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Proceedings Paper

Optical measurements of Leaky-Rayleigh waves in air
Author(s): Laszlo Adler; Michel de Billy; Christophe Mattei; Gerard J. Quentin
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Paper Abstract

Due to the difficulties associated with ultrasonic generation and detection in air in the megaHertz region, air-coupled nondestructive evaluation has only recently been explored. In this work, a shear transducer is mounted directly over the edge of a solid specimen so that it can generate a bulk mode in the interior of the solid as well as a Rayleigh wave along the surface. A recently developed optical heterodyne interferometer proved to be sensitive to the leaky-Rayleigh wave in air more than a centimeter away from the solid surface. Results of velocity and attenuation measurement of leaky-Rayleigh waves for several solids will be presented. The technique can also be applied to pates to measure leaky-Lamb velocity and attenuation in air. This method can be used for low optical reflectivity solid surfaces: thus it can be extended for non-contact nondestructive evaluation applications.

Paper Details

Date Published: 11 November 1998
PDF: 8 pages
Proc. SPIE 3581, Acousto-Optics and Applications III, (11 November 1998); doi: 10.1117/12.330469
Show Author Affiliations
Laszlo Adler, Adler Consultants, Inc. (United States)
Michel de Billy, Paris VI and VII (France)
Christophe Mattei, Adler Consultants, Inc. (United States)
Gerard J. Quentin, Univ. de Paris VI and VII (France)

Published in SPIE Proceedings Vol. 3581:
Acousto-Optics and Applications III
Antoni Sliwinski; Bogumil B. J. Linde; Piotr Kwiek, Editor(s)

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