U-shaped wire based resonators for mass density and viscosity sensing

In this contribution, U-shaped resonators used for viscosity and mass density sensing are presented. These devices were especially designed to reduce and overcome spurious instabilities, which were observed in previous sensor designs. Five sensor designs are presented and their sensitivities to viscosity and mass density are examined. The setups are discussed regarding their working principle, sensitivity, cross-sensitivity to temperature and repeatability. The measurement results in liquids featuring different viscosities and mass densities are shown and the theory necessary to relate the measured data to viscosity and mass density is outlined.