Comparison and experimental validation of two potential resonant viscosity sensors in the kilohertz range
Résumé
Oscillating microstructures are well-established and find application in many fields.
These include, force sensors, e.g. AFM micro-cantilevers or accelerometers based on resonant
suspended plates. This contribution presents two vibrating mechanical structures acting as
force sensors in liquid media in order to measure hydrodynamic interactions. Rectangular cross
section microcantilevers as well as circular cross section wires are investigated. Each structure
features specific benefits, which are discussed in detail. Furthermore, their mechanical
parameters and their deflection in liquids are characterized. Finally, an inverse analytical
model is applied to calculate the complex viscosity near the resonant frequency for both types
of structures. With this approach it is possible to determine rheological parameters in the kilo
Hertz range in situ within a few seconds. The monitoring of the complex viscosity of yogurt
during the fermentation process is used as a proof of concept to qualify at least one of the two
sensors into opaque mixtures.
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