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Proceedings Paper

Distributed feedback fiber laser strain sensor with high sensitivity in a wide frequency range
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Paper Abstract

A compact high-sensitivity distributed feedback (DFB) fiber laser strain sensor with length of only 56 mm is investigated. The intrinsic performances including optical efficiency and acoustic sensing characteristics of bare DFB fiber laser are tested before packaging. Then polyurethane cylinder and spindle structures are applied for fiber laser packaging. By use of a Mach-Zehnder interferometer and a standard optical phase demodulator, the frequency response of DFB fiber laser before and after packaging is tested in a vibration liquid sound field and compared to standard PZT hydrophone. The experimental results show that the prestress on bare fiber laser affects the frequency response rather than strain sensitivity; the frequency sensitivity of spindle structure packaged DFB fiber laser hydrophone is about 113dB•re•Hz•Pa-1 at 1 kHz, which is 55 dB higher than bare fiber laser under the same prestress. It is remarkable that in a quite wide frequency range from 10 Hz to 10 kHz, it has a more flat frequency response with about ±8 dB fluctuation than that of cylinder structure packaged DFB FL.

Paper Details

Date Published: 30 November 2012
PDF: 5 pages
Proc. SPIE 8561, Advanced Sensor Systems and Applications V, 85611I (30 November 2012); doi: 10.1117/12.1000151
Show Author Affiliations
Xiaolei Zhang, Shandong Academy of Sciences (China)
Gangding Peng, The Univ. of New South Wales (Australia)
Chang Wang, Shandong Academy of Sciences (China)
Zhihui Sun, Shandong Academy of Sciences (China)
Jiasheng Ni, Shandong Academy of Sciences (China)
Yingying Wang, Shandong Academy of Sciences (China)

Published in SPIE Proceedings Vol. 8561:
Advanced Sensor Systems and Applications V
Brian Culshaw; Yanbiao Liao; Anbo Wang; Xiaoyi Bao; Xudong Fan, Editor(s)

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