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Proceedings Paper

Response of FBG sensors to Lamb wave propagation and its application to active sensing
Author(s): Hiroshi Tsuda
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Paper 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.

Paper Details

Date Published: 19 May 2005
PDF: 8 pages
Proc. SPIE 5767, Nondestructive Evaluation and Health Monitoring of Aerospace Materials, Composites, and Civil Infrastructure IV, (19 May 2005); doi: 10.1117/12.598993
Show Author Affiliations
Hiroshi Tsuda, National Institute of Advanced Industrial Science and Technology (Japan)


Published in SPIE Proceedings Vol. 5767:
Nondestructive Evaluation and Health Monitoring of Aerospace Materials, Composites, and Civil Infrastructure IV
Peter J. Shull; Andrew L. Gyekenyesi; Aftab A. Mufti, Editor(s)

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