Automated detection of delamination and disbond from wavefield images obtained using a scanning laser vibrometer

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The paper presents signal and image processing algorithms to automatically detect delamination and disbond in composite plates from wavefield images obtained using a scanning laser Doppler vibrometer (LDV). Lamb waves are excited by a lead zirconate titanate transducer (PZT) mounted on the surface of a composite plate, and the out-of-plane velocity field is measured using an LDV. From the scanned time signals, wavefield images are constructed and processed to study the interaction of Lamb waves with hidden delaminations and disbonds. In particular, the frequency-wavenumber (f-k) domain filter and the Laplacian image filter are used to enhance the visibility of defects in the scanned images. Thereafter, a statistical cluster detection algorithm is used to identify the defect location and distinguish damaged specimens from undamaged ones.
Publisher
IOP PUBLISHING LTD
Issue Date
2011-04
Language
English
Article Type
Article
Citation

SMART MATERIALS STRUCTURES, v.20, no.4

ISSN
0964-1726
DOI
10.1088/0964-1726/20/4/045017
URI
http://hdl.handle.net/10203/96603
Appears in Collection
CE-Journal Papers(저널논문)
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