Measurement of Elastic Anisotropy of Solid Using an Interdigital Transducer for Underwater Ultrasonic Wave Excitation

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Abstract
One interdigital transducer couple (IDTs) on a piezoelectric substrate has been used to investigate the acoustic properties of anisotropic materials. An IDT can radiate underwater ultrasonic wave in oblique directions with respect to the substrate surface. When the acoustic beam is incident on the solid sample-water interface near the Rayleigh angle, the reflection field is equal to the superposed fields of the specular reflection and the reradiation from the leaky SAW excited on the sample. The velocity and the attenuation of the leaky SAW on the sample can be obtained from the measured trailing field due to the reradiation.

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