A Phase Subdivision Method Based on Wavelet Transform

A wavelet transform and phase technology, applied in the field of signal processing, can solve problems such as complex structure, excessive error, and subdivision multiple limit, and achieve the effects of strong anti-interference ability, lower sampling frequency, and higher frequency

Active Publication Date: 2021-02-19
GUILIN UNIV OF ELECTRONIC TECH
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The general subdivision method has been unable to meet higher requirements due to the limitation of subdivision multiples, excessive error and complex structure.

Method used

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  • A Phase Subdivision Method Based on Wavelet Transform
  • A Phase Subdivision Method Based on Wavelet Transform
  • A Phase Subdivision Method Based on Wavelet Transform

Examples

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Embodiment Construction

[0025] The present invention will be described in detail below in conjunction with accompanying drawing and specific embodiment:

[0026] Such as figure 1 Shown, a kind of phase subdivision method based on wavelet transform of the present invention comprises:

[0027] converting the optical interference signal formed by the moving grating and the fixed grating into an electrical signal, and sampling the electrical signal to obtain sampling data;

[0028] Carrying out wavelet transform to the sampled data to obtain the instantaneous frequency of each sampling point, and fitting each segment of the sampling points to obtain the first frequency curve;

[0029] Determining the intermediate frequency between adjacent two ends in the first frequency curve, and fitting the intermediate frequency points between each two ends to obtain an optimized frequency curve, and the sampling points between the two end points are distributed according to the fitted frequency curve;

[0030] Per...

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Abstract

The invention discloses a phase subdivision method based on wavelet transform, which includes converting the optical interference signal formed by a moving grating and a fixed grating into an electrical signal, and sampling the electrical signal to obtain sampling data; Perform wavelet transform to obtain the instantaneous frequency of each sampling point, fit each segment of sampling points and obtain the first frequency curve; determine the intermediate frequency between adjacent two points in the first frequency curve, and convert the Fit the intermediate frequency points to obtain the optimized frequency curve, and the sampling points between the two ends are distributed according to the fitted frequency curve; perform error detection on the optimized frequency curve to obtain the optimal frequency of the sampling point; calculate the elapsed time Δt from time t Afterwards, for the instantaneous frequency f(t+Δt) at the time point, suppose that the phase obtained after the time interval Δt is 2π / n, and count N while calculating the time interval Δt; calculate the motion of the moving grating according to the motion relationship distance.

Description

technical field [0001] The invention relates to the technical field of signal processing, in particular to a phase subdivision method based on wavelet transform. Background technique [0002] With the rapid development of science and technology, various industries have higher and higher requirements for high-precision measurement technology, especially for industries involving nanotechnology, MEMS (micro-electromechanical system) technology and aerospace technology, the requirements for high-precision measurement technology It's even higher. [0003] Due to the higher requirements for signal accuracy, if there is no way to improve the accuracy of the measuring instrument, it is necessary to further process and subdivide the measured signal. The general subdivision method can no longer meet the higher requirements due to the limitation of subdivision multiples, excessive error and complex structure. The current electronic subdivision methods are roughly divided into two typ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/02
Inventor 张文涛张紫杨熊显名杜浩徐韶华张玉婷
Owner GUILIN UNIV OF ELECTRONIC TECH
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