Soft-film dynamics of SH-SAW sensors in viscous and viscoelastic fluids

We theoretically investigate surface acoustic waves with horizontal polarization (SH-SAWs) propagating in a three-layer system consisting of an elastic substrate and two viscoelastic overlayers. For the limiting case of an acoustically thin middle layer and an infinite top layer, we derive analytica...

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Bibliographic Details
Published in:Sensing and Bio-Sensing Research 2016-12, Vol.11, p.78-85
Main Authors: Vikström, A., Voinova, M.V.
Format: Article
Language:English
Subjects:
Acoustic sensor
Sensor modeling
SH-SAW sensor
Surface acoustic wave
Viscoelasticity
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Summary:We theoretically investigate surface acoustic waves with horizontal polarization (SH-SAWs) propagating in a three-layer system consisting of an elastic substrate and two viscoelastic overlayers. For the limiting case of an acoustically thin middle layer and an infinite top layer, we derive analytical expressions for the phase velocity shift and the wave attenuation. These expressions demonstrate the importance of taking into account the viscoelastic coupling between the two overlayers. Numerical calculations using a combined Maxwell/Voigt scheme confirm our analytical results and also indicate that it is possible for viscoelasticity to cause SH-SAWs to vanish.
ISSN:2214-1804
2214-1804
DOI:10.1016/j.sbsr.2016.08.004