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Viscosity sensor

Viscosity, the resistance a fluid presents to flow, is often an important measurement. Many commercial and industrial processes require precise knowledge of the physical properties of substances being used in those processes in order to operate efficiently. In a factory, viscosity of fluid materials is often measured. Viscosity is measured by observing the time required for a certain volume of the liquid to flow through a short tube of small bore. Viscosity measurements utilizing piezoelectric sensors are generally based on the phenomenon that a dissipative or damping force that resists the motion of an energized piezoelectric element lowers its resonant frequency. Vibratory viscometers enerally employ a transducer which has an immersible portion which is vibrated with a small amplitude. Fluid viscosity, density and viscoelasticity can be determined from the frequency and/or amplitude changes in the vibration or the power required to sustain the vibration when the immersible portion of the transducer is immersed in a fluid. Usually an oscillator is inserted into a fluid, and the oscillation frequency and the damping of the oscillation are observed. The viscosity of the surrounding fluid may be inferred based on a shift of the oscillation frequency and/or an altered damping.

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