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A Point-Focus PVDF Transducer for Lamb Wave Measurements

Published online by Cambridge University Press:  05 May 2011

Yung-Chun Lee ,
Yi Fan Tein  and
Yu Yi Chao
Yung-Chun Lee*
Affiliation:
Department of Mechanical Engineering, National Cheng Kung University, Tainan, Taiwan 701, R.O.C.
Yi Fan Tein*
Affiliation:
Department of Mechanical Engineering, National Cheng Kung University, Tainan, Taiwan 701, R.O.C.
Yu Yi Chao*
Affiliation:
Department of Mechanical Engineering, National Cheng Kung University, Tainan, Taiwan 701, R.O.C.
*
*Associate Professor
**Graduate Student
**Graduate Student
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Abstract

This paper reports the development of a point-focused PVDF transducer with a large aperture surface and its application on measuring Lamb wave dispersion curves. The point-focused transducer is constructed by forcing a piezoelectric PVDF film into a concave spherical shape. The acoustic waves radiated from the PVDF film are then focused into a point without using any acoustic lens. Similar to its line-focused counterpart, the point-focused transducer is capable of measuring dispersion curves of lamb waves provided its aperture angle is large enough. To verify this, experimental testing is carried out on several thin metal plates and good measurement results are observed. Future improvements and applications on the transducer will be addressed.

Keywords

Point-focused acoustic transducerPVDF filmLamb wave dispersion curve
Type
Articles
Information
Journal of Mechanics , Volume 18 , Issue 1 , March 2002 , pp. 29 - 33
Copyright
Copyright © The Society of Theoretical and Applied Mechanics, R.O.C. 2002

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References

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