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267 results about "Sensitivity testing" patented technology
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Radio interference detection and screening system for locomotive control unit radios
InactiveUS6782044B1Eliminate errorsThe result is accurateReceivers monitoringError detection/prevention using signal quality detectorTime segmentEngineering
A radio interference detection and screening system for performs on-locomotive testing of Locomotive Control Unit (LCU) radios. To eliminate bit errors during LCU sensitivity testing (also known as Bit Error Rate (BER) testing), the system detects interfering transmission signals which may cause bit errors in the transmission of test data, and suspends the LCU sensitivity performance testing during periods of detected external transmissions. Once the interfering transmissions are no longer detected by the system, the LCU then resumes the LCU sensitivity performance testing.
Owner:WABTEC HLDG CORP
Kits and devices for detecting analytes
ActiveUS20120045826A1Easy to operate manuallyLow costBioreactor/fermenter combinationsBiological substance pretreatmentsSpecific detectionAnalyte
The invention provides devices that improve tests for detecting specific cellular, viral, and molecular targets in clinical, industrial, or environmental samples. The invention permits efficient detection of individual microscopic targets at low magnification for highly sensitive testing. The invention does not require washing steps and thus allows sensitive and specific detection while simplifying manual operation and lowering costs and complexity in automated operation. In short, the invention provides devices that can deliver rapid, accurate, and quantitative, easy-to-use, and cost-effective tests.
Owner:FIRST LIGHT BIOSCI INC
Low-voltage powerline carrier communication experiment method and its experiment system
ActiveCN101404523AComparableRealize online sensitivity testPower distribution line transmissionLine-transmission monitoring/testingLow voltage circuitsPilot system
The invention relates to a low-voltage electric wire carrier communication test method and a testing system thereof. The testing method comprises the following testing methods: I, a carrier transmitting PWL online testing method; II, a carrier receiving sensitivity online testing method; III, a carrier communication anti-interference online testing method; IV, a low-voltage circuit impedance change online testing method. The testing system comprises a carrier transmitting device, a program control attenuating device, a tested carrier receiving device, a manual power network, a frequency spectrograph receiver, a computer, a frequency spectrograph, a noise simulator, an impedance simulator and a purifying power. The invention has the advantages of adopting a manual power network parameter model regulated in GB / T 6113 F2, thus having a high standardization degree and comparable testing data; avoiding the testing problems brought by adopting different carrier communication schemes; realizing the online sensitivity testing; carrying out the test at any time and being not affected by the external environment factors like the weather; besides, the invention can simulate the impedance change environment of a real circuit, thus leading the analyzing of the carrier communication on the impedance change of the circuit to be feasible.
Owner:NANJING XINLIAN ELECTRONICS
Apparatus and method for luminometric assay
InactiveUS7163822B2Low cost of reagentsLow costBioreactor/fermenter combinationsTelevision system detailsSensor arrayAssay
A small sized, cost-effective genetic testing apparatus that provides high sensitivity testing, for performing genetic testing simply and at low cost. An optical sensor array for the apparatus and method for luminometric assay comprises a means that simultaneously selects 2 pixels and detects minute amounts of chemiluminescence by obtaining the differential output of the respective signals.
Owner:HITACHI LTD
On-chip receiver sensitivity test mechanism
ActiveUS7254755B2Low costShorten test timeReceivers monitoringCorrect operation testingTransceiverLocal oscillator
An on-chip receiver sensitivity test mechanism for use in an integrated RF transmitter wherein the transmitter and the receiver share the same oscillator. The mechanism obviates the need to use expensive RF signal generator test equipment with built-in modulation capability and instead permits the use of very low cost external RF test equipment. The invention utilizes circuitry already existing in the transceiver, namely the modulation circuitry and local oscillator, to perform sensitivity testing. The on-chip LO is used to generate the modulated test signal that otherwise would need to be provided by expensive external RF test equipment with modulation capability. The modulated LO signal is mixed with an externally generated unmodulated CW RF signal to generate a modulated signal at IF which is subsequently processed by the remainder of the receiver chain. The recovered data bits are compared using an on-chip BER meter or counter and a BER reading is generated. The BER reading is used either externally or by an on-chip processor or controller to establish a pass / fail indication for the chip.
Owner:TEXAS INSTR INC
Electromagnetic radiation sensitivity testing method for increasing test precision
ActiveCN101520482AAccurate detectionMeet the test conditionsElectrical testingElectric field sensorCoupling
The invention discloses an electromagnetic radiation sensitivity testing method for increasing test precision, which comprises six steps: a single radiating antenna is used for radiating from a far field, and the radiating power of the antenna, the field intensity value of electric-field sensors and the distance between the antenna and the electric-field sensors are measured; a tested device is placed, and a plurality of electric-field sensors are arranged; the values of the electric-field sensors are recorded at the moment; the radiating antenna is approached to the tested device, the difference of the field intensity value at the moment and the field intensity measured in the last step is from 0dB to 6 dB, and the values of the electric-field sensors are recorded at the moment; the power of the radiating antenna is calculated in standard field intensity; and a sensitivity test is carried out. The invention gives out satisfying conditions between the radiation field intensity Elim prescribed by a testing standard and the radiation power P of the radiating antenna, utilizes an antenna theory to calculate the satisfying conditions between the power of the radiating antenna and the measuring field intensity value of a testing point when an internal coupling field of the tested device reaches the testing requirement and gives out a quantized calculating method, thereby increasing the precision of the electromagnetic radiation sensitivity test, and ensuring that a testing result is accurate and can repeatedly appear.
Owner:BEIHANG UNIV
Pulse oximetry testing
InactiveUSRE37970E1Precise positioningEliminate doubtsCalibration apparatusDiagnostic recording/measuringPulse oximetrySensitivity test
Owner:CLINICAL DYNAMICS CORP
Combined microwave sensor and dielectric constant measurement method for measured object
ActiveCN107490727AAccurate measurementAccurate and reliable measurement resultsResistance/reactance/impedenceSpurlineDielectric permittivity
A combined microwave sensor comprises metal ground at the bottom layer, dielectric at the middle layer, an input port, an output port I, a branched line coupler, a power divider, an open resonant ring, a microstrip line I and a microstrip line II, wherein the input port, the output port I, the branched line coupler, the power divider, the open resonant ring, the microstrip line I and the microstrip line II are arranged in the top layer. The input port and the output port I are connected with a vector network analyzer. The output side of the branched line coupler is provided with an isolated port and the output port I. The input end of the power divider is connected with the input port. The output port II and the output port III are connected with an annular directional coupler through a microstrip line. The open resonant ring is arranged between the power divider, the branched line coupler and the two microstrip lines. The combined microwave sensor has advantages of effectively eliminating background noise, realizing testing for weak background signals, and ensuring large offset of the sensor resonant frequency through small disturbance of the tested object. Therefore the combined microwave sensor provided by the invention has higher sensitivity and higher accuracy in dielectric constant measurement and can be used in high-sensitivity testing with small dielectric constant change.
Owner:HENAN NORMAL UNIV
Liquid insurance contracts
A liquid insurance contract (LIC) comprises a security which is traded or tradable and which has cash flows to the issuer based upon a liability whose exact value is unknown at the time of issuance. A method for creating and trading these LICs, as well as other financial products derived from LICs, may include any of the following steps: writing at least one LIC; preparing regulatory filings for at least two LICs; issuing the two LICs; preparing regulatory filings for a financial product which includes at least one detachable LIC provision; issuing the financial product; creating at least one underwriter as a closed end fund owned by a parent company; placing ownership of at least a portion of an issue of the financial product in an underwriter owned by a parent company; spinning off the underwriter from the parent company using at least one stock dividend; trading shares of the underwriter; reporting information on trades and positions of the underwriter; and valuing the underwriter using analytic modeling, sensitivity testing, portfolio analysis, and / or investment analysis.
Owner:EXTRAORDINARY RE HLDG INC
Core stress sensitivity measuring method
InactiveCN106153662ARealize online measurementReal-time observation distributionWater resource assessmentAnalysis using nuclear magnetic resonancePorosityNMR - Nuclear magnetic resonance
The invention discloses a core stress sensitivity measuring method based on nuclear magnetic resonance. Core stress sensitivity is measured on the basis of conventional displacement experiments and nuclear magnetic resonance testing methods. The method includes the steps that core pretreatment is conducted; a core is subjected to pressurized saturation to simulate formation water; the core is placed in a non-magnetic core clamp to be fixed to an NMR coil; confining pressure is set to test the nuclear magnetic resonance T2 relaxation spectrum of the core; stress values are set for repeated testing at intervals; the highest static stress values are sequentially reduced from 20 MPa to 2.5 MPa, each stress value is kept for a certain period of time to test the T2 spectrum, and the current conventional permeability and NMR permeability are obtained through computation; a core conventional stress sensitivity curve is drawn. By means of the method, people can understand the core stress sensitivity change rule from the micro perspective, characteristics such as pore size distribution, porosity changes and NMR permeability in the experiment process are provided, and change rules of microfracture compact matrix limestone pore size distribution, porosity and permeability in stress sensitivity testing can be effectively detected.
Owner:PEKING UNIV
System and method with improved automatic testing functions for defining capture thresholds
An implantable cardiac stimulation system capable of automatic capture verification is provided with an associated method for performing automatic testing functions using programmable, or automatically determined, AV delays. Automatic threshold testing and evoked response sensitivity testing performed at a user-specified AV delay setting, rather than a preset setting, allows assessment of automatic capture verification based on an AV delay relevant to daily system function. Further features of the present invention are an adjustable frequency with which automatic threshold tests are performed and an adjustable frequency with which threshold test results are stored in memory in a threshold record for better monitoring of lead stability or impending clinical problems. The frequency of performing threshold tests and the frequency of storing threshold test results may be varied according to the threshold stability. Stored threshold test results are advantageously displayed with respect to a fixed or variable time scale.
Owner:PACESETTER INC
Device for testing communication error rate and sensitivity of light module
ActiveCN103731206AAvoid the problem of multiple times of plugging and unplugging the optical fiber to test the optical powerImprove test efficiencyTransmission monitoring/testing/fault-measurement systemsTest efficiencyUltrasound attenuation
The invention discloses a device for testing the communication error rate and the sensitivity of a light module. The device is connected with a light receiving and emitting module to be tested and comprises an electric signal driving distribution and selection circuit, an error rate detection circuit, a light receiving and emitting module circuit, a light power detection and attenuation control circuit, a light signal driving distribution and selection circuit and a control circuit. The control circuit respectively controls a channel of electric signals output by the electric signal driving distribution and selection circuit, a channel of light signals output by the light signal driving distribution and selection circuit, the attenuation amount of light signals of the light power detection and attenuation control circuit and the detection error rate and the sensitivity of the error rate detection circuit. According to the device for testing the communication error rate and the sensitivity of the light module, signals transmitted simultaneously by different channels of the multi-channel light module can be tested, the problems that optical fibers need to be plugged and pulled multiple times in the error rate testing process, the sensitivity testing process and the light emitting power testing process of the light module so that the light power can be tested can be avoided, and the test efficiency and the reliability of test results are improved.
Owner:WUHAN TELECOMM DEVICES
Laboratory simulation detection device for low-voltage meter reading system
Owner:ZHUHAI KEHUI ELECTRICAL APPLIANCE CO LTD +1
Method and apparatus for performing receiver sensitivity testing and stressed receive sensitivity testing in a transceiver
InactiveUS20080226288A1Transmission monitoringTransmission monitoring/testing/fault-measurement systemsTransceiverEngineering
An apparatus and method are provided for use in a transceiver that enable the transceiver to test itself to determine whether the receiver portion of the transceiver meets receiver sensitivity requirements and stressed receive sensitivity requirements.
Owner:AVAGO TECH WIRELESS IP SINGAPORE PTE
Testing method and testing device of avalanche photodiode
ActiveCN103389451AReduce the impactHigh measurement accuracyIndividual semiconductor device testingCurrent voltageEngineering
The invention discloses a testing method of an avalanche photodiode, which is characterized by comprising the following steps that (1), a function control circuit and a testing circuit are arranged on a circuit mainboard, and the function control circuit tests the avalanche photodiode through controlling the testing circuit; (2), a sensitivity testing amplitude limiting amplification circuit, a reverse breakdown voltage testing circuit and a light current and dark current testing circuit are arranged in the testing circuit in Step (1); and (3), a Boost high voltage generation circuit, a linear voltage stabilization filter circuit, a constant current source generation circuit, a feedback type IV (current-voltage) conversion circuit, an isolated power supply circuit and an optocoupler transmission circuit which are connected sequentially are arranged in the testing circuits in Step (2). The invention further discloses a testing device of the avalanche photodiode, which implements the method.
Owner:GUANGDONG RUIGU OPTICAL NETWORK COMM CO LTD
System and method for testing acoustic emission sensor based on laser Doppler principle
InactiveCN102095805AMaterial analysis using sonic/ultrasonic/infrasonic wavesAcoustic emissionVelocity spectrum
The invention belongs to the field of test, measurement and calibration of sensors, and in particular relates to a system and a method for testing the sensitivity of an acoustic emission sensor. A system for testing the acoustic emission sensor based on a laser Doppler principle is used for testing the sensitivity of the acoustic emission sensor; and a sensitivity curve of the acoustic emission sensor is obtained according to a voltage spectrum and a velocity spectrum of the acoustic emission sensor which are measured by the system; and the displacement or displacement velocity of acoustic emission elastic waves is directly measured, accuracy of dozens of picometers can be achieved, the measured physical quantity can be traced to the source of time frequency, and a high-accuracy method is provided for testing the sensitivity of the acoustic emission sensor.
Owner:NAT INST OF METROLOGY CHINA
Systems and methods for testing sensitivity of wireless communication product in ISM frequency band
InactiveCN102324986AHigh sensitivityImprove accuracyReceivers monitoringUltrasound attenuationISM band
The invention discloses method for testing sensitivity of a wireless communication product in an ISM (Industrial, Scientific and Medical) frequency band, relating to methods for testing the sensitivity of the wireless communication products and solving the problem of low accuracy in a sensitivity test because the traditional method cannot simulate an actual condition. In a system I, signals emitted by an emitter are input into a receiver through an adjustable attenuator and a fixed attenuator. In a method I, the error rate from the adjustable attenuator to the receiver is adjusted to determine whether a preset error range is reached, and the sensitivity of the receiver is calculated. In a system II; the signals emitted by the emitter are input into the receiver after being processed by the adjustable attenuator I, a power distributor, a combiner and N adjustable attenuators II. In a method II, the reference attenuation values of the adjustable attenuators are respectively adjusted, the length of a transmission line is adjusted to make the receiver in a critical state, and a power meter is adopted to test the received signal power of the receiver and calculate the sensitivity of the receiver. The systems and methods disclosed by the invention are suitable for testing the sensitivity of the wireless communication products in the ISM frequency band.
Owner:HARBIN INST OF TECH
Explosive collision sensitivity instrument
InactiveCN102230877ASolving Consistency IssuesSolve the accuracy problemUsing mechanical meansMaterial analysisShock sensitivityEngineering
The invention relates to an explosive performance detection device, in particular to an explosive collision sensitivity instrument, which is mainly used for solving the problems of poor testing consistence, low testing accuracy and difficulty in ensuring the testing conditions existing in the conventional collision sensitivity testing device. The explosive collision sensitivity instrument comprises a drop hammer elevating and positioning mechanism, a drop hammer fixing and releasing mechanism, a collision device mechanism, an optically-controlled anti-secondary-collision mechanism and an integral control mechanism, wherein the drop hammer elevating and positioning mechanism comprises a base, an elevating guide rail which is vertically fixed on the upper surface of the base, an upper fixed plate which is horizontally fixed at the top end of the elevating guide rail and an elevating plate of which the end part is connected with the elevating guide rail in a sliding manner; and the drop hammer fixing and releasing mechanism comprises a drop hammer, a drop hammer sucking cover and a vacuum pump connecting pipe. The explosive collision sensitivity instrument has the characteristics of Custer and 12-type tool testing structures, can be used for detecting the sensitivity properties such as collision explosion probability, characteristic drop height and the like of an explosive, and can be used for detecting the safety performance of the explosive.
Owner:ZHONGBEI UNIV
Sensitivity testing apparatus for hydrophone
InactiveCN102661781AImprove accuracySmall margin of errorVibration measurement in fluidAccelerometerEngineering
The invention belongs to the underwater sensing field, and especially relates to a sensitivity testing apparatus for a hydrophone. The apparatus comprises a shake table, a rigid wall circular pipe containing a measure medium, an accelerometer, a support and a computer, wherein one end of the rigid wall circular pipe is open and the bottom of the rigid wall circular pipe is fixedly connected onto the shake table and is fixed with the accelerometer. The hydrophone which needs to be tested is hanged on the support and perpendicularly hanged on central axis of a liquid column of a container. The computer controls the shake table through a signal-generator and a power amplifier. An output signal of the accelerometer and an output signal of the hydrophone which needs to be tested are sent into the computer after conditioning respectively by two signal conditioning circuits. The computer computes the sensitivity of the hydrophone based on the value of the two input signals. The invention can reduce the error range and raise the accuracy of sensitivity testing.
Owner:天津市远海声学仪器有限公司
Automatic test system for high-altitude electric field radiation sensitiveness
InactiveCN106908673AMeet measurement needsEliminate reflections affecting test accuracyMeasuring interference from external sourcesRocketMicrowave signals
An automatic test system for high-altitude electric field radiation sensitiveness is disclosed and relates to the technical field of electromagnetic compatibility testing. The system comprises a large-sized detected member, an emission antenna system, a large power signal simulation system, a high-altitude upgrading platform, a field intensity monitor, an electric field probe and a control computer, wherein the control computer is used for sending control instructions to the large power signal simulation system via a signal interface board, the large power signal simulation system is used for generating small power microwave signals and amplifying the same, large power microwave signals are generated and transmitted to the emission antenna system, the emission antenna system is used for subjecting the coupled large power microwave signals to radiated emission into space, high field intensity electromagnetic wave signals are generated in space, the electric field probe is used for monitoring the high field intensity electromagnetic wave signals generated by the emission antenna system in space in real time, and monitoring results are sent to the control computer via the field intensity detector. The system disclosed in the invention can satisfy electric field sensitivity testing requirements for the large-sized measured member which is less than 18 m in height such as a carrier rocket and the like.
Owner:BEIJING INST OF ASTRONAUTICAL SYST ENG +1
WLAN RF index automatic test system
This invention relates to a system for auto-testing wireless LAN RF index, belonging to auto-controlling technology field, which adopts WLAN test equipment as flat form, comprising frequency spectrograph E4445A, signal source E4438C, danamometer E4416A, signalyzerE8408A and programmable fader 11713A and so on, using IEEE488 bus and its communication protocol via software programming to actualize auto-test of WLAN RF unit. The software is composed of a basic driving block, a bar-code scanning block, a power-testing block, a waveform testing and analyzing block, a minimum sensitivity testing block, a throughput testing block and a database-generating block. The invention use present testing equipment to actualize the auto-testing of wireless LAN RF unit function, and judges the test and improves service efficiency of the system and productivity in batch.
Owner:SHANGHAI CHONGZHENG ELECTRONICS TECH
Equipment and method for testing comprehensive vision functions
ActiveCN104382552AAvoid not being able to comprehensively assess visionRealize comprehensive visual function inspectionPhoroptersVisual functionDisplay device
The invention discloses equipment and a method for testing comprehensive vision functions. The equipment for testing the comprehensive vision functions comprises a first display and a vision function tester. The vision function tester is connected with the first display; the display can display video data under the control of the vision function tester, and the video data are used for testing at least one vision function by the aid of the vision function tester; the vision function tester is provided with a vision acuity testing module and a spatial contrast sensitivity testing module; the vision acuity testing module is used for testing the vision acuity; the spatial contrast sensitivity testing module is used for testing the spatial contrast sensitivity. According to the scheme, the equipment and the method have the advantages that the vision acuity and the spatial contrast sensitivity can be tested, accordingly, the comprehensive vision functions can be tested, the problem that only the vision acuity can be tested while the vision cannot be comprehensively assessed is solved, and the equipment and the method are favorable for finding defects of certain vision functions of tested objects and beneficial to follow-up treatment on the tested objects and have high practical value.
Owner:毕宏生
High-sensitivity testing method capable of simultaneously implementing measurement of multiple negative ions
InactiveCN102128890ARealization of high-sensitivity measurementWide range of measurement objectsComponent separationPhysicsSensitivity testing
The invention relates to a high-sensitivity testing method capable of simultaneously implementing measurement of multiple negative ions. The analysis objects not only comprise Cl<->, NO2<->, NO3<-> and SO4<2->, but also comprise easily polarized ions Br<->, I<-> and S2O3<2->. A negative ion analysis column AS9-HC and a protection column AG9-HC are adopted together, the washing solution comprises Na2CO3 and NaHCO3 in a concentration ratio of 9mm: 1mm, the flow rate of the washing solution is 0.9 to 1.1ml / min, the detector is an electrical conductivity detector, the current of a suppressor is 88mA, the temperature of the columns and the temperature of a detection cell are 28 to 32 DEG C, and the used quantitative ring is a polyether-ether-ketone (PEEK) tube with inside diameter of 0.030in, outside diameter of 1 / 16in and length of 7m. The lower detection limits of the ions are low and reach nano scale, namely the lower detection limit of Cl<-> is 0.61 nanometer, the lower detection limit of the NO2<-> is 0.94 nanometer, the lower detection limit of the NO3<-> is 0.93 nanometer, the lower detection limit of the SO4<2-> is 0.81 nanometer, the lower detection limit of the Br<-> is 0.90 nanometer, the lower detection limit of the I<-> is 2.48 nanometers and the lower detection limit of the S2O3<2-> is 1.84 nanometers. The method is simple and convenient for operation, and can be used for implementing high-sensitivity measurement of multiple negative ions indoors or outdoors.
Owner:TONGJI UNIV
Sensitivity testing method and system
The invention discloses a sensitivity testing method and system. The method comprises the following steps of: setting that a signal source and tested equipment belong to the same channel and are in a modulation mode; obtaining sensitivity standard values corresponding to the highest rate and the lowest rate in a standard template under the mode, and thereby setting a threshold value of the power level of the signal source; according to the threshold value, respectively testing to obtain sensitivity practical values under the highest rate and the lowest rate; according to the tested sensitivity practical values, linearly calculating to obtain sensitivity estimation values under all rates in the mode; then, comparing the sensitivity estimation values with the corresponding sensitivity standard values; if the difference value of the two is less than a pre-set value, setting sensitivity testing values according to the sensitivity standard values, and otherwise, setting the sensitivity testing values according to the sensitivity estimation values; and generating a testing template after being learned according to all the sensitivity testing values. The testing time is reduced; and the testing efficiency is increased.
Owner:湖州帷幄知识产权运营有限公司
Method for judging optimal working voltage of APD (Avalanche Photo Diode) of 10G EPON (Ethernet Passive Optical Network)
The invention discloses a method for judging the optimal working voltage of an APD (Avalanche Photo Diode) of a 10G EPON (Ethernet Passive Optical Network). The method comprises the following steps that: S1: according to the testing data of a BOSA or RSSI (Received Signal Strength Indicator) under a dark condition, obtaining the reverse breakdown voltage Vbr of the APD; S2: setting initial value working bias voltage, selecting fixed input light power, according to preset time of duration, testing a current error code rate or an error code number, then, carrying out stepping increasing on the working bias voltage by a set stepping value to repeatedly test at least three points until the error code rate or the error code number is increased; S3: taking the working bias voltage x and the error code rate y to solve a quadratic equation of one unknown y=ax2+bx+c to obtain three coefficients a, b and c; S4: according to the three obtained coefficients a, b and c, calculating an extreme valuex=-b / 2a, and obtaining a corresponding APD DAC (Digital to Analog Convertor); and S5: utilizing the APD DAC value to carry out sensitivity testing, if the sensitivity testing is qualified, carrying out subtraction and translation on the APD DAC of the current temperature and an APD DAC LUK table to be updated into the APD DAC LUK, and if the sensitivity testing is unqualified, failing.
Owner:SICHUAN TIANYI COMHEART TELECOM
Piezoelectric strain sensor, method for testing strain sensitivity of piezoelectric strain sensor and application of piezoelectric strain sensor
ActiveCN103557989AMonitor healthMonitor strain changesForce measurement using piezo-resistive materialsForce/torque/work measurement apparatus calibration/testingSilica gelLow frequency vibration
The invention discloses a piezoelectric strain sensor, a method for testing the strain sensitivity of the piezoelectric strain sensor and the application of the piezoelectric strain sensor. The sensor comprises a piezoelectric ceramic piece, a silica gel layer and a packaging layer, wherein the silica gel layer makes the sensor stressed evenly and good in sensitivity, and the packaging layer makes the sensor good in insulating property and resistant to interference of the external environment. According to the method, strain sensitivity testing is carried out through a constant-strength beam device, the strain sensitivity (mV / mu epsilon) of the sensor under the condition of different low vibration frequencies of a bridge can be tested, and the strain of a bridge structure can be indirectly reflected according to the strain sensitivity under different vibration frequencies and the voltage output of the sensor; in this way, the piezoelectric strain sensor can replace a strain gage to measure the strain of structures like the bridge under low frequencies, various shortcomings caused by using the strain gage are overcome, and the sensor has broad application prospects in bridge monitoring.
Owner:UNIV OF JINAN
Molybdenum disulfide thin film gas sensitive material, preparation method and application
InactiveCN109825816ACreate pollutionSimple processVacuum evaporation coatingMaterial analysis by electric/magnetic meansAdhesiveEvaporation
The invention discloses a molybdenum disulfide thin film gas sensitive material, a preparation method and application. A MoS2 thin film material obtained through a CVD method is adopted as the gas sensitive material. Firstly, a SiO2 / Si substrate is pre-plated with a molybdenum atom layer of a certain thickness at the deposition rate of 0.1 A / s through electronic beam evaporation; and then at a certain temperature, the SiO2 / Si substrate and S steam generate a combination reaction to generate the MoS2 thin film gas sensitive material. The two ends of the obtained substrate with a MoS2 nanosheetgrowing on the surface are plated with gold electrodes correspondingly; and a wire and the gold electrodes are bonded through a conductive silver adhesive, finally an insulation AB adhesive is used for fixing so as to increase the strength of a gas sensitivity testing device, the testing device is aged and packaged, and therefore preparation of a NO2 gas sensitive element is achieved. The preparedgas sensitive element can achieve detection to NO2 gas under room temperature, energy consumption is low, selectivity to distribution gas is good, and great significance is achieved on real-time monitoring of the NO2 gas.
Owner:UNIV OF SHANGHAI FOR SCI & TECH
Detection method for sensitivity to fire by smoke detector
Owner:深圳市高新投三江电子股份有限公司
Method for detecting conducted susceptibility
ActiveCN101520480AComplete assessmentAccurate assessmentElectrical testingComputer scienceSusceptibility testing
The invention discloses a method for detecting conducted susceptibility, which comprises the following steps: firstly, a conducted susceptibility testing principle model is established; secondly, an ultimate value curve is established; and thirdly, a sensitivity test is carried out by applying the ultimate value curve established in the second step. The invention can completely and accurately check a system level conducted sensitivity testing result, and can obtain the ultimate value curve and a sensitivity ultimate value electrical level, therefore, a system level conducted sensitivity test has an accurate testing basis and a testing standard, and the system level test check is more complete and accurate.
Owner:BEIHANG UNIV
Electromagnetic and thermal stress complex environmental sensitivity testing method for microprocessor
InactiveCN104155541ASolve the problem of difficult sensitivity testingEasy to buildElectrical testingCapacitanceElectromagnetic susceptibility
The invention relates to an electromagnetic and thermal stress complex environmental sensitivity testing method for a microprocessor. An RF interference signal source (1), a power amplifier (2), a coupling capacitor (3), a power supply distribution network (4), a tested microprocessor (5), a PCB (6), a thermostatic heating tank (7), a DC power supply (8) and an oscilloscope (9) are included. The method also provides a capacity coupling injection interference based method for testing the electromagnetic and thermal stress complex environmental sensitivity of a microprocessor. The system is easy to build, low in cost and quick and convenient in testing, and solves the problem that the testing of the electromagnetic and thermal stress complex sensitivity of the microprocessor is difficult; meanwhile, the testing method is simple, the operating process is definite, the electromagnetic sensitivity of the microprocessor at different work environment temperatures can be accurately tested within the whole frequency band ranging from 150 KHz to 1 GHz, and sample testing can be carried out at an appointed operating temperature or a certain frequency point.
Owner:THE PLA INFORMATION ENG UNIV
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