Separate experimental investigation of the influence of liquids? mass densities and viscosities on the ferquency response of resonant sensors using designated liquid series
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IEEE Sensors Conference
For resonant viscosity and mass density sensors, oscillating in a test liquid with viscosity ?, mass density ? and temperature T , usually, resonance frequency fr and quality factor Q are evaluated and subsequently related to ? and ?. As both, fr and Q depend on ?, ? as well as on T, it is often difficult to separate the origin of these fr and Q changes. Separate experimental investigations of the effects of ? and ? on fr and Q are thus desired. For this purpose, new models for binary and ternary liquid mixtures have been elaborated for calculating the necessary mixing ratio to obtain a desired ? and ? at a certain T. This allows mixing liquid series with constant ? but varying ? (and vice versa). These liquid series and their modeling are discussed in detail and measurement results obtained with such resonant liquid series are shown.