Electronic viscometer

Details Electronic viscometer Electronic viscometer

1996-06-25

1998-01-20

Williams, Hezron E.

Measuring and testing

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

Viscosity

73 5426, G01N 1110

Patent

active

057103747

ABSTRACT:
An electronic viscometer having a vibrating drive in a hollow probe which oscillates along its longitudinal axis and is damped by a sample into which the probe is inserted. The viscometer has a piezoelectric crystal having a feedback electrode, a phase locked loop circuit to track the resonant frequency, drive amplifiers and buffers, and a phase compensation network to ensure that the proper phase relationship is maintained between piezoelectric drive and feedback signals.

REFERENCES:
patent: 3062040 (1962-11-01), McKennell et al.
patent: 3587295 (1971-06-01), Simons
patent: 4922745 (1990-05-01), Rudkin et al.
patent: 5571952 (1996-11-01), Kauzlarich

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