Contactless ultrasonic device to measure surface acoustic wave velocities versus temperature.
A complete optical experimental setup for generating and detecting surface acoustic waves [Rayleigh waves (RWs)] in metals versus temperature up to the melting point is described. The RWs were excited by a pulsed Nd:YAG laser and detected by a high sensitivity subangstrom heterodyne interferometer. A special furnace was used to heat the sample using infrared radiation with a regulation of the sample temperature less than 0.1 K. First measurements on an aluminum alloy sample are presented to validate the setup.
Hubert
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Department de Recherches sur les Matériaux Nucléaires, Centre de Valduc, Commissariat a l'Energie Atomique, F-21120 Is-sur-Tille, France.
Nadal
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Ravel-Chapuis
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Oltra
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