Measuring and testing – Volume or rate of flow – By measuring electrical or magnetic properties
Patent
1994-12-06
1996-09-03
Chilcot, Richard
Measuring and testing
Volume or rate of flow
By measuring electrical or magnetic properties
7386117, G01F 100
Patent
active
055513069
ABSTRACT:
A flowmeter for measuring the velocity of a fluid produces magnetic field transverse to the direction of fluid velocity thereby inducing a voltage potential in the fluid. The magnetic field may be produced using either electromagnets or permanent magnets. Two primary electrodes in electrical contact with the fluid, spaced apart along a first line transverse to the direction of the magnetic field and transverse to the direction of the fluid velocity sense the induced voltage potential and a background voltage across the fluid. Two secondary electrodes in electrical contact with the fluid, spaced apart along a plane parallel to the direction of the magnetic field and parallel to the direction of the fluid velocity, sense the background voltage across the fluid. A signal processor, responsive to the primary and secondary electrodes, generates a velocity signal representative of the magnitude of the velocity of the fluid. A magnetic sensor senses the magnitude of the magnetic field across the fluid and the signal processor corrects the velocity signal for any fluctuations in the magnetic field.
REFERENCES:
patent: 2722122 (1955-11-01), Soffel
patent: 3992377 (1976-03-01), Ginzburg et al.
patent: 4236410 (1980-12-01), Appel et al.
patent: 4346604 (1982-08-01), Snook et al.
Biegel Ronald
Chilcot Richard
Hersey Measurement Company
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