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Double-frequency laser raster interference measuring method and measuring system thereof
InactiveCN102353327AImprove anti-interference abilityImprove stabilityUsing optical meansGratingAlternating current
The invention provides a double-frequency laser raster interference measuring method and a measuring system thereof. The method comprises the following steps: utilizing a double-frequency laser to output double-frequency laser, converting a direct current signal system of common raster interference measurement into an alternating current signal system, allowing the double-frequency laser to go through a spectroscope to form a reference optical path and a measuring optical path, through motion of a raster, allowing beat frequency of measuring optical path optical beat interference fields to change, and finally using a digital phase measuring method to carry out high multiple electrical subdivision on a high multiple optical subdivision signal obtained by each optical beat interference field to complete measurement. The measuring system comprises the double-frequency laser and the first spectroscope, reflected and transmitted light beam go through the first spectroscope and form the reference optical path and the measuring optical path respectively, the reference optical path is provided with a polarization analyzer and a photoelectric detector, the measuring optical path is provided with a raster diffraction interference system, and an output optical path of the raster diffraction interference system is provided with a photoelectric detector. The method and the system have the advantages of strong anti-interference capability, good stability, convenient usage, high measuring precision and the like.
Owner:NAT UNIV OF DEFENSE TECH
0-100Pa monolithic silicon based SOI high-temperature low drift micropressure sensor and processing method thereof
InactiveCN101289160AHigh sensitivityImprove linearityTelevision system detailsImpedence networksInsulation layerOxygen
The invention relates to a super-low micro-pressure sensor of 0-100pa single-chip silicon based SOI, which has the advantages of comparatively high sensitivity and linearity, high-temperature resistance, simple technique, good consistency, low production cost and being suitable for mass production. Therefore, the invention also provides a method for processing the sensor. The chips includes an N-shaped or P-shaped silicon substrate (1), two sides of which are covered with an insulation layer (2), a polysilicon layer (3) is deposited on the surface of the insulation layer (2); the surface of the polysilicon layer is a silicon dioxide layer (4), the surface of which is a polysilicon film layer which can generate polysilicon piezo-resistance (5); polysilicon inner lead (6) doped with dense boron is connected with the resistance (5); the surface of the polysilicon internal lead (6) is covered with aluminum lead (7); the back of the chip is provided with a square-shaped opening (10); polysilicon is taken as the substrate (1), which then goes through the processes of photoetching, depositing, injecting by adopting an ion beam machine, annealing, feeding dry oxygen-wet oxygen-dry oxygen, photoetching, TMAH wet etching or RIE dry etching, photoetching, dense-boron dispreading, front steaming and plating aluminm film, leading-out weld feet and wet-etching, etc.
Owner:淮安纳微传感器有限公司
Oil-gas pipeline vibration monitoring method and device based on vibration wire type sensor
ActiveCN103808406AHigh measurement accuracyLess affected by electrical parametersSubsonic/sonic/ultrasonic wave measurementFast Fourier transformVibration acceleration
The invention relates to an oil-gas pipeline vibration monitoring method and device based on a vibration wire type sensor. According to the method, the parameters of amplitude and acceleration of a pipeline are converted into axial strain through stress on a metal bar (10) and further into the output frequency signals of the vibration wire type strain sensor (12), and by measuring the frequency change signals, measurement of the vibration acceleration of the oil-gas pipeline can be achieved; after fast Fourier transform (FFT) is performed on the vibration acceleration a (t), the vibration spectrum of the pipeline can be obtained and further the vibration period can be obtained; according to the number of waves within a quarter of the vibration period, the amplitude and the frequency in a measuring point can be obtained, and further the amplitude-time-history curve of vortex induced vibration of the pipeline can be drawn up. According to the oil-gas pipeline vibration monitoring method and device based on the vibration wire type sensor, the vibration frequency acceleration of the pipeline is converted into the strain of the vibration wire sensor, so that high-precision, anti-interference and stable-performance automatic monitoring of the vibration frequency of the oil-gas pipeline can be achieved.
Owner:PIPECHINA SOUTH CHINA CO
0-50pa single slice silicon based SOI ultra-low micro pressure sensor and its processing method
InactiveCN101290255AHigh sensitivityImprove linearityTelevision system detailsPiezoelectric/electrostriction/magnetostriction machinesOxygen ionsLinearity
The invention relates to a single chip silicon substrate SOI sensor with ultra-low micropressure of between 0 and 50 pa. The sensor has high sensitivity and linearity, high temperature resistance and simple process and is suitable for large-scale production. Therefore, the invention also provides a method for processing the sensor. A chip comprises a silicon underlayer (1); insulating layers (2) are covered on two surfaces of the silicon underlayer; a monocrystal silicon film with a thickness of 0.3 micron on the surface of the insulating layer (2) generates a resistor (3); an inner lead wire (4) is connected with the resistor (3); an opening of the back of the chip is provided with an island flap (7) or a flat film no island flap; and a composite elastic film (8) with silicon nitride and silicon dioxide is arranged between the island flap and a frame. Monocrystal silicon is used as the underlayer (1), then an opening (6) is carved on the back of the underlayer; oxygen ions are injected on the front of the silicon chip; the silicon chip is processed by anneal to form a silicon dioxide insulating layer and the monocrystal silicon film; an oxide layer and a P-type conducting layer are thermally grown on the front of the silicon chip, then a resistor area (3) and an inner lead heat pressing pin area (4) are formed on the front of the silicon chip; the monocrystal silicon film on the other areas of the front is eroded to expose the silicon dioxide layer; and the silicon nitride film deposited on the front and the back of the silicon chip and the silicon dioxide on the front are combined into a complementary composite insulating layer.
Owner:淮安纳微传感器有限公司
Calibration method of gyroscope zero drift
ActiveCN108195404ASmall zero driftImprove output accuracyMeasurement devicesGyroscopeAngular velocity
The embodiment of the invention provides a calibration method of gyroscope zero drift. The method comprises the steps that step 1, after a robot is started, the angular velocity of the gyroscope is read at each of the time intervals, in the reading process of the angular velocity, angular integration is conducted to obtain the angle of the gyroscope, and step 2 is executed; step 2, a zero drift value is determined according to the angular velocity read under the static condition of the gyroscope, and step 3 is executed; step 3, the zero drift value is subtracted from the angle of the gyroscopein the reading process to obtain the calibrated angle of the gyroscope. The method has the advantages of being simple and easy to implement, and the influence of the gyroscope zero drift value is solved to improve the accuracy of the data output of the gyroscope.
Owner:AMICRO SEMICON CORP
Pipeline pressure real-time monitoring device
InactiveCN101832787AImprove conversion accuracyHigh sensitivityConverting sensor output electrically/magneticallyElectronic switchRead-only memory
The invention provides a pipeline pressure real-time monitoring device. The current signals of a pipeline pressure sensor, a flow sensor and a temperature sensor are adjusted to the voltage signals via a signal adjusting circuit. The voltage signals pass through a multi-access electronic switch and a sampling maintaining circuit and are converted by an A / D conversion circuit. A microprocessor collects the digital signals periodically as well as records and stores calendar time information, flow information and temperature information completely in an EEPROM (Electrically Erasable Programable Read-Only Memory) and then transmits the data in the EEPROM through level conversation and communication network by a UART (Universal Asynchronous Receier / Transmitter) module to a host computer or a remote monitoring centre in real time. The invention solves the problems that data collection of the traditional pipeline leakage monitoring system has low resolution, low reliability and poor robustness and has the characteristics of small amount of construction, low cost and convenient installation and maintenance on the premise that the precision and the real-time pressure signal collection are satisfied.
Owner:HARBIN ENG UNIV
Polarization spectrum frequency stabilization system for inhibiting frequency locking zero drift
ActiveCN110854663AZero drift eliminationPrecisely control the splitting ratioLaser detailsFrequency stabilizationPhotovoltaic detectors
The invention relates to a polarization spectrum frequency stabilization system for inhibiting frequency locking zero drift. The system comprises a laser device 1, a first lambda / 2 wave plate 2, a first PBS3, a second lambda / 2 wave plate 5, a second PBS6, a first 45-degree reflector 7, a lambda / 4 wave plate 9, a second 45-degree reflector 11, an atomic gas chamber 8 and a first 50:50 non-polarization beam splitter 10, a liquid crystal extender 12, a third PBS20, a second 50: 50 non-polarization beam splitter 21, a third 50:50 non-polarization beam splitter 14, a first differential photoelectric detector 19, a second differential photoelectric detector 15, a first PID23 and a second PID13. The system is advantaged in that on the basis of polarization spectrum frequency stabilization, the zero drift amount of a spectrum is extracted through an optical method, a liquid crystal retarder is fed back and adjusted through a feedback loop, so the center of a spectrum signal is always a lockingzero point, and a problem of large long-term zero drift of polarization spectrum frequency stabilization is solved.
Owner:TIANJIN NAVIGATION INSTR RES INST
Methane gas sensor prepared by loading palladium with tin mud in tin plating process and preparation method of methane gas sensor
ActiveCN108663420ARealize comprehensive utilizationSmall particle sizeMaterial electrochemical variablesHigh volume manufacturingTin plating
The invention discloses a methane gas sensor prepared by loading palladium with tin mud in a tin plating process and a preparation method of the methane gas sensor, and belongs to the technical fieldsof semiconductor gas sensors and environment monitoring. For solving the waste problem of tin mud produced in the tin plating process, a methane sensitive material is prepared by carrying out modification treatment such as washing, drilling holes and sintering on the tin mud and carrying out metal palladium loading on the basis. The prepared gas sensor shows higher sensitivity and better responseand recovery characteristics when detecting CH4 gas. The technology for preparing the material and the gas sensor adopted by the invention have the advantages of simple technology, low raw material cost, short preparation period and the like; the technology can be used for industrialized mass production. Meanwhile, comprehensive utilization of resources is realized in aspect of raw material resources. Therefore, the sensor has a broad application prospect in detection aspect of methane gas.
Owner:NORTHEASTERN UNIV +1
Stress monitoring device and manufacturing method
InactiveCN103837273AImprove stabilityResolve interferenceForce measurement by measuring optical property variationFiberGrating
The invention provides a stress monitoring device. The stress monitoring device comprises a fiber bragg grating, an optical fiber and a strain body. A protective shell covering the sidewall is fixedly arranged on the sidewall of the strain body. A fiber outlet hole is formed in the protective shell. A protective baffle is arranged around the fiber outlet hole. In a layout space between the protective shell and the sidewall of the strain body, the first end of the optical fiber is fixed to the sidewall of the strain body, and the optical fiber is wound and fixed to the sidewall of the strain body according to a certain winding distance in the axial direction of the strain body. The fiber bragg grating is arranged on the optical fiber in the axial direction of the optical fiber. The second end of the optical fiber extends out of the protective shell through the fiber outlet hole and is connected with a wideband incident light source. A fiber bragg grating demodulation instrument is connected with the second end of the optical fiber through an optical coupler. The stress monitoring device can overcome the defects that an existing stress monitoring device is prone to electromagnetic interference, large in temperature excursion and poor in environmental adaptability. The invention further provides a manufacturing method.
Owner:8TH RES INST OF CETC
Pt1000 temperature transmitter with wide power supply range
InactiveCN104748881AEnsure safetyRealize wide range power supplyThermometers using electric/magnetic elementsUsing electrical meansElectrical resistance and conductancePower flow
The invention discloses a Pt1000 temperature transmitter with a wide power supply range. The Pt1000 temperature transmitter comprises a housing, wherein a circuit board is arranged in the housing; the circuit board comprises a main board and a bottom board which are vertically mounted; an input terminal and an output terminal are welded at left and right ends of the bottom plate respectively; three guide wires are introduced on the input terminal; the main board comprises an open circuit detecting and signal filter circuit, a main control CPU (central processing unit) and a reverse-connection-preventing circuit. According to the Pt1000 temperature transmitter disclosed by the invention, the relationship between the resistance and the temperature can be converted into the relationship between the voltage and the temperature after certain current is added, the reverse-connection-preventing circuit utilizes the one-way continuity of a diode, the safety of the circuit is guaranteed, and the wide power supply range is realized due to the reasonable model and design of elements and circuit.
Owner:VACREE TECH
Current measuring method and device
ActiveCN105067868ASmall zero driftHigh measurement accuracyCurrent/voltage measurementElectronMagnetic field
The invention provides a current measuring method and a current measuring device, which relate to the field of electronic circuits. The current measuring method comprises the steps of: adjusting a first auxiliary current, so that the sum of intensity of a magnetic field generated by the first auxiliary current flowing through an auxiliary coil of an auxiliary current and intensity of a magnetic field generated by a current to be detected is a first magnetic field intensity; acquiring value of the first auxiliary current; switching on a second auxiliary current, wherein direction of magnetic field intensity generated by the second auxiliary current is opposite to direction of magnetic field intensity generated by the first auxiliary current; adjusting the second auxiliary current, so that the sum of intensity of a magnetic field generated by the secondary auxiliary current flowing through the auxiliary coil of the auxiliary current and intensity of the magnetic field generated by the current to be detected is a second magnetic field intensity, and the first magnetic field intensity and the second magnetic field intensity are identical in magnitude and opposite in direction; acquiring value of the second auxiliary current; and carrying out differential operation on the second auxiliary current and the first auxiliary current, and calculating the current to be detected according to a difference value between the second auxiliary current and the first auxiliary current as well as number of turns of the auxiliary coil. The current measuring method can improve the measurement accuracy.
Owner:SHENZHEN XINRUIDA ELECTRIC POWER EQUIP
Ultra-small handheld ultrasonic heat flow measuring device
InactiveCN104729764ASmall zero driftHigh precisionVolume/mass flow measurementCalorimeterLiquid-crystal displayHeat flow
The invention relates to an ultra-small handheld ultrasonic heat flow measuring device comprising an ultrasonic wave transceiving module, a liquid measuring module, a temperature measuring module, an ARM controller, a liquid crystal display module, a keyboard input module, a Bluetooth serial port module and a power source management circuit. A control circuit with symmetrical ultrasonic wave transceiving is adopted by the ultra-small handheld ultrasonic heat flow measuring device, zero drift of ultrasonic measurement is further reduced, and the precision of a system is optimized.
Owner:成都声立德克技术有限公司
Vehicular weighing digital measurer
InactiveCN1952626AImprove performanceHigh precisionWeighing apparatus using elastically-deformable membersSpecial purpose weighing apparatusReaction rateDisplay device
The invention discloses an vehicle-carrying weight cyclometer counter, characterized in that the stress transuded combined weight transport units are fixed on four sets of bridge plate springs under the head and the body of the vehicle, the positive and negative connectors of the four sets of load sensors are assembled and connected with the positive and negative connectors of micro computer display device which is mounted on the gage board of the driving cap via wires, the positive and negative connectors of the display device are connected with the positive and negative connectors of the vehicle-carrying storage battery, and a electric source stabilizer is added. It characterized in that high property, high accuracy and sensibility, stable and reliable, safe, quick reaction rate, strong vibration and humiture changing and acclimatization, low energy consumption, small volume, low weight, low cost of manufacture and utilization, handiness, easy to maintenance, and can be widely used in static measurement or dynamic measurement of the dead weight and shipped weight of various of vehicles.
Owner:张立
Optical fiber hydrogen sensor based on Au@Pd nano particles and preparation method thereof, and application of optical fiber hydrogen sensor based on Au@Pd nano particles
ActiveCN110286090AIncrease contact areaShorten penetration-diffusion-equilibrium timeMaterial nanotechnologyNanosensorsHydrogen sensorHydrogen concentration
The invention relates to an optical fiber hydrogen sensor based on Au@Pd nano particles and a preparation method thereof, and application of an optical fiber hydrogen sensor based on Au@Pd nano particles. The optical fiber hydrogen sensor comprises a flexible substrate and an Au@Pd nano particle single-layer film, wherein the surface of the flexible substrate is printed with a nano grating structure, and the Au@Pd nano particle single-layer film coveres the surface of the nano grating structure. The preparation method comprises the following steps of: (1) converting Au@Pd nano-particles into hydrophobic water, and dropping the hydrophobic water onto the surface of ultrapure water, inserting the flexible substrate into the liquid surface; (2) gathering Au@Pd nano particles on one surface area of the flexible substrate printed with the nano grating structure to a mirror surface with metallic luster, separating from the liquid surface at a speed of 0.1 mm / s after 10s, performing evaporating, and removing the flexible substrate. When the optical fiber hydrogen sensor is used for hydrogen detection, the response speed is high, the stability is good, and the response speed can reach 3s when the hydrogen concentration of 0.1% is measured.
Owner:WUHAN UNIV OF TECH
Quick zero point compensation method for measuring electromagnetic flow
InactiveCN108645489AImproved zero stabilityGuaranteed measurement accuracyTesting/calibration for volume flowSignal-to-noise ratio (imaging)Engineering
The invention provides a quick zero point compensation method for measuring electromagnetic flow. The method comprises the steps of directly collecting zero state signals, and obtaining the offset amount of a signal base line according to the collecting result; according to the offset amount of the signal base line, obtaining an absolute zero point; collecting an actual measurement signal, and compensating for the actual signal through the absolute zero point in real time to complete quick zero point compensation. By means of the quick zero point compensation method, when quick excitation is conducted, interference like orthogonal interference, polarized interference, eddy current interference and common-mode interference is overcome, and the influence of the external environment on the zero points is avoided; through multiple signal control and processing technologies, the signal-to-noise ratio is increased, and zero point drift caused by the influence of the external environment is avoided; through quick compensation for zero point signals, the zero point stability of an instrument is improved, and the measuring precision of the instrument within a flow speed range is guaranteed.
Owner:CHONGQING CHUANYI AUTOMATION
Multi-mode coupling miniature electric field sensing device based on piezoelectric effect and piezoresistive effect
ActiveCN109212326AGuaranteed temperature stabilityAccurate measurementElectromagentic field characteristicsElectric field sensorHigh field
The invention discloses a multi-mode coupling miniature electric field sensing device based on a piezoelectric effect and a piezoresistive effect. The miniature electric field sensing device comprisesa horizontally placed semiconductor thin film, a horizontally placed substrate is arranged under the semiconductor thin film, a cavity structure is formed between the semiconductor thin film and thesubstrate through support of a middle interlayer, an upper surface of the semiconductor thin film is evenly provided with a piezoresistive material, the piezoresistive material comprises a transverse-transverse mode piezoelectric film and a transverse-longitudinal mode piezoelectric block, and in a transverse-transverse mode, a top surface of the semiconductor thin film is provided with the piezoelectric film; and in a transverse-longitudinal mode, a bottom surface of the semiconductor thin film is provided with the piezoelectric block. The multi-mode coupling miniature electric field sensingdevice based on the piezoelectric effect and the piezoresistive effect, provided by the invention, has the beneficial effects of being small in volume and highly integrated, effectively reducing circuit temperature drift, reducing zero drift, improving measurement accuracy, being capable of realizing electric field accurate measurement under wide band, high field intensity and complex environment,and also being capable of being mounted and maintained in the case of being electrified.
Owner:TSINGHUA UNIV
Part weighing and counting method
InactiveCN111238619AHigh precisionAvoid the impact of weighing accuracyWeighing apparatus detailsSpecial purpose weighing apparatusCounting NumberEngineering
The invention discloses a part weighing and counting method, which comprises the following steps: before and after parts are taken and placed, respectively weighing part storage boxes, comparing the weight difference of two times of weighing with the standard weight of the parts, and calculating the number of taken or placed parts; weighing the part storage box under the gravity center of the partstorage box each time. The influence of gravity center change of the part storage box on the weighing precision can be avoided, and the accuracy of the counting result can be improved.
Owner:SUZHOU RES INST OF NUAA +1
Six-dimensional force measuring platform and decoupling method thereof
ActiveCN114136524AThe decoupling method is simpleHigh measurement accuracyApparatus for force/torque/work measurementManufacturing technologyFull bridge
The invention discloses a six-dimensional force measuring platform and a decoupling method thereof, and the method aims at the above typical problems of a six-dimensional force sensor, the measuring platform is processed into a whole through an integrated manufacturing technology, four three-dimensional force sensors are arranged in the measuring platform, and the output signals of the four three-dimensional force sensors are linearly added and subtracted. The three-dimensional force and three-dimensional torque measuring platform has the advantages that the decoupling method is simple, and the measuring precision is high; each three-dimensional force sensor adopts a Wheatstone full-bridge structure as a measurement circuit, so that the influence of temperature change on the measurement result of the sensor is effectively eliminated; the sensor manufactured through integrated machining is compact in structure, free of assembly stress and connection gaps, good in following performance and consistency of input signals, small in signal conversion loss and high in measurement precision.
Owner:XI AN JIAOTONG UNIV
High-temperature solid ceramsite sand electric heating experiment device for supercritical carbon dioxide power generation
PendingCN111398105AStrong short circuit impact capabilityReduce lossHeating element shapesMaterial thermal analysisThermodynamicsElectric machine
The invention discloses a high-temperature solid ceramsite sand electric heating experiment device for supercritical carbon dioxide power generation. A high-power frequency modulation impact power supply provides power to the high-temperature solid ceramsite sand electric heating experiment device. In the high-temperature solid ceramsite sand electric heating experiment device, a variable frequency motor is fixed above a first channel steel fixing support, and a ceramsite storage device is fixed below the first channel steel fixing support. A first knife switch is fixed on the ceramsite storage device, and the other end of the first knife switch is connected with a positive electrode. A shaft of the variable-frequency motor is connected with a stirrer. Nine heating pipes are arranged in parallel between a pair of electrodes connected with an output end of the high-power frequency modulation impact power supply; a thermocouple arranged on a heating pipe; and the heating pipe and the electrodes are connected through a high-voltage crimping process. The other surface of a positive electrode plate is connected with the first knife switch; and the other surface of a negative electrode plate is connected with a second knife switch. And a ceramsite sand recoverer is positioned below the heating pipes, an upper part is welded with the second knife switch, and a lower part is welded with a third knife switch.
Owner:INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
Optical fiber temperature and vibration series integrated sensor based on blazed grating and optical fiber grating
InactiveCN109506765ASmall zero driftNo maintenanceSubsonic/sonic/ultrasonic wave measurementThermometers using physical/chemical changesElectricityGrating
The invention provides an optical fiber temperature and vibration series integrated sensor based on a blazed grating and an optical fiber grating. The sensor is used for solving the problems that in the prior art, a temperature and vibration integrated sensor is large in zero drift, needs regular maintenance and calibration and is poor in sampling precision. The sensor comprises a shell and a cable, wherein the shell is internally provided with the optical fiber grating and a blazed grating vibration measuring structure; one end of the cable extends into the shell and leads out a path of optical fiber, the optical fiber grating is engraved on the upper portion of the path of optical fiber, and the blazed grating vibration measuring structure is connected with the tail end of optical fiber.The sensor is small in size, simple in structure assembly, small in zero drift, high in electromagnetic interference resistance, free of electric noise, high in measurement precision and high in connection reliability.
Owner:NINGBO CRRC TIMES TRANSDUCER TECH CO LTD
Non-contact electrostatic intensity detection system
ActiveCN111880016ASimple structureSmall zero driftElectrostatic field measurementsCurrent sampleHemt circuits
The invention discloses a non-contact electrostatic intensity detection system. The system comprises a single-chip microcomputer, an electromagnet driving module, an electromagnetic steering engine with an antenna, an amplifying circuit and a display module. The single-chip microcomputer is connected with the electromagnet driving module; the electromagnet driving module is connected with the electromagnetic steering engine with the antenna; the electromagnetic steering engine with the antenna is connected with the amplifying circuit; the display module is connected with the single-chip microcomputer. The single-chip microcomputer drives the electromagnetic steering engine with the antenna to swing up and down through the electromagnet driving module, an alternating-current sampling electrostatic field and inductive charges collected by the electromagnetic steering engine with the antenna are amplified through the amplifying circuit and then output to the single-chip microcomputer, andthe single-chip microcomputer calculates a relative electrostatic intensity value and outputs the relative electrostatic intensity value to the display module to be displayed. The antenna structure of the direct induction type electrostatic intensity detection system is improved, and zero drift is reduced; compared with a rotary vane type electrostatic detection system and a vibration capacitancetype electrostatic detection system, the structure of the induction antenna and the design of a conditioning circuit are greatly simplified, and the cost is reduced.
Owner:WUXI GISSING AUTO ACOUSTIC PARTS TECH CO LTD
Miniature Electric Field Sensing Device Based on Multimodal Coupling of Piezoelectric Effect and Piezoresistive Effect
ActiveCN109212326BGuaranteed temperature stabilityAccurate measurementElectromagentic field characteristicsElectric field sensorHemt circuits
Owner:TSINGHUA UNIV
Grinding dynamometer for ultra-precise silicon chip
InactiveCN105014537AImprove machining accuracyImprove processing qualityGrinding feed controlAutomatic grinding controlCapacitanceDynamometer
The invention relates to a grinding dynamometer for an ultra-precise silicon chip. The grinding dynamometer for the ultra-precise silicon chip comprises an inner shaft, a grinding wheel, a three-dimensional force measurement platform and a sensing system signal processor. The measured silicon chip is fixed to the three-dimensional force measurement platform. The grinding wheel is fixed to the inner shaft to be used for grinding the measured silicon chip. The three-dimensional force measurement platform transmits grinding force in the machining process to the sensing system signal processor. The three-dimensional force measurement platform comprises an X-direction differential capacitor unit combination and a Y-direction differential capacitor unit combination. The X-direction differential capacitor unit combination and the Y-direction differential capacitor unit combination each comprise two or more capacitor unit modules which mutually form differentials. Each capacitor unit module is of a comb-shaped structure composed of two or more strip-shaped capacitor units. The dynamic characteristics of a grinding machine and the grinding performance of the grinding wheel are monitored, and the technological parameters such as the feeding speed of the grinding wheel are adjusted in real time according to the grinding force.
Owner:ANHUI KECHUANG PRODUCTIVITY PROMOTION CENT CO LTD
Main control case of nanometer-particle microscope
The invention is a kind of primary box for nano particle microscope, the box includes a high pressure amplifying model, a radiating and fan system, a primary model and a high / low voltage power system model, all of which are placed in the box independently, there has a radiating channel connected with the fan system around the primary model. The three models have relative independent electromagnetism masking structure. The functional templates are placed in the primary control model vertically in parallel. The electromagnetism masking performance is good, the irradiating effect is good, and the disturbance is small, the noise is small, the precision is higher than 0.5 nano. The whole volume is small.
Owner:上海爱建纳米科技发展有限公司
UAV data processing method and device
ActiveCN106885568BImprove real-time performanceHigh precisionNavigation by speed/acceleration measurementsCharacter and pattern recognitionSimulationUncrewed vehicle
Owner:BEIJING JINGDONG QIANSHITECHNOLOGY CO LTD
A Hall Current Sensor Circuit with Double Hall Element Structure
ActiveCN110208598BSmall zero driftHigh precisionCurrent measurements onlyVoltage/current isolationCurrent transducerDriving current
The invention provides a Hall current sensor circuit with a double Hall element structure, comprising a constant current compensation circuit (1), a zero adjustment circuit (2), a Hall element module (3), and a differential amplifier circuit (4) in the circuit. ), an output protection circuit (5), a voltage regulator circuit (6), a power supply circuit (7) and a power supply circuit (8); the Hall element module (3) is composed of two identical Hall elements in series, and the Hall element module (3) is composed of two identical Hall elements connected in series. The driving current of the Hall element is the same, and the unequal potential is compensated; the constant current compensation circuit (1) provides a constant driving current for the Hall element, and performs constant current compensation on the Hall element. The invention adopts the differential output method of double Hall elements, effectively reduces the influence of the unequal potential temperature drift of the Hall elements on the output voltage of the Hall sensor, solves the disadvantage of large zero point drift of the traditional Hall current sensor, and simplifies the circuit , The output zero drift is small, the precision is high, and the linearity is high.
Owner:SHANGHAI INST OF SPACE POWER SOURCES
Z-axis structure of accelerometer and production method thereof
ActiveCN104569491BSmall zero driftAvoid deformationAcceleration measurementAccelerometerTransmission channel
Owner:GOERTEK MICROELECTRONICS CO LTD
Automatic broadcast station lag phenomenon suppression device
ActiveCN113810142AEliminate negative-going spikesStable waveformBroadcast information monitoringTransmissionAudio power amplifierA d converter
The invention discloses an automatic broadcast station lag phenomenon suppression device, which comprises a signal receiving module, a signal adjusting module, an interference suppression module and an isolation module, and is characterized in that the signal receiving module receives an audio signal converted by a broadcast program and transmits the audio signal to the signal adjusting module; the signal adjusting module sequentially uses an amplifier and a detector to respectively amplify an audio signal and detect and adjust the amplitude of the audio signal and then transmits the audio signal to the interference suppression module; the interference suppression module compensates for and filters the amplified audio signal and then transmits the amplified audio signal to the input end of the isolation module; and the output end of the isolation module is connected with the input end of an analog-to-digital converter. Interference and clutter signals in audio signals can be well suppressed and eliminated, and it is ensured that an output signal has high purity and stability.
Owner:河南广播电视台
Optical fiber hydrogen sensor based on au@pd nanoparticles and its preparation method and application
ActiveCN110286090BImprove performanceQuick responseMaterial nanotechnologyNanosensorsNanoparticleHydrogen sensor
The invention relates to an optical fiber hydrogen sensor based on Au@Pd nanoparticles and its preparation method and application. An optical fiber hydrogen sensor based on Au@Pd nanoparticles is provided, including a flexible substrate and an Au@Pd nanoparticle monolayer film, wherein the surface of the flexible substrate is printed with a nano-grating structure, and the Au@Pd nanoparticle monolayer film is covered on a nano Grating structured surface. Its preparation is as follows: (1) Au@Pd nanoparticles are made hydrophobic and dropped onto the surface of ultrapure water, and the flexible substrate is inserted into the liquid surface; (2) Au@Pd nanoparticles are gathered onto the flexible substrate to print From the area with the nano-grating structure to the mirror surface with metallic luster, it will leave the liquid surface at a speed of 0.1mm / s after 10s, and peel off the flexible substrate after evaporation. Using the above-mentioned optical fiber hydrogen sensor for hydrogen detection has fast response speed and good stability, and the response speed can reach 3s when measuring the hydrogen concentration of 0.1%.
Owner:WUHAN UNIV OF TECH
A high-precision gas micro-differential pressure gauge
ActiveCN112254870BHigh precisionHigh measurement accuracyPressure difference measurement between multiple valvesDifferential pressurePropagation time
The invention proposes a high-precision gas micro-pressure differential meter, which includes a gas micro-pressure differential measuring device, a single-chip microcomputer, an ultrasonic transmission driving module, a first gating switch, an ultrasonic transducer A, an ultrasonic transducer B, an ultrasonic transducer Device C, second gate switch, amplifier, zero-crossing level detection module, timing gate, crystal oscillator time scale and AND gate, ultrasonic transducer A, ultrasonic transducer B and ultrasonic transducer C are all spontaneous and self-receiving formula and identical. The present invention has high accuracy of the propagation time of the ultrasonic signal measured by the above structure, and high measurement accuracy of the gas micro-pressure difference meter.
Owner:武汉德塞仪器仪表科技有限公司
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