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Title: Spherically shaped active transducer based on proton-irradiated vinylidene fluoride-trifluoroethylene 70/30 mol% copolymer
Authors: Lau, ST
Chan, HLW 
Choy, CL
Cheung, WY
Wong, SP
Keywords: Polymer blends
Polymer films
Proton effects
Ultrasonic transducers
Issue Date: 26-May-2006
Publisher: American Institute of Physics
Source: Review of scientific instruments, 26 May 2006, v. 77, 055110, p. 1-6 How to cite?
Journal: Review of scientific instruments 
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.
ISSN: 0034-6748
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
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