A piezoelectric film hydrophone with adjustable sensitivity
Wang Guang-can · Applied Acoustics · 2003
This paper presents a piezoelectric film hydrophone with adjustable sensitivity. It uses PVDF film as a sensing material, which is pasted inside the wall of a cylinder made of a flexible organic material. When sound pressure is applied to the flexible cylinder, the PVDF transfers the sound pressure to electric charge. There is a preamplifier in the hydrophone. The sensitivity of the hydrophone can be controlled by adjusting a loadresistance in the preamplifier, the range of adjustable sensitivity is -190 dB——175 dB(re 1 V/μPa), and the frequency response is 100 Hz - 16kHz.