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43results about How to "Little impact from outside interference" patented technology
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Quaternion description based rapid convergence control method of quardrotor
InactiveCN108363298AFast convergenceLittle impact from outside interferenceAdaptive controlAttitude controlQuaternion
The invention relates to a quaternion description based rapid convergence control method of a quardrotor, and belongs to the technical field of flight control. A quardrotor control system model is established, a quardrotor control system is divided into a position subsystem and an attitude subsystem, a finite-time position controller of the quardrotor is designed, a finite-time attitude controllerof the quardrotor is designed, a motor rotating speed controller of the quardrotor is obtained, and flight of the quardrotor is controlled according to the motor rotating speed controller thereof. Afinite-time control technology is used to improve the convergence speed of a closed-loop system, so that the system can be converged to an expected value more rapidly within finite time; and comparedwith a traditional PID control method, the rapid convergence control method of the quardrotor is higher in anti-interference performance and robustness, and influence of different external interference on the quardrotor in practical flight is reduced effectively.
Owner:HEFEI UNIV OF TECH
Trimming method for elongated and upright trunks of pear trees
ActiveCN106613710AEasy to trainGuaranteed top edgeCultivating equipmentsHorticulture methodsHigh densityShoot
Provided is a trimming method for elongated and upright trunks of pear trees. The method comprises following steps: creating a hedge frame mesh, filed planting of nursery stocks, cutting, bud picking, vertically binding lignified parts of new shoots to the mesh, bud-notching, basal angles and waist angles opening, thinning and branching, promoting formation of flower buds, and management of continued branchs of central branches and lateral branches. The trimming method for elongated and upright trunks of pear trees helps to realize high-density of plantation pear trees.
Owner:CHANGLI INST OF POMOLOGY HEBEI ACADEMY OF AGRI & FORESTRY SCI
An anti-interference low-voltage detection circuit
ActiveCN103604975AStable output waveformLittle impact from outside interferenceCurrent/voltage measurementCapacitanceLow voltage
The invention belongs to the field of integrated circuits, and relates to an anti-interference low-voltage detection circuit comprising a reference voltage circuit, a resistor voltage division circuit, a logical combination circuit, a shaping circuit, a recovery voltage setting circuit and a capacitance charge and discharge circuit. A resistor R1, a resistor R2, a resistor R3, and a resistor R4 of the resistor voltage division circuit are sequentially connected end to end. An initiating end R1 is connected to an input voltage VIN. The tail end R4 is grounded. The resistance value of R1 is equal to the resistance value of R4. An anode of a comparator in the logic combination circuit is connected with the reference voltage circuit. A voltage of a cathode is generated through voltage division by the resistor voltage division circuit. An output of an inverter 1 in the logical combination circuit is used for controlling charge and discharge of a capacitor. After the voltages generated by the two ends of the capacitor go through the shaping circuit, control signals are output, and at the same time, an output of a Schmidt shaping circuit of the shaping circuit is used for controlling the switching-on of an M1 and an M2 in order to set a recovery voltage. The anti-interference low-voltage detection circuit of the invention is advantageous in that: the anti-interference low-voltage detection circuit is strong in anti-interference capabilities, high in precision and accuracy, and easy to change.
Owner:SHANGHAI TAIXI ELECTRONICS TECH
Real-time clock synchronous error-correcting method for charge-controlled intelligent electric energy meter
ActiveCN104635196AEnhance clock anti-interference abilityReliable functionElectrical measurementsMicrocomputerMicrocontroller
The invention discloses a real-time clock synchronous error-correcting method for a charge-controlled intelligent electric energy meter, and relates to the technical field of electric energy metering instruments. The real-time clock synchronous error-correcting method comprises the following steps of creating an internal clock in a single chip microcomputer, and defining an array for storing an external clock; performing initial setting on the internal clock after the electric energy meter is electrified and started; generating a second signal through a timer, and adding one second onto the internal clock per second; whenever ten seconds are added onto the internal clock, sequentially performing check operation on the external clock and the internal clock, and performing corresponding synchronous error-correcting treatment on the abnormal clock. The real-time clock synchronous error-correcting method for the charge-controlled intelligent electric energy meter has the advantages that the anti-interference capability of the clock can be enhanced, the accuracy of the real-time clock in the electric energy meter is effectively guaranteed, and the effects of stability and reliability are achieved.
Owner:武汉阿迪克电子股份有限公司
Ultrasonic flow measuring method and low-power-consumption ultrasonic flow meter
PendingCN109506727AAccurate measurementImprove stabilityVolume/mass flow measurementUltrasonic sensorInterference resistance
The invention discloses an ultrasonic flow measuring method and a low-power-consumption ultrasonic flow meter. The flow meter comprises an MCU module, a power management module, an ultrasonic wave transmitting and receiving module, a temperature and pressure collecting module, a menu function module, a communication function module and a flow output function module, wherein the power management module, the ultrasonic wave transmitting and receiving module, the temperature and pressure collecting module, the menu function module, the communication function module and the flow output function module are connected with the MCU module separately; the ultrasonic wave transmitting and receiving module comprises two pairs of ultrasonic transducers, a first analog switch, a four-way ultrasonic driving circuit, a second analog switch, an automatic gain control circuit and a polarity adjusting circuit. The flow meter has the advantages of high stability and strong robustness, the noise interference resistance is high, the measurement error can be reduced, the measurement stability and precision of the existing ultrasonic flow meter are obviously improved, and in the production process of a gas field, the volume flow of natural gas can be measured reliably, stably and accurately.
Owner:XIAN ANCN INTELLIGENT INSTR
Self-heating heat responsive element and liquid level detector assembled thereby
InactiveCN101556179AAccurate measurementHigh sensitivityLevel indicators by physical variable measurementElectrical resistance and conductanceHeat conducting
The invention discloses a self-heating heat responsive element and a liquid level detector assembled thereby. The self-heating heat responsive element comprises a heating resistor, a heat-conducting medium and a heat responsive element, wherein the heat-conducting medium is respectively and tightly contacted with the heating resistor and the heat responsive element. The heat responsive element can be a heat responsive resistor, a diode and a triode. The liquid level detector comprises the self-heating heat responsive element and a voltage comparator, wherein the self-heating heat responsive element is a special element for detecting liquid level and can reliably work in a wider temperature range. A liquid level detection circuit is simple, flexible and strong in disturbance resisting capability and can exactly detect the liquid level.
Owner:瞿瑛
Terahertz detector based on multilayer-single-layer graphene junction and preparation method thereof
ActiveCN109817802ASeebeck coefficient is highGood external interferenceThermoelectric device with peltier/seeback effectThermoelectric device manufacture/treatmentWave detectionWave response
The invention discloses a terahertz detector based on a multilayer-single-layer graphene junction and a preparation method thereof. Conductive channels in the detector are composed of multilayer-single-layer graphene junctions connected with one another; the multilayer-single-layer graphene junction is an effective sensitive area for terahertz wave detection; under the irradiation of terahertz waves, the photo-thermo-electric effect electromotive force of the multilayer graphene is greater than that of the single-layer graphene, so that a combined photo-thermo-electric effect electromotive force dominated by the multilayer graphene is formed; the combined photo-thermo-electric effect electromotive force is output in a circuit in a voltage or current mode to finally obtain terahertz wave response. In addition, the combined photo-thermo-electric effect electromotive force is regulated and controlled through a gate piezoelectric field, and the responsivity and the sensitivity of the detector can be further improved. Compared with the prior art, by combining the respective advantages of the single-layer graphene and the multi-layer graphene, the responsivity of the detector can be effectively improved, so that terahertz detection with high response speed and high responsivity is realized at room temperature.
Owner:HUAZHONG UNIV OF SCI & TECH +1
Test system of propulsive water-jet pump based on echoic environment and test method thereof
ActiveCN104314801ASimple structureStrong maneuverabilityPump testingPositive-displacement liquid enginesSound powerWater jet
The invention discloses a test system of a propulsive water-jet pump based on echoic environment and a test method thereof, and the test system mainly takes a closed cycle system (for short, closed cycle system) of a comprehensive performance test bed of the propulsive water-jet pump as an infrastructure, wherein the test system comprises a vector transducer, a mechanical scanning system, an echoic tank, a data acquisition and analysis system and a propulsive water-jet pump model; the partial closed cycle system pipeline containing the propulsive water-jet pump and the mechanical scanning system are arranged in the echoic tank, the measured propulsive water-jet pump is encircled by using a measurement surface, discrete points from a vertical measurement surface sound field are sampled by combining the mechanical scanning system, and underwater radiation noise of the propulsive water-jet pump is measured by a sound intensity method. In the method, the influence of external interference noise source can be ignored in theory, in practical engineering application, the signal to noise ratio of the engineering test can be ensured to benefit for field measurement and sound power measurement of complex oscillating bodies in finite space, especially.
Owner:708TH RES INST OF CSSC
Method and device for detecting precision wafer based on parallel optical flat splitting polarized beam and phase-shifting interferometry
InactiveCN101666630BLight path design is simpleSimple structureSurface/boundary effectUsing optical meansBeam expanderOptical axis
The invention relates to a device for detecting a precision wafer based on parallel optical flat splitting polarized beam and phase-shifting interferometry. The device comprises a light source, a spatial filter, a beam expander, a polarizer, a depolarizing dispersion prism, a parallel optical flat, a quarter-wave plate and an analyzer, wherein the light source, the spatial filter, the beam expander and the polarizer are arranged on a first optical axle in sequence, the analyzer, the quarter-wave plate, the depolarizing dispersion prism, the parallel optical flat and the surface of an externalobject to be measured are arranged on a second optical axle in sequence, and the first optical axle is perpendicular to the second optical axle.
Owner:HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
Electricity-taking method and device for detecting battery internal resistance
ActiveCN102175976AHigh Common Mode Rejection RatioLittle impact from outside interferenceResistance/reactance/impedenceElectrical testingElectricityInternal resistance
The invention discloses an electricity-taking method and device for detecting battery internal resistance. The method comprises the following steps of: generating at least a positive supply circuit and a negative supply circuit by a detected battery to supply power for at least one detecting circuit; and performing sampling the positive supply circuit and the negative supply circuit accurately. By using the electricity-taking method and device for detecting battery internal resistance, two or more than two detected batteries can be detected by using one detecting circuit; and the internal resistance of the detected battery can be detected on line or off line in real time and ultra-high common-mode rejection ratio can be obtained; the external influence on the detection precision is small, and the precision error can be less than 0.1 milliohm; the electricity-taking method and device for detecting battery internal resistance are applicable to various detection environments.
Owner:SHENZHEN HEADSUN TECH
Pulse wave blood pressure simulator and simulating method
ActiveCN105078430AImprove accuracyImprove stabilityEvaluation of blood vesselsAngiographySphygmomanometerEngineering
The invention belongs to the technical field of medical instruments and provides a pulse wave blood pressure simulator which comprises a blood pressure simulating device, a pressure sensor, a pulse wave simulating device and a controller. The blood pressure simulating device is used for simulating human pressure signals and comprises a flexible rubber hose filled with gas and capable of elastically extending and contracting and a squeezing component used for squeezing the flexible rubber hose, the flexible rubber hose is arranged in the squeezing device, the pressure sensor is used for detecting pressure in the flexible rubber hose and connected with the flexible rubber hose, the pulse wave simulating device is used for simulating human pulse wave signals and comprises an inflation pump used for providing pulse airflow, the controller is used for controlling working state of the blood pressure simulating device and the pulse wave simulating device and collecting information fed back by the pressure sensor, and the blood pressure simulating device, the pulse wave simulating device and the pressure sensor are all electrically connected with the controller. The pulse wave blood pressure simulator can truly and accurately simulate human blood pressure and pulse signals and can be used for accurately detecting blood pressure. The invention further provides a simulating method matched with the pulse wave blood pressure simulator.
Owner:SHENZHEN RAYCOME HEALTH TECH
Transmission circuit of digital output signals in infrared focal plane array reading circuit
ActiveCN103256987ALittle impact from outside interferenceLittle external interferenceRadiation pyrometryComparators circuitsAnalog signal
The invention discloses a transmission circuit of digital output signals in an infrared focal plane array reading circuit. The transmission circuit of the digital output signals in the infrared focal plane array reading circuit comprises a digital output signal collecting circuit and a current comparator circuit. The digital output signal collecting circuit comprises n digital output signal collecting units, and each digital output signal collecting unit converts collected digital signals into analog signals and outputs the analog signals. The current comparator circuit is used for converting the analog signals input by the digital output signal collecting units into the digital signals and outputting the digital signals. According to the transmission circuit of the digital output signals in the infrared focal plane array reading circuit, the digital output signal collecting units convert the collected digital signals into the analog signals and transmit the analog signals, the analog signals are current signals, relative to voltage signals, disturbing influence on the current signals from the external in the process of transmitting is small, after transmission is finished, when output is needed, the current comparator circuit converts the analog signals into the digital signals, and therefore external disturbance on the signals in the process of transmitting can be reduced.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Radar signal simulation generation method based on SOC platform
ActiveCN114676080AImprove developmentEasy maintenanceElectric digital data processingICT adaptationInterference (communication)Coded element
The invention discloses a radar signal simulation generation method based on an SOC platform. The method comprises the following steps: constructing a hardware platform based on an SOC platform chip and a DAC structure; calculating control parameters such as pulse width, period and code element number; pulse waveform control parameters are calculated; sending each control parameter to a corresponding part of the FPGA through an AXI bus; a control instruction is issued through the AXI bus, and the DDS is controlled to periodically generate waveform data; the waveform data is output to the DAC and converted into analog signals to be output. According to the system, the performance of the SOC platform chip is fully exerted, control parameter calculation related to floating point operation is put in an ARM embedded system, signal generation with the high real-time requirement is put in an FPGA, communication between the ARM embedded system and the FPGA is achieved through a bus in the SOC platform chip, the overall structure is simpler and more convenient, the influence of external interference is small, and the reliability of the system is improved. And development and maintenance of technicians are facilitated.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
High-resolution image reconstruction method in scattering scene
ActiveCN113298700AHigh precisionQuality improvementGeometric image transformationNeural architecturesReconstruction methodNeural network nn
A method for reconstructing a high-resolution image in a scattering scene comprises the following steps: S1, for different scattering scenes, measuring a point spread function (PSF) of each scattering scene by using a PSF measuring device, and extracting a line spread function (LSF) in a dimensionality reduction manner according to the measured PSF so as to characterize each scattering scene, and classification of different scattering scenes is realized; and S2, according to the classification result of the scattering scene, carrying out image reconstruction on a one-dimensional signal collected by a calculation ghost imaging system in the scattering scene by adaptively adopting an image reconstruction deep convolutional neural network so as to obtain a high-resolution image, wherein a training set of the reconstruction network comes from one-dimensional data collected in a scattering scene which is most matched with the scattering scene classification features, and self-adaptive high-resolution image reconstruction in different scattering scenes is realized. According to the method, different scattering scenes can be quickly classified, and quick and high-resolution imaging in the different scattering scenes is realized.
Owner:SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV +1
Real-time clock synchronization error correction method for fee-controlled smart energy meters
ActiveCN104635196BEnhance clock anti-interference abilityReliable functionElectrical measurementsMicrocontrollerArray data structure
A real-time clock synchronous error correction method for a cost-controlled intelligent electric energy meter, relating to the technical field of electric energy metering instruments, comprising the steps of: first creating an internal clock inside a single-chip microcomputer, and defining an array for storing external clocks; powering on the electric energy meter Initially set the internal clock after startup; then generate a second signal through the timer, and add 1 second to the internal clock every second; every time the internal clock is added for 10 seconds, the external clock and the internal clock are checked in turn , and perform corresponding synchronous error correction processing on the abnormal clock. The invention can enhance the anti-interference ability of the clock, effectively guarantee the accuracy of the real-time clock in the electric energy meter, and is stable and reliable.
Owner:武汉阿迪克电子股份有限公司
Pulse wave blood pressure simulator and its simulation method
ActiveCN105078430BImprove accuracyImprove stabilityEvaluation of blood vesselsAngiographySphygmomanometerPulse wave
Owner:SHENZHEN RAYCOME HEALTH TECH
Sphygmomanometer testing device capable of simulating blood pressure signal emitted by human body
PendingCN109330577AImprove accuracyImprove stabilityEvaluation of blood vesselsAngiographySphygmomanometerHuman body
The invention discloses a sphygmomanometer testing device capable of simulating a blood pressure signal emitted by the human body. The device comprises an airbag device, an extrusion assembly in contact connection with the airbag device, a stepping motor connected to the extrusion assembly, a driving circuit connected to the stepping motor and an MCU controller connected to the driving circuit which are all arranged in a sphygmomanometer testing device body; the airbag device is used for generating an simulated airflow adjustable in amplitude and frequency and enabling a sphygmomanometer to detect and input demanded pulsating flow in order to simulate and generate a blood pressure pulse signal of the human body; the MCU controller is used for generating a control signal according to a specified blood pressure adjustment signal and controlling the driving circuit to drive the stepping motor to extrude the airbag device in order to generate the simulated airflow adjustable in amplitude and frequency, and thus the sphygmomanometer can detect and input the demanded pulsating flow. The provided sphygmomanometer testing device can truly and accurately simulate the blood pressure signal of the human body and accurately detect the accuracy of the sphygmomanometer.
Owner:QINGDAO YASEE MEDICAL EQUIP CO LTD
Serial communication system and method of single chip microcomputer
InactiveCN107707275AHigh voltage and currentImprove accuracyTransmission control/equlisationRepeater circuitsVIT signalsSignal lines
The invention provides a serial communication system and method of a single chip microcomputer. The serial communication system of the single chip microcomputer comprises: a first single chip microcomputer, a first signal sending port, a first signal receiving port, a first signal receiving module and a first signal sending module; and a second single chip microcomputer, a second signal sending port, a second signal receiving port, a second signal receiving module and a second signal sending module, wherein the first signal sending module is connected with the second signal receiving module via a signal line; the second signal sending module is connected with the first signal receiving module via a signal line; and the signal line is connected with a DC power supply with an output voltagebeing greater than +5.5V. According to the serial communication system of the single chip microcomputer provided by the invention, the DC power supply with the output voltage being greater than +5.5Vis connected to the signal line, thereby increasing the voltage and the current on the signal line, reducing the influence of the external interference to the information transmitted on the signal line, and improving the information transmission accuracy between the single chip microcomputers.
Owner:厦门芯阳科技股份有限公司
LED lamp energy-saving control system
InactiveCN105764186AImprove anti-interference abilityReduce voltageElectrical apparatusElectroluminescent light sourcesControl signalControl system
The invention relates to an LED lamp energy-saving control system, comprising a power supply module, an LED driving module, an environment sensing module, a control module and an LED lamp; wherein the power supply module provides power for the whole control system, the environment sensing module is connected with the control module, the output end of the control module is connected with the LED driving module, the LED driving module is connected with the LED lamp; the LED driving module drives the LED lamp through a control signal outputted by the control module, the core component of the environment sensing module is a photoresistor, the environment sensing module acquires a surrounding environment luminance signal of the LED lamp and transmits the luminance signal to the control module, the control module comprises a microprocessor and a sampling circuit, the control module processes the signal transmitted by the environment sensing module and then outputs a control signal. The LED lamp energy-saving control system is simple in circuit, thus electric energy is saved to a great extent, and the service life of the LED lamp is prolonged. The whole LED lamp energy-saving control system achieves intelligent and energy-saving effects, and improves an illumination environment, in addition, the stable brightness adjustment mode enables illumination of the LED lamp to be safer and more comfortable, thereby achieving a big application value.
Owner:SHANGHAI UNIV
System and method for measuring resonant frequency of MEMS piezoelectric actuators
InactiveCN111707350ALittle impact from outside interferenceFast and accurate measurement requirementsSubsonic/sonic/ultrasonic wave measurementElectrical testingCantilevered beamPiezoelectric actuators
The invention relates to a system for measuring the resonant frequency of MEMS piezoelectric actuators. The system comprises one or more piezoelectric actuators, a base used for installing the piezoelectric actuators, a driving power supply device used for driving the piezoelectric actuators, a laser pointer and a fluorescent screen used for displaying laser. The piezoelectric actuatorsare of a cantilever beam structure and each comprises a copper sheet with the end fixed to the base, a piezoelectric ceramic piece to be tested bonded to the suspension portion of the copper sheet, and a reflector bonded to the piezoelectric ceramic piece and located at the free end of the cantilever beam structure. The laser generated by the laser pointer is reflected by reflecting mirrors of the piezoelectric actuators in sequence and then a graph is displayed on the fluorescent screen; and the driving power supply device applies voltages with different frequencies to the piezoelectric ceramic piece. Compared with the prior art, the performance of the MEMS piezoelectric actuator in actual use can be rapidly and accurately evaluated, and the system has the advantages of being high in operability, low in cost, easy, convenient and rapid to install and measure and the like.
Owner:SHANGHAI INST OF TECH
Treatment and purification method of dyeing wastewater produced by wood processing
InactiveCN108640197AGood for adsorption and degradationStrong oxidation abilityWater/sewage treatment by irradiationWater contaminantsPurification methodsOrganic dye
The invention relates to the technical field of wood processing and treating, and discloses a treatment and purification method of dyeing wastewater produced by wood processing. According to the treatment and purification method of dyeing wastewater produced by wood processing, prepared mangano-manganic oxide nanoparticles grow and attach onto pore channels of a porous structure of active zeolite,so that a porous compound doped with rod-like mangano-manganic oxide is obtained; and thus, synergistic effects and interface effects can be produced so as to facilitate adsorption and degradation ofdye molecules. In the presence of light irradiation, electrons on photo-degradable materials are excited so as to produce transition, so that photo-induced electron holes are formed so as to furthercombine with oxygen to produce superoxide anions with super-strong oxidability; and thus, organic dyes, which are difficult to degrade, are degraded into carbon dioxide and water. Therefore, degradation rate of dyes by adopting the treatment and purification method can be up to 99% or above; and reuse rate of the porous compound doped with rod-like mangano-manganic oxide can be up to 10 times or above. Tests have proven that degradation rate of methylthionine chloride within 60 minutes by adopting the treatment and purification method can be up to 100%; moreover, the treatment and purificationmethod has the advantages of being energy-saving, efficient, green, safe, capable of ensuring complete degradation, free of secondary pollution and so on.
Owner:阜南县大喜柳编工艺品有限公司
A method for testing low-frequency voltage/current fluctuation parameters of solar cell modules
ActiveCN110380686BLittle impact from outside interferenceGuaranteed accuracyPhotovoltaic monitoringPhotovoltaic energy generationLow noiseTerminal voltage
The invention discloses a method for testing low-frequency voltage / current fluctuation parameters of a solar cell module. By placing the photovoltaic module under test in a dark room, applying a bias voltage, recording the bias current I and the bias voltage V, and testing the The voltage at both ends of the photovoltaic module is connected to the AC low-noise signal amplifier, and the low-frequency voltage fluctuation signal is collected and calculated to obtain the power spectral density data of the low-frequency voltage / current fluctuation of the photovoltaic module module under test; the point-frequency noise voltage value f is calculated separately n , RMS value of bandwidth noise voltage v n , 1 / f noise amplitude B, 1 / f noise corner frequency f c Parameters such as the noise spectrum value ratio μ, etc., are recorded in the low-frequency voltage / current fluctuation characteristic parameter table of the component under the bias current. The relevant information contained in the low-frequency voltage or current signal fluctuation signal proposed by the present invention can be used as one of the sensitive and non-destructive means for characterization and evaluation of solar cell life and reliability.
Owner:成都金螺科技有限公司
A high-bandwidth radio frequency signal arrival time measurement device and method
ActiveCN109347549BHigh time measurement resolutionHigh precision time measurement resolutionElectromagnetic transmittersLow noiseNoise (radio)
The invention provides a device for measuring the time of arrival of a high-bandwidth radio frequency signal. The device comprises the following parts: an electrooptical modulator connected with a radio frequency signal to be measured; a reference signal source comprising a femtosecond laser device and a low-noise radio frequency signal source, wherein the femtosecond laser device is connected with the electrooptical modulator, and is located in a phase-locked loop, and the low-noise radio frequency signal source is connected to the input end of the phase-locked loop; and a photoelectric detector connected with the electrooptical modulator. According to the device for measuring the time of arrival of the high-bandwidth radio frequency signal, which is disclosed by the invention, the extremely low-noise femtosecond laser device is locked onto the low-noise radio frequency source through a phase-locked loop technology; the reference signal source with excellent noise performance is modulated through the electrooptical modulator according to the radio frequency signal to be measured; time of arrival information can be demodulated only by measuring an amplitude value of the modulated signal, so that high-precision time measurement resolution is realized; and furthermore, a laser pulse string is little interfered and affected by the outside in a transmission process, so that introduced external noise is lower.
Owner:SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
Six-type shielding network wire
ActiveCN101620896AGuaranteed shielding effectLittle impact from outside interferenceFlexible cablesFlexible conductorsCopper wireAlclad
The invention relates to a shielding network wire, in particular to a six-type shielding network wire with good shielding effect and reduced external disturbance influence and a production method thereof. The six-type shielding network wire comprises 8 core wires with pitches of brown-brown and white 12.6 mm, blue-blue and white 18.5 mm, green-green and white 16.8 mm and orange-orange and white 11.6 mm, each group of core wires are wrapped by a single-surface compound aluminium foil with thickness of 0.025 mm so as to ensure the core wires are completely wrapped in the single-surface compound aluminium foil, the metal of the single-surface compound aluminium foil inwards faces, and 4 groups of wrapped core wires are twisted; a tinned copper wire is added to the 4 groups of twisted core wires to be weaved with a copper wire, the tinned copper wire is placed inside a weaving wire, and finally the weaved copper wire is used as a jacket to wrap and is directly wrapped into coils. The invention solves the problem of the factors influencing data transmission, each group of twisted wires are completely shielded, thereby the external disturbance influence to the integral network wire is reduced, and the rigidity of the network wire is less than the bending of the same; and in addition, the invention overcomes the shortages of the prior products in the market and is a creative product.
Owner:SHENZHEN LIANJIAXIANG SCI & TECH
A special circuit for laser ranging and a ranging method based on the circuit
ActiveCN112014853BReserved function moduleReduce areaOptical rangefindersElectromagnetic wave reradiationMicrocontrollerPower-on reset
The invention discloses a special circuit for laser ranging and a distance measuring method based on the circuit. Microcontroller, pulse phase IP core, first ADC module, second ADC module, digital peripherals, programmable multi-phase phase-locked loop, power management module, and storage module; the photoelectric processing chip consists of the first amplifier and the second amplifier , capacitors and photodiodes; the laser driver chip consists of a power management module, a first low-dropout linear regulator, a second low-dropout linear regulator, a third low-dropout linear regulator, a power-on reset module, and a pulse generator , Programmable multi-phase phase-locked loop, digital logic module, signal error detection module. The invention has the advantages of high circuit integration, small area and little influence by external interference, greatly reduces the hardware cost of the circuit, and can realize long-distance and high-precision distance measurement.
Owner:HANGZHOU GREAT STAR IND CO LTD
Number checking device
InactiveCN101508357ALittle impact from outside interferencePoints are accuratePackaging automatic controlStop signalCounter device
The invention relates to a counting machine, which comprises a material emptying device, a material collecting device, infrared counting devices, a counting device, and a product track, wherein the product track is arranged between the material emptying device and the material collecting device; the infrared counting devices are arranged on both sides of the product track; the counting device is connected with the infrared counting devices; and the counting device is connected with the material collecting device. Compared with the prior art, the counting machine has the advantages that the counting machine is little influenced by external disturbance, has accurate counting, and uses a high-speed high-sensitivity multifunctional counter which can set a standard value at will, and when the counting value is equal to the set value, a stopping signal is given; the material receiving device can regulate speed steplessly and set the speed at will according to requirement; and the whole machine is light and convenient, simple in operation and low in manufacturing cost.
Owner:SHANGHAI LAIMU ELECTRONICS
A multi-contact electrical switch
Owner:STATE GRID HENAN ELECTRIC POWER COMPANY ANYANG POWER SUPPLY
Electricity-taking method and device for detecting battery internal resistance
ActiveCN102175976BHigh Common Mode Rejection RatioLittle impact from outside interferenceResistance/reactance/impedenceElectrical testingElectricityInternal resistance
The invention discloses an electricity-taking method and device for detecting battery internal resistance. The method comprises the following steps of: generating at least a positive supply circuit and a negative supply circuit by a detected battery to supply power for at least one detecting circuit; and performing sampling the positive supply circuit and the negative supply circuit accurately. By using the electricity-taking method and device for detecting battery internal resistance, two or more than two detected batteries can be detected by using one detecting circuit; and the internal resistance of the detected battery can be detected on line or off line in real time and ultra-high common-mode rejection ratio can be obtained; the external influence on the detection precision is small, and the precision error can be less than 0.1 milliohm; the electricity-taking method and device for detecting battery internal resistance are applicable to various detection environments.
Owner:SHENZHEN HEADSUN TECH
A kind of shaping method of slender and erect trunk shape of pear tree
ActiveCN106613710BEasy to trainGuaranteed top edgeCultivating equipmentsHorticulture methodsShootPear tree
Provided is a trimming method for elongated and upright trunks of pear trees. The method comprises following steps: creating a hedge frame mesh, filed planting of nursery stocks, cutting, bud picking, vertically binding lignified parts of new shoots to the mesh, bud-notching, basal angles and waist angles opening, thinning and branching, promoting formation of flower buds, and management of continued branchs of central branches and lateral branches. The trimming method for elongated and upright trunks of pear trees helps to realize high-density of plantation pear trees.
Owner:CHANGLI INST OF POMOLOGY HEBEI ACADEMY OF AGRI & FORESTRY SCI
Terahertz detector based on multi-layer-single-layer graphene junction and its preparation method
ActiveCN109817802BSeebeck coefficient is highGood external interferenceThermoelectric device with peltier/seeback effectThermoelectric device manufacture/treatmentWave detectionHemt circuits
Owner:HUAZHONG UNIV OF SCI & TECH +1
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