Measurement, compensation and control of equivalent shear rate in acoustic wave sensors
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United States of America Patent
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Feb 27, 2007
Grant Date -
May 11, 2006
app pub date -
Dec 19, 2005
filing date -
Dec 22, 2003
priority date (Note) -
Expired
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Abstract
A method for controlling the shear rate at which an acoustic wave device measures viscosity by calculating the shear rate as a function of the characteristic rate of quartz movement in response to a given input transducer power level and the viscosity of the fluid and then by adjusting the input transducer power level to obtain the desired shear rate for the viscosity measurement by optimizing the power level. Related aspects of the invention provide for methods for characterizing viscoelastic fluids at a plurality of predetermined shear rates using a plurality of optimized power levels, a plurality of sensor designs, or a plurality of both optimized power levels and sensor designs.
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