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Optical Engineering

Multilongitudinal mode fiber-ring laser sensor for strain measurement
Author(s): Shengchun Liu; Rong Gu; Liang Gao; Zuowei Yin; Liang Zhang; Xiangfei Chen; Jianchun Chen
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Paper Abstract

A multilongitudinal mode fiber ring laser sensor is proposed and experimentally demonstrated by measuring the strain applied on the laser sensor head. The ring cavity of the laser is formed by a 3-dB coupler, a section of erbium-doped fiber, and one fiber Bragg grating. Photonic generation of beat signals and strain measurement theory are discussed in detail. The strain applied on the fiber ring cavity is obtained by measuring the beat frequency shift. The selection way of the optimal beat signal for strain measurement is obtained by experimental research and discussion. The root-mean-square deviation of the strain and the response of beat frequency to the strain are 2.7 μɛ and 1.5 kHz/μɛ at 1993 MHz, respectively. The proposed sensor scheme offers a cost-effective and high-stability device for strain measurement.

Paper Details

Date Published: 1 May 2011
PDF: 6 pages
Opt. Eng. 50(5) 054401 doi: 10.1117/1.3574376
Published in: Optical Engineering Volume 50, Issue 5
Show Author Affiliations
Shengchun Liu, Nanjing Univ. (China)
Rong Gu, Nanjing Univ. (China)
Liang Gao, Nanjing Univ. (China)
Zuowei Yin, Nanjing Univ. (China)
Liang Zhang, Nanjing Univ. (China)
Xiangfei Chen, Nanjing Univ. (China)
Jianchun Chen, Nanjing Univ. (China)

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