Abstract
To generate self-demodulated low-frequency acoustic waves with high directivity in audio directional system, an integral piezoelectric P(VDF-TrFE) 80/20 mol% film, proving as a typical ferroelectricity and exhibiting the excellent electromechanical coupling factors, is formed into a regular wavy shaped transducer. The frequency response and directivity performances of the large-size transducer are theoretically simulated using COMSOL software, showing that the response is relative smooth over the audio frequency range. As such, the highest sound pressure level is located at a resonant frequency of 40 kHz, while the sound is highly directional and the 3-dB beam-width becomes increasingly sharp with the raise of size of P(VDF-TrFE) film. Interestingly, the integral wavy shaped P(VDF-TrFE) transducer exhibits a sound pressure of 78 dB at 500 mm and the 3-dB beam-widths of 100 Hz,1 kHz, and 6 kHz are ±2.8º, ±3.1º, and ±2.9º, respectively. Thus, the wavy type P(VDF-TrFE) transducer is duplicatable and easy to facilitate extra-large for emerging applications.
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