can always be kept clear via refractive compensation, and the anterior eye segment probe imaging quality is not affected.
Owner:SHENZHEN CERTAINN TECH CO LTD +1
Calibration device of laser alignment device and method for measuring indication errors of laser alignment device through calibration device
The invention discloses a calibration device of a laser alignment device and a method for measuring indication errors of the laser alignment device through the calibration device. The calibration device comprises two mutually independent rotation shafts capable of rotating for 360 degrees. One of the rotation shafts is used as a reference shaft and the other rotation shaft is capable of moving, pitching and deflecting in the horizontal direction and vertical direction. By setting the rotation angles of the rotation shafts, and adjusting the horizontal and vertical displacement quantity, pitching quantity and deflection quantity of the other rotation shaft, measurement of the displacement quantity in the horizontal and vertical directions, the rotation angle quantity of an inclinometer and indication errors of alignment deviation of a position sensitive sensor of the laser alignment device can be achieved. According to the invention, operation states of the laser alignment device in actual working processes can be precisely simulated; the standard alignment deviation quantity of measurement shafts can be displayed in a real-time and direct manner; calibration results are quite precise; and operability of the measurement process is quite high.
Owner:广东省计量科学研究院(华南国家计量测试中心)
Device for monitoring states and diagnosing faults of coal mine underground working surface conveyer
InactiveCN101727085AEasy to expand monitoring volumeSimple structureComputer controlSimulator controlEngineeringCrusher
The invention discloses a device for monitoring conditions and diagnosing faults of a coal mine underground working surface conveyer, which consists of a state monitoring and fault diagnosis central station and a substation, uses PLC for control, adopts a modularization design, and supports multi-bus data transmission. The device realizes the real-time monitoring and display of the following parameters: the bearing temperature, the oil temperature and the oil level of a speed reducer matched with the devices of a working surface conveyer namely a slat conveyer, a reversed loader, a crusher and the like; the stator temperature and the rotor bearing temperature of a motor; and the flow and the pressure of cooling water, and the distance between a coal mining machine and the slat conveyer, and the like. The device diagnoses the running states of the conveyer and makes an early warning or an alarm. The device can meet different requirements underground a coal mine, has the advantages of simple structure, convenient maintenance and expansion, convenient and fast network deployment and the like, reaches the aims of performing long-distance and on-site real-time monitoring and fault diagnosis on the working surface conveyer, and realizes the production target of safe, stable and reliable operations in a coal mine.
Owner:TAIYUAN UNIV OF TECH
Measuring method of little opening displacement of microcrack
InactiveCN101608905AHigh measurement accuracyMeet different measurement needsUsing optical meansStrength propertiesLength waveMeasurement precision
The invention discloses a measuring method of little opening displacement of microcrack, belonging to the technical fields of photo mechanics, structural member deformation, displacement measurement and the like. The invention adopts a measuring system mainly consisting of a laser device, a loading device, a test specimen with a microcrack, a light intensity receiving screen and a pattern collecting system. During measurement, laser sends out light with a wave length of lambda; a Fraunhofer diffraction fringe pattern is formed on the receiving screen by the microcrack; an initial light intensity pattern of the microcrack is obtained by the pattern collecting system; the loading device is used for slowly loading the test specimen to open the microcrack; the pattern collecting system is used for recording multiple slit diffraction light intensity patterns of the microcrack on the receiving screen under different loads; digital pattern analysis and relative operation are carried out according to a light intensity pattern so as to finally obtain the little opening displacement amount of the microcrack under different loads. The method has the characteristics of convenient use, high measurement precision and the like. The deformation amount measurement of the microcrack can reach 100 mu epsilon magnitude, and the displacement measurement sensitivity can reach wavelength magnitude.
Owner:TSINGHUA UNIV
Method for generating light field with sine structure by means of space-time binary encoding
ActiveCN104567730AImprove sinusoidalityHigh-speed and high-precision 3D surface shape measurementUsing optical meansNon linear responseGray level
The invention belongs to the three-dimensional sensing technology and discloses a method for generating a light field with a sine structure by means of space-time binary encoding. According to the method, a standard sine fringe pattern 1 generated by a computer is equally divided into 2<n> (n>=2) sections according to gray-level distribution, then time and space encoding is conducted on each section by means of two-dimensional error diffusion to obtain 2<n> (n>=2) binary fringe patterns (2, 3, 4, ..., 5), and then linear superposition is conducted on the binary fringe patterns after the binary fringe patterns are projected and acquired through an imaging system, so that a high-quality sine fringe 6 is obtained. The projected binary fringe patterns are not affected by the non-linear response of a digital projector, the high-speed binary pattern switching function of the digital projector is fully utilized, and the speed and precision of three-dimensional surface measurement are improved.
Owner:SICHUAN UNIV
Heterodyne one/two-dimensional raster-displacement coarse/fine measurement system
ActiveCN106052569AGuarantee normal productionMeet different measurement needsUsing optical meansBeam splitterGrating
The invention discloses an heterodyne one / two-dimensional raster-displacement coarse / fine measurement system. The system comprises a single frequency laser light source, an electrooptic modulator, a one-dimensional reflection measurement raster, a beam splitter prism, five one-dimensional transmission measurement raster, six plane mirrors, four polarization splitting prisms, eight polaroids and eight photoelectric detection and signal processing components. The single frequency laser light source emits linear-polarization single frequency laser, a polarization direction and an x axis form 45 degree, the laser is modulated by the electrooptic modulator which is parallel to the x axis via a fast-axis direction and then a heterodyne laser is output. The heterodyne laser is formed by an s wave component whose polarization direction is along an z axis and a p wave component whose polarization direction is along the x axis. A phase difference which changes along with changes of a modulation voltage loaded by the electrooptic modulator exists between the s wave component and the p wave component. By using the system of the invention, errors caused by measured environment temperature and humidity changes and the like can be overcome, coarse / fine conversion of a displacement measurement resolution at a one / two-dimensional direction can be effectively realized and different measurement demands are fully satisfied.
Owner:HARBIN INST OF TECH
Synchronous multi-parameter acquisition type self-contained hydrophone and array design method thereof
InactiveCN108007551AMeet different measurement needsIncrease flexibilitySubsonic/sonic/ultrasonic wave measurementTransducers for subaqueous useMass storageSynchronous motor
The invention provides a synchronous multi-parameter acquisition type self-contained hydrophone and an array design method thereof. The synchronous multi-parameter acquisition type self-contained hydrophone comprises a hydrophone cabin, an electronic cabin, a sensor cabin, a power supply module, a hydrophone body, a pre-amplifier unit, a band-pass filter, a differential driver, an A / D conversion unit, an SD card, a control circuit, a synchronous circuit, and a temperature pressure sensor. The power supply module provides power for the pre-amplifier unit, the band-pass filter, the differentialdriver, the A / D conversion unit, the SD card, the control circuit, the synchronous circuit, and the temperature pressure sensor simultaneously. The hydrophone has various parameters to meet differentmeasurement requirements and has functions of ultra-low power consumption, large-capacity storage, sleeping, fixed-time startup and the like to adapt to different working environments. The self-contained hydrophone has the microsecond accurate synchronization and online monitoring functions and anti-winding, quick dismounting and mounting, and hydrophone space changing characteristics; convenienceis provided for forming an array; and the application value is great.
Owner:THE 715TH RES INST OF CHINA SHIPBUILDING IND CORP
Portable thermal infrared load field calibration and water surface temperature verification system device
InactiveCN103616078AEasy to disassembleEasy to assembleRadiation pyrometrySurface measurementObservation data
Disclosed is a portable thermal infrared load field calibration and water surface temperature verification system device. A floating device is composed of a polyethylene-aluminum composite pipeline, a hard plastic tube, a basketball and a right-angle tee connector. A measuring instrument carrying platform is arranged on the top of the floating device, and an infrared radiometer KT15, a data acquisition unit and a storage battery are arranged on the platform in a carrying mode. The bottom of the carrying platform and the KT15 are wrapped by silver paper, so that the influence of infrared radiation of a measuring table itself on the observed result is reduced. By the adoption of the device, automatic observation can be achieved outdoors, long-term observation data can be stored, and the device can be placed on the water surface for measuring; the collected radiation temperature data and synchronous sounding data are simultaneously input to a radiometric calibration module which is developed in a matched mode, and the calibration coefficient can be calculated to be used for radiometric calibration of a thermal infrared sensor; meanwhile, in times of water surface measurement, due to the fact that the radiation temperature measured by the KT15 represents the water body radiation value of certain area, the water surface temperature on behalf of a certain area range can be calculated by the way of combining a matched temperature verification module, and the temperature verification module is used for verifying the remote sensing retrieval surface temperature.
Owner:INST OF GEOGRAPHICAL SCI & NATURAL RESOURCE RES CAS
Sensor module suitable for electric-conducting multiphase flow wire mesh measurement system
ActiveCN110389016AFlexible choice of quantityEasy to assemble and disassembleHydrodynamic testingFluid speed measurementComputer moduleModular design
The invention discloses a sensor module suitable for an electric-conducting multiphase flow wire mesh measurement system. The sensor module comprises a baseplate, a circuit board arranged on the baseplate, and a roof arranged on the circuit board; the shapes and the hole positions of the roof and the base plates are same; the circuit board comprises a substrate, a bonding pad and a wire mesh measurement array for sensing multi-phase flow parameters; the wire mesh measurement array is welded on the substrate through the bonding pad; the circuit board further comprises signal emitter interfaceand a signal receiver interface connected with the wire mesh measurement array; the slots matched with the signal emitter interface and the signal receiver interface are formed on the roof and the baseplate. Through the modular design, the amount of the circuit board can be flexibly selected to realize different measurement demands; the sensor module can be arranged at different locations of the flow field through flange connection, the emitting arrays and receiving arrays are mutually independent and directly connected with the corresponding interfaces, and the signal transmission is reliableand free from mutual interference.
Owner:SHANGHAI JIAO TONG UNIV
Transmission type digital holography microimaging device based on electrical-controlled switchable focus lens
The invention is suitable for the technical field of optical imaging and measuring, and provides a transmission type digital holography microimaging device based on an electrical-controlled switchable focus lens. The transmission type digital holography microimaging device based on the electrical-controlled switchable focus lens comprises a laser device, a first beam splitter, a first light path turning assembly, a second light path turning assembly, a second beam splitter and a camera, wherein the first beam splitter is used for separating laser emitted from the laser device into object light and reference light; the first light path turning assembly is used for guiding the transmitting direction of an object light spherical wave generated after the object light passes through a microobjective to the second beam splitter; the electrical-controlled switchable focus lens in the second light path turning assembly is used for changing a focal length and enabling the curvature of a reference light spherical wave formed after the reference light passes through the electrical-controlled switchable focus lens to be the same as the curvature of the object light spherical wave; the second light path turning assembly is used for guiding the transmitting direction of the reference light spherical wave to the second beam splitter; the second beam splitter is used for outputting the spherical wave; and the camera is used for recording a formed interferogram. By the device, phase distortion can be eliminated.
Owner:SHENZHEN UNIV
Digital nuclear pulse gauss shaping method based on bilinear transformation method
InactiveCN103675891AGaussian shaping implementationFlexible adjustment of parameter valuesX-ray spectral distribution measurementUnit impulseLaplace transform
The invention discloses a digital nuclear pulse gauss shaping method based on the bilinear transformation method. The digital nuclear pulse gauss shaping method includes the steps of obtaining a differential equation of system circuit input signals and system circuit output signals according to a circuit of a simulation gauss shaping system, carrying out derivation on the differential equation through Laplace transformation to obtain a system function of the simulation gauss shaping system, transforming the system function of the simulation gauss shaping system from a simulation domain to a digital domain through the bilinear transformation method to obtain a system function of a digital gauss shaping system, carrying out inverse Z-transformation on the system function of the digital gauss shaping system to obtain unit impulse responses of the digital gauss shaping system, wherein the unit impulse responses contain shaping parameters which can adjust the waveform width, selecting the shaping parameters in the unit impulse responses, determining the corresponding unit impulse responses of the digital gauss shaping system according to the selected shaping parameters, carrying out convolution summing and operation on nuclear pulse signals input into the digital gauss shaping system and the unit impulse responses of the digital gauss shaping system, and achieving digital nuclear pulse gauss shaping.
Owner:CHENGDU UNIVERSITY OF TECHNOLOGY
Heterodyne type two/three-dimensional grating displacement coarse/fine measuring system
ActiveCN106247947AGuarantee normal productionMeet different measurement needsUsing optical meansPolarizerVoltage
The invention relates to a heterodyne type two / three-dimensional grating displacement coarse / fine measuring system. The system comprises a single-frequency laser light source, an electro-optic modulator, five beam splitter prisms, a two-dimensional transmission type measuring grating, seven one-dimensional transmission type measuring gratings, six polarization beam splitter prisms, twelve polaroids, twelve photoelectric detection and signal processing components and five plane mirrors; laser emitted by the single-frequency laser light source is linearly polarized single-frequency laser, the polarization direction of the laser forming a 45-degree angle with an x axis; the laser is modulated through the electro-optic modulator of which the fast axis direction is parallel to the x axis, so that heterodyne laser can be outputted; the heterodyne laser is composed of an s wave component of which the polarization direction is along a y axis and a p wave component of which the polarization direction is along the x axis; and the s wave component and the p wave component have a phase difference which changes with the change of modulated voltage loaded by the electro-optic modulator. With the heterodyne type two / three-dimensional grating displacement coarse / fine measuring system of the invention adopted, errors caused by factors, such as ambient temperature and humidity change, can be avoided; and the coarse / fine conversion of displacement measurement resolution in two / three-dimensional directions can be realized, and different measurement needs can be fully satisfied.
Owner:HARBIN INST OF TECH
Capacitor voltage conversion circuit
ActiveCN108020727ATake up less resourcesReduce mistakesCapacitance measurementsConverting sensor output electrically/magneticallyCapacitor voltageTime-sharing
The present invention provides a capacitor voltage conversion circuit. The capacitor voltage conversion circuit comprises CPU unit, a square-wave excitation signal generation circuit, a detected capacitor (C), a synchronous digital detecting circuit, a time-sharing integrating circuit and a low-pass RC filter circuit. The CPU unit is configured to generate synchronous excitation signals and logiccontrol signals; the square-wave excitation signal generation circuit is configured to take the synchronous excitation signals as triggering signals to convert a reference level as square-wave excitation signal output configured to be applied to the detected capacitor (C) to excite the detected capacitor (C); the synchronous digital detecting circuit is connected with a returning end of the detected capacitor (C) to take the synchronous excitation signals as triggering signals to detect returning signals of the detected capacitor (C) to integration half-wave signals; and the time-sharing integrating circuit is configured to take the synchronous excitation signals as triggering signals to perform time sharing integration of the integration half-wave signals to output a direct current level.The capacitor voltage conversion circuit solves the technical problems that the capacitor voltage conversion circuit is complex in structure, limited in application range, large in error and low in detection sensitivity.
Owner:四川泛华航空仪表电器有限公司
Electrical measurement based four-point type nondestructive test probe with adaptive adjustment
InactiveCN106404843AIncreased flexibility of useSimple structureMaterial impedanceElectrical measurementsPhysics
The invention provides an electrical measurement based four-point type nondestructive test probe with adaptive adjustment. Three identical fixed electrodes of the test probe are uniformly distributed at a peripheral direction in a casing, and the electrodes are used as measuring electrodes; a movable electrode is positioned in the center of the housing and is used as an exciting electrode, the four electrodes are insulated and isolated by a filling material, and the four electrodes are connected to an external display apparatus through leads. The probe has the beneficial effects that the test probe can satisfy different measurement demands of parts with planes, recessed surfaces, and convex surfaces. The exciting electrode in the center of the probe has a movable structure, the height of the probe can be automatically adjusted according to the surface shape of the material to be detected, so that good attaching of the probe and the material to be detected is realized, and usage flexibility of the probe is improved. According to impedance between electrodes for testing and electrical characteristics of a material to be detected, the probe is suitable for nondestructive flaw detection of material components with weak conductivity, and the probe can be used for measuring materials whose conductivities are below 100000S / m; the probe has the advantages of simple integral structure, operation convenience, and good practicality.
Owner:CIVIL AVIATION UNIV OF CHINA
Device and system suitable for measuring conductivity of strip-shaped electrical material at different temperatures
ActiveCN111830326AAccurate measurementGood scope of applicationThermometer detailsResistance/reactance/impedenceElectro conductivityDigital signal processing
The invention discloses a strip-shaped electrical material conductivity measuring device and system suitable for different temperatures. The measuring device comprises a current applying mechanism, asample pressing mechanism, a measuring platform, a thermocouple and a voltage measuring mechanism. The system comprises the measuring device, a digital signal processing unit, a temperature control unit and a data acquisition unit, wherein the digital signal processing unit is respectively connected with the temperature control unit and the data acquisition unit, the measuring device is arranged in the temperature control unit and is used for controlling the temperature of the sample wafer, and a thermocouple, a current lead and a voltage lead of the measuring device are respectively connectedwith the data acquisition unit. According to the system, the type of the measured material is further expanded, and the temperature working condition is integrated into one measurement system, so conductivity measurement of various sizes and different types of strip-shaped electrical materials under the conventional condition and the condition of applying different temperatures can be realized, the measurement result is accurate, and the method has guiding significance for subsequent processes.
Owner:HEBEI UNIV OF TECH
Ophthalmology OCT system and ophthalmology OCT imaging method
ActiveCN102438505BSimple structureEasy to operateMaterial analysis by optical meansEye diagnosticsImaging qualityOphthalmoscopes
Owner:SHENZHEN CERTAINN TECH CO LTD +1
Convenient joint for four-probe method resistance measurement
ActiveCN107741511AAccurate measurementSimple structureMeasurement instrument housingElectrical resistance and conductanceMeasurement device
The invention discloses a convenient joint for four-probe method resistance measurement. In the resistance measurement process, a to-be-tested piece is fixed to a testing platform, and then measurement is performed through a measuring device. The joint comprises a support and a contact, the support is connected with a testing platform, the contact is connected with the test piece, and the supportenables the contact to be compressed on the test piece. The joint is simple in structure, accurate in measurement, capable of being flexibly designed as needed, applicable to different testing objectsand capable of being used for measuring the resistance of special-shaped test pieces and small test pieces; when the joint is connected with the test pieces, no welding is needed, and the high electrical connection stability is still achieved.
Owner:北京鼎臣世纪超导科技有限公司
Binocular vision three-dimensional point cloud reconstruction measurement method for sinusoidal grating and speckle mixed pattern projection
InactiveCN112595263AReduce false match rateImprove reconstruction accuracyImage enhancementReconstruction from projectionSinusoidal gratingPoint cloud
The invention belongs to the field of binocular vision three-dimensional measurement and precision measurement, and particularly relates to a binocular vision three-dimensional measurement method forsinusoidal grating and speckle mixed pattern projection. The method is characterized by comprising five parts of implementation based on a binocular single-projection hardware system, digital speckledesign, sinusoidal grating stripe design, speckle and stripe image fusion, pattern projection and image information extraction, and speckle and phase shift matching algorithm flow. The invention aimsto provide a rapid projection phase shift grating method for improving the reconstruction speed from two angles of a projection mode and a matching algorithm. According to the method, the unwrapping process of a traditional projection phase shift grating method and the tedious step that multiple sets of multi-step phase shift stripes need to be projected when a multi-frequency heterodyne method isadopted are avoided, compared with speckle matching, the reconstruction precision of the method is improved, the sinusoidal grating and speckle mixed pattern is projected to the measured object, andin combination with a corresponding matching algorithm, the speed and the precision of three-dimensional measurement are improved.
Owner:TIANJIN UNIV
Portable detachable amphibious spectrum detection device
PendingCN106525774AEasy assembly and disassemblyEasy to disassembleScattering properties measurementsColor/spectral properties measurementsHorizontal projectionFloating platform
Owner:TIANJIN UNIV
Numerically controlled automatic microwave imaging lens
ActiveCN110109231AReduce imaging errorsPosition is easy to controlProgramme controlComputer controlPhysicsCamera lens
The invention discloses a numerically controlled automatic microwave imaging lens comprising a first sagittal biconvex lens, a first plano-convex lens, a first convex-concave lens, a second convex-concave lens, a second plano-convex lens, a second sagittal biconvex lens and a precision displacement control system. The first sagittal biconvex lens is used for realizing microwave converging. The first plano-convex lens, the first convex-concave lens, and the second convex-concave lens work jointly to adjust the field curvature and realize zooming. The second plano-convex lens is configured to realize focusing of an imaging lens at an observation position. The second sagittal biconvex lens is used for secondary microwave converging. The precise displacement control system is configured to control the observation range and observation position of the imaging lens. According to the invention, all lens locations are located and controlled precisely by controlling the precise electric movingplatform remotely; the observation position and the observation range of the imaging lens are controllable; different measurement requirements can be met; and the imaging lens is suitable for a complicated measurement environment that is difficult to approach.
Owner:HUAZHONG UNIV OF SCI & TECH
Unmanned aerial vehicle measurement system for building monitoring
InactiveCN113358099AHigh measurement accuracyImprove environmental adaptabilityNavigation by speed/acceleration measurementsPicture taking arrangementsHardware structureReal time analysis
The invention relates to an unmanned aerial vehicle measurement system for building monitoring, a hardware structure comprises an unmanned aerial vehicle platform, a mounting sensor installed on the unmanned aerial vehicle platform, a data transmission device and a ground workstation, and the unmanned aerial vehicle platform comprises an aircraft, a flight controller and an airborne arithmetic unit. Data collected by the mounting sensor and flight control information are sent to the ground work station through the data transmission equipment, and the ground work station analyzes, processes and displays the received information in real time; and a software structure adopts a framework combining an MVC framework and an ROS framework and comprises a view layer, a model layer, a control layer and an expandable algorithm layer, and communication interaction among the layers is carried out according to an ROS communication mechanism. The system has the characteristics of high measurement precision, high environmental adaptability and capability of meeting different indoor and outdoor measurement requirements of a building in hardware configuration; and the system has strong developability and expansibility in software structure, and can improve the usability and reliability of the whole test system in a complex environment.
Owner:邓良波
A Heterodyne 2/3D Grating Displacement Coarse/Fine Measuring System
ActiveCN106247947BGuarantee normal productionMeet different measurement needsUsing optical meansBeam splitterGrating
The invention relates to a heterodyne type two / three-dimensional grating displacement coarse / fine measuring system. The system comprises a single-frequency laser light source, an electro-optic modulator, five beam splitter prisms, a two-dimensional transmission type measuring grating, seven one-dimensional transmission type measuring gratings, six polarization beam splitter prisms, twelve polaroids, twelve photoelectric detection and signal processing components and five plane mirrors; laser emitted by the single-frequency laser light source is linearly polarized single-frequency laser, the polarization direction of the laser forming a 45-degree angle with an x axis; the laser is modulated through the electro-optic modulator of which the fast axis direction is parallel to the x axis, so that heterodyne laser can be outputted; the heterodyne laser is composed of an s wave component of which the polarization direction is along a y axis and a p wave component of which the polarization direction is along the x axis; and the s wave component and the p wave component have a phase difference which changes with the change of modulated voltage loaded by the electro-optic modulator. With the heterodyne type two / three-dimensional grating displacement coarse / fine measuring system of the invention adopted, errors caused by factors, such as ambient temperature and humidity change, can be avoided; and the coarse / fine conversion of displacement measurement resolution in two / three-dimensional directions can be realized, and different measurement needs can be fully satisfied.
Owner:HARBIN INST OF TECH
A method for generating sinusoidal structured light field by spatio-temporal binary encoding
ActiveCN104567730BImprove sinusoidalityHigh precisionUsing optical meansError diffusionSpatial encoding
The invention belongs to the three-dimensional sensing technology and discloses a method for generating a light field with a sine structure by means of space-time binary encoding. According to the method, a standard sine fringe pattern 1 generated by a computer is equally divided into 2<n> (n>=2) sections according to gray-level distribution, then time and space encoding is conducted on each section by means of two-dimensional error diffusion to obtain 2<n> (n>=2) binary fringe patterns (2, 3, 4, ..., 5), and then linear superposition is conducted on the binary fringe patterns after the binary fringe patterns are projected and acquired through an imaging system, so that a high-quality sine fringe 6 is obtained. The projected binary fringe patterns are not affected by the non-linear response of a digital projector, the high-speed binary pattern switching function of the digital projector is fully utilized, and the speed and precision of three-dimensional surface measurement are improved.
Owner:SICHUAN UNIV
Apparatus and method for measuring peripheral shape of cylindrical body
ActiveCN103994730BFulfillment requirementsSimple structureUsing subsonic/sonic/ultrasonic vibration meansDiagnostic recording/measuringHuman bodyMeasurement device
Owner:NANJING STARTON MEDICAL TECH CO LTD
A portable field calibration and water surface temperature verification system device for thermal infrared load
InactiveCN103616078BEasy to disassembleEasy to assembleRadiation pyrometryMeasuring instrumentData acquisition
Disclosed is a portable thermal infrared load field calibration and water surface temperature verification system device. A floating device is composed of a polyethylene-aluminum composite pipeline, a hard plastic tube, a basketball and a right-angle tee connector. A measuring instrument carrying platform is arranged on the top of the floating device, and an infrared radiometer KT15, a data acquisition unit and a storage battery are arranged on the platform in a carrying mode. The bottom of the carrying platform and the KT15 are wrapped by silver paper, so that the influence of infrared radiation of a measuring table itself on the observed result is reduced. By the adoption of the device, automatic observation can be achieved outdoors, long-term observation data can be stored, and the device can be placed on the water surface for measuring; the collected radiation temperature data and synchronous sounding data are simultaneously input to a radiometric calibration module which is developed in a matched mode, and the calibration coefficient can be calculated to be used for radiometric calibration of a thermal infrared sensor; meanwhile, in times of water surface measurement, due to the fact that the radiation temperature measured by the KT15 represents the water body radiation value of certain area, the water surface temperature on behalf of a certain area range can be calculated by the way of combining a matched temperature verification module, and the temperature verification module is used for verifying the remote sensing retrieval surface temperature.
Owner:INST OF GEOGRAPHICAL SCI & NATURAL RESOURCE RES CAS
Three-dimensional mirror object shape measurement system based on sinusoidal stripe projection
InactiveCN102721378BMove preciselyChange frequencyUsing optical meansProjection systemPositioning system
Owner:BEIHANG UNIV
Flue gas multi-component measurement system and use method
PendingCN114608898AImprove fidelityReduce measurement errorWithdrawing sample devicesMaterial analysis by optical meansJet flowFlue gas
Owner:BEIJING GUODIAN LONGYUAN ENVIRONMENTAL ENG
Sealing ring size rechecking device with rejecting function
InactiveCN112577394ASimplify operation stepsEasy to useMechanical diameter measurementsMetal working apparatusPhysicsEngineering
The invention provides a sealing ring size rechecking device with a rejecting function. The sealing ring size rechecking device with the rejecting function comprises a base, and a supporting frame fixedly connected to the left side of the top of the base. According to the sealing ring size rechecking device with the rejecting function, by arranging the size rechecking structure, four O-shaped sealing rings of different sizes can be measured at the same time, different measurement requirements can be met, and compared with a traditional single measurement mode, the sealing ring size recheckingdevice can adapt to measurement of the four O-shaped sealing rings of different sizes at the same time, different measuring cylinders do not need to be replaced frequently, operation steps are simplified, use is more convenient, meanwhile, the threaded rotating rod is arranged to be in threaded connection with the four measuring cylinders, the measuring cylinders can be contracted, the measuring cylinders can be protected when not used, the surface of the measuring cylinder is prevented from being damaged by external environmental factors, and the measuring precision is prevented from being affected.
Owner:WUXI TEHENG TECH CO LTD
Measuring method of little opening displacement of microcrack
InactiveCN101608905BHigh measurement accuracyMeet different measurement needsUsing optical meansStrength propertiesLength waveMeasurement precision
The invention discloses a measuring method of little opening displacement of microcrack, belonging to the technical fields of photo mechanics, structural member deformation, displacement measurement and the like. The invention adopts a measuring system mainly consisting of a laser device, a loading device, a test specimen with a microcrack, a light intensity receiving screen and a pattern collecting system. During measurement, laser sends out light with a wave length of lambda; a Fraunhofer diffraction fringe pattern is formed on the receiving screen by the microcrack; an initial light intensity pattern of the microcrack is obtained by the pattern collecting system; the loading device is used for slowly loading the test specimen to open the microcrack; the pattern collecting system is used for recording multiple slit diffraction light intensity patterns of the microcrack on the receiving screen under different loads; digital pattern analysis and relative operation are carried out according to a light intensity pattern so as to finally obtain the little opening displacement amount of the microcrack under different loads. The method has the characteristics of convenient use, high measurement precision and the like. The deformation amount measurement of the microcrack can reach 100 mu epsilon magnitude, and the displacement measurement sensitivity can reach wavelength magnitude.
Owner:TSINGHUA UNIV
Optical pulse time stretching device and method and spectral measurement system
ActiveCN114660790AImprove reflectivityIncrease the number ofRadiation pyrometrySpectrum investigationFirst lightOptical measurements
The invention relates to the technical field of optical measurement, in particular to an optical pulse time stretching device and method and a spectral measurement system, and the device comprises a first reflector, a second reflector and an optical filter; a first reflecting surface of the first reflecting mirror and a second reflecting surface of the second reflecting mirror are opposite at an interval and are parallel to each other; the light filter comprises a first light filtering surface opposite to the first reflecting surface at an interval and a second light filtering surface opposite to the second reflecting surface at an interval, and the first light filtering surface and the second light filtering surface are parallel to each other; the first reflecting surface and the first light filtering surface form a first included angle A which is larger than 0 degree and smaller than 90 degrees. The optical filter is arranged between the reflector pair formed by the first reflector and the second reflector according to a certain included angle, and light pulses with different wavelengths are reflected for different times to realize time stretching. As the reflecting mirror has extremely high reflectivity on the optical pulse of the specific wave band, the generated energy loss is less, and the adjusting device can increase the number of small pulses and the dispersion amount, so that the signal-to-noise ratio of the optical pulse is improved.
Owner:SUN YAT SEN UNIV
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