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

Anton Vikström (Institutionen för fysik, Kondenserade materiens teori (Chalmers)) ; Marina V. Voinova
Sensing and Bio-Sensing Research (2214-1804). Vol. 11 (2016), p. 78-85.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: Acoustic sensor, Sensor modeling, SH-SAW sensor, Surface acoustic wave, Viscoelasticity



Denna post skapades 2017-01-26. Senast ändrad 2017-03-10.
CPL Pubid: 247716

 

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Institutioner (Chalmers)

Institutionen för fysik, Kondenserade materiens teori (Chalmers)
Institutionen för fysik (GU) (GU)

Ämnesområden

Fysik

Chalmers infrastruktur