Measuring device and for the determination of physical properties of fluids, in particular the viscosity, density, speed of sound, or compressibility

摘要

Measuring device for the determination of physical properties of fluids, in particular, the viscosity, density, speed of sound or kompressibi the stability of piezoceramic element has a resonator and mechanical contact with the fluid has, wherein the resonator has an inhomogeneous be prepolarized by and has at least three electrodes, and the means for the excitation of oscillations or vibrations at least two different modes.