Abstract
The methods of measuring the acoustic properties of solids by using the acoustic beams from interdigital transducers (IDT) is described. An IDT can radiate acoustic waves into liquid in oblique directions with respect to the substrate surface, and the wave fronts can be arbitrarly controlled by designing the IDT shape. One IDT couple is used to measure the acoustic properties of a solid sample. In the present study, we show a new method for focusing the beam from an IDT and measuring the acoustic properties of solids. An interdigital electrode is divided into several sections, each of which is placed to form a one dimensional Fresnel phase plate (FPP) on a piezoelectric substrate. It has been found that the FPP IDT generates a converging beam onto a focal plane, and the present system is suitable for measuring the two dimensional variation of leaky SAW phase velocity on a sample surface.
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