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61results about How to "Improve response bandwidth" patented technology
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Dynamic load fixture for rotary mechanical systems
ActiveUS7080565B2Affect accuracyMaintain accuracyMachine part testingWork measurementDrive shaftAngular rotation
A dynamic load fixture (DLF) for testing a unit under test (UUT) includes a lateral load system that applies a time-varying lateral load profile to the UUT drive shaft and an encoder that measures its angular rotation. An isolation stage suitably constrains the encoder from rotating about the axis while allowing it to move in other directions in which the application of the lateral force induces motion. The lateral load system includes a load bearing around the drive shaft, an actuator that applies a lateral force to the load bearing, a force sensor for measuring the applied lateral force, and a lateral controller for adjusting a command signal to the actuator to implement a lateral load profile. The DLF may also include a torsion load system that applies a time-varying torsion load profile to the drive shaft.
Owner:RAYTHEON CO
High-precision fiber frequency transmission system
ActiveCN106877930AImprove response bandwidthImprove stabilityFibre transmissionDiscriminatorInjection locked
The invention discloses a high-precision fiber frequency transmission system, and the system comprises a PID circuit board, a phase discriminator, a photoelectric detector, a Faraday rotary reflector, a microwave photon phase shifter, a 2*2 optical coupler, a circulator, a slave laser, a frequency reference signal source, a main laser emitter, an isolator, an optical fiber link, and a time frequency receiving and transmitting module. On the basis of a single-fiber bidirectional return error signal obtaining mode, the system carries out the optical fiber link noise compensation based on injection locked coherent detection and the microwave photon phase shifter, thereby achieving the high-precision fiber frequency transmission. The system can achieve the high-precision recovery of a frequency reference signal of a local end at a far end. The system can achieve the two features, needed by phase change, on the same microwave photon phase shifter at the same time: large-bandwidth response and large dynamic range, facilitates the reduction of the complexity, and improves the stability and adaptability. The system can be used in the fields of comparison of the optical clock / atomic clock and the frequency transmission.
Owner:SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
Dynamic load fixture for application of torsion loads for rotary mechanical systems
ActiveUS20060070457A1Effectively reproduceHigh response bandwidthMachine part testingWork measurementElectric machineryState-space representation
A dynamic load fixture (DLF) applies a torsion load to a unit under test (UUT) to achieve the demanding aerodynamic load exposures encountered by a control actuation system (CAS) in flight. Instead of fixing the end of the torsion bar, the DLF controls the application of torque to the torsion bar, hence the UUT via a DLF motor. The dynamic load can be independent of the angular rotation of the UUT, which allows the DLF to more effectively reproduce desired acceptance tests such as torque-at-rate and nonlinear loads. Furthermore, application of the loads through a torsion bar allows the system the compliance needed to generate precise loads while allowing for the flexibility of changing torsion bars to test a wide variety of UUT on one test platform. To achieve the demanding aerodynamic load exposures encountered by a CAS in flight, the controller must be able to respond both very fast and very precisely. Control is enhanced by the thorough characterization of the DLF and application of either “classic” negative feedback control or “modern” state-space control methods of linear observers and quadratic optimum control.
Owner:RAYTHEON CO
Dynamic load fixture for application of torsion loads for rotary mechanical systems
ActiveUS7165465B2Efficient reproductionImprove response bandwidthMachine part testingWork measurementNegative feedbackAerodynamic load
A dynamic load fixture (DLF) applies a torsion load to a unit under test (UUT) to achieve the demanding aerodynamic load exposures encountered by a control actuation system (CAS) in flight. Instead of fixing the end of the torsion bar, the DLF controls the application of torque to the torsion bar, hence the UUT via a DLF motor. The dynamic load can be independent of the angular rotation of the UUT, which allows the DLF to more effectively reproduce desired acceptance tests such as torque-at-rate and nonlinear loads. Furthermore, application of the loads through a torsion bar allows the system the compliance needed to generate precise loads while allowing for the flexibility of changing torsion bars to test a wide variety of UUT on one test platform. To achieve the demanding aerodynamic load exposures encountered by a CAS in flight, the controller must be able to respond both very fast and very precisely. Control is enhanced by the thorough characterization of the DLF and application of either “classic” negative feedback control or “modern” state-space control methods of linear observers and quadratic optimum control.
Owner:RAYTHEON CO
Integrated active-passive compliant one-dimensional variable force grinding and polishing device and control method
ActiveCN108044463ARealize variable force flexible contactAvoid shockBelt grinding machinesAutomatic grinding controlLinear motionManufacturing technology
The invention belongs to the technical field of intelligent processing and manufacturing, and particularly discloses an integrated active-passive compliant one-dimensional variable force grinding andpolishing device and a control method. The integrated active-passive compliant one-dimensional variable force grinding and polishing device comprises a linear module servo motion platform, a mountingflange, a limiting plate, a position and orientation sensor, a speed-adjustable compliant grinding and polishing mechanism and a controller, and the linear module servo motion platform is used for driving the grinding and polishing mechanism to perform linear motion; the mounting flange and the limiting plate are mounted on a base of the linear module servo motion platform, and the position and orientation sensor and the speed-adjustable compliant grinding and polishing mechanism are installed on the limiting plate; and the position and orientation sensor is used for measuring position and orientation of the one-dimensional variable force grinding and polishing device and sending the position and orientation to the controller, a force sensor is arranged between the compliant grinding and polishing mechanism and sliding blocks, the force sensor is used for collecting a contact force signal and send to the controller which can calculate speed control quantity, and the speed-adjustable compliant grinding and polishing mechanism is driven to move by rotation of a servo motor according to the speed control quantity. According to the integrated active-passive compliant one-dimensional variable force grinding and polishing device and the control method, the contact status of a abrasive belt and a workpiece can be adjusted in real time, and a stable and compliant grinding and polishingprocess is realized.
Owner:HUAZHONG UNIV OF SCI & TECH
Dynamic load fixture for rotary mechanical systems
ActiveUS20060070461A1Efficient reproductionImprove response bandwidthMachine part testingWork measurementDrive shaftAngular rotation
A dynamic load fixture (DLF) for testing a unit under test (UUT) includes a lateral load system that applies a time-varying lateral load profile to the UUT drive shaft and an encoder that measures its angular rotation. An isolation stage suitably constrains the encoder from rotating about the axis while allowing it to move in other directions in which the application of the lateral force induces motion. The lateral load system includes a load bearing around the drive shaft, an actuator that applies a lateral force to the load bearing, a force sensor for measuring the applied lateral force, and a lateral controller for adjusting a command signal to the actuator to implement a lateral load profile. The DLF may also include a torsion load system that applies a time-varying torsion load profile to the drive shaft.
Owner:RAYTHEON CO
High-power ultrashort-pulse optical frequency comb generation method based on self-similar amplifier
ActiveCN105428987ARealizing Optical Frequency CombsNarrow widthLaser detailsBandwidth limitationCarrier signal
The invention discloses a high-power ultrashort-pulse optical frequency comb generation method based on a self-similar amplifier. The high-power ultrashort-pulse optical frequency comb generation method is based on self-similar amplification technology and effectively overcomes gain narrowing, bandwidth limitation and nonlinear phase distortion in pulse amplification. A light spectrum is effectively expanded, and the bandwidth of an output pulse is reduced. Furthermore the power of a mode-locked pulse is effectively expanded, thereby acquiring a high-power femtosecond pulse and improving carrier envelope phase zero-frequency locking precision. Furthermore carrier envelope phase zero-frequency locking technology based on an acoustic-optical crystal frequency shifter is utilized, thereby realizing large reaction bandwidth and high control precision, and realizing a high-frequency high-power ultrashort-pulse optical frequency comb through real-time control. The high-power ultrashort-pulse optical frequency comb generation method is advantageous in that the high-power ultrashort-pulse optical frequency comb generation method can be directly expanded and applied on femtosecond optical frequency comb control technology for obtaining the stable high-frequency high-power ultrashort-pulse optical frequency comb.
Owner:CHONGQING HUAPU INFORMATION TECH CO LTD
Distributed fibre sensing system and vibration detection and positioning method therefor
ActiveUS20200182685A1Improve spatial resolutionLong detection distanceSubsonic/sonic/ultrasonic wave measurementUsing wave/particle radiation meansOptical circulatorEngineering
A distributed fibre sensing system and a vibration detection and positioning method therefor are disclosed. The system comprises: a signal generating module, a light source module, an optical frequency comb generating module, a frequency sweeping and pulse generating module, an optical circulator, a sensing fibre, an interference module, a photoelectric conversion module and a detection and position module. The method comprises: obtaining a plurality of Rayleigh backscattering signals of the sensing fibre; performing a fading elimination processing on the Rayleigh backscattering signals, thereby obtaining a plurality of averaged Rayleigh backscattering signals of non-interference fading and polarization fading; performing a phase processing on the averaged Rayleigh backscattering signals, thereby obtaining phase variance curves; and determining a vibration point according to variances in the phase variance curves, and finally obtaining a position and a vibration waveform of the vibration point.
Owner:SHANGHAI JIAO TONG UNIV +1
Double-motor device on horizontal shaft of photoelectric tracking system and tracking and controlling method under synchronous driving
InactiveCN102882447AReduce volumeIncrease stiffnessMultiple motor speed/torque controlLoop controlElectric machine
The invention discloses a double-motor device on a horizontal shaft of a photoelectric tracking system and a tracking and controlling method under synchronous driving. The double-motor device comprises direct-current torque motors, a power driving module, a tachometer, a position coder, a horizontal shaft load and a control processor; one of the direct-current torque motors and the tachometer are arranged on one side of the horizontal shaft; the other of the direct-current torque motors and the position coder are arranged on the other side of the horizontal shaft; the horizontal shaft load is arranged in the middle of the horizontal shaft; and the control processor outputs control quantity to the power driving module so as to drive the two motors on the horizontal shaft to operate and work together. According to the invention, the two direct-current torque motors in the same specification can be stably tracked and controlled under the coaxial and synchronous driving, the size of a frame can be reduced under the same load condition, and a larger load output torque can be achieved without reducing the maximum no-load speed; and due to the balanced torque outputs at the two ends of the horizontal shaft, the rigidity of the whole horizontal shaft system is strengthened, so that the closed-loop control bandwidth of the system can be increased.
Owner:INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
Follow-up control method by means of fractional-order quick terminal sliding mode control
InactiveCN107577149AImprove response bandwidthEliminate chatterAdaptive controlTerminal sliding modeShaft voltage
The invention provides a follow-up control method by means of fractional-order quick terminal sliding mode control. The follow-up control method includes receiving angle instructions, extracting follow-up angle feedback, computing first-order derivatives, second-order derivatives and third-order derivatives of the instructions and computing first-order derivatives and second order-derivatives of the angle feedback; computing angle control errors and first-order derivatives and second-order derivatives of the angle control errors; computing first-order derivatives of fractional-order quick terminal sliding mode surfaces and non-singular quick terminal sliding mode surfaces of position loops; computing fractional-order terminal sliding mode control quantities and current loop instructions offollow-up systems; acquiring line currents, computing alternating and direct shaft currents of PMSM (permanent magnet synchronous motors) in dq coordinates and inputting dq shaft voltage control quantities for inverse park transformation on the PMSM to control the motors. The follow-up control method has the advantages that the systems are excellent in dynamic response capacity, and static positioning and dynamic tracking precision requirements can be met.
Owner:西北机电工程研究所
Miniature diaphragm type optical fiber end FP pressure sensor, manufacturing method and application
ActiveCN110487454AHigh sensitivity and response bandwidthIncrease the scope of applicationFluid pressure measurement by electric/magnetic elementsForce measurement by measuring optical property variationCorrosionQuartz
The invention provides a miniature diaphragm type optical fiber end FP pressure sensor, a manufacturing method and application. The miniature diaphragm type optical fiber end FP pressure sensor includes an optical fiber, a hollow core optical fiber and a pressure-sensitive diaphragm, wherein the optical fiber and the hollow core optical fiber have the same diameters and the two are welded by arcs;and the pressure-sensitive diaphragm is bonded on the end surface of the hollow core optical fiber by using a hydrogen-oxygen catalytic bonding method. The entire quartz structure of the sensor can be realized, the existence of organic polymers at the joints of the elements is eliminated, and long-term stability and thermal stability are extremely high. The manufacturing method improves the applicable range and the service life of the sensor and the manufacturing cost is also reduced. The sensor provided in the invention can be applied to monitoring of parameters such as pressure and sound waves in extreme environments such as high temperature, high pressure, and strong corrosion, and can also be used for pressure measurement in the case of limited human body space in the medical and clinical field.
Owner:DALIAN UNIV OF TECH
Drive control system and method for control moment gyro outer frame
ActiveCN109502055AHigh control precisionImprove reliabilityCosmonautic vehiclesSpacecraft guiding apparatusPhase currentsControl system
The invention relates to a drive control system and method for a control moment gyro outer frame. The drive control system comprises a position detection module used for detecting the position information of the control moment gyro outer frame; a current detection module used for detecting two-phase current information of a control moment gyro outer frame motor; a position control module used forreceiving a position control signal and outputting a speed control signal according to the position information detected by the position detection module; a speed control module used for receiving a speed control signal and outputting a current control signal according to the position information detected by the position detection module; and a current control module used for receiving a current control signal and carrying out drive control on the control moment gyro outer frame according to the two-phase current information detected by the current detection module and the position informationdetected by the position detection module. The control system and the control method not only improve the accuracy of the system, but also greatly improve the reliability and response width of the system.
Owner:SHANGHAI AEROSPACE CONTROL TECH INST
Dual-motor synchronous control device and method
PendingCN111464073AHigh precision of synchronous controlImprove your own precisionAC motor controlElectric motor controlSynchronous controlControl system
The embodiment of the invention discloses a dual-motor synchronous control device and method, relates to the technical field of electromechanical control, and can improve dual-motor synchronous control precision and reduce the response period of a speed loop and a current loop of a master-slave motor servo system. The method is characterized in that an embedded controller, an FPGA controller, a master motor driving circuit, a slave motor driving circuit, a master motor, a slave motor, a master motor sensor and a slave motor sensor are included, wherein the embedded controller is connected withthe FPGA controller through a bus, the FPGA controller is connected with the master motor driving circuit and the slave motor driving circuit, the master motor is connected with the master motor driving circuit, the master motor sensor is connected with the master motor, the slave motor is connected with the slave motor driving circuit, and the slave motor sensor is connected with the slave motor. The method is advantaged in that the method is suitable for a dual-motor synchronous control system.
Owner:NANJING INST OF TECH
Polarization unrelated high speed photo switch
InactiveCN1624510ASimple structureQuick responseCoupling light guidesElectromagnetic transmissionEngineeringRapid response
A high speed optical switch into relating polarization is disclosed whose characteristics is its structure: the driving device includes by circular mirror comprising of the third terminal port and the forth terminal port on one side of a coupler connecting together and a controlling device being put into the circular mirror ; the first terminal port of the is connecting to the second terminal port of three terminal ports circulator whose first terminal port is input terminal and the third terminal port is the first output terminal of the switch, the second terminal port is the second output terminal; the coupler circulator and circular mirror are all fixed on one. The advantages are rapid response speed, unconcerned to polarization and broad band response, simple structure, reliable and stable operation.
Owner:SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
LED visible light communication system based on OFDM
InactiveCN105071856AImprove response bandwidthIncrease transfer rateClose-range type systemsMulti-frequency code systemsDistortionAnti jamming
An LED visible light communication system based on OFDM relates to a visible light communication technology. The LED visible light communication system of the invention is used for solving the problem that transmission speed rate is low and the anti-jamming capability is weak because the visible light communication system is simple in design. A pre-equalizing circuit is used for compensating distortion brought by a system via a device and a channel so as to extend a response bandwidth of an LED array, and an OFDM modulator circuit takes full advantage of existing bandwidth to improve transmission rate. A photoelectric module is used for converting the received optical signal into an electric signal; a signal processing circuit is used for obtaining an obvious characteristic signal after processing the input electric signal. A communication protocol is used for solving the problems of a transmitting and receiving acknowledgement mechanism, a message read-write mechanism, a time sequence matching mechanism. By using an OFDM modulation technique as basis, and using DSP digital information processing technique as core, the LED visible light communication system of the invention improves the transmission speed rate. The pre-equalizing circuit and a post-equalizing circuit improve the anti-jamming capability of the system. The LED visible light communication system of the invention could be applied to visible light communication of an LED.
Owner:HARBIN UNIV OF SCI & TECH
Device and method of evaluating time domain stability of high-power optical fiber laser system
PendingCN108692918AAvoiding Bandwidth-Limited InsufficienciesImprove response bandwidthOptical apparatus testingBandpass filteringAnalysis center
The invention provides a device and a method of evaluating time domain stability of a high-power optical fiber laser system. The device comprises a to-be-detected high-power optical fiber laser system, a wavelength-tunable ultralow noise optical fiber laser, a wavelength division multiplexer, an energy transfer optical fiber, a collimator, a bandpass filter, a power meter and a waste light collector. Through analyzing the dependency relationship between the conversion efficiency of Raman amplification laser with the central wavelength of lambda2 and the time domain stability of pumping laser with the central wavelength of lambda1 and through measuring the output power of Raman amplification signal light, the Raman conversion efficiency is further calculated and then compared with the Ramanamplification light power and the conversion efficiency which are calculated and obtained in a no-time domain undulation ideal condition, and thus, the time domain stability of the to-be-detected high-power optical fiber laser system can be evaluated. The time domain stability of the high-power optical fiber laser system can be evaluated based on a pure optical detection method, and problems suchas limited bandwidth and high system cost existing in the traditional photoelectric detection method can be avoided.
Owner:NAT UNIV OF DEFENSE TECH
Uni-traveling-carrier photodetector structure and manufacturing method thereof
ActiveCN106784132ALower junction capacitanceHigh bandwidthFinal product manufactureSemiconductor devicesCapacitancePhotodetector
The invention provides a uni-traveling-carrier photodetector structure and a manufacturing method thereof. A photodetector structure with a collection layer area smaller than an absorption layer area is manufactured by utilizing a stepwise corrosion method, so that device capacitance is greatly reduced, the RC response bandwidth of a device is increased under the condition of the same absorption layer thickness, and the total bandwidth of the device is increased; the device has a larger absorption layer area under the condition of the same absorption layer area and the same absorption layer thickness (the RC bandwidth and the transition bandwidth are same), so that the device has a higher response degree and can work under higher incident power, and the performance improvement is more remarkable in high-speed high-power application; and therefore, the photodetector structure is suitable for the fields of terahertz signal generation, light receiving in high-speed light communication, and the like.
Owner:SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
Bragg grating, preparation method thereof and distributed feedback laser
ActiveCN111769437APrevent injectionLow refractive indexOptical wave guidanceLaser optical resonator constructionDistributed feedback laserGrating
The invention provides a Bragg grating, a preparation method thereof and a distributed feedback laser, and belongs to the technical field of semiconductor lasers. The Bragg grating is arranged in a distributed feedback laser. The Bragg grating comprises a lower grating waveguide layer, a middle grating waveguide layer and an upper grating waveguide layer which are sequentially formed and have different refractive indexes; the refractive index of the middle grating waveguide layer is lower than the refractive index of the lower grating waveguide layer and the refractive index of the upper grating waveguide layer; the doping types of the lower grating waveguide layer and the middle grating waveguide layer are the same; the doping type of the upper grating waveguide layer is opposite to the doping types of the adjacent layers, so that a reverse biased PN junction can be formed on the upper grating waveguide layer; a plurality of grooves are formed in the upper grating waveguide layer at intervals in the cavity length direction of the distributed feedback laser; and the grooves are filled with buried layers to flatten the upper grating waveguide layer. The coupling coefficient of the Bragg grating can be increased along with the increase of the current of the distributed feedback laser, so that the cavity loss of the distributed feedback laser is reduced, and the response bandwidthis expanded.
Owner:XIAMEN SANAN INTEGRATED CIRCUIT
Four-quadrant detector signal amplifying circuit for laser radar
PendingCN109031245ASimple structureImprove response bandwidthWave based measurement systemsAmplifier combinationsFour quadrantsPower flow
The invention discloses a four-quadrant detector signal amplifying circuit for a laser radar. The circuit comprises a four-quadrant detector, wherein current signals output after the four-quadrant ofthe four-quadrant detector performs photoelectric conversion are respectively sent to a first-stage amplifying circuit, the first-stage amplifying circuit converts the current signals into voltage signals and performs signal amplification, and the output signal of the first-stage amplifying circuit is sent to a second-stage amplifying circuit for amplification. The four-quadrant detector signal amplifying circuit for a laser radar sets the feedback resistance value of the first-stage amplifying circuit to a specific range to effectively improve the response bandwidth, so that the output voltage of the first-stage amplifying circuit can be used for subsequent processing when the output of the two-stage amplifying circuit is detected to be saturated in close range, thereby ensuring the detection accuracy, and improving the detection dynamic range. And the amplification factor of the second-stage amplifying circuit is taken to be not less than 500, and the total amplification factor of the entire four-quadrant detector signal amplifying circuit is FORMULA, thereby increasing the gain, increasing the radar detectable distance, and improving the detection precision.
Owner:CHENGDU GUORONG TECH
High-performance distributed optical fiber sensing system and method
PendingCN112762970AFlexible control of frequency sweep cycleHigh repetition rateConverting sensor output opticallyContinuous lightRayleigh scattering
The invention discloses a high-performance distributed optical fiber sensing system and method. The system comprises a multi-wavelength narrow linewidth light source, a modulation unit, a splitter, a wavelength division multiplexer, a wavelength division demultiplexer, a circulator, a sensing optical fiber, a demodulation module and an upper computer. The continuous light emitted by the multi-wavelength narrow-linewidth laser is modulated by using the sweep-frequency filter or the multi-path signal generator, asynchronous modulation among wavelengths is realized by controlling the sweep-frequency rate of the sweep-frequency filter or the multi-path signal generator to trigger the modulator in a parallel time delay manner, and the pulse interval, the pulse width and the pulse repetition frequency are flexible and adjustable. And the demultiplexer and the wavelength division multiplexer are utilized to realize multi-channel synchronous sensing, so that the measurement efficiency is improved. Pulse light with multiple wavelengths is used as detection light to enter a sensing optical fiber, information carried by Rayleigh scattering signals under each wavelength is demodulated, and the signals are comprehensively processed. According to the invention, system complexity is reduced, and system performance is improved.
Owner:冉曾令
Full-digital rigid-flexible coupling precise force controlled grinding and polishing device and control method
ActiveCN109623590AImprove grinding and polishing precisionAvoid excessive grinding and force overshootBelt grinding machinesGrinding feed controlSelf adaptiveEngineering
The invention belongs to the field of grinding and polishing force control, and discloses a full-digital rigid-flexible coupling precise force controlled grinding and polishing device. The grinding and polishing device comprises a speed-variable flexible grinding and polishing mechanism, a one-dimensional linear module force control servo motion platform and a connecting device used for connectingthe speed-variable flexible grinding and polishing mechanism with the one-dimensional linear module force control servo motion platform. The one-dimensional linear module force control servo motion platform comprises a linear servo module motor, a ball screw, a linear module sliding block, a linear module base, and a controller. The invention further discloses a control method of the device. According to the full-digital rigid-flexible coupling precise force controlled grinding and polishing device, a one-dimensional force sensor collects a contact force signal of the speed-variable flexiblegrinding and polishing mechanism and a to-be-ground and polished workpiece and controls the servo motor to accurately move by the controller, so that the contact state between the speed-variable flexible grinding and polishing mechanism and the to-be-ground and polished workpiece is changed in real time, and the speed-variable flexible grinding and polishing mechanism and the to-be-ground and polished workpiece are maintained to be in flexible contact with self-adaptive variable force.
Owner:HUAZHONG UNIV OF SCI & TECH
Optical waveguide detector capable of eliminating parasitic capacitance
InactiveCN105206686AImprove response bandwidthImprove conductivitySemiconductor devicesParasitic capacitanceElectrode Contact
The invention discloses an optical waveguide detector capable of eliminating parasitic capacitance. The optical waveguide detector includes a waveguide layer 2, an insulating layer 2 and an n electrode; the waveguide layer 2 is a rectangular body of which the middle is hollowed out; one edge of the waveguide layer 2 contacts with a waveguide layer 1 and an insulating layer 1; the insulating layer 2 is a rectangular body of which the middle is hollowed out; the bottom of the insulating layer 2 contacts with the waveguide layer 2; the four walls of the insulating layer 2 contacts with the inner walls of the waveguide layer 2; the n electrode is arranged at the center of the insulating layer 2; and the bottom of the n electrode contacts with the waveguide layer 2. According to the optical waveguide detector of the invention, the n electrode is shifted to behind at rear flat stage, and the n electrode does not contact with a substrate any more, and at the same time, the substrate does not need heavy doping for improving conductivity, and therefore, parasitic capacitance is no longer generated between a p electrode and the substrate, and total capacitance can be reduced, and thus, the response bandwidth of the optical waveguide detector can be improved.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
A comprehensive active and passive flexible one-dimensional variable force grinding and polishing device and control method
ActiveCN108044463BRealize variable force flexible contactReduce processing deformationBelt grinding machinesAutomatic grinding controlLinear motionManufacturing technology
Owner:HUAZHONG UNIV OF SCI & TECH
Geophone with magnetic-liquid sealed gas spring
A geophone with a magnetic-liquid sealed gas spring consists of external binding posts, an upper cover, an upper sealing ring, a casing, a movable ring frame, a coil, a permanent magnet, a lower magnetic shoe, lower magnetic liquid, the gas spring, a lower cover, a lower sealing ring, a lower framework cover, an upper magnetic shoe, upper magnetic liquid, an inner binding post, a transverse soft connecting spring, an upper framework cover, inner upper binding posts and upper soft connecting springs. The casing, the lower cover and the upper cover are integrally packaged via the upper sealing ring and the lower sealing ring, the movable ring framework, the upper framework and the lower framework are integrally packaged between the casing and the magnetic shoes of the magnet to form a framework combination, a certain gap is formed between the framework combination and the upper cover and the lower cover as well as between the magnetic shoes and is sealed by the magnetic liquid, and the gas spring formed by nitrogen gas is sealed in the gap. Compared with other geophones, the geophone adopts the gas spring sealed by the magnetic liquid to support a movable ring of a detector, and accordingly, elastic coefficient of the detector increases along with increase of displacement, and purposes of the high-performance detector are achieved.
Owner:浩华科技实业有限公司
Shielding casing for moving iron unit and assisted listening equipment using shielding casing
InactiveCN103079159AHigh electromagnetic shieldingSound quality unchangedDeaf-aid setsShielding gasSound quality
The invention relates to a shielding casing for a moving iron unit and assisted listening equipment using the shielding casing. The shielding casing for the moving iron unit comprises a casing body and a base, wherein a speaking terminal is arranged at the top of the casing body; the speaking terminal extends outwards to form a sounding tube; and the casing body is connected with the base. Compared with the prior art, the shielding casing disclosed by the invention has the characteristics that the casing body is formed by integrally stretching, so that the electromagnetic shielding performance of the casing body is greatly improved; no secondary processing is needed; and under the condition that the sound quality is kept unchanged, the manufacturing process is simple, the work strength is reduced, the production efficiency is increased and the production cost is reduced; magnetic mechanisms at the upper end and the lower end of an armature drive the armature to vertically vibrate; a vibrating diaphragm is driven by a vibration conducting rod to vibrate and sound from the sounding tube; the shielding casing can be directly arranged in ears and is simple and reasonable in structure, favorable in sounding effect and convenient in use; and the vibrating diaphragm is close to the speaking terminal and is positioned above the vibrating device and can be used for transmitting the vibration from the sounding tube through the speaking terminal so as to effectively ensure sounding quality.
Owner:SUZHOU HEARONIC ELECTRONICS
Screening can and telephone receiver thereof
ActiveCN103096701AReduce volumeSuppress high frequency outputMagnetic/electric field screeningEarpiece/earphone attachmentsVoice frequencyLow frequency
The invention relates to a screening can and a telephone receiver of the screening can. The screening can comprises a bottom box and a box cover, wherein the box cover is arranged on the top of the bottom box, a step is arranged inside the bottom box and divide the bottom box into a bottom box front cavity and a bottom box rear cavity, and the step forms an angle A with the panel. According to the screening can, the step is aslant arranged in the bottom box, so that the size of the bottom box front cavity is reduced, the high frequency output of the telephone receiver is suppressed, dentals of the voice frequency is reduced, and sounds are improved. Through holes are formed in a vibrating diaphragm, so that the weight of the vibrating diaphragm of the telephone receiver is reduced, the high frequency output of the telephone receiver is improved, and the responsive bandwidth of the telephone receiver is increased. Holes capable of opening and closing are formed in a circuit board body, the structure is simple and reasonable, the low frequency output can be improved, and the output of voice is enriched. The telephone receiver is more convenient to use and meets the needs of people in daily life.
Owner:SUZHOU YICHUAN TECH CO LTD
Magnetic suspension bearing control system and magnetic suspension bearing
ActiveCN112240346AAvoid distractionsImprove response bandwidthShaftsRotary machine partsControl systemMechanical engineering
The invention provides a magnetic suspension bearing control system and a magnetic suspension bearing, and relates to the technical field of magnetic suspension. The magnetic suspension bearing control system comprises a processor, a synchronization signal generation module, a displacement signal conversion circuit, a post-processing circuit, an A / D conversion module, a pulse width modulation module, a frequency division circuit, a synchronization module and a power amplifier. Under the common effect of all the elements, The A / D conversion module and the power amplifier are synchronized through the synchronization signal sent by the synchronization module, the impact current and impact voltage interference caused by a device switch in the power amplifier are effectively avoided, the response bandwidth of the system can be increased, the response speed is increased, and the contradiction between the signal-to-noise ratio and the dynamic response performance is effectively solved.
Owner:TIANJIN EMAGING TECH
Photoelectric detector and preparation method thereof
ActiveCN112563349AImprove coupling efficiencyImprove performanceFinal product manufactureSemiconductor devicesPhotovoltaic detectorsWaveguide
The invention relates to a photoelectric detector and a preparation method thereof. The photoelectric detector is of a transverse PN junction structure or a longitudinal PN junction structure, and comprises a semiconductor substrate provided with top-layer silicon, wherein a cone-shaped silicon waveguide is formed on the top silicon, the cone-shaped silicon waveguide is provided with a first end and a second end, and the area of the first end is smaller than that of the second end; the upper surface, close to the first end, of the silicon waveguide is covered with a first polycrystalline silicon layer; the upper surface, close to the second end, of the silicon waveguide is covered with a germanium layer, and the germanium layer and the first polycrystalline silicon layer are spliced together; wherein the P doped region and the N doped region are arranged in the top silicon layer and / or the germanium layer; and electrodes respectively formed on the upper surfaces of the P-doped region and the N-doped region. The coupling structure of the germanium-silicon photoelectric detector input waveguide active absorption region is optimized, high-efficiency coupling of the germanium-silicon photoelectric detector input waveguide active absorption region and the germanium-silicon photoelectric detector can be achieved, response is improved, and device power consumption is reduced.
Owner:INST OF MICROELECTRONICS CHINESE ACAD OF SCI
Self-adaptive framework control system and method for improving control moment gyroscope bandwidth
ActiveCN110018634ACapable of adaptive controlRealize adaptive adjustmentControllers with particular characteristicsLow speedControl system
The invention discloses a self-adaptive framework control system and method for improving control moment gyroscope bandwidth. The system comprises a self-adaptive double-loop PI controller, a speed observer and a bearing aging degree judgment module; the self-adaptive double-loop PI controller is used for controlling a low-speed framework motor of a control moment gyroscope and is established on the basis of a traditional current-loop and speed-loop double-loop PI controller, wherein gain parameters in the current-loop and speed-loop PI controller all have a self-adaptive adjustment function;the speed observer is used for observing the difference between relative actual speed and relative instruction speed of the low-speed framework motor of the control moment gyroscope and converting thedifference into a criterion of self-adaptive control; and the bearing aging degree judgment module is used for judging the change of frictional resisting moment after long-time running of a bearing and under the initial condition of the bearing, and the gain parameters of the self-adaptive double-loop PI controller are self-adaptively adjusted according to the change of the frictional resisting moment.
Owner:BEIJING INST OF CONTROL ENG
Full-closed-loop interference rate compensation self-stabilization control method under geodetic coordinate system
ActiveCN112696981ASuppress pointing control interferenceSuppression position outer ring resonanceWeapon control systemsElectric machineryDrive motor
The invention provides a full-closed-loop interference rate compensation self-stabilization control method under a geodetic coordinate system. The full-closed-loop interference rate compensation self-stabilization control method comprises the steps that a course angle, a pitch angle and a roll angle of an SINS are gathered, and a high-low angle and an azimuth angle of an artillery are gathered; angular velocity values of an SINS gyroscope group, a turret gyroscope group and a vehicle body gyroscope are gathered, interference angular rates in an azimuth direction and a high-low direction under the geodetic coordinate system are extracted, and filtering correction is performed to obtain azimuth and high-low compensation angular rate control quantities; the stable control rate control instruction and the interference compensation angular rate control instruction are combined to serve as a servo drive speed total instruction; and high-low and azimuth servo drivers gather respective motor angular rates, perform high-order sliding mode speed control strategy calculation according to the speed control instruction to obtain a current loop control instruction and drive motors to control artillery turning motions according to a given control quantity. The full-closed-loop interference rate compensation self-stabilization control method under the geodetic coordinate system has the advantages of being high in response bandwidth, accurate in interference rate compensation and the like, and the artillery barrel pointing high-precision stability under the condition of a movable base seat large firing angle is realized.
Owner:西北机电工程研究所
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