Ultrasonic piezoelectric tube resonator for physical liquid property sensing

Ultrasonic sensors are well suited for the determination of physical fluid parameters like e.g. mass density, sound velocity and (longitudinal) viscosity. In this contribution we present the recently devised concept of a sensor setup utilizing resonant pressure waves to determine the so called longitudinal viscosity of fluids. Due to a novel cylindrical geometry, spurious diffraction effects are intrinsically avoided so that a computational correction is superfluously. Beside the basic sensor concept we present an according 1D-model of the whole sensor setup and compare simulation results to measurement results obtained with a first prototype device.