The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 23, 1999
Filed:
Aug. 10, 1998
Dean M Ball, Gainesville, GA (US);
Cannon Instrument Company, State College, PA (US);
Abstract
A rotational viscometer is disclosed for measuring the viscosity of a rotating fluid. The viscometer includes a measurement disk that is positioned within the rotating fluid and is interconnected via a shaft with a measurement arm mounted within a housing. A light source is mounted within the housing and emits a beam of light onto one or more light receivers. The light receivers provide an output signal that is a function of the amount of light received. An end of the measurement arm is movably disposed between the light source and the light receivers. Pivoting of the measurement arm controls the amount of light received by the light receivers. A signal processor receives the output signals from the light receivers and determines a restorative signal therefrom. The restorative signal is provided to a balance coil which is located adjacent a permanent magnet. The balance coil generates an electromagnetic field as a, function of the restorative signal. An adjustment shaft has one end engaged with the balance coil and the other end attached to the measurement arm. The generation of an electromagnetic field in the balance coil causes the adjustment shaft to translate resulting in pivoting of the measurement arm about its center of rotation in an opposite direction from its initial displacement. An output device receives the restorative signal and determines the viscosity of the fluid therefrom.