Method for improving precision and frequency band of white light interference phase demodulation system

By using spectral compensation and inverse Fourier transform, the problems of demodulation distortion and bandwidth limitation in white light interferometric phase demodulation systems were solved, thereby improving system accuracy and bandwidth, reducing costs, and simplifying the optical path structure.

CN119268744BActive Publication Date: 2026-07-21ANHUI UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ANHUI UNIV
Filing Date
2024-11-20
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

The white light interferometric phase demodulation system suffers from demodulation distortion and bandwidth limitation, which restricts the system's operating bandwidth and fails to meet the requirements for high sensitivity and high resolution.

Method used

The white light interferometric phase demodulation system is compensated using the compensation coefficient CF through spectral compensation and inverse Fourier transform. This includes theoretical analysis, elliptic fitting demodulation, and integral operation. The delay τ is calculated, compensation coefficients are generated, and frequency-by-frequency compensation is applied to the system to eliminate the distortion caused by the delay.

Benefits of technology

It effectively eliminates distortion caused by delay, expands the system's operating bandwidth, improves demodulation accuracy and bandwidth, reduces system cost, and simplifies the optical path structure.

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Abstract

The application discloses a method for improving the precision and frequency band of a white light interference phase demodulation system, and belongs to the technical field of optical fiber sensing. The method comprises the following steps: theoretically analyzing the ratio of the demodulation result of the white light interference phase demodulation system to the real value and taking the ratio as a compensation coefficient (CF); the CF is a quantity related to the frequency of the to-be-detected signal and the time delay; a group of cyclic counts are generated to compensate the CF in the frequency spectrum demodulated by the white light interference phase demodulation system; and inverse Fourier transform is used to recover the compensated time domain signal from the compensated signal spectrum. The application expands the working frequency band of the system while reducing the distortion degree of the white light interference, and makes the white light interference more suitable for the sensing field.
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