Abstract
Abstract The paper discusses the ultrasonic wave reflection at the interface between a 1–3 type composite transducer and water. It is shown that, because of the non-uniform ultrasonic displacement on the surface of the transducer, the reflection coefficient becomes a complex number and is not simply determined only by the acoustic impedance of the two materials. From the result, an equivalent circuit has been derived for the interface. The behaviour of the interface is substantially characterised by a parallel capacitance inserted between the two transmission lines representing the composite transducer and water.
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