27 results about "Absolute calibration" patented technology

The invention relates to the technical field of semiconductor material photoelectric detection, and discloses a whole-course calibration method of a microwave photoconductive attenuation tester, which comprises the following steps: steady-state optical calibration: establishing reference mapping from light intensity to absolute carrier concentration; performing sweep frequency perturbation measurement at each concentration working point to obtain multiple groups of complex response data; separating an instrument transfer function from sample differential response sensitivity by adopting a system identification algorithm; an integral differential sensitivity reconstruction curve is converted into an absolute calibration model by using an anchor point; starting closed-loop feedback control to lock a specific phase, and verifying the model; and outputting an absolute calibration model and an instrument transfer function as a static reference and a dynamic operator. According to the invention, the absolute concentration anchor point is established through steady-state optical calibration, integral reconstruction is carried out on the differential response sensitivity decoupled by dynamic frequency sweep measurement, and finally, the anchor point is utilized to determine the integral constant, so that the accuracy and reliability of carrier concentration quantitative analysis are improved.

The invention relates to the technical field of optical precision measurement, in particular to a rotation and translation absolute calibration method based on a nerve radiation field, a medium and equipment. The method comprises the following steps: acquiring at least three groups of interference measurement data of a measured mirror under original, rotation and translation poses by using an interference measurement system to be calibrated, inputting pixel coordinates and position coding information in the data into a neural radiation field network, optimizing network parameters through a self-supervised training strategy, and completing calibration of a reference mirror surface shape. Compared with a traditional Zernike method, the scheme adopts a neural radiation field to construct a double-branch network, can adaptively learn complex surface shape space distribution, and improves medium-high frequency error separation precision; the error of the reference mirror and the measured mirror is synchronously and directly output by double branches without successive dependence, so that error transmission and accumulation are avoided; the self-supervised training mechanism implicitly compensates pose deviation and noise interference through redundancy constraint, and shows higher engineering robustness.

The invention discloses an absolute method broadband microphone calibration device, which comprises a broadband sound source, a translation rotating table, a laser vibration measurement system and a measurement and control system, and is characterized in that the broadband sound source generates a broadband pulse sound signal to form a broadband pulse sound field, and the translation rotating table drives the broadband sound source to perform translation and rotation motion to form a broadband pulse sound field; the laser vibration measurement system measures the vibration velocity of an air mass point in the pulse sound field, scanning of the pulse sound field is achieved through translation and rotation of the broadband sound source, the calibrated broadband microphone is installed in the pulse sound field, and the sound center position of the calibrated broadband microphone coincides with the center point position of a scanning plane; and the measurement and control system controls the laser vibration measurement system to scan the broadband pulse sound field, collects the output of the laser vibration measurement system, reconstructs the pulse sound field, and realizes absolute method calibration of the calibrated broadband microphone. According to the method, the boundary dimension, the number and the reciprocity of the microphone to be calibrated are not required, segmented calibration is not required, and absolute method calibration of the broadband microphone at 20-100 kHz can be realized.

The invention relates to the technical field of optical detection, and discloses a self-calibration method, system and equipment for a high-precision spliced interferometer, and the method comprises the steps: obtaining a plurality of sub-aperture measurement data obtained by testing a detected mirror through an interferometer in a random stepping mode; performing first-step calibration according to the measurement data of the plurality of sub-apertures to obtain a first reconstructed surface shape of a reference mirror and a first reconstructed full-aperture surface shape of a measured mirror in the interferometer; and performing second-step calibration according to the first reconstructed surface shape and the first reconstructed full-aperture surface shape to obtain a second reconstructed surface shape of the reference mirror and a second reconstructed full-aperture surface shape of the measured mirror. On the premise that extra hardware is not introduced, absolute surface shape reconstruction of the reference mirror and the measured mirror in splicing interference measurement is achieved only through algorithm innovation, high-precision calibration and elimination of second-order out-of-focus item errors in the meridional direction are achieved, namely absolute calibration can be achieved only through data processing, key second-order errors are calibrated, and the accuracy of calibration is improved. And the detection accuracy of the optical element is improved.

The present application relates to the printing technical field, specifically to a kind of color registration calibration method, device and equipment based on virtual nozzle.The method includes: selecting one nozzle as reference nozzle from several nozzles, and selecting a column of nozzles as reference nozzle column from reference nozzle;A virtual nozzle is constructed, and the offset adjustment value of virtual nozzle relative to the reference nozzle column is preset;The calibration value of each nozzle column relative to the reference nozzle column is obtained, and is recorded as relative calibration value;The relative calibration value is converted into the calibration value of each nozzle column relative to virtual nozzle according to offset adjustment value, and is recorded as absolute calibration value;According to absolute calibration value, each nozzle column is calibrated.The embodiment of the present application converts relative calibration value into absolute calibration value, when a certain nozzle column needs to be calibrated separately, it will not affect the absolute calibration value of other nozzle columns, thereby greatly improving the efficiency of printing calibration.

The invention discloses an absolute calibration method for an interferometer with spherical output wavefront. An interferometer, a spherical standard lens, a computer-generated hologram and a plane mirror are included. Firstly, the computer-generated holography works in a spherical mode a, the computer-generated holography is placed in and out of focus positions of an interferometer for measurement, and then the computer-generated holography is rotated by 180 degrees for measurement; after the four steps of measurement are completed, the computer-generated holography works in a spherical mode b, the computer-generated holography is placed in and out of focus positions of the interferometer for measurement, and then the computer-generated holography is rotated by 180 degrees for measurement; then the plane mirror is placed at the cat eye position for measurement; according to computer-generated hologram manufacturing error characteristics, through the nine times of measurement, all errors in measurement results are decoupled, computer-generated hologram manufacturing errors including substrate errors, pattern distortion errors and etching depth errors are removed, interferometer system errors are obtained, and absolute calibration of the interferometer system errors is completed; the method is ingenious in design, high in precision and high in engineering application value.

A method for on-orbit absolute radiometric calibration of an optical satellite with full field of view and full dynamic range. The method belongs to the field of aerospace-to-earth optical remote sensing technology, and specifically relates to the field of on-orbit absolute radiometric calibration of satellites. The method comprises the following steps: 1. The satellite maneuvers to radiometric calibration posture 1, sets the exposure time and rotation angle of the spectral radiometer in this posture, and continuously collects the spectral radiance of direct sunlight; 2. Expands the diffuse reflection plate to angle #imgabs0#, sets the exposure time and rotation angle of the spectral radiometer in this posture, and continuously collects the spectral radiance of diffusely reflected sunlight; 3. The satellite maneuvers to radiometric calibration posture 2, expands the diffuse reflection plate to angle #imgabs1#, sets the exposure time and rotation angle of the space camera in this posture, and continuously collects the spectral response value of the space camera; 4. Based on the data collected in steps 1‑3, calculates the absolute calibration coefficients of all spectral segments of the space camera, and completes the on-orbit absolute radiometric calibration of the optical satellite.

The application belongs to the field of gene sequencing, and discloses a microdroplet digital PCR absolute calibration method for mixed standard substances for high-throughput sequencer calibration and application thereof. The method comprises the following steps: providing N sets of primer probes for N targets in the standard substance; full background specificity verification: for the i th set of primer probes, it is necessary to prove that it can specifically detect the i th target, and prove that it has no specific detection signal in the mixed DNA sample composed of the remaining N-1 targets; only using all the primer probes verified in S2, performing parallel digital PCR detection on the standard substance sample; and calculating the absolute copy number concentration of each target according to the detection result. The method ensures the quantitative "purity" of each target in a complex mixed background, provides guarantee for high-confidence calibration results from the process design, and improves the throughput and efficiency of multi-target detection.

The invention discloses an absolute calibration device and method for an acceleration sensor under an ultra-high acceleration condition, and the device is characterized in that a loading force value and carrier mass are known values, namely, under the condition that an acceleration value is known, an unloading stress impact method is used for enabling a stand column bearing the carrier mass to generate rebound stress; the carrier with the acceleration sensor is impacted to generate high-frequency and high-acceleration motion, and the voltage output response of the sensor is measured, so that the amplitude-frequency characteristic of the acceleration sensor under the high-frequency and high-acceleration condition is obtained. When the cross spring bears the carrier mass block, the unloading force is changed into the vibration force of the spring, and a response value of low-frequency excitation in the sensor can be generated. The acceleration sensor is a double-second-order oscillation system, and the sensitivity is a function of the carrier mass, the rigid connection strength and the sensor installation direction, so that the influence degree of the parameters can be measured through structure adjustment, and ideal calibration that the vibration mass block in the acceleration sensor is only acted by acceleration force can be realized; the technology cannot be realized in the prior art.

The present invention discloses a method for improving the absolute calibration accuracy of a ground-based microwave radiometer. Based on the ground-based microwave radiometer used on platforms such as offshore platforms, small islands in the sea, polar edges, and ships, the method proposes to use a movable shielding source body to perform absolute calibration on the system. This method solves the electromagnetic interference, humidity, salinity, temperature and other meteorological factor interferences of the ground-based microwave radiometer in the external field environment, eliminates the influence of the external field test environment on the equipment safety and equipment calibration, and has the characteristics of high efficiency, high precision and wide application range.

The application relates to the technical field of optical measurement, and discloses a bottle body displacement detection method in a printing process based on an intelligent sensing system, which comprises the following steps: calculating a basic dynamic eccentricity by using a bottle body nominal radius, a sensor standard center distance and a horizontal distance measuring value; calculating a measured vertical slope by using a vertical distance measuring value and deducing a taper deviation compensation factor; calculating an eccentricity after curvature compensation according to the compensation factor and the basic dynamic eccentricity; calculating an intensity contrast amplitude by using a dual-wavelength reflection intensity to deduce a reflectivity perturbation index; calculating a current time modulation reference displacement by using the perturbation index modulation; calculating a first-order flutter speed and a phase shift pseudo displacement amount based on the current time modulation reference displacement and a time interval; fusing the two to calculate a harmonic flutter envelope amplitude; and separating and calculating an absolute calibration displacement amount based on a structure damping coefficient and the harmonic flutter envelope amplitude.

The present application belongs to the technical field of tokamak, and particularly relates to an absolute calibration system of electron cyclotron radiation based on a blackbody source. The present application comprises an adjustable mirror, a blackbody source, a chopper, a microwave antenna, a band-stop filter, a high-pass filter, a low-noise radio frequency amplifier, a directional coupler, a radio frequency mixer, a directional coupler, a voltage-controlled microwave source, a signal generator, a band-pass filter, an intermediate frequency amplifier, a power divider, an intermediate frequency band-pass filter, an intermediate frequency amplifier, an intermediate frequency mixer, an intermediate frequency Gunt oscillator, an adjustable attenuator, a band-pass filter, a detector, a low-pass filter, a video amplifier, a data collector, an electronic antenna and an industrial computer. The present application is simple in method for obtaining electron cyclotron radiation, good in stability, low in difficulty, can be calibrated in real time during discharge, and is very convenient.

The invention relates to a single digital hologram aberration absolute calibration method based on digital displacement, which belongs to the technical field of optical measurement and comprises the following steps: acquiring a sample hologram and demodulating to obtain a phase diagram; obtaining a mask pattern by adopting an edge detection method; sequentially displacing the phase diagram along x and y directions by using an image processing technology; performing difference calculation to obtain two groups of global phase difference data; extracting two groups of local system aberrations by using the mask pattern; performing differential processing on the Chebyshev polynomials after sequential displacement, and obtaining two groups of local polynomial differential data by using the mask pattern; calculating a polynomial coefficient through differential data, and fitting a global system aberration; subtracting the global system aberration from the original sample phase diagram to obtain a sample phase diagram after aberration elimination; various complex aberrations can be eliminated while the high-frequency phase information of the sample is reserved only through single collection, a three-dimensional displacement device and multiple collection are not needed, and the requirements for the experimental environment and equipment are remarkably reduced.

This invention relates to the field of optical measurement and calibration technology, and in particular to a method, medium, and apparatus for calibrating a plane reference mirror in a vertical interferometer. The method involves placing a calibration plate as a temporary mirror under test in the measurement optical path of a vertical Fizeau interferometer. At at least one measurement point, the calibration plate is continuously rotated around its own rotation center. The rotation centers at each measurement point are offset from the central optical axis of the plane reference mirror and equidistant. Multiple frames of surface shape measurement data are collected at each measurement point, and the absolute surface shape error of the plane reference mirror is obtained by arithmetic averaging of all measurement point data. This method, through the specific offset measurement point settings, systematically changes the spatial orientation of the calibration plate at different points, offsetting central symmetry errors and suppressing asymmetric errors and random noise. It achieves high-precision and robust absolute calibration without the need for complex algorithms. Compared with traditional methods, it combines accuracy, efficiency, and practicality, is suitable for various application scenarios, and provides a framework for subsequent efficiency optimization.

The present invention discloses an in-situ composite calibration method for improving the accuracy of a spacecraft's on-orbit temperature measurement system, comprising: screening the consistency of temperature sensors to be carried on the spacecraft; arranging a reference temperature source on the spacecraft; performing absolute calibration on the temperature sensor and its temperature measurement circuit in the on-board reference temperature source; designing a standard resistor on the satellite and performing precise temperature control on the standard resistor to prevent its temperature drift; measuring the resistance value of the standard resistor in each temperature measurement channel, calibrating the measurement deviation of each channel, and achieving absolute calibration of the measurement deviation and consistency of each channel; utilizing the drift characteristics of the temperature sensor in the reference temperature source to perform relative calibration on the remaining temperature sensors on the satellite. The present invention solves the problem that the deviation of on-orbit temperature measurement of a spacecraft gradually increases over time, thereby ensuring the accuracy and consistency of the temperature measurement system during the long life cycle of the spacecraft; and timely discovering and diagnosing abnormally drifting sensors on the satellite through cross-calibration between similar sensors.

The application relates to the technical field of semiconductor material photoelectric detection, and discloses a full-range calibration method of a microwave photoconductive decay tester, which comprises the following steps: steady-state optical calibration, establishing a reference mapping of light intensity to absolute carrier concentration; performing frequency sweep perturbation measurement at each concentration working point to obtain multiple sets of complex response data; adopting a system identification algorithm to separate the instrument transfer function and the sample differential response sensitivity; integrating the differential sensitivity reconstruction curve, converting the anchor point into an absolute calibration model; enabling closed-loop feedback control to lock a specific phase, verifying the model; outputting the absolute calibration model and the instrument transfer function, and making a static reference and a dynamic operator. According to the application, the absolute concentration anchor point is established through steady-state optical calibration, the differential response sensitivity decoupled by dynamic frequency sweep measurement is integrated and reconstructed, and finally the integral constant is determined by using the anchor point, so that the accuracy and reliability of carrier concentration quantitative analysis are improved.

The present invention discloses a method for measuring microwave emissivity of a scene based on reflection, comprising: placing an observation target on a flat surface, receiving microwaves emitted from the observation target and cold air at the same emission angle #imgabs0#, reflecting from the observation target, and obtaining a first output voltage; placing the observation target on a flat surface, receiving microwaves emitted from the observation target and cold air at the same emission angle #imgabs1#, reflecting from a reference wall, then reflecting from the observation target, and then reflecting from the reference wall, and obtaining a second output voltage; receiving microwaves emitted from the cold air at an emission angle #imgabs2#, reflecting from the reference wall, and obtaining a third output voltage; receiving microwaves emitted from the cold air at an emission angle #imgabs3#, obtaining a fourth output voltage; and calculating the emissivity of the observation target at an emission angle #imgabs4#. This rapid emissivity measurement method can calculate the microwave emissivity of the observation target without absolute calibration, and has the advantages of low hardware requirements and simple process operations.

The invention relates to a spectrometric calibration device (1), comprising an intensity-calibrated broadband light source (2) and a cosine-corrected transmission diffuser (3) coupled to said light source. The invention also relates to the use of this device for the absolute calibration of both micro and macro spectro-imaging systems. Figure 1

The application discloses an aerosol parameter inversion method based on a coherent Doppler laser radar, and comprises the following steps: emitting laser pulses to the atmosphere through the coherent Doppler laser radar, and receiving echo signals reflected back; correcting the echo signal carrier-to-noise ratio of the coherent Doppler laser radar in terms of distance, focusing function and system constant to obtain an attenuation backscattering coefficient; and inverting the attenuation backscattering coefficient to obtain the extinction coefficient and the backscattering coefficient of the aerosol. The application realizes absolute calibration of the echo signal intensity of the atmospheric aerosol, and inversion of the backscattering coefficient and the extinction coefficient of the aerosol.

The invention discloses a pressure sensor frequency characteristic absolute calibration method and a pressure generator calibration device, and the method comprises the steps: enabling an air inlet seat of a periodic pressure generator calibration device to provide an air supply structure for a pressure chamber, and enabling the pressure rise time in the pressure chamber to be consistent with the time from the opening to complete opening of an air inlet of the pressure chamber, measuring to obtain a response waveform of the pressure sensor under the excitation frequency, and determining calibration related parameters by utilizing the response waveform of the pressure sensor under the excitation frequency and combining two known conditions of the excitation frequency and the static pressure; the calibration related parameters comprise excitation time t1, overshoot, a reference phase difference theta1, peak excitation time t3, a peak phase difference theta2, change of the overshoot along with excitation frequency, and linearity of peak response time and excitation time; and obtaining a phase-frequency characteristic diagram and an amplitude-frequency characteristic diagram of the pressure sensor according to the calibration related parameters.

The present disclosure provides a method and apparatus for measuring the content of radioactive substances and a neutron coincidence measurement apparatus, relating to the field of nuclear measurement technologies. The method includes: establishing a geometric model of a measurement object according to the appearance of the measurement object with radioactive substances to be measured in a predetermined area; obtaining the relative position information between the geometric model of the measurement object and a measurement model including simulated neutron detectors, obtaining material information corresponding to the measurement object and associating it with the geometric model; obtaining the detection result of the simulated neutron detectors for the neutrons generated by the fission of the simulated radioactive substances based on the simulated measurement object information by using the generalized semi-Markov process simulation method; obtaining a calibration coefficient of the measurement object according to the simulated mass of the simulated radioactive substances and the detection result, so as to measure the content of the radioactive substances to be measured by using a measurement apparatus corresponding to the measurement model according to the calibration coefficient. This method improves the accuracy of measuring the content of radioactive substances.

The invention discloses a full-view-field full-dynamic-range on-orbit absolute radiometric calibration method for an optical satellite. Belongs to the technical field of spaceflight over-the-ground optical remote sensing, and particularly relates to the technical field of satellite in-orbit absolute radiometric calibration. The method comprises the following steps of: 1, maneuvering a satellite to a radiation calibration attitude 1, setting exposure time and a rotation angle of a spectrum radiometer under the attitude, and continuously collecting direct solar radiation light spectrum radiance; 2, unfolding the diffuse reflection plate to an angle # imgabs0 #, setting the exposure time of the spectrum radiometer and the rotation angle of the diffuse reflection plate under the attitude, and continuously collecting the solar diffuse reflection light spectrum radiance; 3, maneuvering the satellite to a radiometric calibration attitude; 2, unfolding the diffuse reflection plate to an angle # imgabs1 #, setting the exposure time of the space camera and the rotation angle of the diffuse reflection plate under the attitude, and continuously collecting the spectral response value of the space camera; and 4, calculating absolute calibration coefficients of all spectrum bands of the space camera according to the data acquired in the steps 1-3, and completing optical satellite in-orbit absolute radiometric calibration.

The invention relates to the technical field of optical measurement calibration, in particular to a plane reference mirror calibration method for a vertical interferometer, a medium and equipment. The method comprises the steps that a calibration plate is arranged on a measurement light path of a vertical Fizeau interferometer to serve as a temporary measured mirror, the calibration plate is driven to continuously rotate around the rotation center of the calibration plate at at least one measurement point position, the rotation center of each measurement point position and the central optical axis of a plane reference mirror are arranged in an off-axis mode, the distances are equal, and multi-frame surface shape measurement data are collected at each measurement point position; and arithmetic averaging is carried out on all measurement point data to obtain the absolute surface shape error of the plane reference mirror. According to the method, through specific off-axis measurement point position setting, spatial orientations of different point positions of a calibration plate are systematically changed, centrosymmetric errors are offset, asymmetric errors and random noise are inhibited, a complex algorithm is not needed, and high-precision and high-robustness absolute calibration is realized. Compared with a traditional method, the method has precision, efficiency and practicability, is suitable for various application scenes, and provides a framework for follow-up efficiency optimization.

The present application relates to the field of optical precision measurement, in particular to a rotation and translation absolute calibration method based on neural radiation field, medium and equipment. The method steps are: obtaining at least three groups of interference measurement data of the measured mirror under the original, rotation and translation pose of the to-be-calibrated interference measurement system, inputting the pixel coordinates and position coding information in the data into the neural radiation field network, optimizing the network parameters through the self-supervised training strategy, and completing the calibration of the reference mirror surface. Compared with the traditional Zernike method, the present scheme adopts a neural radiation field to construct a double-branch network, can adaptively learn the complex surface shape space distribution, and improve the separation accuracy of medium and high frequency errors; the double-branch synchronously directly outputs the errors of the reference mirror and the measured mirror, without dependence on the sequence, avoiding error transmission and accumulation; the self-supervised training mechanism implicitly compensates the pose deviation and noise interference through redundant constraints, and shows higher engineering robustness.

The invention discloses a temperature scanning absolute calibration method based on a strong field side electron cyclotron radiometric calibration rate, and relates to the technical field of absolute temperature calibration, and the method comprises the steps: carrying out the relative calibration of an electron cyclotron radiometer at a weak field side through a magnetic field difference calibration method, and obtaining a relative electron temperature distribution structure at the weak field side; on the basis of the obtained signals and the assumed core electron temperature, calculating to obtain relativistic offsets of all diagnosis channels of the electron cyclotron radiometer on the strong field side; a relative electron temperature distribution structure measured by the electron cyclotron radiometer on the strong field side is obtained through relativistic offset on the electron cyclotron radiometer on the strong field side; increasing the electron temperature of the discharge plasma in the magnetic field based on the assumed electron temperature of the core until the electron temperature distribution structures measured on the scanned strong field side and weak field side are consistent, and determining the assumed electron temperature of the core as an absolute temperature; and more accurate and reliable electronic temperature data support is provided for operation and research of the Tokamak device.

The invention discloses an infrasound sensor in-situ calibration method, and belongs to the technical field of infrasound sensor in-situ calibration, an infrasound sensor in-situ calibration scheme is designed by adopting an acoustic signal calibration method, and a piston sounder comprises a piston sounding unit and a piston sounding control unit which are integrated into a whole. The piston sound production unit is connected with the to-be-calibrated infrasound sensor through a gas circuit, the gas circuit is provided with a solenoid valve used for controlling the on-off of the gas circuit, and the solenoid valve, the piston sound production unit and the to-be-calibrated infrasound sensor are all in signal connection with an infrasound monitoring system data collector. The infrasound monitoring system remotely controls the on-off of an electromagnetic valve and a piston sounder through an infrasound monitoring system data collector, and achieves the in-situ calibration of the sensitivity absolute value and the frequency response of an infrasound sensor through the collection and analysis of an infrasound sensor self-calibration electric signal. The problems that the application range of an existing infrasound sensor calibration method is limited, and absolute calibration of the sensitivity of the sensor cannot be achieved are effectively solved.

The invention relates to a spectrometric calibration device (1), comprising an intensity-calibrated broadband light source (2) and a cosine-corrected transmission diffuser (3) coupled to said light source. The invention also relates to the use of this device for the absolute calibration of both microscopic and macroscopic spectral imaging systems.