Ultrasonic Lamb wave mode conversion to optical fiber guided mode with varying input conditions

Junghyun Wee; Drew Hackney; Kara Peters

doi:10.1117/12.2514057

27 March 2019 Ultrasonic Lamb wave mode conversion to optical fiber guided mode with varying input conditions

Junghyun Wee, Drew Hackney, Kara Peters

Proceedings Volume 10970, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2019; 1097008 (2019) https://doi.org/10.1117/12.2514057
Event: SPIE Smart Structures + Nondestructive Evaluation, 2019, Denver, Colorado, United States

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.

Conference Presentation

Citation Download Citation

Junghyun Wee, Drew Hackney, and Kara Peters "Ultrasonic Lamb wave mode conversion to optical fiber guided mode with varying input conditions ", Proc. SPIE 10970, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2019, 1097008 (27 March 2019); https://doi.org/10.1117/12.2514057

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