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Ultrasonic Lamb wave mode conversion to optical fiber guided mode with varying input conditions
Author(s): Junghyun Wee; Drew Hackney; Kara Peters
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Paper Abstract

In structural health monitoring (SHM) applications, one of the advantages of utilizing a surface bonded fiber Bragg grating (FBG) sensor for damage detection is its increased sensitivity in collecting ultrasonic waves. Recent studies have demonstrated that for a certain bonding condition the output FBG response can be increased by bonding the optical fiber at a distance away from the FBG to collect optical fiber guided wave (L01 mode) that is converted from S0 Lamb wave, referred as remote bonding. However in order to apply the remote bonding configuration in practical situations, the S0 mode conversion to L01 mode through an adhesive bond under various conditions must be characterized. This work investigates how the coupled L01 mode changes with varying input S0 mode frequency and angle of incidence through an adhesive bond. The goal of this work is to better understand the S0 mode conversion to the L01 mode in order to implement the remote bonding configuration for an improved SHM of a structure.

Paper Details

Date Published: 27 March 2019
PDF: 6 pages
Proc. SPIE 10970, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2019, 1097008 (27 March 2019); doi: 10.1117/12.2514057
Show Author Affiliations
Junghyun Wee, North Carolina State Univ. (United States)
Drew Hackney, North Carolina State Univ. (United States)
Kara Peters, North Carolina State Univ. (United States)


Published in SPIE Proceedings Vol. 10970:
Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2019
Jerome P. Lynch; Haiying Huang; Hoon Sohn; Kon-Well Wang, Editor(s)

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