液體負載下平板波的特性分析與實驗量測

郭士豪

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液體負載下平板波的特性分析與實驗量測

The Characteristics of Leaky Lamb Wave Subjected to Fluid Loadings : Analysis and Experiment

郭士豪 , Ph.D　　Advisor：李永春　　

英文

疊波理論；差動式量測系統；黏滯度；導電度；壓電平板；洩漏板波； conductivity ； dielectric ； Leaky Lamb Wave ； Fluid-Loading ； Dispersion Curve ； Differential type measurement method ； viscosity

Abstract │ Reference (54) │ Altmetrics

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This dissertation investigates the characteristics of the leaky Lamb wave propagation in a plate subjected to fluid loadings. Both the theoretical analysis and experimental results are presented. In theoretical investigates, the partial wave theory is applied to analyze the corresponding velocity shifting and attenuation of leaky Lamb waves induced by fluid loadings. With no incident wave involved in the theoretical model, both velocity change and wave attenuation are simultaneously derived. A computer program with the 2D plane search method is implemented for numerically solving the problem. Several cases of leaky Lamb waves are examined including both dielectric and conductive fluid loads on piezoelectric plates and viscous fluid loadings on isotropic plates. In these cases, both the wave velocity and attenuation of leaky Lamb waves are quantitatively determined and influences of each loading parameter are characterized systematically.
	Experimentally, a novel experiment system is designed and developed for measuring small variations in wave velocity and attenuation of leaky Lamb waves. It is a differential type measuring system focusing on the difference between Lamb waves with and without fluid loadings. Therefore, the leaky Lamb wave velocity shifting and the wave attenuation can be experimentally determined with high sensitivity and accuracy. The uniqueness and strength of this differential measurement system for leaky Lamb waves have been successfully tested and verified through a series of experiments.
	Finally, an XZ-LiNbO3 wafer and a soda lime glass plate are chosen as the sample plates for both theoretical and experimental investigations on fluid’s loading effects on leaky Lamb waves. The former is for electrical loading effects, which include both dielectric and conductive loadings, and the latter for mechanical loadings including mass and viscous loadings. Numerical calculations base on the partial wave theory and experimental measurements using the differential measurement system are carried out for a number of different fluids loaded on the sample plates. Experimentally measured results in general agree well with those predicted by theoretical analysis, which implies the validity of partial wave theory in dealing with leaky Lamb wave problems. These results are important in designing new type of acoustic wave sensors working in liquid phase.

Reference ( 54 ) 〈TOP〉

[4] T. K. Eto and B. Rubinsky, “Lamb wave microsensor measurement of viscosity as a function of temperature of dimethylsulfoxide solutions,” Topics in heat transfer, ASME., vol 2, pp. 47-53, 1992.
連結：
[5] T. K. Eto, B. J. Costello, S. W. Wenzel, R. M. White and B. Rubinsky, “Viscosity sensing with Lamb-wave microsensor: dimethylsulfoxide solutions viscosity as a function of temperature,” J. Biomechanical Engin., vol 115, pp. 329-331, 1993.
連結：
[6] F. Padilla, M. Gindre, J.-Y. Le Huerou, “Model and measurements of the electrical input impedance of a plate-liquid-plate acoustic resonator,” IEEE Trans. Ultrason., Ferroelect., Freq. Contr., vol. 48, n. 3, pp. 838-843, 2001.
連結：
[7] M. S. Weinberg, C. E. Dube, A. Petrovich, A. M. Zapata, “Fluid damping in resonant flexural plate wave device,” J. Microelectromech. Syst., vol. 12, n. 5, pp. 567-576, 2003.
連結：
[8] M. J. Vellekoop, “Acoustic wave sensors and their technology,” Ultrasonics, vol. 36, n. 1-5, pp.7-14, 1998.
連結：

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