Abstract
A liquid-loading effect on the propagation characteristics of leaky Lamb waves (LLWs) is studied, based on numerical calculations and experiments. A layered substrate consisting of a thin piezoelectric ceramic plate and a thin acrylic plate is used as a propagation guide of the LLW. Interdigital transducers are mounted on the free surface of the ceramic plate and a liquid is in contact with one of the two surfaces of the acrylic plate. Under the condition that the density ratio of water and the acrylic plate is high (0.85), anomalous behaviors of the velocity dispersion curves appear, which do not occur for water-loading on substrates with much higher densities such as ceramic and glass plates. Two typical features of the LLW propagating in the layered substrate are jump of the propagation mode under the influence of the liquid-loading and the modal change of the interaction between two propagation modes. The state change of mode coupling induced by liquid loading is promising for constructing sensing devices.
Published Version
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