Optical measurements of Leaky-Rayleigh waves in air

Laszlo Adler; Michel de Billy; Christophe Mattei; Gerard J. Quentin

doi:10.1117/12.330469

11 November 1998 Optical measurements of Leaky-Rayleigh waves in air

Laszlo Adler, Michel de Billy, Christophe Mattei, Gerard J. Quentin

Proceedings Volume 3581, Acousto-Optics and Applications III; (1998) https://doi.org/10.1117/12.330469
Event: Acousto-Optics and Applications III, 1998, Gdansk-Jurata, Poland

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.

Citation Download Citation

Laszlo Adler, Michel de Billy, Christophe Mattei, and Gerard J. Quentin "Optical measurements of Leaky-Rayleigh waves in air", Proc. SPIE 3581, Acousto-Optics and Applications III, (11 November 1998); https://doi.org/10.1117/12.330469

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