Ultrasonic viscometers are roughly similar to vibration viscometers, they differ primarily in that they are clearly acoustic measurements at high frequencies and low amplitudes.Vibration viscometers are based on the study of the propagation of low-frequency waves with a variable high amplitude in a liquid.Another limitation is that the liquid needs to be transparent. Solid-body viscometers can only be used to measure Newtonian fluids. M = k ω η Īn example of a technical implementation is the Höppler viscometer. Under ideal conditions for the magnitude of this moment: The principle common to all types of rotary viscometers is the measurement of the moment of force that must be overcome by a rotating body immersed in a liquid.
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