Verfahren zur Ermittlung der Viskosität eines strömenden oder ruhenden Fluids

The method involves applying ultrasonic waves on a fluid along measuring sections (MS1, MS2) in a measuring chamber (1), and detecting the ultrasonic waves that are uncoupled from the fluid after passing through the measuring section. The detected ultrasonic waves are converted into ultrasonic signals. Viscosity of the fluid is computed based on the amplitude and frequency of the ultrasonic signals and a time period required for the ultrasonic waves for passing through the measuring section. A reference medium i.e. water, with preset viscosity, density and sound velocity is selected.