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Optical Engineering

Degradation of sensing properties of fiber Bragg grating strain sensors in fatigue process of bonding layers
Author(s): Wei Zhang; Weimin Chen; Yuejie Shu; Jun Wu; Xiaohua Lei
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Paper Abstract

Bonding layers, serving as the strain transmission mediums, may bring undesirable effects to the sensing properties of fiber Bragg grating (FBG) strain sensors during their fatigue process. To analyze the strain sensitivity and the reflected spectrum of FBG strain sensors in different fatigue stages of bonding layers, their strain sensitivities were derived according to strain transfer models. Resorting to T-matrix formalism, the affected reflected spectra were stimulated. Theoretical analysis results show that there is a gradual decline in the strain sensitivity during the stage of fatigue crack initiation, and that significant distortions emerge in the reflected spectrum during the stage of fatigue crack propagation. In addition, a cyclic loading fatigue test was conducted and the phenomenon observed in the test showed a good agreement with the theoretical prediction.

Paper Details

Date Published: 3 April 2014
PDF: 8 pages
Opt. Eng. 53(4) 046102 doi: 10.1117/1.OE.53.4.046102
Published in: Optical Engineering Volume 53, Issue 4
Show Author Affiliations
Wei Zhang, Chongqing Univ. (China)
Weimin Chen, Chongqing Univ. (China)
Yuejie Shu, Chongqing Univ. (China)
Jun Wu, Chongqing Univ. (China)
Xiaohua Lei, Chongqing Univ. (China)

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