Structural imaging through local wavenumber estimation of guided waves

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This paper describes a method to effectively image structural features and defects using local estimates of the wavenumber of propagating guided Lamb waves at a fine grid of spatial sampling points. The guided waves are rapidly excited at each grid point using a scanning Q-switched laser system and sensed by a single fixed ultrasonic transducer. Through reciprocity, this produces a full-wave-field time history of a virtual wave being excited from the transducer. Using frequency wavenumber processing, localized wavelength estimates are obtained by isolating each wave mode, narrowband filtering to one or more high-energy frequency bands, and identifying the center-wavelength of a sliding wavenumber band-pass filter that maximizes the energy at each grid point. The approach was capable of producing detailed images of hidden wall-thinning in an aluminum plate and a steel pipe section and local impact delamination in a complicated composite component.
Publisher
ELSEVIER SCI LTD
Issue Date
2013-10
Language
English
Article Type
Article
Keywords

SCANNING LASER VIBROMETRY; VISUALIZATION; ULTRASOUND

Citation

NDT & E INTERNATIONAL, v.59, pp.1 - 10

ISSN
0963-8695
DOI
10.1016/j.ndteint.2013.04.003
URI
http://hdl.handle.net/10203/202816
Appears in Collection
AE-Journal Papers(저널논문)
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