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Laser ultrasonic inspection of plates using zero-group velocity lamb modes.
IEEE Trans Ultrason Ferroelectr Freq Control
May 2010
Laboratoire Ondes et Acoustique, Ecole Superieure de Physique et de Chimie Industrielles (ESPCI)-Universite, Paris 7, CNRS UMR 7587, Paris, France.
A noncontact laser-based ultrasonic technique is proposed for detecting small plate thickness variations caused by corrosion and adhesive disbond between two plates. The method exploits the resonance at the minimum frequency of the S(1) Lamb mode dispersion curve. At this minimum frequency, the group velocity vanishes, whereas the phase velocity remains finite.
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