Measuring and testing – Liquid analysis or analysis of the suspension of solids in a... – Viscosity
Patent
1994-01-28
1994-11-22
Williams, Hezron E.
Measuring and testing
Liquid analysis or analysis of the suspension of solids in a...
Viscosity
73 32A, G01N 1100, G01N 2902
Patent
active
053657780
ABSTRACT:
An ultrasonic viscometer and method for measuring fluid viscosity are provided. Ultrasonic shear and longitudinal waves are generated and coupled to the fluid. Reflections from the generated ultrasonic shear and longitudinal waves are detected. Phase velocity of the fluid is determined responsive to the detected ultrasonic longitudinal waves reflections. Viscosity of the fluid is determined responsive to the detected ultrasonic shear waves reflections. Unique features of the ultrasonic viscometer include the use of a two-interface fluid and air transducer wedge to measure relative signal change and to enable self calibration and the use of a ratio of reflection coefficients for two different frequencies to compensate for environmental changes, such as temperature.
REFERENCES:
patent: 3903732 (1975-09-01), Rork et al.
F. Cohen-Tenoudji et al., "A Shear Wave Rheology Sensor," Mar. 1987, pp. 263-269, IEEE Transactions on Ultrasonics, Ferroelectronics, and Frequency Control, vol. UFFC-34, No. 2.
Sheen et al., "Advanced Research in Instrumentation and Control Technology;" Proceeding of 1990--Conf--900-981 [DE91009344].
Chien Hual-Te
Lawrence William P.
Raptis Apostolos C.
Sheen Shuh-Haw
Roskos Joseph W.
The University of Chicago
Williams Hezron E.
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