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Optical Engineering

Strain fiber sensor based on beat frequency with chirped fiber Bragg grating
Author(s): Xu Wang; Haojie Zhang; Quan Wen; Longfei Chen; Fang Wang; Yufang Liu; Kun Yu
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Paper Abstract

We propose a strain fiber sensor that is interrogated via longitudinal mode beat frequency with a linear chirped fiber Bragg grating (CFBG). Unlike conventional sensors, in the proposed sensor, the CFBG is used to convert wavelength changes into resonant cavity length changes. Further, the beat frequency stability of the fiber laser is fully utilized to significantly improve measurement accuracy. Consequently, because cavity changes account for 5.1% of the total cavity length, the measurement accuracy can be as large as 7.06×10−7ϵ—i.e., approximately five times greater than the accuracy obtained by stretching the resonant cavity fiber. The maximum experimental strain error range is ±14.5  μϵ.

Paper Details

Date Published: 18 July 2016
PDF: 4 pages
Opt. Eng. 55(7) 076106 doi: 10.1117/1.OE.55.7.076106
Published in: Optical Engineering Volume 55, Issue 7
Show Author Affiliations
Xu Wang, Henan Normal Univ. (China)
Haojie Zhang, Henan Normal Univ. (China)
Quan Wen, Henan Normal Univ. (China)
Longfei Chen, Henan Normal Univ. (China)
Fang Wang, Henan Normal Univ. (China)
Yufang Liu, Henan Normal Univ. (China)
Kun Yu, Henan Normal Univ. (China)

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