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31results about How to "Guaranteed Compensation Accuracy" patented technology
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Active power filter selective harmonic compensation control method
ActiveCN103427419AEasy to implementGuaranteed Compensation AccuracyActive power filteringHarmonic reduction arrangementActive power filterSelf adaptive
The invention discloses an active power filter selective harmonic compensation control method based on a frequency self-adaptive resonant controller. The active power filter selective harmonic compensation control method comprises the steps of acquiring power grid voltage, load current, active power filter output current and active power filter direct-current-side voltage; controlling output through an independent direct current control and independently controlling harmonic current through an independent control fundamental current according to a load signal; obtaining a modulation signal according to fundamental current control output and harmonic current control output and generating a switch signal of a controlling grid-connected inverter according to the modulation signal. The active power filter selective harmonic compensation control method can achieve selective harmonic compensation to load harmonic current and keep the compensation effect at rated frequency under the power grid frequency fluctuation condition.
Owner:陈锡忠
Display brightness compensation method and device and equipment
ActiveCN109256096AUniform brightnessImprove the display effectStatic indicating devicesCompensation effectBrightness perception
The invention provides a display brightness compensation method and device and equipment. The display brightness compensation method comprises the steps that brightness of each pixel block in a targetarea is acquired; the initial reference brightness is adjusted according to the brightness of each pixel block, and target compensation data of each pixel block are calculated according to the adjusted reference brightness and the brightness of each pixel block, wherein the target compensation data are within a predetermined compensation range; and according to the target compensation data of each pixel block, the brightness of each pixel block is compensated. According to the display brightness compensation method and device and the equipment, on the premise of ensuring compensation precision, the compensation effect of uneven brightness is improved, and the display performance of a display screen is improved.
Owner:CHENGDU ZHONGDIAN PANDA DISPLAY TECH CO LTD
Method for compensating heterogeneity of shield magnetic field coil through winding
InactiveCN103454461AReduce non-uniformityMeeting Calibration Testing NeedsInstrument screening arrangementsMagnetic shieldConductor Coil
The invention provides a method for compensating heterogeneity of a shield magnetic field coil through a winding. The shield magnetic field coil is wound by the compensating winding with the particular specification, and distribution of magnetic lines of force of an original magnetic field coil is changed through the compensating winding, so that the heterogeneity of the shield magnetic field coil is increased in a magnitude mode. The magnetic field generated by the compensating winding has equal magnetic force and the opposite direction with the heterogeneous field additionally produced because a magnetic shield layer changes distribution of the magnetic lines of force in the magnetic field coil, and therefore the purpose of compensating the heterogeneity of the shield magnetic field is achieved.
Owner:710TH RES INST OF CHINA SHIPBUILDING IND CORP
Probe of electrical vortex sensor and electrical vortex sensor
InactiveCN105806202ASmall sizeGuaranteed Compensation AccuracyUsing electrical meansElectricityPhysics
The invention discloses a probe of an eddy current sensor and the eddy current sensor. The probe of the eddy current sensor includes a detection coil, a temperature compensation coil and a magnetic isolation plate; the magnetic isolation plate is arranged between the detection coil and the temperature compensation coil, and is respectively connected to the detection coil and the temperature The compensation coils are parallel. The invention solves the problem that the temperature compensation precision of the current eddy current sensor is increased at the cost of increasing the probe, realizes reducing the probe size on the basis of ensuring the compensation precision, and achieves the effect of ensuring the detection displacement sensitivity and reducing the probe size.
Owner:ZHUHAI GREE REFRIGERATION TECH CENT OF ENERGY SAVING & ENVIRONMENTAL PROTECTION
Exoskeleton robot motor self-check correction system and method
ActiveCN106602969AGuaranteed Compensation AccuracyProgramme-controlled manipulatorElectric motor controlCorrection methodSelf checking
An exoskeleton robot motor self-check correction system and a method are provided; the motor comprises a drive module driving an exoskeleton robot body; the drive module comprises a servo motor and a motor self-check correction module; the self-check correction method comprises the following steps: starting the self-check correction module before a rehabilitation user uses the exoskeleton robot to carry out rehabilitation training every day; using a hall sensor to record a self-check error compensation value everyday; forming a compensation value under each rehabilitation training mode according to the recorded error compensation value; aiming at motor corrections of temporarily added novel training steps and following each training step under the rehabilitation training mode, the corresponding motor compensation values are given. The motor self-check correction steps are simple, thus satisfying rehabilitation training precision high requirements of the exoskeleton robot.
Owner:HENAN NORMAL UNIV
Wireless signal compensation method and device, numerical value determination method and device, equipment and medium
ActiveCN111901263AGuaranteed Compensation AccuracySave storage spaceLine-faulsts/interference reductionTransmitter/receiver shaping networksTelecommunicationsReal-time computing
The invention discloses a wireless signal compensation method and device, a numerical value determination method and device, equipment and a storage medium. The wireless signal compensation method isused to compensate wireless signals, and comprises the steps of: obtaining a group of target parameter values of a corresponding fitting function for wireless signal compensation according to the current state information, wherein the group of target parameter values comprises a first number set for amplitude compensation and / or a second number set for phase compensation; determining a target compensation coefficient of at least one frequency component of the wireless signal according to the fitting function and the group of target parameter values; and compensating the corresponding frequencycomponent in the wireless signal by using the target compensation coefficient of each frequency component to obtain a target signal.
Owner:GUANGDONG OPPO MOBILE TELECOMM CORP LTD
TEC-based thermal infrared imager automatic correction method and device
The invention relates to a TEC-based thermal infrared imager automatic correction method and device. The method comprises the steps of: in a calibration process of the thermal infrared imager, measuring a suspected pixel of the thermal infrared imager in each temperature range, adopting the suspected pixel existing in each temperature range as a dead point, and enabling the rest suspected pixels to serve as unstable pixels of each temperature point; in the using process, acquiring an image of the thermal infrared imager by a processing circuit, completing non-uniformity correction, acquiring the dead point position and acquiring a current temperature; searching an unstable pixel according to the current temperature; directly compensating the dead point position in the image; and judging whether the unstable pixel is a blind pixel or not, if so, performing compensation, and otherwise, not performing processing. According to the method, dead point and unstable pixel calibration is carried out on all temperature points, meanwhile, non-uniformity correction is completed, in the using process, blind pixel judgment does not need to be carried out on each image, corresponding compensationmethods are directly adopted for dead points and unstable pixels for compensation, processing is easy, and the real-time performance is good.
Owner:北京富吉瑞光电科技股份有限公司
OLED display device, power-on transmission method for compensation data and image display method
ActiveCN111899692ANo need to increase the areaImprove experienceStatic indicating devicesRandom access memoryLogic cell
The invention provides an OLED display device, a power-on transmission method for compensation data and an image display method. A display compensation value random access memory and a display compensation logic unit in a driving chip are arranged at an electronic client; the electronic client is electrically connected with the display compensation value random access memory, so that all structures communicate with one another. In the power-on non-display stage, compensation data is stored in the display compensation value random access memory of the electronic client and images are compensated through the display compensation logic unit of the electronic client. As the display compensation value random access memory and the display compensation logic unit are arranged at the electronic client, the area of the driving chip is not occupied, the area of the driving chip does not need to be increased, and the problem of distortion does not exist; different frame frequencies do not need tobe switched by erasing original data, black screen time does not exist, the image display effect is better, and the user experience is good; compensation data corresponding to different frame frequencies are directly called, so that the compensation accuracy can be ensured, and the compensation effect is better.
Owner:WUHAN TIANMA MICRO ELECTRONICS CO LTD
External compensation pixel circuit and display panel
InactiveCN113270071AIncrease drive currentMeets Accuracy Requirements for Current SensingStatic indicating devicesCapacitanceDriving current
The invention discloses an external compensation pixel circuit and a display panel. The circuit comprises a signal input module, a light emitting control module, an energy storage capacitor, a light emitting device and a driving current sampling module. The signal input module is connected with the driving current sampling module and the light-emitting device through the energy storage capacitor, the signal input module is connected with a controlled end of the light-emitting control module, the light-emitting control module is further connected with the light-emitting device, and the light-emitting control module is used for adjusting the gray scale of the light-emitting device according to a received pulse width modulation signal; the driving current sampling module is used for collecting the driving current of the light-emitting device, so that the driving chip adjusts the signal voltage through the driving current to carry out external compensation. According to the invention, a certain driving current can be maintained when the light-emitting device displays medium and low gray scales, so that the driving chip can adjust the magnitude of the signal voltage according to the driving current to realize external compensation, and the compensation precision of the external compensation can be guaranteed.
Owner:CHANGSHA HKC OPTOELECTRONICS CO LTD +1
Fiber-optic gyroscope zero offset determination method
ActiveCN113639737AAchieve precise compensationHigh precisionSagnac effect gyrometersThermodynamicsEngineering
The invention relates to a fiber-optic gyroscope zero offset determination method. The method comprises the following steps: S1, obtaining a zero-bias temperature rise model table and a zero-bias temperature drop model table under a preset temperature change rate; s2, querying a zero-bias heating model table and a zero-bias cooling model table, and obtaining a heating zero-bias value and a cooling zero-bias value corresponding to the current environment temperature of the tested fiber-optic gyroscope; s3, calculating a zero-bias heating model weight and a zero-bias cooling model weight corresponding to the current temperature; and S4, carrying out weighted operation on the temperature rise zero-bias value and the temperature drop zero-bias value corresponding to the current temperature obtained in the step S2, and finally obtaining the gyroscope zero-bias value of the fiber-optic gyroscope at the current environment temperature and the temperature change rate. The weighted zero-bias compensation value can be calculated in real time according to the temperature, the temperature rising and falling trend and the temperature change rate, the problem that a traditional zero-bias compensation method is poor in environmental adaptability is solved, and the method is suitable for zero-bias modeling and compensation of fiber-optic gyroscopes of different models or precisions.
Owner:BEIJING AEROSPACE TIMES OPTICAL ELECTRONICS TECH
Ambient light compensation circuit for infrared receiving device
ActiveCN113629997AGuaranteed constant gainEliminate spikesApparatus without intermediate ac conversionElectric variable regulationCapacitanceHemt circuits
The invention relates to an ambient light compensation circuit for an infrared receiving device. The circuit comprises a potential detection unit, a voltage integration unit and a voltage-current conversion unit which are connected in sequence, wherein the potential detection unit is used for receiving a first voltage signal (VSAM) and comparing the first voltage signal (VSAM) with a reference voltage; the voltage integration unit comprises a first switch (SW1) for controlling the charging of a capacitor and a second switch (SW2) for controlling the discharging of the capacitor, and the first switch (SW1) and the second switch (SW2) are controlled according to an output signal of the potential detection unit, so that the capacitor is charged or discharged to output a second voltage signal (VX); and the voltage-current conversion unit is used for converting the second voltage signal (VX) to output a compensation current. According to the invention, the ambient light current compensation can be realized, and the stable gain is realized.
Owner:WUXI CRYSTAL SOURCE MICROELECTRONICS CO LTD
Band gap reference voltage circuit
InactiveCN102375470ADesensitizationHigh compensation accuracyElectric variable regulationElectrical resistance and conductanceAudio power amplifier
The invention relates to a band gap reference voltage circuit. The voltage VDD is divided into three paths; the first path is connected with an emitter of a triode T2 through a resistor R1, and a base of the T2 is connected with a collector and then is grounded; the second path is connected with an emitter of a triode T1, and a base of the T1 is connected with a collector and then is grounded; the third path is grounded through resistors R4 and R2, and a voltage Vref output point is positioned between the resistor R4 and the resistor R2; and the first path and the second path are connected to the input end of an operational amplifier OP, and the input end of the OP is grounded through a resistor R3, and the output end of the OP directly controls a constant current source circuit. The band gap reference voltage circuit has a startup enhancing function.
Owner:张伟
A self-checking and correcting system and method for a motor used in an exoskeleton robot
ActiveCN106602969BGuaranteed Compensation AccuracyProgramme-controlled manipulatorElectric motor controlExoskeleton robotEngineering
An exoskeleton robot motor self-check correction system and a method are provided; the motor comprises a drive module driving an exoskeleton robot body; the drive module comprises a servo motor and a motor self-check correction module; the self-check correction method comprises the following steps: starting the self-check correction module before a rehabilitation user uses the exoskeleton robot to carry out rehabilitation training every day; using a hall sensor to record a self-check error compensation value everyday; forming a compensation value under each rehabilitation training mode according to the recorded error compensation value; aiming at motor corrections of temporarily added novel training steps and following each training step under the rehabilitation training mode, the corresponding motor compensation values are given. The motor self-check correction steps are simple, thus satisfying rehabilitation training precision high requirements of the exoskeleton robot.
Owner:HENAN NORMAL UNIV
A method and device for automatic calibration of infrared thermal imager based on tec
Owner:北京富吉瑞光电科技股份有限公司
Bending machine deflection compensation workbench with wedge blocks integrally connected
The invention discloses a bending machine deflection compensation workbench with wedge blocks integrally connected. The deflection compensation workbench comprises a groove type base and a cover platearranged at the upper end of the base; the groove bottom of the groove type base is provided with a wedge block installation plate, the multiple lower wedge blocks and the multiple upper wedge blocksfrom bottom to top in sequence; and the upper end surface of the wedge block installation plate is provided with a plurality of concave grooves in the length direction of the wedge block installationplate, the multiple lower wedge blocks are embedded in the multiple concave grooves correspondingly so that the lower wedge blocks and the installation plate can be connected into a whole, the upperwedge blocks are installed on the upper end surfaces of the lower wedge blocks in a matched mode by adopting inclined surfaces different in angle, and the end of the installation plate is connected with a driving motor. According to the technical scheme of the invention, integral deflection compensation is achieved, the integral compensation precision of the workbench is ensured, in addition, thestructure is simple, disassembling is convenient, and the cost is low.
Owner:黄石三锐精密制造有限公司
Micro-LED display equipment and feedback compensation circuit thereof
PendingCN114677966AImprove build speedHigh compensation accuracyStatic indicating devicesLED displayHemt circuits
The invention provides Micro-LED display equipment and a feedback compensation circuit thereof, and the feedback compensation circuit comprises a data current generation module, a current detection module, an I-V conversion module, a reference voltage module, a driving signal generation module and a complementary switch module, the current detection module is used for providing a reference voltage for a feedback line in a programming stage so as to accelerate the establishment speed of a feedback current; the I-V conversion module is used for generating a voltage signal according to a difference value between the feedback current and a data current and inputting the voltage signal to the complementary switch module; the reference voltage module is used for providing reference voltage, the driving signal generation module is connected with the complementary switch module, and the complementary switch module is used for providing driving signals for the pixel circuit so as to control the charging process and the discharging process of a driving tube in the pixel circuit. According to the technical scheme, the compensation precision and the compensation speed of the Micro-LED display equipment can be ensured at the same time.
Owner:CENT SOUTH UNIV
Cable automatic calibration and automatic compensation method of comprehensive detection equipment
PendingCN113376560AReduce calibration stepsReduce workloadElectrical measurementsFrequency bandCalibration function
The invention relates to a cable automatic calibration and automatic compensation method for comprehensive detection equipment; the method employs an operation terminal, the comprehensive detection equipment, a power meter, a signal generator and a switch to carry out automatic calibration and automatic compensation of a cable. The method comprises the following steps: firstly, obtaining power calibration data of the signal generator, then connecting one end of the cable to an output port of the signal generator, and connecting the other end of the cable with the power meter; and setting parameters required to be calibrated of the cable in a cable automatic calibration function of the operation terminal, selecting measured power calibration data of the signal generator, starting automatic calibration work of the cable, and automatically generating a power compensation value of each frequency point after the cable is calibrated. According to the invention, automatic calibration of a self-defined frequency band can be carried out on any type of cables, corresponding cable compensation files can be stored, and real-time loading of other cable data and modification of cable compensation data can be supported.
Owner:CHINA ELECTRONIS TECH INSTR CO LTD
Self-powered circuit breaker and air cylinder assembly thereof
ActiveCN103367026AReduce temperature riseIncrease the rated current parametersHigh-tension/heavy-dress switchesAir-break switchesAir compressionEngineering
The invention relates to the field of high-voltage circuit breakers, in particular to a self-powered circuit breaker and an air cylinder assembly thereof. The self-powered circuit breaker comprises an air cylinder assembly, wherein the air cylinder assembly comprises an air compression chamber air cylinder and an expansion chamber air cylinder; one end of the air compression chamber air cylinder is closed by a valve base, and the other end of the air compression chamber air cylinder has an open structure; the expansion chamber air cylinder is spliced into the open end of the air compression chamber air cylinder; one end, which is inserted into the air compression chamber air cylinder, of the expansion chamber air cylinder is further provided with a cylindrical extension segment; the valve base is provided with a convex compensating structure for being inserted into the expansion chamber air cylinder; and the size of the compensating structure is equal to the volume of the extension segment. In the self-powered circuit breaker, a plurality of contact fingers can be arranged correspondingly between the expansion chamber air cylinder and the air compression chamber air cylinder according to requirements, so that the resistance of a main loop is reduced, and the temperature rise of the circuit breaker is further reduced; and the size of the expansion chamber air cylinder does not change, so that the original short-circuit breaking performance of the circuit breaker is ensured.
Owner:STATE GRID CORP OF CHINA +1
A coning error compensation method and system based on flow-type rotation vector
ActiveCN113252032BGuaranteed Compensation AccuracyIncrease the system attitude update frequencyNavigational calculation instrumentsNavigation by speed/acceleration measurementsMathematical modelComputational physics
The invention provides a method and system for coning error compensation based on flow-type rotation vector. The method includes: analyzing the coning error generation mechanism of laser inertial navigation based on the attitude transfer matrix of laser inertial navigation; and establishing a mathematical model of coning error under the condition of coning motion , deduce the flow-type rotation vector structure for compensating the coning error; determine the coning error compensation term coefficients of different sub-samples in the flow-type rotation vector structure; based on the angle increment of the current sampling period and the angle increment of the historical sampling period, use the flow The rotary vector structure realizes the online compensation of the coning error. The invention provides a flow-type rotation vector algorithm based on laser gyroscope angle incremental output, which ensures the compensation accuracy of the laser inertial navigation system cone error and at the same time increases the update frequency of the system attitude, reduces the cone error introduced by the algorithm, and finally realizes the improvement of the system attitude solution. frequency and accuracy purposes.
Owner:HUAZHONG PHOTOELECTRIC TECH INST (CHINA SHIPBUILDING IND CORP THE NO 717 INST)
Control Method of Gravity Compensated Vertical Subsystem Based on Sliding Mode Surface
ActiveCN105109713BCompensate for the effects of non-linear factorsGuaranteed Compensation AccuracyCosmonautic condition simulationsForming faceGravitational force
The invention discloses a gravity compensation vertical subsystem control method based on a slip form face. A gravity compensation vertical subsystem composed of a controller, a sensing unit, an executer and a spring module is provided. A coordinate system is established based on a working principle of the gravity compensation vertical subsystem. The system is modeled through a lagrange equation, a model is simplified, and a simplified spring mass system with the interference, model indeterminancy and outside motivation is obtained. According to the characteristics of the system model, a PID algorithm, a PISS algorithm and a PISST algorithm suitable for different task requirements are given according to the different task requirements. The three algorithms are integrated, algorithm selection is finished by setting parameters of the controller, and a criterion for parameter adjustment of the three algorithms is given. The gravity compensation vertical subsystem control method has the beneficial effects that a tension sensor and a displacement sensor are comprehensively applied, the compensation precision is improved, the comprehensive degree of the controller is high, and parameters are easy to adjust.
Owner:BEIHANG UNIV
Ambient Light Compensation Circuit for Infrared Receiver
ActiveCN113629997BGuaranteed constant gainEliminate spikesApparatus without intermediate ac conversionElectric variable regulationCapacitanceHemt circuits
The invention relates to an ambient light compensation circuit for an infrared receiving device, comprising a potential detection unit, a voltage integration unit and a voltage-current conversion unit connected in sequence, wherein the potential detection unit is used to receive a first voltage signal (VSAM) , and compare the first voltage signal (VSAM) with the reference voltage; the voltage integration unit includes a first switch (SW1) for controlling the charging of the capacitor and a second switch (SW2) for controlling the discharging of the capacitor, according to the output of the potential detection unit The signal controls the first switch (SW1) and the second switch (SW2), so as to charge or discharge the capacitor to output a second voltage signal (VX), and the voltage-current conversion unit is used to convert the second voltage signal ( VX) is converted to output compensation current. The invention can realize ambient light current compensation and realize stable gain.
Owner:WUXI CRYSTAL SOURCE MICROELECTRONICS CO LTD
A nonlinear damage compensation method and system in a long-distance optical communication system
ActiveCN113489543BImprove balanceGuaranteed Compensation AccuracyDistortion/dispersion eliminationElectromagnetic receiversCommunications systemGain
The invention relates to a nonlinear damage compensation method and system in a long-distance optical communication system. The method includes: performing gain adjustment on a complex signal at a receiving end, and outputting a gain signal; dividing the gain signal by spans and steps to obtain the step number division Perform dispersion compensation and nonlinear phase compensation on the gain signal divided by the number of steps, and output the signal to be judged; perform logistic regression judgment on the signal to be judged to determine the judgment result; the judgment result is that the compensation meets the standard or the compensation fails to meet the standard. ; When the judgment result is that the compensation does not meet the standard, the loss value is determined according to the judgment result; the nonlinear compensation coefficient of the nonlinear phase compensation is adjusted according to the loss value to perform cyclic compensation; when the judgment result is that the compensation reaches the standard, the gain signal completes the compensation. The present invention can reduce the overall complexity while ensuring the signal compensation accuracy.
Owner:BEIJING UNIV OF POSTS & TELECOMM
A high-precision positioning tool compensation device for workpiece machining
InactiveCN110524307BImprove cleanlinessGuaranteed accuracyAutomatic control devicesMeasurement/indication equipmentsAutomatic controlSlag
The invention discloses a compensation device of a high-precision positioning tool for workpiece machining. The compensation device includes a base, one end of the base is connected with a detection assembly, and the other end is connected with a fixing assembly; the detection assembly is used for detecting the position of a cutter and feeding back to a control center to adjust the cutter, and thefixing assembly is used for fixing the base and the detection assembly to a machining device. The compensation device is stable in structure, is flexible and reliable, and is convenient to disassemble and assemble; with the arrangement of a sealing protection device, a sensor can be protected from being polluted or damaged by the processing disintegrating slag at any time; a cleaning device is additionally arranged in the sealing protection device, the sensor can be guaranteed to be clean further, so that the precision of the sensor is guaranteed, and the compensation precision is guaranteed;in addition, the sensor is installed in an automatic telescopic device, the full-automatic control is achieved; the sensor is matched with the sealing protection device, so that the sensor is more intelligent; the fixing assembly is arranged at the tail of the base, so that the compensation device can be installed outside various large complex machine tools, and the universality is high.
Owner:HENAN POLYTECHNIC UNIV
OLED display device, compensation data power-on transmission method, and image display method
ActiveCN111899692BNo need to increase the areaImprove experienceStatic indicating devicesRandom access memoryLogic cell
The application provides an OLED display device, a compensation data power-on transmission method, and an image display method. By setting the display compensation value random access memory and the display compensation logic unit in the drive chip on the electronic client, and electrically connecting each structure In the stage of power-on and non-display, the compensation data is stored in the display compensation value RAM of the electronic client, and the image is compensated by the display compensation logic unit of the electronic client. Since the display compensation value random access memory and the display compensation logic unit are set on the electronic client, it does not occupy the area of the driver chip, there is no need to increase the area of the driver chip, and there is no problem of distortion; and there is no need to erase the original data for different Frame rate switching, no black screen time, better image display and better user experience; directly calling the compensation data corresponding to different frame rates can ensure the accuracy of compensation and make the compensation effect better.
Owner:WUHAN TIANMA MICRO ELECTRONICS CO LTD
A Bandgap Reference Voltage Circuit
InactiveCN102375470BDesensitizationHigh compensation accuracyElectric variable regulationElectrical resistance and conductanceAudio power amplifier
The invention relates to a band gap reference voltage circuit. The voltage VDD is divided into three paths; the first path is connected with an emitter of a triode T2 through a resistor R1, and a base of the T2 is connected with a collector and then is grounded; the second path is connected with an emitter of a triode T1, and a base of the T1 is connected with a collector and then is grounded; the third path is grounded through resistors R4 and R2, and a voltage Vref output point is positioned between the resistor R4 and the resistor R2; and the first path and the second path are connected to the input end of an operational amplifier OP, and the input end of the OP is grounded through a resistor R3, and the output end of the OP directly controls a constant current source circuit. The band gap reference voltage circuit has a startup enhancing function.
Owner:张伟
A Fast Phase Distortion Compensation Method Based on Downsampled Phase Distortion Principal Component Analysis
ActiveCN105157561BFast compensationGuaranteed Compensation AccuracyMaterial analysis by optical meansUsing optical meansSingular value decompositionKernel principal component analysis
The invention discloses a rapid phase distortion compensation method based on downsampling phase distortion principal component analysis. The rapid phase distortion compensation method comprises the steps of: photographing a hologram by using a camera, extracting +1 order spectrum after acquiring frequency spectra of the hologram, removing other frequency spectra, and translating the +1 order spectrum to the center of the frequency spectra; extracting frequency spectra of phase distortion components from the frequency spectra, and extracting a downsampling phase diagram of an object through inverse Fourier transform; extracting the first principal component of the phase diagram through singular value decomposition, and fitting to obtain parabolic equations in x and y directions by utilizing a least square method; and fitting again to obtain accurate parabolic equations in the x and y directions after eliminating error points; carrying out sub-pixel interpolation on parabolas in the x and y directions to obtain an upsampling distortion phase diagram; and acquiring a compensated phase diagram by subtracting the distortion phase diagram from an original phase diagram of the object.
Owner:NANJING UNIV OF SCI & TECH
Active Power Filter Selective Harmonic Compensation Control Method
ActiveCN103427419BGuaranteed Compensation AccuracyEasy to implementActive power filteringAc network to reduce harmonics/ripplesGrid connected inverterCompensation effect
Owner:陈锡忠
Precision compensation method for clock source
ActiveCN113067578AGuaranteed Compensation AccuracyIn the process of punctuality, separate compensation to achieve high precision and highGenerator stabilizationEnergy efficient computingLearning dataCurve fitting
A precise compensation method for a clock source relates to the field of clock compensation, and comprises the following steps: taming self-learning data, removing abnormal data, respectively separating temperature and frequency drift characteristics, respectively fitting frequency drift and temperature characteristic curves by adopting a multi-time curve fitting mode, and in a time keeping process, and selecting the optimal characteristic for automatic separate compensation. High-precision time keeping is realized, and the problems that a traditional time keeping algorithm adopts a least square method for curve fitting, the learning accuracy is low, frequency drift and temperature of a frequency source are not separated, and the problems that the consistency of the traditional compensation effect is low and the multiple tests are highly random are solved.
Owner:成都金诺信高科技有限公司
Method of Compensating Non-uniformity of Shielded Magnetic Field Coil by Winding
InactiveCN103454461BReduce non-uniformityMeeting Calibration Testing NeedsInstrument screening arrangementsMagnetic shieldConductor Coil
The invention provides a method for compensating heterogeneity of a shield magnetic field coil through a winding. The shield magnetic field coil is wound by the compensating winding with the particular specification, and distribution of magnetic lines of force of an original magnetic field coil is changed through the compensating winding, so that the heterogeneity of the shield magnetic field coil is increased in a magnitude mode. The magnetic field generated by the compensating winding has equal magnetic force and the opposite direction with the heterogeneous field additionally produced because a magnetic shield layer changes distribution of the magnetic lines of force in the magnetic field coil, and therefore the purpose of compensating the heterogeneity of the shield magnetic field is achieved.
Owner:710TH RES INST OF CHINA SHIPBUILDING IND CORP
Self-energy circuit breaker and its cylinder assembly
ActiveCN103367026BReduce temperature riseIncrease the rated current parametersHigh-tension/heavy-dress switchesAir-break switchesAir compressionExpansion chamber
The invention relates to the field of high-voltage circuit breakers, in particular to a self-powered circuit breaker and an air cylinder assembly thereof. The self-powered circuit breaker comprises an air cylinder assembly, wherein the air cylinder assembly comprises an air compression chamber air cylinder and an expansion chamber air cylinder; one end of the air compression chamber air cylinder is closed by a valve base, and the other end of the air compression chamber air cylinder has an open structure; the expansion chamber air cylinder is spliced into the open end of the air compression chamber air cylinder; one end, which is inserted into the air compression chamber air cylinder, of the expansion chamber air cylinder is further provided with a cylindrical extension segment; the valve base is provided with a convex compensating structure for being inserted into the expansion chamber air cylinder; and the size of the compensating structure is equal to the volume of the extension segment. In the self-powered circuit breaker, a plurality of contact fingers can be arranged correspondingly between the expansion chamber air cylinder and the air compression chamber air cylinder according to requirements, so that the resistance of a main loop is reduced, and the temperature rise of the circuit breaker is further reduced; and the size of the expansion chamber air cylinder does not change, so that the original short-circuit breaking performance of the circuit breaker is ensured.
Owner:STATE GRID CORP OF CHINA +1
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