Measuring and testing – Volume or rate of flow – By measuring electrical or magnetic properties
Patent
1979-10-09
1981-04-14
Ruehl, Charles A.
Measuring and testing
Volume or rate of flow
By measuring electrical or magnetic properties
73181, G01F 158
Patent
active
042612101
ABSTRACT:
An electrical flowmeter having signal electrodes laterally spaced along a line perpendicular to fluid flow and sensitive to a voltage field set up in the fluid by a magnetic field is provided with a plurality of planar helically coiled conductive windings disposed in stacked arrangement parallel to the direction of fluid flow. The spiral windings are connected to a push-pull current drive source. The signal electrodes are spaced proximate to the outer coil winding of the coil closest to the fluid. The windings of the coils are alternately oriented in opposite, clockwise-counterclockwise disposition. Each spiral coil ends in an inner and an outer terminus, and the inner termini of all coils are connected together, while the outer termini of the clockwise disposed coils are connected in parallel with each other. The outer termini of the counterclockwise disposed coils are also connected in parallel with each other. The electrical field set up in the fluid impresses a voltage field across the signal electrodes proportional to relative fluid velocity and is immune from quadrature and hydrodynamic effects.
REFERENCES:
patent: 2557393 (1951-06-01), Rifenbergh
patent: 3503258 (1970-03-01), Baker
patent: 3620079 (1971-11-01), Nosley
patent: 3881350 (1975-05-01), Nosley
patent: 4000648 (1977-01-01), Olson
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