Response of FBG sensors to Lamb wave propagation and its application to active sensing

Hiroshi Tsuda

doi:10.1117/12.598993

19 May 2005 Response of FBG sensors to Lamb wave propagation and its application to active sensing

Hiroshi Tsuda

Proceedings Volume 5767, Nondestructive Evaluation and Health Monitoring of Aerospace Materials, Composites, and Civil Infrastructure IV; (2005) https://doi.org/10.1117/12.598993
Event: Nondestructive Evaluation for Health Monitoring and Diagnostics, 2005, San Diego, CA, United States

Abstract

An ultrasonic sensing system in which a fiber Bragg grating was used as an ultrasonic detector was constructed. The system utilizes wavelength-optical intensity modulation technique and includes a broadband light source, fiber Bragg gratings for sensing and filtering, as well as a photodetector. Feasibility of active sensing diagnosis by the system was examined. Ultrasonic Lamb wave generated by a piezoelectric device was propagated in a cross-ply CFRP with visible impact damage. Response of fiber Bragg grating sensor to Lamb wave propagated through damage area was compared with the reference response in intact area. In the active sensing diagnosis, the ultrasonic transmitter was excited by three kinds of signal to determine the optimal transmitter drive signal for impact damage detection. Compared with response in intact area, response to Lamb wave propagated through damage area demonstrated distinctive features. A spike signal proved to be optimal transmitter drive signal for impact damage detection of CFRP.

Citation Download Citation

Hiroshi Tsuda "Response of FBG sensors to Lamb wave propagation and its application to active sensing", Proc. SPIE 5767, Nondestructive Evaluation and Health Monitoring of Aerospace Materials, Composites, and Civil Infrastructure IV, (19 May 2005); https://doi.org/10.1117/12.598993

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