17 May 2005 Interdigitated PVDF transducer for Lamb wave generation and reception
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Piezoelectric materials have been widely used in ultrasonic nondestructive testing (NDT). PZT ceramics can be used to receive and generate surface acoustic waves. It is a common application to attach PZT transducers to the surface of structures for detecting cracks in nondestructive testing. However, not until recently have piezoelectric polymers attracted more and more attention to be the material for interdigitated (IDT) surface and guided-wave transducers. In this paper, an interdigitated gold-on-polyvinyldine fluoride (PVDF) transducer for actuating and sensing Lamb waves has been introduced. A specific etching technology is employed for making the surface electrodes into a certain finger pattern, the spacings of which yield different single mode responses of Lamb waves. Experiments have been performed on steel plates. Results from PVDF IDT sensors have been compared with those from PZT transducers for verification.
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Hua Gu, Hua Gu, George M. Lloyd, George M. Lloyd, Ming L. Wang, Ming L. Wang, } "Interdigitated PVDF transducer for Lamb wave generation and reception", Proc. SPIE 5765, Smart Structures and Materials 2005: Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems, (17 May 2005); doi: 10.1117/12.599794; https://doi.org/10.1117/12.599794

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