Journal
NDT & E INTERNATIONAL
Volume 59, Issue -, Pages 1-10Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ndteint.2013.04.003
Keywords
Nondestructive testing; Ultrasonic guided waves; Laser-generated ultrasound; Image processing
Funding
- Laboratory Directed Research and Development Program at Los Alamos National Laboratory [LA-UR-12-24768]
- Leading Foreign Research Institute Recruitment Program through the National Research Foundation of Korea
- Ministry of Education, Science and Technology [2011-0030065]
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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. (C) 2013 Elsevier Ltd. All rights reserved.
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