Lee Yung-Chun, Kuo Shi Hoa
Department of Mechanical Engineering, National Cheng Kung University, Tainan, Taiwan.
IEEE Trans Ultrason Ferroelectr Freq Control. 2006 Sep;53(9):1617-26. doi: 10.1109/tuffc.2006.1678190.
This paper proposes a novel experimental method for measuring the propagating characteristics of leaky Lamb waves in a piezoelectric plate surrounded by a fluid. It is a differential type of measurement and is very sensitive to the velocity change and wave attenuation of leaky Lamb waves induced by fluid-loading effects. Experimental measurements on an X-cut LiNbO3 plate immersed in a dielectric and conductive fluid have been carried out. The velocity change and wave attenuation of the leaky Lamb waves caused by dielectric and conductive loadings of the fluid have been experimentally determined. The measured data have been compared with the theoretical ones that are calculated from a partial wave analysis. For the wave velocity, very good agreements between the experimental and theoretical results are observed. For the wave attenuation, there are some discrepancies, but an important characteristic in the relationship between wave attenuation and fluid conductivity as predicted by the theory have been verified experimentally.
本文提出了一种新颖的实验方法，用于测量被流体包围的压电板中泄漏兰姆波的传播特性。这是一种差分测量类型，对流体加载效应引起的泄漏兰姆波的速度变化和波衰减非常敏感。已对浸没在介电和导电流体中的X切LiNbO3板进行了实验测量。通过实验确定了由流体的介电和导电加载引起的泄漏兰姆波的速度变化和波衰减。将测量数据与通过部分波分析计算得到的理论数据进行了比较。对于波速，实验结果与理论结果之间观察到非常好的一致性。对于波衰减，存在一些差异，但理论预测的波衰减与流体电导率之间关系的一个重要特征已通过实验得到验证。
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