A high-speed and high-precision phase-shift demodulation algorithm for optical fiber sensing system based on low-coherence interference

Shaohua Wang; Junfeng Jiang; Tiegen Liu; Kun Liu; Jinde Yin; Xiange Meng; Shuang Wang; Zunqi Qin; Yimo Zhang

doi:10.1117/12.975214

7 November 2012 A high-speed and high-precision phase-shift demodulation algorithm for optical fiber sensing system based on low-coherence interference

Shaohua Wang, Junfeng Jiang, Tiegen Liu, Kun Liu, Jinde Yin, Xiange Meng, Shuang Wang, Zunqi Qin, Yimo Zhang

Author Affiliations +

Proceedings Volume 8421, OFS2012 22nd International Conference on Optical Fiber Sensors; 842185 (2012) https://doi.org/10.1117/12.975214
Event: OFS2012 22nd International Conference on Optical Fiber Sensor, 2012, Beijing, China

Abstract

A novel demodulation algorithm, comprising of a calibration algorithm and improved linear fitting phase-shift algorithm, is proposed for optical fiber sensing system based on low-coherence interference. The calibration algorithm is used to identify the fringe order. Traditional phase-shift algorithm is improved to get the linear fitting curve of the relative phase corresponding to zero-order fringe and the peak position is retrieved from its zero point. Comparing with Fourier based algorithms, the computation of proposed algorithm is small (approximately 25 times faster) while sustains high precision with 2nm maximum error of cavity length. Experiments were carried out to verify the performance.

Citation Download Citation

Shaohua Wang, Junfeng Jiang, Tiegen Liu, Kun Liu, Jinde Yin, Xiange Meng, Shuang Wang, Zunqi Qin, and Yimo Zhang "A high-speed and high-precision phase-shift demodulation algorithm for optical fiber sensing system based on low-coherence interference", Proc. SPIE 8421, OFS2012 22nd International Conference on Optical Fiber Sensors, 842185 (7 November 2012); https://doi.org/10.1117/12.975214

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