Generation of very high-frequency ultrasonic waves using thin films of vinylidene fluoride-trifluoroethylene copolymer
- 15 May 1987
- journal article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 61 (10) , 4749-4754
- https://doi.org/10.1063/1.338812
Abstract
Electromechanical properties of thin films of vinylidene fluoride‐trifluoroethylene copolymer [P(VDF‐TrFE)] and their application to ultrasonic transducers were studied in the frequency range of 50–250 MHz at room temperature. A 5‐μm‐thick P(VDE‐TrFE) film resonating at 250 MHz in thickness extensional mode exhibited a large electromechanical coupling factor of 0.26. The dielectric and elastic constants were also studied in this frequency region. A transducer using a 3‐μm‐thick film exhibited a large conversion efficiency (6.5 dB at 150 MHz), and good impulse response (30 ns ring‐down time width) in water. A concave transducer transmitted a well‐focused ultrasonic beam (35‐μm beamwidth).This publication has 18 references indexed in Scilit:
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