Research on improvement of phase generated carrier demodulation algorithm for fiber optic interferometric sensor

HU Yurun; WANG Muguang; SUN Chunran; ZHANG Jing; BING Fan; CHEN Desheng

doi:10.7510/jgjs.issn.1001-3806.2022.02.011

LASER TECHNOLOGY > 2022 > 46(2): 213-219. > DOI: 10.7510/jgjs.issn.1001-3806.2022.02.011

HU Yurun, WANG Muguang, SUN Chunran, ZHANG Jing, BING Fan, CHEN Desheng. Research on improvement of phase generated carrier demodulation algorithm for fiber optic interferometric sensor[J]. LASER TECHNOLOGY, 2022, 46(2): 213-219. DOI: 10.7510/jgjs.issn.1001-3806.2022.02.011

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Research on improvement of phase generated carrier demodulation algorithm for fiber optic interferometric sensor

1.
Key Laboratory of All-Optical Network and Modern Communication Network of Ministry of Education, Institute of Lightwave Technology, Beijing Jiaotong University, Beijing 100044, China
2.
China North Industries Co. Ltd., Beijing 100053, China
3.
State Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China

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Received Date: March 02, 2021
Revised Date: March 30, 2021
Published Date: March 24, 2022

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Abstract

Abstract

In order to solve the distortion of the demodulated signal caused by the drift of modulation depth in the traditional phase generation carrier demodulation algorithms, the signal demodulation method of differential cross division was adopted. Related theoretical analysis and simulation verification were carried out, and a high-performance phase-generating carrier demodulation scheme that was not limited by the modulation depth was obtained. The results show that the demodulation performance of the improved algorithm is always excellent when the signals under test of different amplitudes and frequencies are used for simulation. When the values of modulation depth are respectively typical values such as 2.63rad and 2.37rad and atypical values such as 1.5rad and 3.0rad, the demodulated signals obtained by improved algorithm has no distortion. At the same time, when the modulation depth changes in the range of 0.5rad~3.5rad, compared with traditional demodulation algorithms, the amplitude of the demodulated signal in the improved algorithm is always consistent with the signal under test and the high-order harmonic components are always very small. This research solves the distortion phenomenon caused by the modulation depth change in traditional demodulation algorithms, and provides a reference for the demodulation scheme of the optical fiber interferometric sensor system.
- sensor technique,
- signal demodulation,
- differential cross division,
- modulation depth

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References (21)

References

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