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41results about How to "Improve measurement uncertainty" patented technology
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Absolute distance measurement method and system using optical frequency generator
ActiveUS20090207418A1Improve measurement uncertaintyOptical rangefindersInterferometersFrequency of useDistance measurement
The present invention relates to absolute distance measurement method and system using an optical frequency generator. The absolute distance measurement method using the optical frequency generator includes (a) generating a plurality of different stabilized wavelengths by using the optical frequency generator; (b) obtaining an initial estimation value of a distance to be measured by using a frequency sweeping interferometer; (c) analyzing an uncertainty range of the obtained initial estimation value; (d) measuring excess fraction parts of the different wavelengths by analyzing interference signals for each of the wavelengths; (e) determining integer parts for each of the different wavelengths within the uncertainty range of the initial estimation value; and (f) measuring an absolute distance to be measured by using the excess fraction part and the integer parts for each of the different wavelengths.
Owner:KOREA ADVANCED INST OF SCI & TECH
CCD device quantum efficiency measuring device and method
ActiveCN104142226AReduce line widthGood repeatabilityTesting optical propertiesQuantum efficiencyMeasurement device
The invention provides a CCD device quantum efficiency measuring device and method. The device comprises a CCD device absolute quantum efficiency measuring apparatus and a CCD device relative quantum efficiency measuring apparatus, the CCD device absolute quantum efficiency measuring apparatus is used for measuring the absolute quantum efficiency of a CCD device on a 632.8 nm wavelength point, and the CCD device relative quantum efficiency measuring apparatus is used for measuring the relative quantum efficiency of the CCD device within the wavelength range from 300 nm to 1100 nm. According to the CCD device quantum efficiency measuring device and method, a 632.8 nm laser is used for emitting light into an integrating sphere to carry out absolute calibration after the light passes through a power stabilizing system, lasers with different levels of output power can be selected according to different CCD devices, the problem that optical power is low is avoided, no light loss is caused, a standard detector directly traces the source to a low-temperature radiometer on the 632.8 nm wavelength point, and therefore the number of intermediate links is reduced, and uncertainty of measurement is improved.
Owner:THE 41ST INST OF CHINA ELECTRONICS TECH GRP
Petroleum hydrometer calibration device and method
ActiveCN102023121ARaising the bar for density measurementHigh degree of automationSpecific gravity measurementThermometerPetroleum
The invention relates to the technical field of the detection and the calibration of a hydrometer, in particular to a calibration device and method for calibrating a petroleum hydrometer. The calibration device comprises a fixed mount, a thermostatic bath and a scale, wherein the thermostatic bath is arranged in the fixed mount, the scale is arranged on the top surface of the fixed mount, a lifting rope is arranged below the scale, a glass measuring cylinder is arranged in the thermostatic bath, the glass measuring cylinder comprises a main measuring cylinder and an auxiliary measuring cylinder, the main measuring cylinder is communicated with the auxiliary measuring cylinder by a liquid level regulating device, and a thermometer is arranged in the main measuring cylinder. The invention realizes the switching among different calibration marking points of the hydrometer based on the vertical movement of the liquid level of the reference liquid, so that the liquid level of the reference liquid can be tangential to the required calibration marking point, thereby meeting the calibration requirements of the hydrometer, filling in the gap that a low-range petroleum hydrometer can not be calibrated, expanding the calibration range of the petroleum hydrometer, improving the calibration automation degree, enhancing the calibration efficiency, reducing the measuring error and improving the calibration uncertainty level.
Owner:朱茜 +2
High-accuracy middle-infrared-band absolute spectral responsivity calibrating device
InactiveCN103674250AImprove responsivenessImprove the accuracy of value transmissionSpectrum investigationMiddle infraredSignal on
The invention provides a high-accuracy middle-infrared-band absolute spectral responsivity calibrating device which comprises a middle-infrared tunable optical parametric oscillator, an acoustic optical modulator, a space filter, a middle-infrared laser power stabilization system, a photoelectric detector vacuum chamber, a low-temperature radiometer system and a vacuum set. After output laser of the middle-infrared tunable optical parametric oscillator passes through the acoustic optical modulator, the output laser enters the space filter to optimize beam quality of the laser and is divided into two beams after passing through a beam splitting piece, one laser beam enters the laser power stabilization system and is used for outputting a voltage signal to control a drive signal on the acoustic optical modulator, and the other laser beam enters the photoelectric detector vacuum chamber and the low-temperature radiometer system and is used for calibrating absolute spectral responsivity of a photoelectric detector. According to the technical scheme, output wavelengths of a laser device can be continuously regulated within the range of 1.3 micrometers-2 micrometers and 2.2 micrometers-4.7 micrometers, a calibrated wavelength point of the absolute spectral responsivity can be increased at will, and measurement accuracy is improved.
Owner:THE 41ST INST OF CHINA ELECTRONICS TECH GRP
Absolute distance measurement method and system using optical frequency generator
ActiveUS7898669B2Improve measurement uncertaintyOptical rangefindersInterferometersLength waveAtomic physics
Owner:KOREA ADVANCED INST OF SCI & TECH
Self intermodulation inhibition method for transmission passive intermodulation (PIM) test
ActiveCN104101807AAvoid transmissionImprove measurement uncertaintyElectrical testingDynamic rangeMeasurement uncertainty
The invention provides a self intermodulation inhibition method for a transmission passive intermodulation (PIM) test. A phase position of a PIM product is measured through a PIM reference channel, and in allusion to the transmission PIM test of appliance parts such as antennae, a method for inhibiting transmission self PIM of a test system is provided and a novel method for inhibiting reflection self PIM can be provided. By means of the scheme, reflection self intermodulation and system transmission self intermodulation can be inhibited, thereby, excessive demands for intermodulation features of loads are not required, meanwhile, interference of transmission PIM and reflection PIM can be measured, and the dynamic range and the measurement uncertainty of the transmission PIM test of the system can be improved.
Owner:CHINA ELECTRONIS TECH INSTR CO LTD
Rotary absorber-based high-energy laser energy measuring device
InactiveCN103398785AIncreased resistance to laser damage thresholdReduce the average laser power densityRadiation pyrometryElectricityLight beam
The invention discloses a rotary absorber-based high-energy laser energy measuring device. The rotary absorber-based high-energy laser energy measuring device comprises a heat absorber, a temperature sensor and a temperature acquisition and processing unit, wherein the temperature sensor is embedded in the heat absorber and is electrically connected with the temperature acquisition and processing unit; a rotating shaft is arranged in the center of the heat absorber, so that the heat absorber and the temperature acquisition and processing unit can rotate around the rotating shaft; an incident surface of the heat absorber is provided with an annular V-shaped groove; the inner surface of the annular V-shaped groove is a diffuse reflection surface; the annular V-shaped groove has a sectional shape of two V-shaped groove structures along the rotating shaft; openings of the V-shaped groove structures face the high-energy laser incidence direction; and the aperture of the high-energy laser beam is less than the size of the openings of the V-shaped groove structures. According to the rotary absorber-based high-energy laser energy measuring device, a partial surface of the absorber is prevented from being irradiated by strong laser continuously by a mode of cyclic scanning of the laser beam to the surface of the heat absorber, the average laser power density irradiated to the surface of the heat absorber is reduced, and the anti-laser-damage threshold value of the measuring system is improved.
Owner:NORTHWEST INST OF NUCLEAR TECH
Confocal axial response curve peak position extracting algorithm
InactiveCN104361226AIncrease profitImprove measurement uncertaintySpecial data processing applicationsLevenberg–Marquardt algorithmPeak value
The invention discloses a confocal axial response curve peak position extracting algorithm and belongs to the technical field of confocal scanning optical measurement. The method comprises the following steps of at first, normalizing data, and selecting effective data from measured data; taking a sinc4(a(x-b)) function as an objective function, and calculating the initial value of target parameter according to measured parameters; taking the sinc4(a(x-b)) function as the objective function, and using Levenberg-Marquardt algorithm to perform fitting to obtain the target parameter; according to the target parameter, calculating peak position. According to the confocal axial response curve peak position extracting algorithm, a confocal axial response curve peak position is obtained by taking sinc4 as the fitting objective function, so that data utilization rate and measurement uncertainty can be improved, meanwhile, iteration times is reduced, and the operation time of the extracting algorithm is reduced.
Owner:HARBIN INST OF TECH
Method and device for distance measurement
InactiveUS7324218B2Measurement is impossibleOptimizationOptical rangefindersActive open surveying meansDistance measurementPhysics
The present invention relates to a device (10) for distance measurement, with at least one transmitting branch (14) with a transmission source (22, 24) for a measurement signal for emitting a modulated measuring beam (16, 26, 36) in the direction of a target object (20), and with a receive branch (18) for the measurement radiation (17, 44) returning from the target object (30), and with a control and evaluation unit (28, 58) for determining the distance of the device (10) to the target object (20) from the measurement radiation returning from the target object (20).It is proposed according to the invention that the device (10) include means that enable measurement of distances with predetermined measurement uncertainties.The present invention further relates to a method for distance measurement, with which a measurement of distances with predetermined measurement uncertainties is possible. To ensure a distance measurement in a certain, predetermined measurement time, the value on which a distance measurement is based can be adjusted to the measurement uncertainty, and can be increased incrementally in particular.
Owner:ROBERT BOSCH GMBH
Device for measuring air refractivity based on dispersion interference method, and measuring method of device
InactiveCN104807781AGet the dispersion propertiesAchieving Relative MeasurementsPhase-affecting property measurementsBeam splitterSpectrum analyzer
The invention provides a device for measuring the air refractivity based on a dispersion interference method and a measuring method of the device. The device comprises an optical frequency comb with locked repetition frequency, a slab beam splitter with a splitting ratio of 50:50, a vacuum tube with a certain length, a hollow pyramid subjected to surface gold plating, and a spectrum analyzer used for recording an interference spectrum, wherein the optical frequency comb with locked repetition frequency has multiple stable-frequency longitudinal molds and is capable of acquiring the dispersion characteristics of the air refractivity; the vacuum tube is internally vacuumized and is externally communicated with air, so that relative measurement for the air refractivity can be realized under a condition of avoiding air extraction and air inflation, and relatively high measurement uncertainty can be obtained. The invention further discloses the measuring method of the device. The measuring device has the advantages of simple device, short measurement period, good stability and the like, and can be used for correcting the air refractivity in real time during precise length measurement.
Owner:TSINGHUA UNIV
Calibration of Step Attenuator
ActiveUS20150381139A1Computationally efficientReduce impactMultiple-port networksTransmission control/equlisationUltrasound attenuationEngineering
System and method for calibrating a step attenuator. N attenuation measurements of a step attenuator may be received, where the step attenuator includes M series-connected attenuation sections. Each attenuation section may be configured to switchably provide a respective level of attenuation, where N is greater than M, and where the step attenuator may be modeled via M+1 coefficients, including a coefficient for a no-attenuation state and respective coefficients for the attenuation sections. Values of the coefficients may be determined via least squares estimation using the N attenuation measurements, thereby calibrating the step attenuator.
Owner:NATIONAL INSTRUMENTS
Self-calibration device and method for emission rate coefficient of multi-spectrum radiation temperature measuring system
ActiveCN103630249AOvercoming Model ErrorsImprove measurement uncertaintyRadiation pyrometryColor/spectral properties measurementsEmissivityRadiation temperature
The invention discloses a self-calibration device and method for an emission rate coefficient of a multi-spectrum radiation temperature measuring system. The device comprises a wide spectrum optical source as well as an incidence collimating lens group and an outgoing collimating lens group which are arranged at the outgoing optical path of the wide spectrum optical source in sequence; a flame to be measured is arranged between the incidence collimating lens group and outgoing collimating lens group. The emission rate coefficient self-calibration system is arranged on the same path, penetrating through the measured flame, of the multi-spectrum radiation temperature measuring system, the emission rate coefficients of the flame under different wavelengths are obtained by recording the spectrum parameters of the wide spectrum optical source, the flame and the combination of the wind spectrum optical source and the flame, and the self-calibration device is used for the parameter calibrating of the multi-spectrum radiation temperature measuring system and overcomes the model error in the traditional theoretical calculation correction, so the measuring uncertainty is reduced.
Owner:NORTHWEST INST OF NUCLEAR TECH
Multi-spectral radiation temperature measuring system and multi-spectral radiation temperature measuring method
ActiveCN103644972AOvercoming Model ErrorsImprove measurement uncertaintyRadiation pyrometryRadiation temperatureMulti spectral
The invention discloses a multi-spectral radiation temperature measuring system and a multi-spectral radiation temperature measuring method. The multi-spectral radiation temperature measuring system comprises a wide-spectrum light source, and an incident collimating lens group, an emergent collimating lens group and a spectrograph which are sequentially arranged on an emergent light path of the wide-spectrum light source. A to-be-measured flame is arranged between the incident collimating lens group and the emergent collimating lens group. According to the multi-spectral radiation temperature measuring system, an emissivity coefficient self-calibration system is arranged on the same path as the measured flame. Flame emissivity coefficients under different wavelengths are obtained by recording spectral parameters of the wide-spectrum light source, the flame and the wide-spectrum light source plus the flame. The method is used for correcting parameters of the multi-spectral radiation temperature measuring system, overcomes model error in traditional theory calculation correction and improves the measurement uncertainty.
Owner:NORTHWEST INST OF NUCLEAR TECH
Spectral absorption rate measuring device and method of black body cavity
The invention discloses a spectral absorption rate measuring device and method of a black body cavity. The measuring device comprises a light source, a monochromator, a beam collimation system, a beamsplitter, a first trap detector, an integrating sphere, a second trap detector, a black body cavity, a standard whiteboard, an electrically controlled translation bench, a controller, and a signal amplifier, a six-and-a-half voltmeter and an industrial personal computer. According to the invention, an LDLS laser driving type light source and a monochromator are used for replacing the laser deviceto serve as a black body cavity spectral absorption rate measuring light source; and the absorption rate under the single wavelength point in the traditional measuring method can be extended to a special absorption rate under the broad band of 170nm to 2100nm. The Si / InGaAs trap detector is used for replacing the Si / InGaAs detector based on the traditional method, so that the influence on the measuring result by factors like an incident angle of incident light and a polarization degree is reduced and the measurement uncertainty is improved. The spectral absorption rate measuring mechanical device of a black body cavity is built by using the black body cavity clamp and the electrically controlled translation bench, so that the influence on the measuring result by the spatial position errorof the black body cavity during multiple times of measurement is reduced.
Owner:THE 41ST INST OF CHINA ELECTRONICS TECH GRP
Vacuum sealed valve leakage rate test system and method
InactiveCN109269742AImprove measurement uncertaintyRealize Quantitative TestingMeasurement of fluid loss/gain rateEngineeringVacuum pump
The invention provides a vacuum sealed valve leakage rate test system and method. The system consists of a first vacuum pump set and a second vacuum pump set, a leak detector, a vacuum chamber, a vacuum valve test cover, a pressure gauge, a standard leak hole, vacuum gauges, a gas source, and a first vacuum valve, a second vacuum valve, a third vacuum valve, a fourth vacuum valve, a fifth vacuum valve, a sixth vacuum valve, and a seventh vacuum valve, wherein the first vacuum pump set is connected to the vacuum chamber through the first vacuum valve, and the leak detector is connected to the vacuum chamber through the second vacuum valve. The vacuum chamber is connected to one ends of the vacuum gauges, the third vacuum valve and the fifth vacuum valve respectively. The other end of the fifth vacuum valve is connected to the standard leak hole. A tested vacuum valve is installed in the vacuum valve test cover, one end of the tested vacuum valve is connected to the other end of the third vacuum valve, and the other end is respectively connected to the fourth vacuum valve and the pressure gauge. The gas source is in connection with the vacuum valve test cover through the sixth vacuumvalve, and the second vacuum pump set is in connection with the vacuum valve test cover through the seventh vacuum valve respectively. The system and method provided by the invention realize quantitative test of the vacuum valve local leakage rate and total leakage rate, and greatly improves the measurement uncertainty of vacuum sealed valve leakage rate.
Owner:BEIJING DONGFANG MEASUREMENT & TEST INST
Measuring method of mid-infrared light signal intensity in wide temperature environment
InactiveCN103076088AMonitor operating temperatureImprove measurement uncertaintyPhotometry using electric radiation detectorsInstrumentation amplifierMeasurement device
The invention relates to a measuring method of the mid-infrared light signal intensity in wide temperature environment. According to the method, firstly, a measuring device is built, the measuring device comprises a mid-infrared light guide detector, a driving circuit and a signal collection recording instrument, wherein the driving circuit comprises an instrument amplifier unit and a constant flow source unit; secondly, the dark resistance value and the response rate value of the mid-infrared light guide detector at application environment temperature are obtained through measurement, and in addition, the balancing resistance and the magnification time parameter in the driving circuit are determined; and finally, the mid-infrared light signal intensity is obtained through calculation through the voltage signal and the monitored work temperature. The measuring method has the advantages that the optimal solution of the balancing resistance and the circuit magnification times is obtained according to the parameters of the dark resistance valve, the work voltage and the like of each detector at the wide temperature range end point, the output signal amplitude and the measurement dynamic range of a constant flow source type mid-infrared detection circuit are improved, the characteristics of concise step and convenience in realization are realized, and the measuring method can be used for the batch design of the mid-infrared detection circuit.
Owner:NORTHWEST INST OF NUCLEAR TECH
Tritium gas adsorption performance experiment device and method
ActiveCN111879793ASimplify the experimental stepsReduce duplicationMaterial analysis using wave/particle radiationX/gamma/cosmic radiation measurmentCirculator pumpIonization chamber
The invention belongs to the technical field of tritium adsorption performance experiments, and particularly relates to a tritium gas adsorption performance experiment device and a tritium gas adsorption performance experiment method, which are used for measuring the tritium gas adsorption performance of a sample to be measured. The device comprise a test box (1), wherein the interior of the testbox (1) is provided with a closed space and the body of the test box (1) is provide with a plurality of interfaces; The device also comprises a dry air input device (2), a standard tritium gas input device (3), a vacuum pump (4), a circulating pump (5), an ionization chamber (6), a first ethylene glycol bubbler (7), a hygrothermograph (9) and a pressure gauge (10) which are detachably arranged onthe test box (1) through the interfaces. According to the invention, a sample tritium adsorption device and a measuring device are integrated into a whole, so adsorption of a to-be-measured sample totritium is balanced in the closed test box (1), balanced gas in the test box (1) is directly measured, experimental steps are simplified, manual repeated operation is reduced, adsorption and desorption are simultaneously carried out in a closed space in the test box (1), so the method is more scientific.
Owner:CHINA INSTITUTE OF ATOMIC ENERGY
Online dual-mode calibration detection method and equipment for motor vehicle exhaust remote sensing monitoring device
PendingCN113358588AImprove output data accuracyImprove dynamic calibration measurement uncertaintyColor/spectral properties measurementsIn vehicleField experiment
The invention relates to an online dual-mode calibration detection method and equipment for a motor vehicle exhaust remote sensing monitoring device, which breaks through the field dynamic calibration technology by establishing a dual-mode metering calibration device combining the dynamic state and the static state of a motor vehicle exhaust remote sensing monitoring system. An electrically-driven vehicle-mounted calibration device with controllable speed and acceleration is used for calibrating a motor vehicle exhaust telemetering system in real time, the change trend of a detection result is analyzed under the series of change conditions of parameters such as a temperature field, a turbulent flow field, an external light field and a signal extraction mode, the uncertainty of dynamic calibration measurement is improved, the method fills the blank of lack of direct measurement standards of domestic motor vehicle tail gas telemetry systems, the problem that the tail gas telemetry systems cannot be dynamically traced under the current working conditions is solved, the accuracy of output data of the motor vehicle tail gas telemetry systems is improved, and a scientific and reasonable magnitude transmission technology is formed through complex flow field experiment research. Requirements of metering traceability and data quality evaluation of a motor vehicle exhaust telemetering system can be fully satisfied.
Owner:HENAN PROVINCE INST OF METROLOGY
Standard substance for calibrating magnification of industrial computed tomography (CT) system
InactiveCN102207470AAddressing Lack of Metrological CalibrationImprove conductivityMaterial analysis by transmitting radiationPlatinumPilot hole
The invention relates to the technical field of the transmission of metering and testing standard quantity values, and particularly relates to a standard substance for calibrating magnification of an industrial CT system. The standard substance for calibrating magnification of an industrial CT system is characterized in that: a substrate of the standard substance is provided with a counter bore and a pilot hole; inside the counter bore is provided a sheet with a through hole, wherein the thickness of the sheet is 0.1 to 0.3 mm, the sheet is made of metal platinum alloy, and the aperture of the through hole is 0.2 to 0.5 mm. According to the invention, a scanning electron microscope with a certified standard substance is employed for measuring, so a certified standard substance for calibrating magnification of an industrial CT system is obtained, thereby solving the problem of lack of calibration in metering and testing magnification of the industrial CT system, providing a trace valueto the source for an image length value of the calibrated industrial CT system with uncertainty of a given confidence interval attached; therefore, a three-dimensional image of the calibrated industrial CT system has traceable length values.
Owner:SHANGHAI INST OF MEASUREMENT & TESTING TECH
Natural gas high-flow real flow verification system
PendingCN108007534AVerification process is flexible and diversePerfect verification functionTesting/calibration apparatusInternal combustion piston enginesEngineeringControl valves
The invention discloses a natural gas high-flow real flow verification system. The system comprises a gas inlet, a filtering separation device, a pressure stabilizing control valve group, a bypass flow control valve group and an exhaust port. The bypass flow control valve group, an operating level standard device and a high-precision verification station are connected to the lower end of the pressure stabilizing control valve group. The operating level standard device comprises four turbines and a roots flowmeter, manifolds are arranged at upper and lower ends of the four turbines, the roots flowmeter is independently arranged outside the manifolds, and the operating level standard device can be connected with either the verification station or a secondary standard device with three inlets. A first inlet of the secondary standard device is connected with the operating level standard device and the high-precision verification station, a second inlet and a third inlet of the secondary standard device are connected with the verification station, and lower ends of the verification state and the secondary standard device can be both connected with a main flow control valve group. By adoption of the optimized verification system, a verification process is flexible and diversified, and verification functions are perfected.
Owner:XIAN CHANGQING TECH ENG
Three-dimensional configuration splicing method for large component based on laser vision sensing
ActiveCN110966937AImprove accessibilityImprove anti-interference abilityUsing optical meansEngineeringDimensional modeling
The invention discloses a three-dimensional configuration splicing method for a large component based on laser vision sensing, relates to the field of image measurement and data processing, and aims to solve the problems of large workload, low efficiency, poor anti-interference capability and difficulty in realizing on-line measurement of large complex profile straightness measurement. The three-dimensional configuration splicing method adopts an autonomously designed straightness splicing algorithm, breaks through the length limitation of single measurement, and is used for subsequent three-dimensional modeling and the like. The laser vision measurement method is derived from the idea of a pitch method, and the straightness of a large complex molded surface is measured by utilizing the advantages of accuracy, stability, real-time performance and the like of short-distance measurement of a laser vision sensor. The size of the molded surface of the large complex molded surface is large,so that the molded surface can be divided into a plurality of partially-overlapped sections with the length equal to that of laser stripes, segmented measurement is carried out in each segmented section, then data processing is carried out to carry out splicing reconstruction on a straightness curve, and the straightness of the large complex molded surface is calculated through the straightness curve obtained after splicing reconstruction. The method is applied to the field of image measurement.
Owner:HARBIN INST OF TECH
Displacement sensor structure and testing method
ActiveCN109099811ASolving Measurement ErrorsEliminate installation errorsMechanical measuring arrangementsInstallation ErrorMoving parts
The invention provides a displacement sensor structure and a testing method, and the head shape of the displacement sensor is a step, or a rack, or an array object with equally arranged height. In a measuring process, only the step or the rack with too high head will be broken down, a gap indicated value is equal to a known height of the broken step or rack, and the indicated value has no connection with which position of the step or the rack is broken. According to the displacement sensor structure and the testing method, a measurement error caused by the fact that a cutting position and a broken position are different in existing displacement measurements is solved, and it is needless to install repeatedly so that a part of installation errors is eliminated and installation and usage areconvenient. The structure is convenient to be installed and debugged through a structural design, and the sensor structure is flexible and stretchable when debugging. The sensor structure is locked to ensure sealing, which ensures that a gap value d between high-speed relative shear moving parts is measured in severe environments such as high temperature, high speed, radiation and dust and the like, so as to improve uncertainty of a measurement and contributions are made for calibration of engine apex moving gap and high speed railway moving gap.
Owner:BEIJING ZHENXING METROLOGY & TEST INST
Petroleum hydrometer calibration device and method
ActiveCN102023121BStable temperatureAchieve calibrationSpecific gravity measurementHydrometerGraduated cylinder
The invention relates to the technical field of the detection and the calibration of a hydrometer, in particular to a calibration device and method for calibrating a petroleum hydrometer. The calibration device comprises a fixed mount, a thermostatic bath and a scale, wherein the thermostatic bath is arranged in the fixed mount, the scale is arranged on the top surface of the fixed mount, a lifting rope is arranged below the scale, a glass measuring cylinder is arranged in the thermostatic bath, the glass measuring cylinder comprises a main measuring cylinder and an auxiliary measuring cylinder, the main measuring cylinder is communicated with the auxiliary measuring cylinder by a liquid level regulating device, and a thermometer is arranged in the main measuring cylinder. The invention realizes the switching among different calibration marking points of the hydrometer based on the vertical movement of the liquid level of the reference liquid, so that the liquid level of the referenceliquid can be tangential to the required calibration marking point, thereby meeting the calibration requirements of the hydrometer, filling in the gap that a low-range petroleum hydrometer can not becalibrated, expanding the calibration range of the petroleum hydrometer, improving the calibration automation degree, enhancing the calibration efficiency, reducing the measuring error and improving the calibration uncertainty level.
Owner:朱茜 +2
Apparatus for field calibration of large size liquid level sensors
ActiveCN104949739BLarge measuring rangeImprove measurement uncertaintyTesting/calibration apparatusLiquid storage tankLength measurement
The embodiment of the invention discloses a straight-line benchmark structure for field calibration of a large-size liquid level sensor and relates to the technical field of length measurement. The straight-line benchmark structure can be used for the length measurement of the field calibration of the large-size liquid level sensor. A plumb line fixing mechanism is fixed to a flange plate, a laser reflection buoyancy target is a flat cylinder with a through hole in the center, a plumb line penetrates through the center through hole of the laser reflection buoyancy target, one end of the plumb line is connected with the plumb line fixing mechanism, and the other end of the plumb line is connected with a plumb bob. The laser reflection buoyancy target is arranged between the plumb bob and the plumb line fixing mechanism, the plumb bob is vertically hung in a tank body of a liquid storage tank and extends below the liquid surface in the liquid storage tank, and the laser reflection buoyancy target floats on the liquid surface in the liquid storage tank. The straight line benchmark structure is mainly used for the field calibration of the large-size liquid level sensor.
Owner:BEIJING ZHENXING METROLOGY & TEST INST
Device and method for measuring lightning impact force and lightning fracture damage of carbon fiber laminates
ActiveCN111609958BImprove measurement uncertaintyTesting dielectric strengthInstrument screening arrangementsFiberLightning strike
The invention discloses a measurement device and method for lightning impact force and lightning fracture damage of a carbon fiber laminated plate with common-mode interference suppression performance. Through a certain length and a certain cross-section of the lightning impact force transmission insulating rod, it is transmitted to the piezoelectric sensing unit with a shielded shell, so that the measurement of the impact force of the tested carbon fiber composite laminate can be free from the influence of strong lightning current electromagnetic interference; through By adjusting the amplitude of the lightning current output by the controllable intensity lightning current generator, the mathematical analytical formula between the lightning impact force and the lightning current parameters of the tested carbon fiber composite laminate can be obtained; at the same time, by changing the tested carbon fiber The distance between the composite laminate and the piezoelectric sensor can obtain the response time characteristics of the lightning impact force, which provides theoretical support for the mechanism research of the lightning damage effect of the tested carbon fiber composite laminate.
Owner:XI AN JIAOTONG UNIV
A self-intermodulation suppression method for transmission passive intermodulation test
ActiveCN104101807BAvoid transmissionImprove measurement uncertaintyElectrical testingEngineeringDynamic range
Owner:CHINA ELECTRONIS TECH INSTR CO LTD
Standard substance for calibrating magnification of industrial computed tomography (CT) system
InactiveCN102207470BAddressing Lack of Metrological CalibrationImprove conductivityMaterial analysis by transmitting radiationPlatinumPilot hole
Owner:SHANGHAI INST OF MEASUREMENT & TESTING TECH
Emissivity coefficient self-calibration device and method for multi-spectral radiation temperature measurement system
ActiveCN103630249BOvercoming Model ErrorsImprove measurement uncertaintyRadiation pyrometryColor/spectral properties measurementsEmissivityWavelength
The invention discloses an emissivity coefficient self-calibration device and method for a multi-spectral radiation temperature measurement system, comprising a wide-spectrum light source and an incident collimating lens group and an outgoing collimating lens group sequentially arranged on the outgoing light path of the wide-spectrum light source. The measuring flame is arranged between the incident collimating lens group and the outgoing collimating lens group. The present invention sets an emissivity coefficient self-calibration system on the same path that the multi-spectral radiation temperature measurement system passes through to measure the flame. By recording the spectral parameters of the wide-spectrum light source, the flame, and the combined flame of the wide-spectrum light source, the parameters obtained at different wavelengths are obtained. The flame emissivity coefficient is used in the parameter correction of the multi-spectral radiation temperature measurement system, which overcomes the model error in the correction of traditional theoretical calculations and improves the measurement uncertainty.
Owner:NORTHWEST INST OF NUCLEAR TECH
A kind of air refractive index measurement device and measurement method based on dispersion interferometry
InactiveCN104807781BGet the dispersion propertiesAchieving Relative MeasurementsPhase-affecting property measurementsBeam splitterSpectrum analyzer
The invention provides a device for measuring the air refractivity based on a dispersion interference method and a measuring method of the device. The device comprises an optical frequency comb with locked repetition frequency, a slab beam splitter with a splitting ratio of 50:50, a vacuum tube with a certain length, a hollow pyramid subjected to surface gold plating, and a spectrum analyzer used for recording an interference spectrum, wherein the optical frequency comb with locked repetition frequency has multiple stable-frequency longitudinal molds and is capable of acquiring the dispersion characteristics of the air refractivity; the vacuum tube is internally vacuumized and is externally communicated with air, so that relative measurement for the air refractivity can be realized under a condition of avoiding air extraction and air inflation, and relatively high measurement uncertainty can be obtained. The invention further discloses the measuring method of the device. The measuring device has the advantages of simple device, short measurement period, good stability and the like, and can be used for correcting the air refractivity in real time during precise length measurement.
Owner:TSINGHUA UNIV
Measuring method of mid-infrared light signal intensity in wide temperature environment
InactiveCN103076088BMonitor operating temperatureImprove measurement uncertaintyPhotometry using electric radiation detectorsInstrumentation amplifierSource type
Owner:NORTHWEST INST OF NUCLEAR TECH
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