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Anisotropy in velocity and attenuation of leaky surface-acoustic waves (leaky SAWs) on hot-pressed silicon nitride was measured by acoustic microscopy using the line-focus beam. On the surface normal to the pressing direction the velocity was 5651 m/s for all propagation directions, whereas on the surface parallel to the pressing direction the velocities varied markedly, depending on the wave propagation...
A new method of direct attenuation measurement of leaky waves is proposed through V(z) curves obtained by the line-focus-beam acoustic microscope, simultaneously giving the corresponding wave velocity. Experiments are demonstrated for fused quartz with an acoustic line-focus-beam sapphire lens of 1.0 mm radius at 226.3 MHz. The attenuation measurement is achieved with a sufficient accuracy of about...
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