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Optical Sensors

Multilongitudinal mode fiber-ring laser sensor for strain measurement

[+] Author Affiliations
Shengchun Liu

Nanjing University, National Laboratoy of Microstructure, Nanjing 210093, China and Heilongjiang University, Institute of Fiber Optics, Harbin 150080, China and Nanjing University, The Laboratory of Modern Acoustics and Institute of Acoustics, Nanjing 210093, China

Rong Gu, Liang Gao, Zuowei Yin, Liang Zhang, Xiangfei Chen

Nanjing University, National Labortaory of Microstructure, Nanjing 210093, China

Jianchun Cheng

Nanjing University, The Laboratory of Modern Acoustics and Institute of Acoustics, Nanjing 210093, China

Opt. Eng. 50(5), 054401 (May 03, 2011). doi:10.1117/1.3574376
History: Received November 23, 2010; Revised February 27, 2011; Accepted March 07, 2011; Published May 03, 2011; Online May 03, 2011
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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.

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© 2011 Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation

Shengchun Liu ; Rong Gu ; Liang Gao ; Zuowei Yin ; Liang Zhang, et al.
"Multilongitudinal mode fiber-ring laser sensor for strain measurement", Opt. Eng. 50(5), 054401 (May 03, 2011). ; http://dx.doi.org/10.1117/1.3574376


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