Noise sensitivity coefficient measurement method based on noise correlation
A technology of sensitivity coefficient and measurement method, which is applied in the direction of measuring devices, measuring electrical variables, instruments, etc., can solve the problems of affecting the normal operation of the atomic fountain frequency standard, the inability to realize the real-time measurement of the atomic fountain frequency standard, and heavy workload.
Active Publication Date: 2019-08-16
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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Problems solved by technology
[0006] 1. Real-time measurement under the normal working mode of the atomic fountain frequency standard cannot be realized;
[0007] 2. The measurement process usually affects the normal operation of the atomic fountain frequency standard;
[0008] 3. For multiple noise sensitivity coefficients, multiple measurement experiments are required to realize, the workload is heavy and the work efficiency is low
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Embodiment
[0041] This embodiment provides a method for measuring noise sensitivity coefficient based on noise correlation.
[0042] The design principle of the measurement method is:
[0043] In the case of any precision measuring device running for a long time, the output signal will be affected by various noise effects. The noise itself is uncertain, but the effect of noise on the signal output is definite. This certainty can be accentuated by increasing the magnitude of the noise. The measurement method provided in this embodiment is to extract the influence of noise on the signal based on a large amount of data by increasing the number of samples.
[0044] Within an integration time τ, the measurement device error is expressed as:
[0045]
[0046] Among them, y 0，j (τ) represents the error y caused by the performance of the measuring device itself 0 (t) the integral average of the τ time interval from (j-1)τ to jτ; x i，j represents the noise x i Integral average over tes...
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The present invention provides a noise sensitivity coefficient measurement method based on noise correlation. The method comprises the following steps: an error sequence {y<j>} of signal output and one or more environmental noise sequences {x<i,j>} are synchronously recorded and mathematically calculated; and a real sensitivity coefficient of y to x can be expressed as a calculated value of K<x> on the basis of a large amount of data accumulation. A phase difference of the recorded data is corrected. There may be a phase difference between x<i,j> and y<j> in the data recording process, which is expressed that the value of K<x> is different for a different integration time tau. The curve of K<x>(tau) is drawn; the phase difference information in the K<x>(tau) curve is extracted; an existing phase difference is calculated; and the phase difference is corrected to obtain the K<x> meeting the accuracy requirement. The method is to directly solve the environmental noise sensitivity coefficient based on the noise statistical correlation, and can evaluate the type B uncertainty more quickly and effectively.
Description
technical field [0001] The present invention relates to the technical field of precision measurement, in particular to a method for measuring noise sensitivity coefficient based on noise correlation, which is used to measure the contribution of environmental noise to the uncertainty of signal output in the process of precision measurement, and can be performed in parallel in real time Computes the sensitivity coefficient of the output signal of the precision measurement with respect to various environmental noises. Background technique [0002] When precision measurement devices such as atomic frequency standards are in operation, the long-term stability of the output signal is affected by various environmental noises. The average value of noise causes offset, and the fluctuation of noise and test error affect the uncertainty of the signal. When evaluating the performance index of a precision measurement device, it is necessary to measure and evaluate various noises that aff...
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IPC IPC(8): G01R29/08
CPCG01R29/0892
Inventor 魏荣王倩张宁
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI