Open Access Open Access  Restricted Access Subscription or Fee Access

Increased Lamb Wave Detection Sensitivity of Surface Bonded Fiber Bragg Gratings through Bonding Optimization

JUNGHYUN WEE, DREW HACKNEY, PHILIP BRADFORD, KARA PETERS

Abstract


Current adhesive bonding approaches for fiber Bragg grating (FBG) sensor networks to detect Lamb waves and acoustic emission (AE) signals in naval structures follow the same guidelines as for quasi-static strain detection. These bonding strategies favor thin, stiff adhesives to maximize the quasi-static displacement coupling between the optical fiber and substructure. However, in this paper, we demonstrate that following the bonding design guidelines typically applied to piezoelectric (PZT) transducers for Lamb wave and AE signal detection can significantly increase the output signal amplitudes of FBG sensors to these waves. Simulations of the wave propagation through various adhesive bond conditions provide validation of the observed behaviors.


DOI
10.12783/shm2017/13988

Full Text:

PDF

Refbacks

  • There are currently no refbacks.