Degradation of sensing properties of fiber Bragg grating strain sensors in fatigue process of bonding layers

Wei Zhang; Weimin Chen; Yuejie Shu; Jun Wu; Xiaohua Lei

doi:10.1117/1.OE.53.4.046102

3 April 2014 Degradation of sensing properties of fiber Bragg grating strain sensors in fatigue process of bonding layers

Wei Zhang, Weimin Chen, Yuejie Shu, Jun Wu, Xiaohua Lei

Author Affiliations +

Optical Engineering, Vol. 53, Issue 4, 046102 (April 2014). https://doi.org/10.1117/1.OE.53.4.046102

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.

Citation Download Citation

Wei Zhang, Weimin Chen, Yuejie Shu, Jun Wu, and Xiaohua Lei "Degradation of sensing properties of fiber Bragg grating strain sensors in fatigue process of bonding layers," Optical Engineering 53(4), 046102 (3 April 2014). https://doi.org/10.1117/1.OE.53.4.046102

Published: 3 April 2014

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