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Proceedings Paper

A high-speed and high-precision phase-shift demodulation algorithm for optical fiber sensing system based on low-coherence interference
Author(s): Shaohua Wang; Junfeng Jiang; Tiegen Liu; Kun Liu; Jinde Yin; Xiange Meng; Shuang Wang; Zunqi Qin; Yimo Zhang
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Paper 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.

Paper Details

Date Published: 7 November 2012
PDF: 4 pages
Proc. SPIE 8421, OFS2012 22nd International Conference on Optical Fiber Sensors, 842185 (7 November 2012);
Show Author Affiliations
Shaohua Wang, Tianjin Univ. (China)
Junfeng Jiang, Tianjin Univ. (China)
Tiegen Liu, Tianjin Univ. (China)
Kun Liu, Tianjin Univ. (China)
Jinde Yin, Tianjin Univ. (China)
Xiange Meng, Tianjin Univ. (China)
Shuang Wang, Tianjin Univ. (China)
Zunqi Qin, Tianjin Univ. (China)
Yimo Zhang, Tianjin Univ. (China)

Published in SPIE Proceedings Vol. 8421:
OFS2012 22nd International Conference on Optical Fiber Sensors
Yanbiao Liao; Wei Jin; David D. Sampson; Ryozo Yamauchi; Youngjoo Chung; Kentaro Nakamura; Yunjiang Rao, Editor(s)

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