期刊
SENSORS AND ACTUATORS A-PHYSICAL
卷 123-24, 期 -, 页码 379-387出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.sna.2005.05.013
关键词
interdigital transducers; polyvinylidene fluoride (PVDF); Lamb waves; carbon fiber composites; smart materials; non-destructive testing (NDT)
In this work a new technology for designing and manufacturing ultrasonic interdigitat transducers (IDT) is presented. The piezoelectric material used is a metallised piezopolymer film made of polyvinylidene fluoride (PVDF) with electrode pattern obtained with a laser ablation process. Piezopolymer transducer prototypes are designed with wavelength of 8 mm to operate with Lamb waves (symmetrical S-0 mode). An experimental validation of the piezopolymer IDT design is demonstrated with a transmitter-receiver IDT pair embedded in a 3 mm thick carbon fiber reinforced plastic (CFRP) composite laminate. Acoustical response and the electrical impedance have been calculated. These transducers are proposed for monitoring structural integrity of structures/components made of carbon epoxy composite laminates commonly used in spacecrafts, satellite and airplanes. (C) 2005 Elsevier B.V. All rights reserved.
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