Fluid monitoring

Details Fluid monitoring Fluid monitoring

2006-10-03

2006-10-03

Garber, Charles (Department: 2856)

Measuring and testing

Liquid analysis or analysis of the suspension of solids in a...

Viscosity

C073S001860, C073S001820, C073S054410, C702S054000

Reexamination Certificate

active

07114373

ABSTRACT:
An apparatus for measuring the viscosity and temperature of a fluid, for example an engine oil, comprises a transducer, which is arranged to vibrate when provided with a drive signal to produce an ultrasonic shear wave; an impedance matching layer that is inserted into the fluid and which couples at least a portion of the ultrasonic waves produced by the transducer into the fluid and from which at least a portion of the wave is reflected back to the transducer; a detector which is adapted to detect a measurement signal produced by the transducer when the reflected wave is incident upon the transducer; a control circuit which varies the frequency of the drive signal applied to the transducer and hence the frequency of the ultrasound signal; a processing means which determines the optimum frequency of the drive signal at which the measurement signal output from the transducer has its minimum amplitude; and a temperature determining means which estimates the temperature of the fluid as a function of the optimum frequency.

REFERENCES:
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patent: 6223589 (2001-05-01), Dickert et al.
patent: 6763698 (2004-07-01), Greenwood
patent: 2003/0233878 (2003-12-01), Drahm et al.
patent: WO 98/01739 (1998-01-01), None

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