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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).
Published in:
Journal of Applied Physics
(Volume:61
,
Issue:
10
)
Date of Publication: May 1987
- Page(s):
- 4749 - 4754
- ISSN :
- 0021-8979
- Digital Object Identifier :
- 10.1063/1.338812
- Product Type:
- Journals & Magazines
- Date of Current Version :
- 07 July 2009
- Issue Date :
- May 1987
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