Characteristics of a PVDF Membrane Hydrophone for Use in the Range 1-100 MHz

Abstrocr-The experimental determination of the frequency response, directionality, and electrical characteristics of membrane hydrophones are reported. These characteristics are interpreted in terms of theoretical models, based mainly on published values for the properties of polyvinylidene fluoride (pvdf). The frequency response was determined using both linear and nonlinear acoustic fields. The directionality is affected by the angular variation of piezoelectric sensitivity and also, for large angles of incidence, by Lamb wave propagation in the membrane. The hydrophones are shown to be useful experimental devices both for studying acoustic waves in the frequency range 1-100 MHz and for investigating the properties of pvdf. They are well-suited to the study of nonlinear ultrasonic fields, and those used in medicine and nondestructive testing.

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