121results about How to "Valid calibration" patented technology

The invention provides a calibration method for a free space material electromagnetic parameter test system; the method is used for realizing the calibration of dual port network scattering parameter matrixes of the free space material test system by adopting a calibration method with a vector network analyzer and preset formulas. By adopting the scheme, the calibration of the free space material test system can be carried out effectively; by creating a separation error term transmission/reflection model, transceiver antennae are not needed to be moved by a precision clamp, only a simple calibration kit is used by combining a time domain gate technology, thus the calibration of the free space material electromagnetic parameter test system is completed, and the dependence on the high-precision test clamp is avoided.

Provided is a hollow flat illumination device used for a back light unit, comprising a housing, a reflector arranged at the bottom of the housing and an illuminous surface part arranged on top of the housing. A light guide space arranged between the reflector and the illuminous surface part. A LED light source is adjacent the light guide space. The LED light source is provided with a distribution board and an array of LED arranged on the distribution board. A collimated light tube at the illumination side of the LED light source to converge the light from the LED light source in the thickness direction of the housing and drive the light to diffuse parallel to the light axis of the LED array. The collimated light tube has the functionality portions (InA, InB1 and InB2) to refract the light from the LED array, guides the refracted light to go through the body of the collimated light tube and illuminates the light to the light guide space. The collimated light tube also has the functionality portions (TIR1 and TIR2), which wholly reflects the light entering into the collimated light tube and illuminates the light to the light guide space. The hollow flat illumination device is compacted and provides the bright and uniform light.

A wearable human body motion state data monitoring system comprises a receiver and a plurality of human body motion state data monitoring devices; every human body motion state data monitoring device is worn by a subject at the waist and comprises a three-axis acceleration sensor and a processor; the three-axis acceleration sensor is used for monitoring the human body motion state data of the subject and sending the data to the processor; the processor is used for obtaining voltage data of a power supply battery of the processor and calibrating received X-axis acceleration, Y-axis acceleration and Z-axis acceleration data according to the power supply voltage data, and the calibrated data is sent to the receiver. According to the wearable human body motion state data monitoring system, voltage compensation and dip computation are performed on the collected human body motion state data in the motion state of the subject, the acceleration of a local coordinate system of every human body motion state data monitoring device is converted to a physical coordinate system, effective calibration is performed on the collected acceleration data, and data changes of a human body in all directions during a motion process can be reflected more truly.

A screen uniformity calibration method and a terminal device are disclosed in the embodiment of the present invention, wherein the screen of the terminal device applied to the terminal device comprises N regions, a photosensitive sensor is correspondingly arranged under each area, wherein, the method comprises the following steps of: displaying a color temperature test image when the terminal device is in a dark environment, wherein the color temperature test image is a solid color image whose brightness is higher than a preset value; collecting display parameters of each area of the screen, wherein the display parameters are color temperature or screen brightness; adjusting the display parameters of each of the regions with reference to preset target display parameters; where N is an integer greater than 1. The screen uniformity calibration method provided by the invention can quickly and effectively calibrate the screen uniformity of the terminal equipment.

The invention relates to a method for positioning an underwater wireless sensor network, which belongs to the technical field of wireless sensor network positioning. The method includes: obtaining a primary estimation coordinate of an unknown node by means of primary weighted centroid algorithm according to a measured distance between a beacon node and the unknown node; and setting the weightiness according to the distance value to select a plurality of proper beacon nodes to obtain a secondary estimation coordinate of the unknown node by means of secondary weighted centroid algorithm, and finally determining the coordinate of the unknown node. The method is low in calculation complexity, positioning accuracy is improved, estimation errors are reduced, and the method is applicable to positioning of underwater wireless sensor networks.

The invention discloses a calibration module for TIADC system clock mismatch errors and a calibration method. The invention is characterized in that the calibration module comprises a delay module, a subtractor module, a clock sampling module, an error judgment module and a variable delay line module; a sampling clock signal of a first sub channel ADC as a reference clock signal, a clock calibration module is disposed between a sampling clock signal of each of other M-1 sub channel ADC and the corresponding sampling hold circuit of each of the M-1 sub channel ADC; and in this way, the M-1 clock calibration modules constitute the calibration module. The invention is suitable for calibration of a TIADC system of any number of channels and for signals in the entire Nyquist sampling frequency, can be used for easily obtaining the clock mismatch errors of each channel and performing efficient compensation, and therefore achieve the calibration of TIADC clock mismatch errors quickly and accurately with less hardware spending.

The invention relates to a calibration method for in-car temperature. The method comprises the steps of obtaining a detection value A of the in-car temperature detected through a temperature sensor, calculating a calibration value B of the in-car temperature, and obtaining the in-car temperature C according to calculation of the detection value A of the in-car temperature and the calibration value B of the in-car temperature. According to the method, by detecting the detection value of the in-car temperature, the calibration value of the in-car temperature is calculated, the in-car temperature is calibrated according to the calibration value of the in-car temperature and the detection value of the in-car temperature, and therefore the in-car temperature can accurately reflect the actual temperature in a car; moreover, an automatic air-conditioner automatically controls execution mechanisms such as a hybrid air door motor, an air blower and a mode type motor of the automatic air-conditioner according to the calibrated in-car temperature and other parameters, it can be ensured that the automatic air-conditioner can accurately obtain and control the in-car temperature, and therefore the comfort level of in-car environment can be improved.

A voltage reference circuit fixable in temperature coefficient comprises a starting circuit, a positive temperature coefficient current generating circuit, a negative temperature coefficient current generating circuit, a zero temperature coefficient current generating circuit, a zero temperature coefficient current regulating circuit and a fixed temperature coefficient voltage synthesis circuit. Image current of the positive temperature coefficient current generating circuit and the negative temperature coefficient current generating circuit is output to the zero temperature coefficient current regulating circuit and the fixed temperature coefficient voltage synthesis circuit, the zero temperature coefficient current regulating circuit provides image current for the fixed temperature coefficient voltage synthesis circuit, and the reference voltage end of the fixed temperature coefficient voltage synthesis circuit outputs stable reference voltage. The voltage reference circuit fixable in temperature coefficient fully utilizes the high-matching characteristic of an integrated circuit to enable the reference voltage temperature coefficient to be unrelated with the temperature characteristics of a resistor and an MOS transistor, achieves the fixed temperature characteristic of a reference voltage source and calibrates the reference voltage to enable the temperature coefficient of the reference voltage not to be influenced.

The invention discloses a spectral data calibration method based on black and white calibration plates. The method comprises the following steps of: firstly, collecting spectral data of a black calibration board and a white calibration board respectively; then collecting spectral data of a to-be-detected sample and carrying out data modeling, and recording the spectral data as spectral data X andthe model as a spectral model M; calculating actual spectral data Y of the to-be-detected sample by combining the spectral data of the black calibration plate and the spectral data X of the sample; calculating the actual reflectivity H of the to-be-detected sample by combining the spectral data of the white calibration plate and the actual spectral data Y of the sample; and finally, carrying out data modeling on the reflectivity H by adopting a modeling method which is the same as that of the spectral model M, and judging the quality of the spectral model through a model correlation coefficient and a root-mean-square error. According to the method, the spectral data can be effectively calibrated, the spectral model quality and the spectral prediction accuracy are further improved, meanwhile, the method is easy to implement, and the problem that the portable near infrared spectral data is difficult to calibrate is solved to a great extent.

The present invention relates to a method of calibrating sub-nanometer critical dimensions using pitch offsets, thereby calibrating metrology tools used to measure characteristics of semiconductor devices. A method for calibrating a sub-nanometer critical dimension using a pitch offset includes the steps of: measuring a first pitch; measuring a second pitch, wherein the second pitch is offset from the first pitch by a pitch offset; performing a comparison with the A step of comparing the first distance with the second distance; and judging the measurement accuracy according to the comparison step. From the aforementioned comparison, appropriate calibration steps can be taken to reduce the gap between the known and measured pitches. The method provided by the invention can effectively calibrate the metrology tool to the sub-nanometer level by using the offset of the sub-nanometer spacing.

The invention relates to a multi-channel pressure gauge self-test device, a self-test method thereof and a self-test system thereof. The multi-channel pressure gauge self-test device comprises a self-calibrating module. The self-calibrating module comprises a number of pneumatic commutation valves. Each pneumatic commutation valve is connected between an air-capacitor and a pressure sensor of a channel of a multi-channel pressure gauge. Each pressure sensor is connected with a micro control unit of the multi-channel pressure gauge. The self-calibrating module is connected with the micro-control unit. According to the invention, the self-calibrating channel function is increased based on the multi-channel pressure gauge; the function to calibrate multiple pressure gauges is kept; if an internal pressure sensor needs to be calibrated, multi-channel pressure sensor self-calibrating can be effectively and quickly carried out; and pressure sensor self-calibrating of all channels can be completed at one time simply with the connection of an external high-precision pressure gauge.

The invention provides a method for measuring and calibrating the flow volume and velocity of a numerically controlled shot blasting machine. A shot collector is provided. The flow volume and velocity of blasted shots are calibrated by measuring the mass of shots blasted at different flow velocities at the same time. An effective and simple method for calibrating the flow volume and velocity of a numerically controlled shot blasting machine is provided. Through the method, the precision of flow volume and velocity of a numerically controlled shot blasting machine can be verified, and the influence of flow volume and velocity on the shot blasting intensity is controlled effectively. The method separates collecting from weighing. A collecting and weighing integrated device can also be designed to facilitate detection.

The invention discloses a fiber Bragg grating sensing system with the wavelength scaleplate calibration function. The system is composed of a broadband light source of an ASE light source and an optical isolator, a tunable F-P filter, a coupler, a circulator, an FBG sensor array, an etalon, a first photoelectric detector, a second photoelectric detector, a data acquisition device, a computer, anda tunable power supply. PZT hysteresis and creep compensation are carried out by controlling the driving voltage of the F-P filter and thus the wavelength interval of the transmission spectrum peak value of the etalon linearly changes with time, so that the wavelength of the transmission spectrum peak value, as the scale line of the wavelength scaleplate, of the etalon is calibrated and a precisewavelength reference is provided for wavelength demodulation of the sensing grating. The wavelength of the sensing grating can be measured precisely and thus the physical quantities such as temperature and strain can be measured accurately based on the wavelength information of the sensing grating.

An embodiment of the invention discloses a calibration method for a capacitor mismatch error of a pipeline ADC (analog to digital converter). On the basis of the calibration-free structure of the traditional pipeline ADC, a calibration level with the capacitor mismatch error required to be calibrated is composed of a level MDAC (multiplying digital to analog converter) structure and a level-calibrated switch structure, and meanwhile, a capacitor mismatch error digital calibration circuit is added. During the calibration-level capacitor error extracting period, two special inputs are supported by the level-calibrated switch structure to a calibration-level sampling capacitor to obtain two digital codes containing the capacitor mismatch errors, and accordingly digital calibration is performed by extracting the calibration-level capacitor mismatch error. The calibration method is simple in structure, fewer additional elements are required, sequential control is easy, and the problem that poor static characteristics, caused by capacitor mismatch, is calibrated is solved.

The invention provides a high temperature calibration method of a free space terminal short circuit method complex dielectric constant test system. After a vector network analyzer carries out calibration, reflection parameters of a system when connects different calibration components under a normal temperature and variable temperatures are measured; through combining a preset formula, an error item is derived and an actual reflection parameter of the system which passes through a material to be measured and carries out reflection under a variable temperature environment is acquired. In the invention, through establishing a variable temperature environment separation error item reflection model, an antenna transmission/reflection segment system error item under a normal temperature is acquired and an air transmission segment phase change influence under a high temperature is corrected so that calibration of a free space terminal short circuit method material varying temperature test system can be effectively performed and test precision of the free space terminal short circuit method under the variable temperature environment is increased.

The invention provides a method. According to the method, coefficients of a calibration filter are updated according to calibration results after each calibration, so the calibration filter can excellently fit characteristics of output signals, accuracy of calibration is improved compared with the prior art, as the coefficients of the calibration filter change in a mode of adapting to the characteristics of the output signals in a whole calibration process, the calibration method provided can excellently adapt to relatively large change of output characteristics of a microphone array caused by aging or environment change factors of the microphone array, and the output signals can be effectively calibrated, moreover, in the calibration process, the coefficients of the calibration filter are adjusted through introducing a variable step NLMS algorithm, more rapid error convergence speed and smaller distortion error effects on the output signals can be realized through the variable step NLMS algorithm, and calibration optimization is realized.

The invention provides a full-MOS voltage and temperature monitoring method and monitoring circuit. The circuit comprises two annular oscillators RO1 and RO2, two time-digital converters TDC1 and TDC2, a temperature mapping module, a voltage mapping module, a reference clock frequency divider module and two compensation modules, wherein a reference block is provided by a crystal oscillator, poweris supplied to the annular oscillator RO1 through a core-domain power supply voltage VDD_CORE, power is supplied to the annular oscillator RO2 through a battery voltage VBAT, the reference clock is separately connected to the TDC1 and the TDC2 through the frequency divider, and output terminals of the TDC1 and the TDC2 are respectively connected to the temperature mapping module and the voltage mapping module. According to the method and circuit, real full MOS can be realized, extra masks are avoided, effective calibration of the PVT is realized, the monitoring precision is improved, and the method and the circuit are advantageous in that the structure is simple, the area is small, and static power consumption is avoided.

The invention discloses a measurement calibration method of a falling number tester. The measurement calibration method comprises the following steps of: putting the tester to be calibrated in an environment at the room temperature of 10-30 DEG C at first, wherein in the calibration process, the temperature change is not beyond 5 DEG C, the room-temperature humidity is controlled within a range of 20-85% RH, and no magnetic field or mechanical vibration is around the environment; and then carrying out the following steps of: 1, calibrating a timer of the falling number tester; 2, calibrating water bath temperature of the falling number tester; 3, calibrating the overall performance of the falling number tester; and 4, processing a measurement result, averaging test results in the first, second and third steps to obtain a test result of the falling number tester. The measurement calibration method disclosed by the invention is used for effectively calibrating the measurement precision of the falling number tester (wave pass 1900) used in the current laboratory, so that negative effects in subsequent production caused by measured incorrect measurement data when the measurement precision of the falling number tester is decreased can be avoided.

The invention discloses a quantum equipment calibration method and device, equipment and a medium. The quantum equipment calibration method comprises the steps of obtaining an actual output result of quantum equipment; inputting the actual output result into a quantum neural network for training to obtain a corresponding network output result; using the expected output result of the quantum device and the network output result to update the quantum neural network until the quantum neural network converges, and obtaining a trained quantum network line; and outputting a calculation result of the quantum device by using the trained quantum network line. Namely, equipment hardware is not directly debugged, training is carried out in a machine learning mode, the trained quantum network line is obtained, and the calculation result of the quantum equipment is output by utilizing the trained quantum network line, so that the quantum equipment can be effectively calibrated, the calibration complexity of the quantum equipment is reduced, and debugging is facilitated.

The invention provides a method for acquiring a relative loss value of a bonding surface of a bonding lath, and belongs to the field of quality detection of laser bonding crystal laths. The method comprises the following steps: firstly, acquiring a return loss proofreading value of a white light interference device by using a standard reflecting surface with known reflectivity; scanning and testing the depth direction of a vertical bonding surface in the to-be-tested lath through a delay line structure of an interferometer, and obtaining a distributed interference intensity signal of each reflecting surface and the depth positioning of the bonding surface; furthermore, using a known reflectivity film in the probe as a standard, converting the interference signal into a distributed result of reflectivity, and calibrating a measurement result by combining a loss calibration value of a standard reflecting surface; converting the surface reflectance measurement result into the refractive index of the crystal by using a Fresnel reflection formula, and further calculating a Fresnel reflectance theoretical value required by bonding surface treatment; and finally, comparing a reflectivitymeasurement value of the bonding surface with a Fresnel reflectivity theoretical value to obtain a relative loss value of the bonding surface so as to evaluate the quality of the bonding surface.

The invention discloses a calibration method for a touch screen, comprising a test unit, wherein a touch screen calibration program is pre-installed in the test unit; connecting the touch screen to betested with the test unit; whether the touch screen to be tested has any reaction or slow reaction is checked by the user. If the test is unqualified, clicking the calibration icon on the test touchscreen to exit the operation mode and enter the calibration mode; and if the test is unqualified, clicking the calibration icon on the test touch screen to enter the calibration mode. You need to seeif the touch coordinate value on the display matches the touch coordinate value on the test touchscreen, if there is a mismatch, the alarms will be displayed and the calibration parameters of the calibration algorithm will be modified. After modification, the touch screen will be checked manually again until the touch coordinate value on the display screen coincides with the touch coordinate valueon the test screen. The invention effectively calibrates the touch screen, and avoids the problems that the touch screen will not react or react slowly when the finger touches the screen after beinginfluenced by other factors.

The invention belongs to the field of nano-particle metering, and especially relates to a method for calibrating a combined type aerosol diluter. The method is characterized by measuring a particle concentration value before and after an aerosol diluter is used through a calibrated particle counter, calculating a dilution ratio of a diluter, and comparing the dilution ratio with a nominal value to complete calibration of the diluter. A calibrating system comprises an aerosol generator, a uniform mixer, and a standard particle counter. According to the method of the invention, a scientific and reasonable calibration method is adopted to ensure an accurate and reliable measured result; the method is capable of effectively calibrating the combined type aerosol diluter and improving measuring precision of analysis instruments such as the particle counter, thereby providing technical support for establishment of a traceability system of particle number concentration.