Abstract
This study theoretically and experimentally investigated the relaxation of acoustic plate modes (APMs) under high viscous fluid loading. Partial wave theory was adopted to analyze acoustic waves that propagate in a piezoelectric plate and fluid, which was modeled as a Maxwellian fluid. A delay-line APM sensor consisted of input and output interdigital transducers (IDTs) with center frequency of 51 MHz was proven experimentally. By varying the ambient temperature, the insertion-loss saturation of APM, which was in contact with glycerol, was clear because of relaxation. Comparing the theoretical results with the experimental data yielded a high-frequency shear rigidity modulus of 2.5 ×108 N/m2, which was related to the relaxation effect of the fluid. The dependence of APM frequency on temperature was also obtained. The high linearity of the relationship revealed that the APM sensor could be used to detect the temperature of the surrounding fluid.
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