Hostname: page-component-cd9895bd7-hc48f Total loading time: 0 Render date: 2024-12-24T17:12:43.501Z Has data issue: false hasContentIssue false
  • English
  • Français

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
Get access

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1Lerch, R., “Electroacoustic Transducers Using Piezoelectric Polyvinylidene Fluoride Films,” J. Acoust. Soc. Am., 66(4), pp. 952–954 (1979).CrossRefGoogle Scholar
2Kobayashi, K. and Yasuda, T., “An Application of PVDF-film to Medical Transducers,” Ferroelectrics, 32, pp. 181–184 (1981).Google Scholar
3Gallantree, H. R., “Review of Transducer Applications of Polyvinylidene Fluoride,” IEE Proc, Vol. 130, Pt. 1, No. 5, pp. 219–224, 1983.Google Scholar
4Hadjicostis, A. N., Hottinger, C. F., Rosen, J. J. and Wells, P. N. T., “Ultrasoin Transducer Materials for Medical Applications,” Ferroelectrics, 60, pp. 107–126 (1984).CrossRefGoogle Scholar
5Ohigashi, H., Koga, K., Suzuki, M., Nakanishi, T., Kimura, K. and Hashimoto, N., “Piezoelectric and Ferroelectric Properties of P(VDF-TrFE) Copolymers and Their Application to Ultrasonic Transducers,” Ferroelectrics, 60, pp. 263–276 (1984).CrossRefGoogle Scholar
6Platte, M., “PVDF Ultrasonic Transducers,” Ferroelectrics, 75, pp. 327–337 (1987).CrossRefGoogle Scholar
7Zhang, Q., Lewin, P. A. and Bloomfield, P. E., “PVDF Transducers — A Performance Comparison of SingleLayer and Multiplayer Structures,” IEEE Trans. Ultrason. Ferroelect. Freq. Contr., 44(5), pp. 1148–1156 (1997).CrossRefGoogle Scholar
8Smolorz, S. and Grill, W., “Focusing PVDF Transducers for Acoustic Microscopy,” Res. Nondestr. Eval., 7, pp. 195–201 (1996).CrossRefGoogle Scholar
9Xiang, D., Hsu, N. N. and Blessing, G. V., “The Design, Construction and Application of a Large Aperture Lens-less Line-Focus PVDF Transducer,” Ultrasonics, 34 (6), pp. 641–647 (1996).CrossRefGoogle Scholar
10Xiang, D., Hsu, N. N. and Blessing, G. V., “Time Domain Waveforms of A Line-Focus Transducer Probing Anisotropic Solids,” Nondestructive Characterization of Materials VIII, Green, R.B. Jr., ed., Plenum Press, New York, pp. 799–804 (1997).Google Scholar
11Hsu, N. N., Xiang, D. and Blessing, G. V., “A Simplified Ultrasonic Immersion Technique for Material Evaluation,” Material Evaluation, 50 (7), pp. 854–859 (1998).Google Scholar
12Lee, Y.-C. and Ko, S.-P., “Measuring Dispersion Curves of Acoustic Waves Using PVDF Line-Focus Transducers,” NDT&E Int., 34(3), pp. 191–197 (2001).CrossRefGoogle Scholar
13Lee, Y.-C., “Measurements of Multimode Leaky Lamb Waves Propagating in Metal Sheets,” Jap. J. Appl. Phys., 40(1), pp. 359–363 (2001).CrossRefGoogle Scholar
14Kushibiki, J. and Chubachi, N., “Material Characterization by Line-Focus Beam Acoustic Microscopy,” IEEE Trans. Sonics Ultrason., SU–32, pp. 189–212 (1985).CrossRefGoogle Scholar
15Viktorov, I., Rayleigh, A. and Lamb, Waves: Physical Theory and Applications, Plenum Press, New York, pp. 117–121 (1967).Google Scholar