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Proceedings Paper

Delamination detection in composite structures using laser vibrometer measurement of Lamb waves
Author(s): Hoon Sohn; Eric D. Swenson; Steven E. Olson; Martin P. DeSimio; Debaditya Dutta
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Paper Abstract

In this study, the feasibility of using a scanning laser vibrometer for detecting hidden delamination in multi-layer composites is explored. First, Lamb waves are excited by Lead Zirconate Titanate (PZT) transducers mounted on the surface of a composite plate, and the out-of-plane ultrasonic velocity field is measured using a 1D scanning laser vibrometer. From the scanned time signals, wave field images are constructed and processed to study the interaction of Lamb waves with hidden delamination. In order to highlight the defect area in the image, the performance of different image processing tools were investigated. In particular, the Laplacian image filter was found to accentuate the visual indications of the ultrasound-defect interaction by suppressing the presence of incident waves in the wave field images. The performance of the proposed scheme is investigated using experimental data collected from a 1.8 mm thick multilayer composite plate and a 10 mm thick composite wing structure.

Paper Details

Date Published: 8 April 2010
PDF: 10 pages
Proc. SPIE 7650, Health Monitoring of Structural and Biological Systems 2010, 76500P (8 April 2010); doi: 10.1117/12.847316
Show Author Affiliations
Hoon Sohn, KAIST (Korea, Republic of)
Eric D. Swenson, Air Force Institute of Technology (United States)
Steven E. Olson, Univ. of Dayton Research Institute (United States)
Martin P. DeSimio, Univ. of Dayton Research Institute (United States)
Debaditya Dutta, Carnegie Mellon Univ. (United States)

Published in SPIE Proceedings Vol. 7650:
Health Monitoring of Structural and Biological Systems 2010
Tribikram Kundu, Editor(s)

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