Method and apparatus for substantially eliminating magnetic fiel

Details Method and apparatus for substantially eliminating magnetic fiel Method and apparatus for substantially eliminating magnetic fiel

1990-11-01

1992-06-30

Wieder, Kenneth A.

Electricity: measuring and testing

Magnetic

Magnetometers

324262, 307147, 174 32, G01R 33025

Patent

active

051266660

ABSTRACT:
A method and apparatus for conducting DC current in the vicinity of a magnetometer without magnetic field interference thereto. The conductor in the area of the magnetometer is in the form of a plurality of twisted line pairs which are braided or otherwise intertwined to form a generally tubular-shaped construct which is preferably cylindrical. First and second equipotential surfaces are provided on each end of the construct with potential differences which are equal and opposite being applied between the first and second pair of surfaces, respectively. A first line of each twisted pair is connected between the first equipotential surfaces and the other line of each twisted pair is connected between the second equipotential surfaces, resulting in substantial equal and opposite DC currents flowing in the lines of each twisted pair. The magnetometer is positioned within the twisted pair construct, preferably near the center thereof. The effect is a substantially zero magnetic field in the area of the magnetometer.

REFERENCES:
patent: 3619655 (1971-11-01), Cunningham
patent: 4056790 (1977-11-01), Pospischil et al.
patent: 4504696 (1985-03-01), Piper
patent: 4506235 (1985-03-01), Mayer
patent: 4739262 (1988-04-01), Fleetwood
patent: 4808923 (1989-02-01), Posseme
patent: 5015953 (1991-05-01), Ferguson et al.

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