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65results about How to "Eliminate common mode interference" patented technology
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Indoor model experience device with existing tunnel affected by double subway construction
InactiveCN103115788AImprove scalabilitySimulation is accurateUsing electrical meansStructural/machines measurementRubber membraneFull bridge
The invention belongs to the field of tunnel engineering, and particularly relates to an indoor model experience device with an existing tunnel affected by double subway construction. The experience device mainly comprises a subway excavation simulating device, a tunnel model, a strainometer, a displacement support frame, a displacement meter, and the like. A hollow aluminum pipe is arranged in the middle of the tunnel excavation simulating device, a rubber membrane filled with water is arranged on the periphery of the tunnel excavation simulating device, and soil deformation which is caused by the tunnel excavation is simulated by drainage of water with a certain size. The tunnel model is simulated by aluminum alloy pipes, and the outer wall of the tunnel model is pasted with the strainometer in a full-bridge mode to achieve strain measurement on the existing tunnel. The displacement meter is fixed on the displacement support frame, and measurement on longitudinal settlement of the existing tunnel can be achieved. The indoor model experience device with the existing tunnel affected by the double subway construction can conveniently and effectively simulate the existing tunnel deformation caused by the double subway construction of a city, and has important reference value for establishing a tunnel construction security traversing technology standard and an adjacent structure security protective measurement.
Owner:UNIV OF SHANGHAI FOR SCI & TECH
Intelligent door control system for rail train doors
ActiveCN101936110AImprove intelligenceEliminate common mode interferencePower-operated mechanismBus networksMotor driveControl signal
The invention relates to an intelligent door control system for rail train doors. A door control system network composed of fieldbuses is arranged between the train top bus and the train door system. The door control system network comprises gateway modules, node modules and a CAN bus, wherein each gateway module is connected with the train top bus, and used for receiving a control signal transmitted by the train top bus and converting the control signal into a CAN bus signal which can be identified by the node modules; and each node module transmits the CAN bus signal to a motor drive modulein the train door system in a CAN communication mode; and the motor drive modules drive the train doors to move. One gateway module corresponds to one set of node modules, the same number of node modules, and the same number of train doors. The door control system network is also provided with an independent monitoring diagnostic module, and a reserved overhaul interface on the monitoring diagnostic module is used for overhauling the door control system by running maintenance software.
Owner:SOUTHEAST UNIV
Broken rail real-time detection device and detection method thereof
InactiveCN101954915AEliminate common mode interferenceOrbit primary parameters are smallRailway auxillary equipmentRailway profile gaugesElectricityCurrent sensor
The invention relates to a railway track detection device and a use method. The broken rail detection device comprises two steel rails of a rail-mounted locomotive, and is mainly characterized in that at least a pair of electric short wires are arranged between the two steel rails; the electric short wires and the two steel rails surround into an electrical isolation unit; at least one current sensor is arranged on one steel rail of the electrical isolation unit; and the current sensor is electrically connected with a current signal receiving and processing unit which outputs a broken rail signal to an output device. The invention has the advantages of adopting a direct short-circuit jointless track circuit; the circuit can not be used as the traditional track circuit although a shunt dead section exists; and the jointless track circuit is superior in the broken rail detection aspect because of the simple device thereof.
Owner:LANZHOU JIAOTONG UNIV
Gas concentration analyzing device and measurement equipment thereof and analyzing method
PendingCN109655423AExtended service lifeSmall signal driftColor/spectral properties measurementsTest sampleFunctional Relationship
The invention discloses measurement equipment for a gas concentration analyzing device, the gas concentration analyzing device, a gas concentration calibration method and analyzing method. The measurement equipment comprises a light source, an optical beam splitter, a measurement light pool, a measurement terminal detector and a reference terminal detector. The measurement light pool is used for storage of to-be-tested sample gas; the measurement terminal detector is used for measuring first light intensity of a first light beam passing through the measurement light pool, wherein the first light beam is formed by a light beam, emitted by a measurement light source, passing through the optical beam splitter. The reference terminal detector is used for measuring second light intensity of a second light beam, emitted by the light source, passing through the optical beam splitter. A functional relationship or a curvilinear relationship between the first light intensity and the second lightintensity is calculated according to the Lambert-Beer law to further obtain concentration of target to-be-tested gas in the sample gas.
Owner:南京木达环保科技有限公司
Brain electricity collecting device
ActiveCN103519807AEliminate common mode interferenceEliminate distractionsDiagnostic recording/measuringSensorsVIT signalsHigh impedance
The invention discloses a brain electricity collecting device which particularly comprises an N-channel brain electricity collecting electrode, a brain electricity signal collector, a transmission module and a data receiving module. Brain electricity signals acquired by the N-channel brain electricity collecting electrode are fed into a high-impedance front buffer stage and then are converted into digital signals by a high-precision brain electricity collecting and converting module, the digital signals are transmitted into a digital signal processor, and processed signals are transmitted to the data receiving module according to particular requirements. The brain electricity collecting device has the advantages that the brain electricity collecting device is particularly provided with a 24-bit high-precision analog-digital conversion chip to directly acquire signals of relevant positions of the brain of a person, and digital signals converted by corresponding channels are subtracted from the signals, so that common-mode interference, device noise and other relevant background noise can be eliminated, and basically pure brain electricity signals can be obtained.
Owner:UNIV OF ELECTRONIC SCI & TECH OF CHINA
Traceable synchronous measurement ruler-based mixed double-light source laser range finding device and method
ActiveCN104155642AIncrease flexibilityOvercome the shortcomings of not being directly traceableUsing reradiationFrequency stabilizationPhase difference
A traceable synchronous measurement ruler-based mixed double-light source laser range finding device and method belongs to the technology of phase laser range finding. The range finding device comprises a measurement ruler generation unit, a laser frequency shift unit, abeam expanding collimating mirror set, a measurement optical path and a circuit unit. The range finding method comprises a step 1 of starting a frequency reference laser and a double longitudinal mode frequency stabilization He-Ne laser, a step 2 of taking one beam as a reference laser beam, and another beam as a measurement beam, a step 3 of taking a formula defined in the specification as an accurate measurement ruler, a step 4 of taking a formula defined in the specification as a rough measurement ruler, and a step 5 of moving a measurement cube-corner prism to a target end for obtaining phase differences of the accurate measurement ruler and the rough measurement ruler Phi 1 and Phi 2 respectively and obtaining a to-be-tested distance value through a formula. The invention solves a problem that a device and method for achieving large power, synchronism of multiple measurement rulers and traceability is not available in the phase laser range finding technology, and the device and method provided by the invention is characterized by being high in range finding precision and measurement efficiency, and good in stability and real-time performance.
Owner:HARBIN INST OF TECH
GSM (Global System for Mobile Communications) based intelligent safe protection system
InactiveCN103942933AEasy to operateEasy to useAlarmsProgramme total factory controlEngineeringAcousto-optics
The invention discloses a GSM (Global System for Mobile Communications) based intelligent safe protection system. The GSM based intelligent safe protection system comprises a detector module, a safe protection host, an intelligent phone, a remote control module and an appliance control device; the safe protection host comprises an MCU (Microprogrammed Control Unit) main control module, a power supply module, a display module, an acousto-optic alarm, a GSM communication module and a wireless transmit-receive module A; the MCU main control module is in signal connection with the detector module through a 485 repeater; the appliance control device comprises a main control CPU (Central Processing Unit), a wireless transmit-receive module B and a repeater driving module. The GSM based intelligent safe protection system has the advantages of expanding the safe protection range and not losing the safe protection effect when being used due to a 485 bus and in combination of the repeater, achieving voice protection, short message protection, remote control protection and the like, being complete in function, good in protection effect and particularly applicable to areas such as residential areas, office buildings and rural areas, enabling one safe protection host to manage a district of communities, achieving information real-time transmission between the detector module, the appliance control device, the safe protection host and the client intelligent phone and achieving real-time control.
Owner:SHENZHEN JIMI SOFTWARE CO LTD
Active filtration method and device for simultaneously restraining difference mode interference and common mode interference
InactiveCN105703366AEliminate differential modeEliminate common mode interferenceActive power filteringAc network to reduce harmonics/ripplesFiltrationCurrent sensor
The invention discloses an active filtration method and device for simultaneously restraining difference mode interference and common mode interference. The method comprises the following steps that (1) a plurality of active power filters are respectively bridged between each power supply bus and each neutral line, and meanwhile, a current sensor is arranged on each power supply bus, and each current sensor is respectively connected to the corresponding active power filter bridged between each power supply bus and each neutral line; (2) each current sensor monitors harmonic interference current on each power supply bus; and (3) each active power filter works based on a feedback control principle, so that the harmonic interference current on the power supply bus, which is monitored by each corresponding current sensor, is minimum, and meanwhile, the harmonic current of the neutral line is minimum. According to the active filtration method and device, through a connection way of two active power filters and the ground wire, a certain compensation harmonic current is injected into the power supply buses, and meanwhile, the difference mode interference and the common mode interference on the power supply buses are removed, and the low-frequency interference conduction and radiated emission quantity of the long distance transmission cable of the power grid can be effectively controlled.
Owner:CHINA SHIP DEV & DESIGN CENT
Multi-frequency aliasing prevention traceable synchronous measuring tape double-light-source laser ranging device and method
ActiveCN104035088AIncrease flexibilityOvercoming non-direct traceabilityUsing reradiationLight sourceGenerating unit
A multi-frequency aliasing prevention traceable synchronous measuring tape double-light-source laser ranging device and method belongs to the phase laser ranging technology. The device comprises a measuring tape generating unit, a laser frequency shift unit, a beam expanding collimation lens group, a measuring light path and a circuit unit. The method comprises the steps of, firstly, starting a frequency reference laser device, a double-longitudinal-mode frequency stabilization He-Ne laser device and a semiconductor laser device; secondly, taking one beam as a reference laser beam and taking the other beam as a measuring laser beam; thirdly, taking c / Iv2-v3I as a fine measurement tape; fourthly, taking c / Iv1-v2I as a rough measurement tape; fifthly, moving a measuring pyramid prism to a target end to obtain the phase differences (i) phi ( / i) 1 and (i) phi ( / i) 2 of the fine measurement tape and the rough measurement tape; lastly, obtaining a measured distance value through formulas. The multi-frequency aliasing prevention traceable synchronous measuring tape double-light-source laser ranging device and method solves the problems that superlong wavelengths and ultrashort wavelengths cannot be generated synchronously and laser tapes are incapable of performing direct tracing and have nonlinear periodic errors and frequency aliasing, and has the advantages of being high in measuring efficiency, precision, stability and practicality.
Owner:HARBIN INST OF TECH
Superheterodyne and heterodyne anti-aliasing laser ranging device and method
ActiveCN104049248BIncrease flexibilityOvercome the shortcomings of not being directly traceableUsing reradiationAnti-aliasingPhase difference
Owner:HARBIN INST OF TECH
Double-longitudinal mode laser ranging device and method based on traceable synchronous measuring tapes
ActiveCN104166131AIncrease flexibilityOvercoming non-direct traceabilityUsing reradiationLaser rangingPrism
A double-longitudinal mode laser ranging device and method based on traceable synchronous measuring tapes belongs to phase laser ranging technology. The ranging device includes a measuring tape generation unit, a laser frequency shift unit, a beam-expanding collimating lens group, a measuring light path and a circuit unit. The ranging method includes the following steps: step one, starting a frequency reference laser and a double-longitudinal mode frequency stabilization He-Ne laser; step two, using one beam as a reference laser beam, and using the other beam as measuring laser; step three, using c / |v2-v3| as a precise measuring tape; step four, using c / |v1-v2| as a rough measuring tape; and step five, moving a measuring cone prism to a target end, obtaining phase differences phi1 and phi2 of the precise measuring tape and the rough measuring tape respectively, and finally obtaining measured distance values through formulas. The double-longitudinal mode laser ranging device and method based on the traceable synchronous measuring tapes in the invention solves the problem that phase laser ranging technology lacks a laser ranging device and method capable of giving consideration to large power, multi-measuring tape synchronization and traceability, and has the characteristics of high ranging precision, high measuring efficiency, and strong stability and real-time performance.
Owner:HARBIN INST OF TECH
Controller wire throwing structure integrating EMC module
PendingCN108617156ASuppression of high frequency signalsEliminate common mode interferenceScreening gaskets/sealsHermetically-sealed casingsBusbarEngineering
The invention discloses a controller wire throwing structure integrating an EMC module. The controller wire throwing structure comprises a magnetic ring fixing base, wherein a vertical magnetic ring is fixed inside the front end of the magnetic ring fixing base, a filtering module is fixed at the rear end, an insertion structure of a high-voltage busbar is fixed to the front end surface of the magnetic ring fixing base, a through hole penetrating the center of the magnetic ring is formed in the magnetic ring fixing base, the front end of the through hole is communicated with the insertion structure, the rear end of the through hole is communicated with the filtering module, and the high-voltage busbar is in lap joint with the filtering module by means of the insertion structure and the through hole sequentially. A part, connected with a controller shell body, in the wire throwing structure is combined by adopting the specially-made tail cover and a sealing ring, the structure is simple, and the cost is considerable. The installation and disassembly of the busbar are convenient, the maintenance is convenient and the cost is considerable on the premise of ensuring certain sealing performance. The EEMC module and the wire throwing structure are combined together to form the wire throwing structure integrating the EEMC module, thereby further reducing the size of the controller.
Owner:SHANGHAI AUTOMOBILE GEAR WORKS
Non-contact reversing contactor
ActiveCN102594226AIncrease computing speedImprove processing speedEmergency protective circuit arrangementsPolyphase induction motor starterMicrocontrollerEngineering
The invention discloses a non-contact reversing contactor, and belongs to the technical field of motor control. The non-contact reversing contactor comprises three phases of power supplies A1, B1 and C1 at an input end, three phases of power supplies A2, B2 and C2 at an output end, a positive thyristor group and a negative thyristor group, and is characterized by also comprising a singlechip unit and an interlocking module in (a) software or / and hardware form(s), wherein the singlechip unit controls the switching-on / off of the positive and negative thyristor groups through the interlocking module, and makes the positive and negative thyristor groups asynchronously in an on state. According to the non-contact reversing contactor, due to the adoption of the singlechip unit, control accuracy is improved; and the singlechip unit controls the switching-on / off of the positive and negative thyristor groups through the interlocking module, so that interlocked switching-on control over the positive and negative thyristor groups is realized, and a phase fault caused by the simultaneously switching-on of the positive and negative thyristor groups is avoided.
Owner:淄博延展电气科技有限公司
Multifrequency aliasing resisting high-precision synchronous measuring scale semiconductor laser ranging device and method
ActiveCN104049250AIncrease flexibilityOvercome the shortcomings of not being directly traceableUsing reradiationLaser rangingAnti-aliasing
The invention discloses a multifrequency aliasing resisting high-precision synchronous measuring scale semiconductor laser ranging device and method, and belongs to a phase laser ranging technology. The ranging device comprises a measuring scale generating unit, a laser frequency shifting unit, an anti-aliasing measuring light path and a phase measuring unit. The ranging method comprises the first step that a frequency standard laser and frequency-offset-lock semiconductor lasers are started, the second step that one beam is adopted as a reference laser beam, and the other beam is adopted as measuring lasers, the third step that c / |v2-v3| is adopted as an accurate measuring scale, the fourth step that c / |v1-v2| is adopted as a rough measuring scale, and the fifth step that a measuring angle cone prism is moved to a target end, the phase difference phi1 of the accurate measuring scale and the phase difference phi2 of the rough measuring scale are obtained respectively, and finally the measured distance value is obtained through the formula. The problem that an overlarge wave length and an over-small wave length cannot be generated synchronously and the laser measuring scales cannot directly trace to the source, and the problem of the nonlinear circular error and frequency aliasing are solved, and the multifrequency aliasing resisting high-precision synchronous measuring scale semiconductor laser ranging device and method have the advantages of being high in measuring efficiency, high in precision and high in stability and real-time performance.
Owner:HARBIN INST OF TECH
Isolating transformer
PendingCN108538556ASolve the problem of large common mode interferenceEliminate common mode interferenceUnwanted magnetic/electric effect reduction/preventionElectrical isolation testParasitic capacitance
The invention provides an isolating transformer, which comprises a magnetic core, at least two sets of transformer windings, at least one shielding layer, and a shielding layer potential lead, the shielding layer is located between the two sets of transformer windings, and the joint between the shielding layer and the shielding layer potential lead is located between both ends of the shielding layer. The invention not only can solve the problem of great common-mode interference existing in the isolating transformer, reducing the galvanic coupling generated by parasitic capacitance between thewindings, but also can reduce the influence of induced voltage at both ends of the shielding layer on the other windings, eliminating common-mode interference generated by the shielding layer, and thereby the requirement of high-speed, high-precision electric isolation testing and measurement systems is met.
Owner:BEIJING HUAFENG TEST & CONTROL TECH CO LTD
Differential charge amplifier with high precision, low temperature drift and low offset
InactiveCN104467717AHigh magnification accuracySmall temperature driftCharge amplifiersAmplifier modifications to reduce temperature/voltage variationCapacitanceAudio power amplifier
The invention provides a differential charge amplifier with high precision, low temperature drift and low offset, the differential charge amplifier has the advantages of high amplification precision on charge signals, small temperature drift and low offset voltage, and can be used for accurately amplifying vibration charge signals. The amplifier structurally comprises an overload protection circuit, a differential charge conversion circuit, a low-pass filter circuit and a high-pass filter circuit, which are connected in sequence, and a power supply conversion circuit used for supplying power to the circuits, wherein the differential charge conversion circuit comprises a first inverting amplifying circuit, a second inverting amplifying circuit and a subtraction operation circuit; a Qp anode and a cathode of a charge signal are respectively connected to the first inverting amplifying circuit and the second inverting amplifying circuit through capacitors, and the feedback resistance branches of the two inverting amplifying circuits respectively form T-shaped networks with the same RC series branch; the outputs of the first inverting amplifying circuit and the second inverting amplifying circuit serving as a positive phase input and a negative phase input are respectively connected to the subtraction operation circuit.
Owner:AVIC NO 631 RES INST
High-accuracy synchronous multi-measurement-ruler based semiconductor laser distance measurement device and method
ActiveCN104035087AIncrease flexibilityOvercome the shortcoming that the measuring ruler cannot be directly tracedUsing reradiationPhase differencePrism
The invention provides a high-accuracy synchronous multi-measurement-ruler based semiconductor laser distance measurement device and method and belongs to a phase laser distance measurement technology. The high-accuracy synchronous multi-measurement-ruler based semiconductor laser distance measurement device comprises a measuring ruler generation unit, a laser frequency shifting unit, a beam expanding collimation lens group and a light path and a circuit measurement unit. The high-accuracy synchronous multi-measurement-ruler based semiconductor laser distance measurement method comprises step 1, opening a frequency standard laser and a semiconductor laser; step 2, serving one beam as a reference laser beam and serving the other beam as a measurement laser beam; step 3, serving a formula as an accurate measurement ruler; step 4, serving a formula as a rough measurement ruler; step 5, moving a measurement prism to a target side to obtain the phase difference Phi 1 of the rough measurement ruler and the phase difference Phi 2 of the accurate measurement ruler and obtaining a measured distance value through a formula. According to the high-accuracy synchronous multi-measurement-ruler based semiconductor laser distance measurement device and method, the problem that the multi-measurement-ruler synchronicity and traceability of devices and methods cannot be integrated in the phase laser distance measurement technology is solved, the accuracy of distance measurement is high, the measurement efficiency is high, and the stability and the real-time performance are high.
Owner:HARBIN INST OF TECH
One-gun multi-beam welding control device and method of electron beam welding machine
ActiveCN103143829BFast adjustmentRealize high voltage insulation isolationElectron beam welding apparatusTransceiverLow voltage
The invention discloses a one-gun multi-beam welding control device and method of an electron beam welding machine. The device mainly comprises a central control unit, a deflection scanning driving power supply, a deflection scanning winding, an optical fiber driving power supply, optical fibers, an electron beam flow control unit, a first electron beam flow sampling resistor and a second electron beam flow sampling resistor. The one-gun multi-beam welding control device and method of the electron beam welding machine have the advantages that electron beam flow closed-loop control can be realized at a high-voltage end and the adjusting speed is fast; by using the optical fibers for transmitting signals, high-voltage insulation isolation is realized; by using two loops of analog optical fibers and transmitting signals through a differential mode, common-mode interference caused by change of transceiver device performance is eliminated; an electron beam flow is simultaneously sampled at a high-voltage end and a low-voltage end, and the nonlinearity of an electron beam flow control system and the drift of the working point of the electron beam flow control system are corrected by the central control unit; and excessive scanning traces left by electron beams when the electron beams move among different points in the one-gun multi-beam welding process are eliminated.
Owner:GUILIN THD TECH CO LTD
Capacitive touch white board
PendingCN110531900ASimple structureReasonable designInput/output processes for data processingWhiteboardCapacitance
The invention discloses a capacitive touch white board. The invention belongs to the technical field of touch whiteboards. The capacitive touch screen comprises a panel, a capacitive sensing layer anda supporting layer which are sequentially arranged, the capacitive sensing layer comprises a transmitting signal line and a receiving signal line which are perpendicular to each other. An intersection point of the transmitting signal line and the receiving signal line forms a micro capacitor, the transmitting signal line and the receiving signal line are both connected with the touch main board,the touch main board is used for positioning a touch position according to a capacitance change value of the micro capacitor, and the touch main board is connected with a host through an interface; the capacitive touch whiteboard is simple in structure, reasonable in design and convenient to operate, the functions of the whiteboard, the curtain and the touch control are integrated, the touch areaof the capacitive touch whiteboard covers the whole panel area, no blind area exists, overall uniform distribution is achieved, positioning accuracy is better facilitated, and practicability is high.
Owner:成都黝影科技有限公司
Mixed heterodyne multi-frequency anti-aliasing laser ranging device and method
ActiveCN104048642AOvercome the shortcomings of not being directly traceableIncrease flexibilityLaser detailsOptical rangefindersFrequency standardMeasuring ruler
The invention relates to a mixed heterodyne multi-frequency anti-aliasing laser ranging device and a mixed heterodyne multi-frequency anti-aliasing laser ranging method, belonging to a phase laser ranging technology. The ranging device comprises a measuring ruler generating unit, a laser frequency shifting unit, an anti-aliasing measuring light path and a phase measuring unit. The ranging method comprises the following steps: step one, starting a frequency standard laser, an offset frequency locking semiconductor laser and a He-Ne laser; step two, taking a beam as a reference laser beam, and the other beam as measuring laser; step three, taking c / |v2-v3| as accurate measuring ruler length; step four, taking c / |v1-v2| as rough measuring ruler length; and step 5, moving a measuring retroreflector to a target end to respectively obtain phase difference phi 1 and phi 2 of the accurate measuring ruler and the rough measuring ruler, and finally obtaining a measured distance value through a formula. The mixed heterodyne multi-frequency anti-aliasing laser ranging device and the method provided by the invention solve the problems that ultralong wavelength and ultrashort wavelength cannot be generated simultaneously, the laser measuring ruler cannot realize direct traceability, and nonlinear periodical error and frequency aliasing are caused, and has the characteristics of high measurement efficiency, high precision, and strong stability and real-time property.
Owner:HARBIN INST OF TECH
Multifrequency aliasing resisting high-precision synchronous measuring scale phase laser ranging device and method
ActiveCN104049249AOvercome the shortcomings of not being directly traceableIncrease flexibilityUsing reradiationAnti-aliasingPhase difference
The invention discloses a multifrequency aliasing resisting high-precision synchronous measuring scale phase laser ranging device and method, and belongs to a phase laser ranging technology. The ranging device comprises a measuring scale generating unit, a laser frequency shifting unit, an anti-aliasing measuring light path and a phase measuring unit. The ranging method comprises the first step that a frequency standard laser and frequency-offset-lock He-Ne lasers are started, the second step that one beam is adopted as a reference laser beam, and the other beam is adopted as measuring lasers, the third step that c / |v2-v3| is adopted as an accurate measuring scale, the fourth step that c / |v1-v2| is adopted as a rough measuring scale, and the fifth step that a measuring angle cone prism is moved to a target end, the phase difference phi1 of the accurate measuring scale and the phase difference phi2 of the rough measuring scale are obtained respectively, and finally the measured distance value is obtained through the formula. The problem that an overlength wave length and an ultrashort wave length cannot be generated synchronously and the laser measuring scales cannot directly trace to the source, and the problem of the nonlinear circular error and frequency aliasing are solved, and the multifrequency aliasing resisting high-precision synchronous measuring scale semiconductor laser ranging device and method have the advantages of being high in measuring efficiency, high in precision and high in stability and real-time performance.
Owner:HARBIN INST OF TECH
Optical aliasing resisting multifrequency laser ranging device and method
ActiveCN104049251AIncrease flexibilityOvercome the shortcomings of not being directly traceableUsing reradiationLaser rangingPhase difference
The invention discloses an optical aliasing resisting multifrequency laser ranging device and method, and belongs to a phase laser ranging technology. The ranging device comprises a measuring scale generating unit, a laser frequency shifting unit, a beam expanding collimating mirror set, a measuring light path and a circuit unit. The ranging method comprises the following steps that firstly, a frequency standard laser and He-Ne lasers are started; secondly, one beam is adopted as a reference laser beam, and the other beam is adopted as measuring lasers; thirdly, c / |v2-v3| is adopted as an accurate measuring scale; fourthly, c / |v1-v2| is adopted as a rough measuring scale; fifthly, a measuring angle cone prism is moved to a target end, the phase difference phi1 of the accurate measuring scale and the phase difference phi2 of the rough measuring scale are obtained respectively, and finally the measured distance value is obtained through the formula. The problem that an overlength wave length and an ultrashort wave length cannot be generated synchronously and the laser measuring scales cannot directly trace to the source, and the problem of the nonlinear circular error and frequency aliasing are solved, and the optical aliasing resisting multifrequency laser ranging device and method have the advantages of being high in measuring efficiency, high in precision and high in stability and real-time performance.
Owner:HARBIN INST OF TECH
Temperature detecting circuit and air conditioner
InactiveCN104596664AEliminate common mode interferenceSuppression of common mode interferenceSpace heating and ventilation safety systemsLighting and heating apparatusConstant current sourceElectrical and Electronics engineering
The invention discloses a temperature detecting circuit and an air conditioner. The temperature detecting circuit comprises a temperature sensor, a constant current source circuit which is connected with the temperature sensor to provide constant current power to the temperature sensor, an amplifying circuit which is connected with the output end of the constant current source circuit to amplify a signal output by the constant current source circuit and synchronously removing common doe interface at two ends of the temperature sensor, and a filter circuit which is connected with the amplifying circuit. With the adoption of the temperature detecting circuit, the problem that the inaccurate temperature detected by the temperature detecting circuit in the prior art can be solved, and the effect of improving the accuracy of temperature detected by the temperature detection circuit can be achieved.
Owner:GREE ELECTRIC APPLIANCES INC
Test system and test method for accurately testing IC reference voltage
PendingCN106501577ALower height requirementEliminate common mode interferenceVoltage measurements onlySignal processing circuitsZener diode
The invention relates to a test system and a test method for accurately testing the IC reference voltage. The test system comprises an IC device, a structurally-symmetrical signal processing circuit, and a V / I test source. The signal input end of the signal processing circuit is connected with the reference voltage test terminal of the IC device, and the signal output end of the signal processing circuit is connected with the V / I test source. According to the test method, the signal processing circuit buffers and amplifies an input voltage Vin and the voltage Vz of a Zener diode, compares Vin with Vz, and outputs a voltage Vout to the V / I test source after differential amplification of a signal after comparison. The common-mode interference of a test equipment ground line and space noise can be eliminated, the influence of test error on the test system can be reduced, and a higher-accuracy test result can be obtained.
Owner:SHAOXING SILICORE TECH
High-precision synchronous mixed heterodyne-mode phase laser range finding device and method
ActiveCN104155643AIncrease flexibilityOvercome the shortcoming that the measuring ruler cannot be directly tracedUsing reradiationFrequency stabilizationPhase difference
A high-precision synchronous mixed heterodyne-mode phase laser range finding device and method belongs to the phase laser range finding technology. The range finding device comprises a measurement ruler generation unit, a laser frequency shift unit, a beam expanding collimating mirror set, and a measurement light path and circuit unit. The range finding method comprises a step 1 of starting a frequency reference laser and a double longitudinal mode frequency stabilization He-Ne laser, a step 2 of taking one beam as a reference laser beam, and another beam as a measurement beam, a step 3 of taking a formula defined in the specification as an accurate measurement ruler, a step 4 of taking a formula defined in the specification as a rough measurement ruler, and a step 5 of moving a measurement cube-corner prism to a target end for obtaining phase differences of the accurate measurement ruler and the rough measurement ruler Phi 1 and Phi 2 respectively and obtaining a to-be-tested distance value through a formula. The invention solves a problem that a device and method for achieving synchronism of multiple measurement rulers and traceability is not available in the phase laser range finding technology, and the device and method provided by the invention is characterized by being high in range finding precision and measurement efficiency, and good in stability and real-time performance.
Owner:HARBIN INST OF TECH
Ceramic adapter plate for improving temperature characteristics of differential silicon vibration beam accelerometer
InactiveCN110531101AEliminate adhesionKeep shapeTelevision system detailsPiezoelectric/electrostriction/magnetostriction machinesElectrical junctionAccelerometer
The invention discloses a ceramic adapter plate for improving temperature characteristics of a differential silicon vibration beam accelerometer. The adapter plate comprises an adapter plate body; anda cross-shaped through hole is formed in the middle of the adapter plate body. Four metal right-angle frame lines are printed on the surface of the adapter plate body; and the four metal right-angleframe lines and the edge of the cross-shaped through hole form four rectangular bonding faces jointly and the whole structure is in central symmetry. According to the invention, the ceramic adapter plate has the following advantages: the adverse effect of the fluidity of an adhesive on the shape of the contact part of an adhesive layer and a chip is eliminated; the symmetry of the overall structure of the differential silicon vibration beam accelerometer after four points are coated with adhesives is improved; and the accelerometer gives full play to the inhibition effect on the common-mode interference caused by thermal stress, so that the temperature performance of the accelerometer is improved.
Owner:SOUTHEAST UNIV
Tissue component noninvasive detection method, device and system and wearable equipment
ActiveCN113303792AAccurately determineLower requirementDiagnostics using spectroscopyScattering properties measurementsMedicineFirst light
The embodiment of the invention discloses a tissue component noninvasive detection method, device and system and wearable equipment, and the method comprises the steps: obtaining a first light intensity value of each preset wavelength under each source detection distance for a detected part of a detected object; according to the absolute value of the light intensity variable quantity, determining a first light intensity measurement value and / or a first light intensity reference value from all first light intensity values corresponding to the preset wavelength, taking a source detection distance corresponding to the first light intensity measurement value as a measurement distance, and taking a source detection distance corresponding to the first light intensity reference value as a reference distance, wherein the first light intensity measurement value is a first light intensity value with the maximum absolute value of the light intensity variation, and the first light intensity reference value is a first light intensity value with the minimum absolute value of the light intensity variation. According to the embodiment of the invention, the measurement distance and the reference distance are accurately determined. On the basis, a basis is provided for the component concentration of the to-be-detected tissue by accurately determining the measurement distance and / or the reference distance, so that the detection precision is improved.
Owner:SUNRISE TECH
Multifunctional cable identifier
InactiveCN109164349ARealize data communicationImprove communication distanceFault location by conductor typesCarrier signalElectromagnetic interference
The invention relates to a multifunctional cable identifier, which comprises a shell. A circuit board is arranged in the shell; a test line and a power line are led out from the shell; the circuit board is provided with a main processor, a power conversion unit, a display unit, an extension unit, a carrier wave unit, a waveform generation unit, a coupling unit and an output unit; the coupling unitis connected with the output unit; the waveform generation unit is respectively connected with the main processor and the coupling unit; the carrier wave unit is respectively connected with the mainprocessor and the coupling unit; the power conversion unit is connected with the main processor; the display unit is connected with the main processor; and the extension unit is connected with the main processor. The multifunctional cable identifier in the invention can eliminate electromagnetic interference generated by the own circuit board; the interference of a common high-voltage common-ground common cable trench can be effectively overcome from an electromagnetic interference source and a propagation path; and the multifunctional cable identifier has the advantages of being simple in structure, accurate in judgment, convenient to use, high in recognition speed and the like.
Owner:PANJIN POWER SUPPLY COMPANY OF STATE GRID LIAONING ELECTRIC POWER SUPPLY +1
Hybrid laser ranging device and method based on traceable simultaneous multiple measurement tapes
InactiveCN105318839AIncrease flexibilityOvercome the shortcomings of not being directly traceableUsing optical meansLaser rangingPhase difference
The invention provides a hybrid laser ranging device and method based on traceable simultaneous multiple measurement tapes, belonging to the technology of phase laser ranging. The ranging device comprises a measuring tape generation unit, a laser frequency shift unit, an expanded beam collimation lens group, a measuring light path and a circuit unit. The ranging method comprises the following steps of (1) starting a reference frequency lasers and a semiconductor laser, (2) taking one beam as a reference laser beam, and taking the other beam as measurement laser, (3) taking c / |v2-v3| as a fine measurement tape, (4) taking c / |v1-v2| as a crude measurement tape, (5) moving a measurement retroreflector to a target end, obtaining the phase differences phi 1 and phi2 of the crude measurement tape and the fine measurement tape respectively, and finally obtaining a measured distance value through a formula. According to the device and the method, the problem that a device and a method with the consideration of synchronization and traceability of multiple measurement tapes are lacked in the phase laser ranging technology is solved, and the device and the method have the characteristics of high ranging precision, high measurement efficiency, high stability and high real-time performance.
Owner:HARBIN INST OF TECH
USB interface circuit and electronic device using same
PendingCN111782564AEliminate common mode interferenceEfficient identificationElectric digital data processingElectrical connectionHemt circuits
The invention provides an electronic device. The electronic device comprises a USB interface circuit and a main control chip, and the USB interface circuit is connected with the main control chip andis used for realizing communication connection between the main control chip and a USB device. The USB interface circuit further comprises a USB interface, a switching driver and a filter circuit. TheUSB interface is used for being connected with the USB device in an inserted mode so as to establish electrical connection, wherein the switching driver is electrically connected between the USB interface and the main control chip, and the switching driver drives signals transmitted between the USB device and the main control chip according to a preset coefficient; the filter circuit is electrically connected between the USB interface and the switching driver, and the filter circuit is used for filtering common-mode interference between the USB interface and the switching driver. Therefore, the plugged USB device can be effectively identified.
Owner:HONG FU JIN PRECISION IND WUHAN CO LTD +1
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