Measurement of density and viscoelasticity with a single...

Details Measurement of density and viscoelasticity with a single... Measurement of density and viscoelasticity with a single...

2004-04-22

2009-06-30

Williams, Hezron (Department: 2856)

Measuring and testing

Specific gravity or density of liquid or solid

Reexamination Certificate

active

07552619

ABSTRACT:
A sensor, method and system, for measuring certain characteristics of a fluid. The sensor utilizes a piezoelectric device having at least two tightly coupled resonators providing a two pole electric transfer function responsive to an electrical signal coupled to the input resonator. The piezoelectric sensor has a textured entrapment layer, constructed to entrap a known volume of fluid and impart motion to the entrapped fluid as well as to surrounding non-trapped fluid. The common mode frequency shift of the two resonant frequencies is related to mass loading due to the entrapped fluid, while the energy absorbed by the fluid, or a phase shift of one of the resonant frequencies, is related to the viscosity/density product of the fluid. Extracting the viscosity is a matter of mathematical manipulation. By controlling the energy level of the input electrical signal, the viscosity measurement may be conducted at a predetermined shear rate.

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