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Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/557

Title: Spherically shaped active transducer based on proton-irradiated vinylidene fluoride-trifluoroethylene 70/30 mol% copolymer
Authors: Lau, Sien Ting
Chan, Helen L. W.
Choy, Chung-loong
Cheung, W. Y.
Wong, S. P.
Subjects: Polymer blends
Polymer films
Proton effects
Electrostriction
Piezoelectricity
Ultrasonic transducers
Issue Date: 26-May-2006
Publisher: American Institute of Physics
Citation: Review of scientific instruments, 26 May 2006, v. 77, 055110, p. 1-6.
Abstract: Spherically shaped active transducers using proton-irradiated vinylidene fluoride-trifluoroethylene 70/30 mol % copolymer films as the active elements are described. The copolymer films prepared by hot compression molding were irradiated with a high energy proton over a broad dose range (20-250 Mrad). The electrostrictive and piezoelectric responses of the copolymer have been characterized before subsequent transducer fabrication. The performances of the focused transducers constructed with a 4 mm aperture size and epoxy backing were evaluated under dc bias voltages. The transducers with focal lengths of 17.4-19.0 mm and a center frequency of 19 MHz display a broad bandwidth up to 94%. Besides, the transmitting output of the transducers increases with the dc bias voltage. For the copolymer active element irradiated at a proton dose of 107 Mrad, the transducer shows the highest transmitting voltage response of 1.34 kPa/V.
Rights: © 2006 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in S.T. Lau et al., Rev. Sci. Instrum. 77, 055110 (2006) and may be found at http://link.aip.org/link/?rsi/77/055110
Type: Journal/Magazine Article
URI: http://hdl.handle.net/10397/557
ISSN: 00346748
Appears in Collections:MRC Journal/Magazine Articles
AP Journal/Magazine Articles

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