Comments: pdf
Ref.: OCEANS MTS/IEEE, Hampton Roads (USA), 17-20 October 2022
Abstract:
A piston type projector using the PVDF piezoelectric polymer was developed for operating in underwater
environment, below 100 kHz. For those frequencies PZT piezoelectric ceramic is usually a preferable
choice and PVDF is only considered for frequencies above a few hundreds of kHz. This paper will show
that efficient underwater acoustic projectors for frequencies below 100 kHz can be implemented regarding an
appropriate impedance adapter is being used. The developed project presents a calibrated transmitting
voltage response (TVR) of approximately 166, 160 and 175 dB at 40, 50 and 75 kHz, respectively. The PVDF
TVR values are compatible with the PZT projectors available on market with the advantage of having a larger
bandwidth than most PZT projectors. To the authors knowledge this is the first time that a PVDF projector
attain such characteristics. Although theoretically the PVDF projector bandwidth is larger than 40 to 80
kHz, in practice it was observed that only between those frequencies the project presents a stable
operation for the transmission of long-term signals.
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