Method and apparatus for dynamic magnetic field neutralization

Details Method and apparatus for dynamic magnetic field neutralization Method and apparatus for dynamic magnetic field neutralization

1989-05-01

1990-10-16

Pascal, Robert J.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Pulse storing

H01J 2906

Patent

active

049637894

ABSTRACT:
A method and apparatus for nulling the magnetic field within a specified volume in the presence of an external ambient field by generating compensating magnetic fields at a number of locations around the volume, sensing the field in the volume and controlling the value of the compensating fields in a closed loop system to null the field within the volume.

REFERENCES:
patent: 2925524 (1960-02-01), Heil
patent: 2962622 (1960-11-01), Popovich
patent: 3340443 (1967-09-01), Rieth et al.
patent: 3404307 (1968-10-01), Hayden
patent: 3757154 (1973-09-01), Okita et al.
patent: 4380716 (1983-06-01), Romeo et al.
patent: 4458178 (1984-06-01), Tenney et al.
"The Evolution of the Modern Electronic Compass" by Martin A. Kits van Heyningen, NMEA News, Jan./Feb. 1987.

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