10 results about "Absolute calibration" patented technology

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 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.

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 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 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.

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 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 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 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.