Mechanisms of signal coupling  to optical  fiber  for  FBG sensor  detection of Lamb waves

Junghyun Wee; Drew Hackney; Philip Bradford; Kara Peters

doi:10.1117/12.2263278

23 April 2017 Mechanisms of signal coupling to optical fiber for FBG sensor detection of Lamb waves

Junghyun Wee, Drew Hackney, Philip Bradford, Kara Peters

Proceedings Volume 10323, 25th International Conference on Optical Fiber Sensors; 103230E (2017) https://doi.org/10.1117/12.2263278
Event: 25th International Conference on Optical Fiber Sensors, 2017, Jeju, Korea, Republic of

Abstract

One of the major challenges when using fiber Bragg grating sensors (FBGs) to detect Lamb wave or acoustic emission signals in structures is the low sensitivity of these sensors to surface waves propagating in the structure. The authors have previously demonstrated that remote bonding of the optical fiber away from the FBG can increase the measured signal amplitude. In this paper we investigate the potential mechanisms for this increase through finite element simulations and demonstrate that the shear lag effect through the adhesive is the major source of the signal amplitude difference between the direct and remote bonding cases.

Citation Download Citation

Junghyun Wee, Drew Hackney, Philip Bradford, and Kara Peters "Mechanisms of signal coupling to optical fiber for FBG sensor detection of Lamb waves", Proc. SPIE 10323, 25th International Conference on Optical Fiber Sensors, 103230E (23 April 2017); https://doi.org/10.1117/12.2263278

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