ABSTRACT A new type of PVDF hydrophone, the multilayer planar PVDF hydrophone, is described in this paper. The hydrophone disturbs measured acoustic fields very little and has a high sensitivity. The noise-equivalent pressure of the hydrophone is 45 dB re 1 µ Pa per Hz bandwidth. The working frequency range of the hydrophone is 20 kHz ~ 4 MHz. In the range 100 kHz ~ 1 MHz, the hydrophone has a flat frequency response with sensitivity -205 dB ± 1.5 dB (0 dB = 1 V/µPa). In this range, the hydrophone has been used for five years as a standard one. Two other applications (measurements of noise spectra and ultrasonic imaging) are also reported.
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