Analytical 3D-analysis of compressional wave excitation by thickness-shear-mode resonators

Author

Beigelbeck, Roman ; Jakoby, Bernhard

Author_Institution

Res. Unit of Integrated Sensor Syst., Austrian Acad. of Sci., Austria

fYear

2004

fDate

24-27 Oct. 2004

Firstpage

91

Abstract

Piezoelectric thickness-shear-mode resonators are well established as viscosity and chemical liquid sensors. When immersed in the sample liquid, the resonator excites a strongly damped shear-polarized wave as well as spurious compressional waves in the liquid. The latter are scarcely damped, which can lead to disturbing interferences if they are reflected by obstacles close to the sensor. In order to analyze the spurious compressional wave excitation, we developed a three-dimensional mathematical model utilizing solutions of the linearized Navier-Stokes equation in the spatial Fourier-domain, which govern the acoustic field in the liquid. Finally, we discuss the solutions and illustrate the results by considering practical examples.

Keywords

Fourier analysis; Navier-Stokes equations; acoustic resonators; chemical sensors; fluid oscillations; interference (wave); liquid waves; piezoelectric devices; viscosity measurement; 3D mathematical model; analytical 3D-analysis; chemical liquid sensors; compressional wave excitation; damped shear-polarized wave; disturbing interferences; linearized Navier-Stokes equation; liquid acoustic field; obstacle-reflected waves; piezoelectric thickness-shear-mode resonators; sample liquid; spatial Fourier-domain; spurious compressional wave excitation; viscosity sensors; Acoustic sensors; Acoustic waves; Chemical sensors; Electrodes; Frequency; Interference; Navier-Stokes equations; Sensor systems; Surface waves; Viscosity;

fLanguage

English

Publisher

ieee

Conference_Titel

Sensors, 2004. Proceedings of IEEE

Print_ISBN

0-7803-8692-2

Type

conf

DOI

10.1109/ICSENS.2004.1426107

Filename

1426107