Abstract
This paper develops broadband Poly(vinylidene fluoride-trifluoroethylene) [P(VDF-TrFE)] focusing transducers and its surface wave measurement system for determining the elastic constants of coating layers. The measurement is based on a defocussing measurement method and V(f,z) analysis of the focusing transducers. Few P(VDF-TrFE) focusing transducers are successfully fabricated in laboratory and the wave measurements can cover a wide frequency range of 4–120 MHz with great accuracy. Brass and glass substrates electroplated with nickel coating layer with thickness ranging from 15 to 60 μm are tested in this work. Dispersion curves sensitivity analysis is carried out to decide the best approach for inversely determination of coating elastic properties. A searching method based on the downhill simplex algorithm and numerical calculation on waves in a layered half-space model is used for inversely determining the elastic constants of coating layer. The results show good agreement with reported data. Measurement accuracy and potential applications for other types of nondestructive evaluation of the focusing transducers and measurement system are addressed.
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Kim, J.O., Achenbach, J.D., Mirkarimi, P.B., Shinn, M., Barnett, S.A.: J. Appl. Phys. 72, 1805 (1992)
Lee, Y.C., Kim, J.O., Achenbach, J.D.: IEEE Trans. Ultrason. Ferroelectr. Freq. Control 42, 253 (1995)
Li, W., Achenbach, J.D.: In: Proc. of IEEE Ultrason. Symp., p. 883 (1995)
Cros, B., Gat, E., Saurel, J.M.: J. Non-Cryst. Solids 209, 273 (1997)
Kushibiki, J., Chubachi, N.: IEEE Trans. Sonics Ultrason. 32, 189 (1985)
Cho, H., Sato, H., Takemoto, M., Sato, A., Yamanaka, K.: Jpn. J. Appl. Phys. 35, 3062 (1996)
Cho, H., Sato, H., Nishino, H., Tsukahara, Y., Inaba, M., Sato, A., Takemoto, M., Nakano, S., Yamanaka, K.: In: Proc. of IEEE Ultrason. Symp., p. 757 (1995)
Neubrand, A., Hess, P.: J. Appl. Phys. 71, 227 (1992)
Hess, P.: Appl. Surf. Sci. 106, 429 (1996)
Xiang, D., Nelson, N.H., Blessing, G.V.: Ultrasonics 34, 641 (1996)
Lee, Y.C.: Ultrasonics 39, 297 (2001)
Lee, Y.C., Cheng, S.W.: IEEE Trans. Ultrason. Ferroelectr. Freq. Control 48, 830 (2001)
Lee, Y.C.: Jpn. J. Appl. Phys. 40, 359 (2001)
Lee, Y.C., Chu, C.C.: Jpn. J. Appl. Phys. 44, 1462 (2005)
Robert, M., Molingou, G., Snook, K., Cannata, J., Shung, K.K.: J. Appl. Phys. 96, 252 (2004)
Brown, L.F.: IEEE Trans. Ultrason. Ferroelectr. Freq. Control 47, 1377 (2000)
Kimura, K., Ohigashi, H.: J. Appl. Phys. 61, 4749 (1987)
Farnell, G.W., Adler, E.L.: Physical Acoustics: Principles and Methods, vol. IX, p. 35. Academic Press, New York (1972)
Kinsler, L.E., Frey, A.R., Coppens, A.B., Sanders, J.V.: Fundamentals of Acoustics, 3rd edn. Wiley, New York (1982)
Dennis, J.K., Such, T.E.: Nickel and Chromium Plating, 3rd edn. Woodhead, Cambridge (1993)
Lematre, M., Benmehrez, Y., Bourse, G., Xu, J.W., Ourak, M.: NDT&E Int. 35, 493 (2002)
William, H.P., Brian, P.F., Saul, T.A., William, V.T.: Numerical Recipes: The Art of Scientific Computing. Cambridge University Press, New York (1986)
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Chung, CH., Lee, YC. Broadband Poly(vinylidene fluoride-trifluoroethylene) Ultrasound Focusing Transducers for Determining Elastic Constants of Coating Materials. J Nondestruct Eval 28, 101 (2009). https://doi.org/10.1007/s10921-009-0052-x
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DOI: https://doi.org/10.1007/s10921-009-0052-x