Delamination detection in composite structures using laser vibrometer measurement of Lamb waves

Hoon Sohn; Eric D. Swenson; Steven E. Olson; Martin P. DeSimio; Debaditya Dutta

doi:10.1117/12.847316

8 April 2010 Delamination detection in composite structures using laser vibrometer measurement of Lamb waves

Hoon Sohn, Eric D. Swenson, Steven E. Olson, Martin P. DeSimio, Debaditya Dutta

Proceedings Volume 7650, Health Monitoring of Structural and Biological Systems 2010; 76500P (2010) https://doi.org/10.1117/12.847316
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2010, San Diego, California, United States

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.

Citation Download Citation

Hoon Sohn, Eric D. Swenson, Steven E. Olson, Martin P. DeSimio, and Debaditya Dutta "Delamination detection in composite structures using laser vibrometer measurement of Lamb waves", Proc. SPIE 7650, Health Monitoring of Structural and Biological Systems 2010, 76500P (8 April 2010); https://doi.org/10.1117/12.847316

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