Intermittently activated magnetic shield arrangement for reducin

Details Intermittently activated magnetic shield arrangement for reducin Intermittently activated magnetic shield arrangement for reducin

1989-08-24

1990-10-16

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Magnetometers

33355R, 324117H, 324252, 324253, 357 27, G01R 3306, G01R 3304

Patent

active

049638270

ABSTRACT:
The instant invention is a magnetic field sensor intermittently shielded by a controllable, saturable, magnetic shield. The magnetic shield is periodically driven into saturation by means of an excitation coil. The magnetic field to be measured is not disturbed by the shield during those time intervals when the shield is saturated. Intermittent sensing of the magnetic field to be measured, by the intermittently shielded magnetic field sensor, yields a magnetic field measurement unaffected by l/f noise and offset errors.

REFERENCES:
patent: 2786179 (1957-03-01), Arnold et al.
patent: 4205266 (1980-05-01), Lichtenberg
patent: 4402142 (1983-09-01), Dinsmore
patent: 4463314 (1984-07-01), Wilson
patent: 4649755 (1987-03-01), Volz
patent: 4694583 (1987-09-01), Blaney
patent: 4749939 (1988-06-01), Seitz
Otto Limann, Elecktronik ohne Ballast, 4th Edition, 1975, Franzis Verlag Munchen, p. 139.
ATM Archiv fur Technisches Messen, V392-1, Aug. 1952, pp. 175-178.

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