71results about How to "Achieving self-calibration" patented technology

The invention provides an optical axis included angle calibrating and focusing method and system and double-camera equipment. The calibrating method includes the steps that focusing is conducted on any feature point of a shot object, so that a first object distance value is acquired; the first imaging point coordinate value of the feature point on a first camera is determined; the second imaging point coordinate value of the feature point on a second camera is determined; the optical axis included angle of the double-camera equipment is determined according to the first imaging point coordinate value, the second imaging point coordinate value, the prestored parameters of the double-camera equipment, the first object distance value and a prestored optical axis included angle calculation formula. According to the technical scheme, self-calibration focusing of the double-camera equipment is achieved.

The invention provides a magnetic measurement apparatus based on atomic quantum effects, which is different from a present apparatus of measuring magnetic field strength. The method and apparatus of the invention utilize the energy level fission of high excitation state atoms caused by the Zeeman effect under the effect of a weak external magnetic field, and accurately controls the excitation frequency of an ultra-narrow line width laser to measure the spectral signal division based on EIT under the magnetic field effect. The intensity of a magnetic field to be measured can be calculated according to a division width. The multiple fission of the atomic magnetic energy level caused by the weak magnetic field Zeeman effect is linear, and accordingly, through fitting measurement results of widths of a plurality of division peak values, the self calibration of the intensity of the measured magnetic field can be realized. The new magnetometer can realize magnetic field intensity measurement with the sensitivity less than 0.1 T, and effectively improve the measurement precision with the further compression of a laser frequency line width. Moreover, the measured magnetic field strength can be effectively traced to an atom transition frequency, and excellent measurement accuracy and self-calibration can be realized.

The invention discloses a liquid level detection circuit, a device and a calibration method thereof. The liquid level detection circuit comprises a voltage controlled oscillator, a phase discriminator, a judgment unit and a variable resistor unit, wherein the voltage controlled oscillator is respectively connected with two output terminals of a sampling needle and the variable resistor unit, and outputs a first signal to the phase discriminator, the phase discriminator receives the first signal and a reference signal, and respectively outputs control voltage relevant to the frequency difference value of the first signal and the reference signal to the voltage controlled oscillator and the judgment unit, the judgment unit outputs a control signal to the variable resistor unit according to the control voltage in the calibration state, and the variable resistor unit sets the self resistance value according to the control signal. The invention compensates the capacitance through regulating the resistance value of an oscillator resistor, and realizes the self calibration of the liquid level defection device, and the replacement of the sampling needle by customers is easier.

The invention discloses a novel high-precision capacitor self-calibration analog-to-digital converter of a successive approximation type, and the converter is characterized in that the converter comprises a plurality of adjustment capacitor arrays, a calibration storage unit, a successive approximation control logic unit, and a calibration control logic unit; each to-be-adjusted sampling capacitor Ci is connected with one adjustment capacitor array; each adjustment capacitor array comprises a compensation capacitor and a residual capacitor; the upper electrode plate of each compensation capacitor and the upper electrode plate of each residual capacitor are respectively connected with a common end of the upper electrode plate of the corresponding sampling capacitor; the lower electrode plate of each compensation capacitor and the lower electrode plate of the sampling capacitor Ci; the lower electrode plate of each residual capacitor is connected with the lower electrode plate of the sampling capacitor Ci+1; the output end of a comparator is connected with the calibration storage unit through a gating switch and the calibration control logic unit; the calibration storage unit is connected with the switching control end of each compensation capacitor and the switching control end of each residual capacitor; the output end of the comparator is connected with the switching control end of the lower electrode plate of each sampling capacitor through the gating switch and the successive approximation control logic unit.

The embodiment of the invention discloses a method for determining the threshold value of a proximity sensor. The method comprises the steps of acquiring a current first signal value of the proximity sensor, selecting a corresponding default scale factor according to the acquired current first signal value, and determining the threshold value of the proximity sensor according to the product of the selected default scale factor and the current first signal value. Correspondingly, the embodiment of the invention further discloses a terminal. According to the method for determining the threshold value of the proximity sensor and the terminal, self-calibration of the threshold value of the proximity sensor can be achieved, and user experience is improved.

A method includes the steps of providing a common DC bus to interconnect power elements to a DC distribution system using power converters. A first group of one or more of the elements (main element) is used to execute the primary function by automatically maintaining the DC bus voltage following a set point. The DC bus voltage set point is intentionally changed with slow dynamics according to a secondary function executed by the main element such that the average DC bus voltage regulated by the main element changes. A local logic is used on each of the power elements connected to the DC bus but different from the main element to modify their power generation or consumption as a result of changes in the measured average DC bus voltage such that they contribute to the fulfillment of the secondary level of control.

The invention discloses an OEO (optoelectronic oscillator) based wide-range and high-precision absolute distance measurement system with a self-calibration function. The system comprises four lasers, two wavelength division multiplexers, an electro-optic modulator, an erbium-doped optical fiber amplifier, an optical add-drop multiplexer, two optical fibers with different lengths, two optical fiber tensioners, three optical couplers, two photoelectric detectors, two microwave filters with different center frequencies, two microwave amplifiers, two microwave power beam splitters and a microwave synthesizer. An oscillation loop comprises an optical path part and a circuit / microwave part. By means of OEOs, the accumulative amplification principle is applied to the wide-range absolute distance length measurement scheme for large-scale absolute distance measurement (km magnitude), and very high measurement precision (mu m magnitude) can be realized; the system can be widely applied to fields of industrial measurement and control, precision instrument manufacture and the like, is high in interference resisting capacity and good in stealthiness and has very good application prospect in the military field.

The invention discloses a self-adaptive electrode registration method for robust myoelectric control, and the method comprises the steps: completing the matching of a local region between training data (before electrode offset) and test data (after electrode offset) based on a convolutional neural network structure, and achieving the self-alignment or self-calibration of an electrode array; A completely unsupervised learning mode is used, no extra calibration data is needed, and the electrode self-calibration process is directly completed in the test stage. On the basis, the data of the overlapped recording areas before and after the array offset is identified, so that the high accuracy of the motion pattern identification can be ensured.

The present invention relates to a selfcalibration of capacitive pressure sensors with electrostatic forces. A pressure sensor calibration system comprises one or more pressures sensors for calibrating sensor parameters based on a membrane deflection or a membrane displacement from an electrostatic force. A measuring component measures capacitance values corresponding to applied voltages at the electrodes of the one or more pressure sensors. Sensor parameters are derived from capacitance measurements and a pressure measurement, which are utilized by a calibration component for calibration and recalibration of the one or more pressure sensors.

The invention relates to a single-phase overhead transmission line phase voltage self calibration method. By means of a space capacitor voltage dividing principle, a line and the ground are regarded as a bulky capacitor to divide voltage across the line, and air is taken as an insulating medium. An upper pole plate of a sampling capacitor is connected with the surface of a high-voltage wire insulating layer, a lower pole plate is hung in the air, a switch capacitor is connected in parallel with a capacitor between the upper pole plate and the high-voltage wire, by changing the capacitance value of the switch capacitor, the stray capacitance value between the upper pole plate and the wire is changed, the sampling capacitor can measure different voltage values, and therefore each unknown stray capacitance value and the voltage value to be measured can be worked out, and single-phase wire phase voltage non-contact self calibration is achieved. The single-phase overhead transmission line phase voltage self calibration method is suitable for distribution network distributed devices, and is better than existing voltage measuring schemes.

The invention provides a moving platform binocular ranging self-calibration method and device. The method comprises the following steps of acquiring the coordinates in a target image corresponding toa to-be-measured target acquired by two image acquisition devices, and the pose information of the two image acquisition devices; determining the target position of the to-be-measured target accordingto a transmission projection equation set established by the two coordinates and the two pose information; establishing a target function for minimizing a reprojection error; optimizing the pose information and the target positions of the two image acquisition devices to gradually reduce the target function; when the minimized reprojection error is smaller than a preset error threshold, stoppingiteration, and outputting an attitude angle compensation value and a calibrated target position; when a next target image of the to-be-measured target at the next acquisition moment is acquired, calculating the initial values of the two image acquisition devices at the next acquisition moment according to the attitude angle compensation value and the calibrated target position; and repeating the above steps until the ranging of the to-be-measured target is completed. According to the present invention, the measurement precision of a ranging system can be improved.

The invention discloses preparation and application of a photoelectricity and temperature dual-signal response sialic acid bio-sensor based on polymer dots. According to the sensor, two nano-materialsof fullerene (C60) and a Au cone serve as a substrate of the sensor, mercaptophenylboronic acid (MPBA) molecules are fixed through the bonding effect of Au-S bonds, and a large number of sialic acid(SA) molecules are captured. Antibodies marked by intertetraphenol doped polymer dot (TPP-pdot) functionalized sector rutile type titanium dioxide (R-Tio2) serve as probe molecules, excellent photocurrent response and good temperature response are achieved, and a dual-signal reading pattern is obtained. Based on the advantages, the dual-signal response bio-sensor is established, high-sensitivity detection of sialic acid is achieved, compared with a traditional single-signal reading sensor, the sensor is higher in accuracy and better in stability, and the situation that the detection result isfalsely positive or negative is avoided to a large degree.

The invention relates to a parallel-capacitor-based self-calibration method for a phase voltage of a three-phase overhead transmission line. On the basis of the spatial capacitive divider principle, the line and the ground are viewed as a large capacitor to carry out voltage dividing and the air is used as an insulating medium. Various stray capacitors, including the capacitor caused by the insulating layer and the capacitor existing at the interphase leads, between the three-phase lines are considered fully and a centralized parameter equivalent circuit is established. A switch capacitor is connected in parallel at an upper polar plate side and the stray capacitance value to the lead by the upper polar plate is changed by changing the capacitance value; different voltage values are measured at a sampling capacitor and thus all unknown stray capacitor values and to-be-measured voltage values are calculated, thereby realizing self-calibration of the three-phase line phase voltage. The method enables the distributed device requirement of the distributed network to be met and thus is superior to the existing voltage measurement plan.

The invention discloses a capacitance calibration method for a successive approximation type ADC (Analog to Digital Converter). The capacitance calibration method comprises the following steps: initializing differential mode digital weights and single-ended mode digital weights of all capacitors to be calibrated in a switched capacitor module according to digital weights of ideal capacitors; obtaining the actual digital weight of each capacitor to be calibrated in the differential mode in sequence, and assigning the digital weight corresponding to the differential mode; sequentially acquiring the actual digital weight of each capacitor to be calibrated in the single-ended mode, and assigning the actual digital weight to the corresponding single-ended mode digital weight; assigning each differential mode digital weight or each single-ended mode digital weight to each actual final digital weight according to the selected differential mode or single-ended mode; and adding the analog output signal of the successive approximation type ADC by bit by using each actual final digital weight to obtain a digital output signal. According to the invention, self-calibration of the capacitor can be realized, and an additional calibration capacitor array is not needed.

The invention relates to a terahertz radar detection system based on a Zynq platform and a method thereof. The system comprises a terahertz transmitting and receiving device, a Zynq processing platform, a control system, an upper computer and a two-dimensional motor. The terahertz transmitting and receiving device is in communication connection with the input end of the Zynq processing platform; the output end of the Zynq processing platform is in communication connection with the input end of the control system and the upper computer; and the output end of the control system is in communication connection with the control two-dimensional motor and the terahertz transmitting and receiving device. According to the terahertz multi-channel radar detection system based on the Zynq platform and the method thereof, the frequency synthesis and modulation waveform generation assembly is controlled by the control system, linear frequency modulation signals of continuous waves, narrow bands and wide bands are generated according to different detection modes, the Zynq processing platform serves as a core processing unit, so that the functions of multi-channel intermediate frequency echo data processing, self-calibration, target searching, high-resolution imaging and the like can be realized.

A cell voltage monitoring and self-calibrating device for a plurality of battery cells connected in series is disclosed. The device includes a first voltage measurement unit, a second voltage measurement unit, a first compensation unit, a second compensation unit and a calculating unit. It can measure voltages of each cell in a battery pack which provides power to electric equipment and calibrates itself during measurement.

The invention discloses a Raman light phase noise testing method and system based on cold atom interference, and the method comprises the steps: carrying out the atom trapping and cooling, and obtaining a cold atom group; preparing an atom initial state; enabling the cold atomic group to enter an interference area, and controlling an experiment time sequence to achieve atomic interference throughinteraction of three Raman light pulses and the cold atomic group; enabling atomic groups to enter a detection area for double-energy-level detection to obtain atomic interference fringes; setting a phase difference between the two beams of Raman pulses, and enabling the relative population to be placed at a stripe half-width position to obtain stripe phase jitter; deducting contribution of Ramanlight power noise, quantum projection noise and technical noise to obtain influence of Raman light relative to phase noise; changing the free evolution time of atoms in the interference process, repeating the steps, and solving an equation set according to the Leeson model and transfer functions under different experiment time sequences to obtain the Raman light phase noise spectrum. The problem that periodic calibration is needed in an existing phase noise measurement technology is solved, the test accuracy is improved, and a self-calibration function is provided.

The invention discloses an on-line calibration system and method of a PM2.5 / PM10 light scattering particulate matter monitor. The on-line calibration system consists of a particulate matter dynamic dilution and laminar flow mixer, a high efficiency filter, an air compressor, a frequency conversion fan, a mass flow controller, a constant speed sampling head, a particulate matter filter membrane collector and a constant current sampler. The on-line calibration system and method can calibrate the zero point, linearity and indication error of an instrument, eliminate the influences of environmental factors on the measurement results, and ensure the traceability and reliability of the measurement results. The calibration system and method can be integrated into a light scattering particle monitor, and can also be used as an independent calibration system to realize self-calibration, dynamic calibration and current calibration of the light scattering particle monitor.

The invention discloses an oxygen sensor with a self-calibration function. The oxygen sensor comprises a sensor body, a flue gas channel and a reference air channel, wherein the flue gas channel and the reference air channel are arranged in the sensor body. Tshe flue gas channel is a zirconium oxide pipe, a flue gas side electrode is sintered and mounted on the inner side of the flue gas channel,an air side electrode is sintered and mounted on the outer side of the flue gas channel, and the potential difference between the flue gas side electrode and the air side electrode is displayed through an electromotive force measuring instrument; two ends of the flue gas channel are respectively used as a flue gas inlet end and a compressed air recoil end, and compressed air is used for reverselypurging the flue gas channel; the reference air channel is arranged on the outer side of the flue gas channel, the air side electrode is arranged in the reference air channel, and reference air is introduced into the reference air channel and used for being compared with the oxygen content of compressed air for self-calibration. According to the invention, the self-calibration function of the oxygen sensor is realized through the comparison of the backflushing compressed air and the oxygen content in the reference air in the reference air channel, and the measurement accuracy of the oxygen sensor is ensured.

The invention discloses an MOCVD equipment real-time temperature measurement system self-calibration method and belongs to the technical field of semiconductor manufacture. The method includes according to an actual heat radiation ratio, arranging a point according to the actual heat radiation ratio on a theoretical heat radiation ratio-temperature curve trace, substituting the temperature value T corresponding to the point into a calculation formula, and acquiring calibration coefficients m1 and m2. By the aid of the method, the calibration coefficients m1 and m2 corresponding to a first wavelength lamda 1 and second wavelength lamda 2 of a dual wavelength temperature measurement structure can be acquired, the MOCVD equipment real-time temperature measurement system self calibration is implemented, and the consistence and accuracy of epitaxial film growth temperature measurement can be guaranteed.

An embodiment of the invention discloses an integrated gas detection probe based on laser spectrum absorption, and relates to the technical field of gas detection. The gas detection probe provided bythe invention comprises a shell, wherein a laser, a reflector unit, a beam expander, a photoelectric detection unit, a drive circuit and a detection circuit are arranged in the shell; the shell is provided with an air inlet; the laser is electrically connected to the drive circuit; the reflector unit reflects the laser emitted by the laser to the beam expander; and the photoelectric detection unitis electrically connected to the detection circuit and receives the laser from the beam expander. According to the gas detection probe provided by the scheme, the integrated and small-sized integrated design of a detection light path is realized, and the probe is simple and compact in structure, high in anti-interference capability, high in reliability and convenient for batch production.

The invention discloses a film growth reaction chamber equipment real-time temperature measurement system self calibration device and belongs to the technical field of semiconductor manufacture. The device comprises an actual heat radiation ratio acquisition unit and a calibration coefficient calculation unit; the actual heat radiation ratio acquisition unit is used for acquiring an actual heat radiation ratio; the calibration coefficient calculation unit is used for arranging a point according to the actual heat radiation ratio on a theoretical heat radiation ratio-temperature curve trace, substituting the temperature value T corresponding to the point into a calculation formula, and acquiring calibration coefficients m1 and m2. By the aid of the device, the calibration coefficients m1 and m2 corresponding to a first wavelength lamda 1 and second wavelength lamda 2 of a dual wavelength temperature measurement structure can be acquired, the film growth reaction chamber equipment real-time temperature measurement system self calibration is implemented, and the consistence and accuracy of epitaxial film growth temperature measurement can be guaranteed.

The invention provides a CMOS self-calibrating light intensity monitoring integrated circuit. In a light intensity measuring circuit, the output end is connected with the input end of a current voltage linear conversion circuit. The input end of the current voltage linear conversion circuit is connected with the output end of the light intensity measuring circuit and the first input end 3a of a self-calibrating / monitoring control switch array. The first input end of the self-calibrating / monitoring control switch array is connected with the output end of the current voltage linear conversion circuit. The second input end SEL is a self-calibrating control input end. The first output end and the second output end are connected with the first input end and the second input end of an output voltage sampling and holding circuit respectively. The first input end and the second input end of the output voltage sampling and holding circuit are connected with the first output end and the second output end of the self-calibrating / monitoring control switch array. The first input end and the second input end of a comparison amplifying circuit (5) are connected with the first output end and the second output end of the output voltage sampling and holding circuit respectively. The output end OUT2 is the output end of the circuit provided by the invention.

The invention discloses an intelligent sensor and an intelligent method thereof, and the intelligent sensor comprises a sensor module, a circuit switch module, a signal conditioning module and a processor; the sensor module is disconnected or connected with the signal conditioning module through the circuit switch module, and the processor is connected with the signal conditioning module and the circuit switch module; the sensor module is used for collecting measured data; the signal conditioning module is used for receiving and processing the data acquired by the sensor module and sending thedata to the processor; the processor is used for processing the data processed by the signal conditioning module and sending a control instruction to the circuit switch module; and the circuit switchmodule is used for receiving a control instruction of the processor to connect or disconnect the sensor module and the signal conditioning module. Through combined use of the processor and the basicsensor, the sensor is endowed with an intelligent capability, and an intelligent function is realized.