Product
Patsnap Eureka
For R&D, Patsnap Eureka makes reading and utilizing patents & technical documents easy.
Patsnap Eureka AIR
Designed for self-driven R&D workflows. Generate viable solutions, solve complex R&D challenges, empower your innovation with AI.
Patsnap Eureka Materials
Designed for material experts only. Revolutionize your material R&D, from search, analyze, to developing new materials.
Feature
TechResearch
Generate reliable direction feasibility study reports for your R&D in just a few steps.
TechSeek
Discover and master advanced knowledge NOW. Basics, ideas, possibilities, all at once.
TechMind
As an expert in R&D Theories, TechMind can generates customized viable solutions instantly.
TechRisk
Analyze your overall solution with one click, know your potential R&D risks in advance.
TechMonitor
Get weekly tech updates, stay abreast of the latest tech innovations and key insights.
Patents
Literature
Hiro is an intelligent assistant for R&D personnel, combined with Patent DNA, to facilitate innovative research.
318results about How to "Reduce measurement impact" patented technology
Efficacy Topic
Property
Owner
Technical Advancement
Application Domain
Technology Topic
Technology Field Word
Patent Country/Region
Patent Type
Patent Status
Application Year
Inventor
Mechanical seal performance testing device
ActiveCN103267613AAvoid axial forceRealize automatic adjustmentMeasurement of fluid loss/gain rateWork measurementFriction torqueAxial force
Provided is a mechanical seal performance testing device. The mechanical seal performance testing device comprises a main shaft, a working cavity with end caps at two ends, and two sets of mechanical seals to be tested. A shaft sleeve and the main shaft are in clearance fit and penetrate through the end caps at the two ends of the working cavity together. U-shaped openings on the same generatrix are arranged in two ends, extending out of the end caps, of the shaft sleeve, and a transmission pin is arranged on a portion, corresponding to the U-shaped openings, of the main shaft; two sections of threads which are equal in thread pitch and opposite in screwing direction are arranged in the middle of the shaft sleeve, and movable ring bases in the two mechanical seals to be tested are arranged on the back sides of two nuts screwed on the threads respectively; the movable ring bases and the shaft sleeve slide in the axial direction and are located and connected in the circumferential direction; a radial force sensor used for measuring end face friction torque indirectly is arranged on the transmission pin, and an axial force sensor used for measuring end face specific pressure is arranged between the back side of a static ring and the end cap of the working cavity; the end cap is provided with an annular ring which is concentric with a center hole, and therefore a leakage cavity used for collecting leakage amount is formed. The mechanical seal performance testing device is suitable for mechanical seal performance tests of various pressure working conditions and various size series, including performance tests of high-pressure and large-diameter mechanical sealing.
Owner:NANJING FORESTRY UNIV
Channel quality reporting method and corresponding device
InactiveCN101827387AReduce measurement impactGuaranteed accuracyError preventionWireless communicationCommunications systemEngineering
The invention relates to a channel quality reporting method and a corresponding device, and is suitable for a wireless communication system adopting multi-point cooperative transmission. The method comprises the following steps that: when receiving a multi-cell cooperative channel quality indicator CQI measurement pilot frequency emitted in cooperative resources and a public pilot frequency of a service cell emitted in bandwidth resources of a whole system by a service cell base station, a terminal in multi-cell cooperation feeds back to the service cell base station the multi-cell comprehensive channel information in the cooperative resources measured according to the CQI measurement pilot frequency and the CQI information of the service cell in non-cooperative resources measured according to the public pilot frequency so as to be used for the service cell base station to allocate cooperative resources and non-cooperative resources in the cooperative transmission for the terminal. The invention can reduce the impact on the terminal channel measurement of the service cell and the cooperative cell, and ensures the accuracy of multi-cell channel quality measurement in the cooperative transmission.
Owner:ZTE CORP
Structure light 3D measuring technology based on edge gray code and line movement
InactiveCN101303229AEliminate one-bit decoding errorsAdaptablePhotogrammetry/videogrammetryUsing optical meansThree dimensional measurementEdge based
The invention relates to a 3D measurement technique of structured light based on edge Gray code and line shift. The technique of optical 3D measurement belonging to noncontact measurement is one of the most effective means for acquiring 3D information of objects, and is mainly advantaged by noncontactness with surfaces of target objects and high sampling density. Among optical 3D measurement techniques, the structured light coding method is most widely applicable to the fields of 3D reconstruction and industrial measurement. The 3D measurement method of structured light based on edge Gray code and line shift of the invention comprises extracting edges and centers of strips of each frame of image prior to intensity binarization using the sub-pixel positioning technique, using the points on the edges and the centers as the sampling points, then solving the Gray code according to the gray-scale value 0 or 1 in the image after intensity binarization, and finding a correspondence relationship between the edges of the intensity image and the coded pattern. The invention is applicable to 3D measurement techniques.
Owner:HARBIN UNIV OF SCI & TECH
Human glucose concentration continuous monitoring device based on optical fiber surface plasmon resonance
InactiveCN101819136ASimple structureReduce volumePhase-affecting property measurementsHuman bodyConcentrations glucose
The invention discloses a human glucose concentration continuous monitoring device based on optical fiber surface plasmon resonance. An optical fiber SPR (Surface Plasmon Resonance) probe is implanted in a human body; light emitted by a light source reaches the optical fiber SPR probe via an optical fiber coupler; after SPR attenuation, reflected light reaches a spectrograph through the optical fiber coupler; and a computer analyzes and processes data output by the spectrograph and displays monitoring results. A micro-cavity is fixed outside the optical fiber SPR probe, one side of the micro-cavity is a semitransparent film, and only glucose and other micromolecules can enter the micro-cavity. GGBP proteins or borate polymers are fixed on the goldfilm surface of the optical fiber SPR probe and can carry out specificity absorption to the glucose molecules, thereby improving the measurement sensitivity. The invention can realize human glucose concentration continuous monitoring by measuring the glucose concentration of human body tissue fluid, has high measurement precision and good stability and can realize 24-hour human glucose concentration continuous monitoring and provide comprehensive glucose concentration change data for better guiding the diabetes treatment.
Owner:TIANJIN UNIV
Integrated correcting system and correcting method applied to different active array antennas
ActiveCN106443211AImprove calibration accuracyShort correction timeAntenna radiation diagramsPersonal computerCorrection method
The invention relates to an integrated correcting system and correcting method applied to different active array antennas. The integrated correcting system includes an active array antenna, a high-precision measurement real-time compensation unit, a testing probe, an industrial personal computer, a vector network analysis meter, a RF cable, and a low frequency cable. According to the invention, the integrated correcting system is advantaged by high correcting precision, short correcting time, simplicity and easiness of implementation, strong universality and excellent industrial reliability.
Owner:XIAN INSTITUE OF SPACE RADIO TECH
Optical fiber grating multi-parameter comprehensive sensing experimental apparatus
InactiveCN1605835ASimple structureNovel structureConverting sensor output opticallyCantilevered beamGrating
The present invention is multi-parameter comprehensive fiber grating sensing experiment instrument as one kind of physical and detection technology teaching instrument. The instrument includes measuring unit, sensing unit and fiber coupling link. The sensing unit includes frame, equal-thickness isosceles triangle cantilever beam fixed inside the frame, gravitational pendulum fixed to the bottom of the cantilever beam, two fiber gratings with the same parameters adhered symmetrically on two sides of the cantilever beam, micro displacement meter fixed horizontally to one side of the frame, micro obliquity meter fixed vertically on the other side of the frame and electromagnetic coil fixed inside the bottom of the frame. The instrument may be used in detecting current, obliquity, vibration and displacement, performing various fiber experiment, etc. and is suitable for use in relevant teaching experiments.
Owner:TSINGHUA UNIV
Interferometric optical fiber sensor based on pohotonic crystal optical fiber
InactiveCN104297208ASimple structureEasy to manufacturePhase-affecting property measurementsRefractive indexPhotonic-crystal fiber
The invention discloses an interferometric optical fiber sensor based on a pohotonic crystal optical fiber. The pohotonic crystal optical fiber at the middle section is connected with monomode optical fibers at two ends via core shift connecting structures, wherein the diameters of claddings of the monomode optical fibers at two ends are 125 microns, and the diameters of fiber cores are 8.3 microns; the pohotonic crystal optical fiber at the middle section is a PM-125 type pohotonic crystal optical fiber manufactured by the fiberhome telecommunication, the cladding diameter is 125 microns, the diameter of the fiber core is 7 microns, and the length is 5cm, and the section acts as a sensing region. The interferometric optical fiber sensor is not sensitive to temperature, and is relatively high in refractive index, and can act as a refractive index sensor, and meanwhile, influences on refractive index measurement precision caused by the change of temperature can be alleviated. The interferometric optical fiber sensor based on the pohotonic crystal optical fiber is simple in structure, is easy to manufacture, meanwhile can alleviate influences on the single-parameter measurement precision by temperature, is relatively high in practical value, and is suitable for the fields of industrial production, defense-related science and technology, medical treatment, people's livehood and the like.
Owner:TIANJIN UNIVERSITY OF TECHNOLOGY
Method for improving measurement precision of beam polarization degree
ActiveCN101949734AReduce measurement impactPhotomechanical exposure apparatusMicrolithography exposure apparatusBeam polarizationData treatment
The invention relates to a method for improving measurement precision of a beam polarization degree. A utilized polarization detection device comprises a phase delay device, an analyzer and a photo detector which are sequentially arranged along an optical axis of a system of the device, wherein the output of the photo detector is connected with a signal processing system, a beam to be measured which is parallel to the optical axis of the system is emitted to the phase delay device and the analyzer and detected by the photo detector, and the electric signal output by the photo detector is sent to the signal processing system for data processing. The method is characterized in that the transmission axis direction of the analyzer and the polarization direction of the beam to be measured are adjusted to be parallel or vertical according to the polarization direction of the beam to be measured, and then the measurement of the polarization degree of the beam to be measured is carried out. A stokes parameter and the polarization degree of the beam to be measured are obtained according to the light intensity detected by the photo detector. The invention can improve the measurement precision of the polarization degree.
Owner:BEIJING GUOWANG OPTICAL TECH CO LTD
Position measuring device and position measuring method
InactiveCN101634545AReduced installation and commissioning requirementsHigh sensitivityUsing optical meansProjection imagePhysics
The invention provides a position measuring device and a position measuring method. The position measuring device comprises a light source module, an illumination module, a projection aperture, a projection raster, a projection imaging module, a detection imaging module, a detection raster and a detection module, wherein after light emitted by the light source module passes through the illumination module, the projection aperture and the projection raster, the projection raster is imaged on an object to be measured by the projection imaging module so as to form a raster image; and the raster image is imaged to the detection raster so as to form a detection image by the detection imaging module; the detection image and the detection raster are overlaid to form a Moire fringe; the Moire fringe is detected by the detection module; and the projection raster is a rough raster. The invention has simple structure and higher sensitivity and measures in a direct way.
Owner:SHANGHAI MICRO ELECTRONICS EQUIP (GRP) CO LTD
In-situ calibration device for steady state flow rate of high-temperature propellant of attitude control engine and calibration method
ActiveCN107131931AReduce the influence of flow measurementHigh measurement accuracyTesting/calibration apparatusAttitude controlControl system
The invention discloses an in-situ calibration device for the steady state flow rate of a high-temperature propellant of an attitude control engine and a calibration method. The calibration device comprises a propellant supplying device, a high-low temperature box, a weighing and recycling device, a control system and a measuring system; the propellant supplying device is used for supplying flow rate, pressure and propellant at stable temperature for a calibration system according to the flow rate requirement on a mass flow meter to be calibrated; the high-low temperature box is used for heating the propellant supplying device according to the calibration requirement of the mass flow meter to be calibrated; the weighing and recycling device is used for weighing and recycling the propellant which flows through the mass flow meter within the calibration setting time; the control system is used for controlling and regulating the propellant supplying device, the high-low temperature box and the weighing and recycling device; and the measuring system is used for collecting and treating data. By adopting the device, the influence of medium temperature, density and the like on the measuring result of the mass flow meter can be effectively reduced, and the flow rate measuring accuracy is improved.
Owner:XIAN AEROSPACE PROPULSION TESTING TECHN INST
Wireless sensor network system based on quantum encryption
ActiveCN107135072ASecure EncryptionImprove securityKey distribution for secure communicationSecurity arrangementCiphertextQuantum channel
The invention discloses a wireless sensor network system based on quantum encryption. The wireless sensor network system comprises a plurality of sensor nodes and a plurality of network relay nodes; each of the sensor nodes includes a first quantum communication system, a first encryption and decryption system, a first wireless communication system, and a first data collection and processing system; each of the network relay nodes includes a second quantum communication system, a second wireless communication system, a second encryption and decryption system, a second data storage and forwarding system, and a key management system. The sensor nodes apply for keys from the network relay nodes in a neighboring area, and quantum communication channels can be established therebetween; for the network relay nodes that are not within the neighboring area, the quantum communication channels cannot be established between the sensor nodes and the network relay nodes; the sensor nodes forward a ciphertext to a target node via the network relay nodes; and the whole sensor network negotiates the keys via the quantum channels, and transmits a stream cipher via wireless communication channels. According to the system disclosed by the invention, the data transmission of the constructed wireless sensor network is secure and reliable.
Owner:东土科技(宜昌)有限公司
Convertor station direct current filter differential protection method and device
ActiveCN103346541AMitigate measurement effectsReduced risk of false and rejected operationsEmergency protective circuit arrangementsDistortionCurrent transformer saturation
The invention relates to a convertor station direct current filter differential protection method and device. The convertor station direct current filter differential protection device firstly acquires the current on the high voltage side of a direct current filter and the current on the low voltage side of the direct current filter, calculates the difference value of the currents, and then conducts logical judgment and processing according to protection logic. The convertor station direct current filter differential protection method can judge a failure quickly and accurately, and the risks of protection maloperations or protection failures due to the fact that a current transformer is saturated and measurement distortion occurs are avoided when a failure occurs.
Owner:STATE GRID CORP OF CHINA +2
Resource distribution and data processing method and device thereof
ActiveCN104955106AReduce measurement impactSynchronisation arrangementNetwork traffic/resource managementComputer scienceResource distribution
The embodiment of the invention discloses a resource distribution and data processing method and a device thereof. In a time period T, in N groups of time slots configured according to a preset rule, the time slot of sending specific data is determined, wherein the each one of the N groups of time slots comprises M time slots, the M*N time slots are in discrete distribution in the time period T, M and N are integers which are not smaller than 1, the time period T comprises T time slots, since the M*N time slots are in discrete distribution in the time period T, the time slot interval between the time slots in the M*N time slots is large enough, and thus when the specific data is sent in the determined time slot of sending the specific data, the measurement influence of UE and RRM of source cell and target cell service is reduced as much as possible.
Owner:HUAWEI TECH CO LTD
Method for measuring satellite magnetic torque in geomagnetic environmental magnetic field
InactiveCN104335716BSmall fluctuationHigh precisionMagnetic property measurementsMagnitude/direction of magnetic fieldsCalculation errorDigital converter
The invention discloses a satellite magnetic moment measurement method in the geomagnetic environment magnetic field, which uses the characteristic that the satellite magnetic moment is consistent with the direction of the earth's magnetic field, simplifies the satellite magnetic moment to measure the satellite residual magnetic moment and the satellite magnetic moment, and uses three orthogonal The remanent magnetic moment in the direction is decomposed into the magnetic moment of the equatorial plane and the horizontal plane where the satellite is transposed by 90°. During the measurement, the satellite should not be turned over, and the vertical component of the magnetic induction moment should be separated; the measurement method uses three-component and single-component magnetometers , the magnetic sensor is arranged near the satellite, connected to the magnetometer main box through a 20m signal line, and the analog / digital converter converts the analog quantity into a digital quantity. Through the test software compiled in BC++ language under the Windows interface, the microcomputer has storage measurement functions for data, calculation of magnetic moments, and documentation. The invention has strong versatility and is easy to operate. Due to the short test time, the fluctuation of the environment magnetic field is small, the calculation error of the magnetic moment is also small, and the measurement accuracy reaches 7.5%.
Owner:SHANGHAI INST OF SATELLITE EQUIP
Method for setting power bias and carrying out system dispatching
ActiveCN1866777AReduce uncertaintyReduce complexityTransmission control/equalisingAmplitude-modulated carrier systemsDistributed powerResource allocation
The invention discloses a installing power offset and scheduling system method, which comprises the following steps: according to the power of rapid descending sharing channel HS-DSCH and HS-PDSCH channel spread-spectrum code N distributed by system to make sure the sending power of every code; according to sending power of public pilot channel CPICH distributed by system and certained sending power of every code to install the corresponding CQI measuring power bias. The invention can make every code channel send data in the same power to reduce indeterminacy and complexity distributed by sending power and spread-spectrum code resource of HSDPA user; the sending power of HSDPA user is kept constant at certain time to reduce the effect of HSDPA sending power wave and CQI measuring; the system can distribute power and spread-spectrum code resource., which controls the resource between R99 and HSDPA user.
Owner:XFUSION DIGITAL TECH CO LTD
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
Plant transpiration measuring device
The invention discloses a plant transpiration measuring device. The device comprises an observation room, a condensation system, a water collection measuring component and an exhaust component, wherein the observation room is of a container structure that one end of the observation room is provided with an inlet, while the other end thereof is provided with an outlet; the outlet of the observation room is communicated with one end of a cooling tube of the condensation system; the other end of the cooling tube is communicated with the water collection measuring component; the cooling tube is communicated with the exhaust component; and the bottom of the water collection measuring component is provided with a gravity measuring component. The measuring device not only has the advantages of simple structure, easy manufacturing, convenient carrying, low price and convenient operation and use, but also has excellent measuring effect and can directly measure transpiration water consumption data of plant branches or plants.
Owner:BEIJING FORESTRY UNIVERSITY
In-situ comprehensive inquiry platform for beach shallow sea engineering geological properties
PendingCN109870722AReliable Engineering Geological EvaluationQuick surveyWaterborne vesselsFlow propertiesSoil mechanicsEngineering geology
The invention discloses an in-situ comprehensive inquiry platform for beach shallow sea engineering geological properties. The platform comprises a platform ship, a beach shallow sea sounding unit, anin-situ sediment sampling unit, a sea geophysical prospecting unit and a water power in-situ observation unit, wherein the beach shallow sea sounding unit comprises a beach shallow sea static sounding device and a beach shallow sea power sounding device; the platform ship adopts special structural design; on the basis of the platform ship which carries various ocean engineering geological testinginstruments, the quick measurement of the engineering geological properties of an appointed sea area is realized, i.e., the platform ship can stop on the water surface to serve as a fixed platform, and a running navigation test can be carried out to test flow parameters; and in short time, various engineering geology parameters can be measured in the same area in short time, the quick and comprehensive inquiry of engineering geology conditions in a shallow area of which the water depth range is 20m, wherein measurement parameters include water depth, topography and landforms, stratum structures, in-situ sediment soil mechanics parameters and the like. By use of the platform, a test area can be subjected to more reliable engineering geology evaluation, and testing efficiency in different sea areas can be greatly improved.
Owner:OCEAN UNIV OF CHINA +1
Fine particle matter measuring device and measuring method
The present invention discloses a fine particle matter measuring device for detecting the content of PM2.5 in the air, the fine particle matter measuring device includes a PM10 collector for collecting an air sample, a PM2.5 cutter for separating fine particulate matters in the air sample, a detecting device for detecting the content of the fine particulate matters in the air sample, and an air pump for stabilizing the air flow, the detecting device comprises a laser light scattering apparatus, a photoemission detector, and a signal processor, the fine particulate matter measuring device is simple, reliable, low in price , and apparatus-saving, and the present invention also discloses a measuring method using the fine particle matter measuring device.
Owner:YUANTAI AUTOMATION TECH SUZHOU
Chemical etching measurement method for optical element sub surface damages, auxiliary experiment device and test method
ActiveCN107907086AThe test result is simpleEasy to measurePreparing sample for investigationEtchingUltrasonic vibration
The invention relates to a chemical etching measurement method for optical element sub surface damages, an auxiliary experiment device and a test method. In the chemical etching measurement method, through measuring the roughness of a sample during the etching process, an evolutional relation curve for roughness outlines along with the etching time is drawn, and a sub surface damage depth value isthus obtained. The chemical etching auxiliary device is used to realize etching, cleaning and drying on the optical element, an ultrasonic vibration instrument is added during the cleaning process toassist cleaning, and a hair drier and a motor are added during the drying process to assist drying. The sub surface damage depth can be quickly and accurately measured; a set of etching auxiliary device is designed, the device is simple in operation, high in efficiency and low in danger, sediments generated during the etching process can be effectively reduced, and influences on etching and measurement are greatly reduced.
Owner:XI AN JIAOTONG UNIV
Synthesis measurement method and device for manufacturing engineering machinery hydraulic components
InactiveCN101398282AReduce development cost and cycleImprove development and production efficiencyAngles/taper measurementsMechanical diameter measurementsDevelopment periodHydraulic pressure
The invention discloses a method and a device for synthetically measuring the production of engineering machine hydraulic parts. The method constructs the synthesized measuring device and uses routine measuring tools to finish the measurement of various engineering machine hydraulic parts; the synthesized measuring device comprises a platform, an upright post is arranged on the platform, and a movement rest is arranged on the upright post; the upright post is divided into a fixed upright post and a movable upright post, and the movable upright post can move along a guide slot on the platform and is fixed with the platform through a compressing screw nut; and a measuring rod locating component, a vertical locating component and a horizontal locating component that are used for positioning the parts to be measured are further arranged on the synthesized measuring device. The invention can finish various accurate detection of products in all models with only one measuring tool set, can lower the research and development costs and the research and development period of the products, and improves research, development and production efficiency.
Owner:江苏力源金河铸造有限公司
Charged particle beam diagnosis device and diagnosis measurement method
ActiveCN107450094AEasy to count and measureDoes not affect electromagnetic propertiesX-ray spectral distribution measurementParticle physicsElectric field
The invention discloses a charged particle beam diagnosis device and a diagnosis measurement method. Through organic combination of a Faraday cylinder, a grid electrode and an MCP detection system, diagnosis of large-dynamic-range charged particle beam source parameters is realized, and simultaneous measurement of energy spectrum, absolute flow, collimation and uniformity of charged particles is also realized; through the design of three layers of parallel grids, energy of the charged particles can be selected by changing the voltage of the intermediate grid, the grids at the two ends are grounded to enable a uniform acceleration and deceleration electric field to be formed between the grids, and since the grids at the two ends can realize effective shielding for the changing electric field, magnetic characteristics of other devices are not influenced; and through design of small holes in the inner cylinder bottom portion of Faraday cylinder, measurement influence on absolute beam intensity is very small, beam intensity is greatly reduced, and counting measurement carried out by a follow-up MCP detection system for the charged particles can be realized conveniently.
Owner:SHANDONG INST OF AEROSPACE ELECTRONICS TECH
Gas production and water production section testing method of coal bed gas well and instrument
The invention discloses a gas production and water production section testing method of a coal bed gas well and an instrument. The testing instrument is placed in a casing of the coal bed gas well, a qualitative testing instrument qualitatively detects a gas production zone of a coal bed in the coal bed gas well, then a quantitative testing instrument quantitatively tests the gas production zone so as to measure a response value of the testing instrument, according to a quantitative plate of the testing instrument responding the same gas flow quantity via a simulated coal bed gas well in advance, gas flow quantity and water flow quantity which correspond to response of the quantitative testing instrument under the tested gas production zone are obtained, problems in terms of layered gas production and water production section testing corresponding to extraction conditions of the coal bed gas well are resolved, and the gas production and water production section testing method provides technical support for high-efficient development of coal bed gas.
Owner:PETROCHINA CO LTD +2
Ionization absorption spectrum detection device based on multi-channel electron multiplier
ActiveCN105092690AReduce air pressureReduce measurement impactMaterial analysis by electric/magnetic meansChannel electron multiplierElectron multiplier
The invention provides an ionization absorption spectrum detection device based on a multi-channel electron multiplier; the ionization absorption spectrum detection device includes an ionization chamber for ionizing gas, a golden net, the multi-channel electron multiplier, a voltage increasing and signal acquisition circuit, and a signal processing system; the golden net is arranged in the ionization chamber and arranged for collecting ions generated from ionization in the ionization chamber; the multi-channel electron multiplier is arranged in the ionization chamber, has the position opposite to the position of the golden net so as to form an electric field between the multi-channel electron multiplier and the golden net, receives the ions collected by the golden net through the action of the electric field and outputs a corresponding ion signal; the voltage increasing and signal acquisition circuit is connected to the multi-channel electron multiplier and arranged for providing voltage for the multi-channel electron multiplier and acquiring and outputting the ion signal; the signal processing system is arranged for receiving the ion signal and acquiring a corresponding ionization absorption spectrum according to the ion signal. The ionization absorption spectrum detection device can improve the accuracy degree of measurement beam line energy resolution ratio and reduce the influence of gas collision broadening on a final result.
Owner:SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
Method for measuring transmission of interference-insensitive terahertz wave
InactiveCN102213682AEliminate distractionsReduce measurement impactMaterial analysis by transmitting radiationPhysicsReference sample
The invention discloses a method for measuring transmission of an interference-insensitive terahertz wave, which is realized by adopting a terahertz wave beam splitter and two same detection systems. A terahertz wave beam is split into two beams by using the beam splitter, one beam of the terahertz wave beam is used for measuring a sample to be tested to obtain a sample signal, and the other beamof the terahertz wave beam is used for measuring a reference signal to obtain a reference signal, two sample transmissivities obtained through measurement are deducted to obtain a relative transmissivity of the sample to be tested. The selected reference sample and the sample to be tested have same interference characteristics, and floatation caused by an interference effect is effectively reduced. According to the method, the influence of the interference effect of parallel flat samples to the transmission measurement of terahertz waves can be effectively reduced, and measurement errors caused by the power fluctuation of a terahertz wave radiation source is eliminated. The invention has higher measurement sensitivity and stability and is suitable for fields such as micro and trace detection, and the like.
Owner:CHINA JILIANG UNIV
Method for testing interfacial fracture toughness of second-generation high-temperature superconducting strip
ActiveCN109738289AGuarantee the accuracy of the experimentEasy to measurePreparing sample for investigationMaterial strength using tensile/compressive forcesCcd cameraHigh-temperature superconductivity
The invention provides a method for testing the interfacial fracture toughness of a second-generation high-temperature superconducting strip. The method comprises the steps of: (1), solidifying an enhancement layer, the thickness of which is much greater than the superconducting strip, at two sides of the superconducting strip, so that a composite beam structure is formed and used as a sample to be tested; (2), coating speckles at the narrow side of the sample in the length direction; (3), cutting the initial crack at one end of the superconducting strip of the sample, then, loading the sampleon a stretcher, and aligning a CCD camera to one side of the sample, on which the speckles are coated; (4), respectively developing type I and II interlayer fracture experiments; and (5), obtaining type I and II interlayer fracture toughness of the sample by calculation by using a digital image correlation method, wherein the result is the type I and II interlayer fracture toughness of the superconducting strip. According to the method provided by the invention, the enhancement layer, the thickness of which is much greater than the superconducting strip, is increased at two sides of the superconducting strip; therefore, the fracture toughness of the superconducting strip can be measured by a conventional experimental method; and furthermore, the experimental method is simple and high in accuracy.
Owner:LANZHOU UNIVERSITY
Two-differential-pressure moisture flow on-line measuring device and method
InactiveCN105157766AReduce measurement impactGood streamlined structureVolume/mass flow by differential pressureMeasurement deviceEngineering
The invention discloses a two-differential-pressure moisture flow on-line measuring device and method. The device comprises a Venturi flowmeter on the upstream part, a spindle flowmeter on the downstream part and a processor. The opposite ends of the Venturi flowmeter and the spindle flowmeter are connected through a flange. The Venturi flowmeter and the spindle flowmeter are connected with the processor. The processor is provided with a moisture two-phase flow measuring module, and gas-liquid two-phase flow is output on line according to input parameters. The Venturi flowmeter is arranged in front of the spindle flowmeter, and influences caused by the flowermeter on the front portion on a flow field and the flowmeter on the rear portion are reduced to the greatest degree. The spindle flowmeter is of a good streamline structure, is small in flow resistance, has the good flow stabilizing and interference resisting ability and is arranged on the downstream part of the Venturi flowmeter, and therefore the measuring performance of the combined flowmeter can be improved to the greatest degree.
Owner:CHINA PETROLEUM & CHEM CORP +1
Measuring device of rigidity and damping of tangential contact
InactiveCN101666782AGuaranteed feasibilityGuaranteed reliabilityAnalysing solids using sonic/ultrasonic/infrasonic wavesUltrasonic/sonic/infrasonic wave generationDynamic methodMeasurement device
The invention relates to a measuring device of rigidity and damping of tangential contact, belonging to the technical field of dynamics measurement and comprising a testing frame, an excitation applying device, a measuring device and a loading device, wherein the measuring device and the loading device are respectively and fixedly arranged in the testing frame; the excitation applying device is fixedly arranged above the testing frame and corresponds to a sample to be measured; the measuring device and the loading device are connected; and the loading device is arranged at the bottom of the testing frame. The measuring device adopts a mode that the same tested samples are respectively arranged at the two ends to clamp another suspended testing sample, so as to lead a vibrational model to be simple, thus guaranteeing feasibility and reliability of dynamic method analysis, realizing reliable measurement of rigidity and damping of tangential contact, easily controlling the size of pretightening force and contact area, and furthest reducing the influence of vibration to measurement.
Owner:SHANGHAI JIAO TONG UNIV
Closed-type temperature control solid medium electrical resistivity measurement device
InactiveCN104635054ARealize measurementGuaranteed accuracyResistance/reactance/impedenceMeasurement deviceEngineering
The invention discloses a closed-type temperature control solid medium electrical resistivity measurement device, which belongs to the technical field of electrical measurement. The device is formed by that a test cavity is respectively connected with a direct-current power supply, a feedback-type temperature controller, a diaphragm vacuum pump, a magnetic drive pump and a Picoammeter, wherein the test cavity is formed into a coaxial hollow cylinder by an inner cavity and an outer cavity, and the upper end of the test cavity is sealed by a cover plate; the outer cavity is provided with a heat conduction oil circulation loop and is used for carrying out oil bath temperature control on the inner cavity by the heat conduction oil in a cycling way; an electrode and a test object are arranged in the inner cavity. According to the closed-type temperature control solid medium electrical resistivity measurement device, the inner cavity is subjected to even convection by a circulating oil bath so as to guarantee that temperatures of all positions in the inner cavity are consistent and are stable and constant within a range of 1DEG C. Since a form that a rubber gasket is externally pressed is adopted, a favorable vacuum degree in the inner cavity is guaranteed, an influence on an electrical resistivity measurement process by external environment humidity is minimized, and the closed-type temperature control solid medium electrical resistivity measurement device has the advantages of accurate measurement result, high reliability and easiness in operation.
Owner:NORTH CHINA ELECTRIC POWER UNIV (BAODING)
Who we serve
- R&D Engineer
- R&D Manager
- IP Professional
Why Patsnap Eureka
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com