Abstract
We study thickness-shear vibration of a rotated Y-cut quartz crystal plate whose one surface is in contact with a viscous fluid layer of finite thickness. The fluid is under an electrode separated from the crystal plate and the driving electric field is in the plate thickness direction. The theory of piezoelectricity and the theory of Newtonian fluids are used. Both free and forced vibration solutions are obtained. An approximate expression for the frequency shifts in the crystal plate due to the fluid is presented. The admittance of the structure is also calculated. The results are useful for acoustic wave fluid sensors.
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