Title:Viscoelasticity sensor with resonance tuning and low-cost interfaceAuthor(s):Erwin Reichel, Martin Heinisch, Bernhard Jakoby, J. Vermant, Christine E.A. KirschhockAbstract:Electromechanical resonators are sensitive to the material parameters of a surrounding medium and therefore can be used as sensors for viscoelastic properties and density. In our recent work, we presented a metallic plate resonator excited by Lorentz forces in a permanent magnetic field. We improved the interface circuitry by using signal transformers, so that it is now possible to make accurate measurements using a commonly available low-cost audiointerface. Beside that, the necessary sample volume is reduced to a maximum of 50 μl, so that a drop of liquid covers the sensitive area. Using a reflector parallel to the oscillation plane, standing waves in the gap could be generated. A desirable feature of resonator sensors is tunability over a significant frequency range. We investigated mechanisms to change the resonance frequency, e.g. an electric current that induces thermal stress. These advancements pave the way for a versatile low-cost, easy-to-use solution to measure viscoelastic properties in numerous applications.Booktitle:Proceedings of the Eurosensors XXV ConferencePage Reference:4 page(s)Publishing:9/2011