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Multilongitudinal mode fiber-ring laser sensor for strain measurement.

Authors :
Liu, Shengchun
Gu, Rong
Gao, Liang
Yin, Zuowei
Zhang, Liang
Chen, Xiangfei
Chen, Jianchun
Source :
Optical Engineering; May2011, Vol. 50 Issue 5, p054401, 1p
Publication Year :
2011

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. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00913286
Volume :
50
Issue :
5
Database :
Complementary Index
Journal :
Optical Engineering
Publication Type :
Academic Journal
Accession number :
74577135
Full Text :
https://doi.org/10.1117/1.3574376