Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/9909
Title: Ultrasonic transducers using electron-irradiated vinylidene fluoride-trifluoroethylene copolymers
Authors: Guo, SS
Lau, ST
Chan, HLW 
Zhao, XZ
Choy, CL 
Keywords: Electrostriction
Irradiation
P(VDF-TrFE)
Ultrasonic transducer
Issue Date: 2003
Publisher: Elsevier
Source: Ultrasonics, 2003, v. 41, no. 3, p. 223-228 How to cite?
Journal: Ultrasonics 
Abstract: Single-element, planar transducers have been fabricated using electron-irradiated poly(vinylidene fluoride-trifluoroethylene) 80/20 mol% copolymers with different electron dosage. Electrical field-induced strain response of copolymer film with 100 Mrad dosage has been studied at 5 kHz and the electrostrictive coefficient was calculated. The transmitting response of the air-backing and epoxy-backing transducers was evaluated with the application of high DC bias voltages. Clear ultrasonic amplitudes and high frequency spectrum (>20 MHz) were observed when driven from a standard ultrasonic voltage source through a decoupling circuit. It has also showed that larger generation of ultrasonic waves will be induced under high DC bias field, which is due to the increase of induced d33 piezoelectric coefficient. Two different polar bias voltages, positive and negative, were applied to the transducers and inverse waveforms were received, which was coincident with the theoretical analysis of the strain response of electrostrictive film.
URI: http://hdl.handle.net/10397/9909
ISSN: 0041-624X
EISSN: 1874-9968
DOI: 10.1016/S0041-624X(02)00463-8
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