Electricity: measuring and testing – Magnetic – Magnetometers
Patent
1985-02-22
1987-09-08
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
Magnetometers
324117H, 324254, 338 32H, G01R 3306
Patent
active
046927034
ABSTRACT:
An alternating magnetic excitation field is generated in the flux concentrators (11,12) of a Hall effect device, including a Hall element (13), by passing an a.c. current through a coil (14). This alternating field serves to drive the flux concentrators into and out of saturation. In the presence of a d.c. magnetic field and when a Hall current is applied to the Hall element, a second harmonic component is generated in the output voltage of the Hall element (13); the amplitude of the second harmonic component providing a measure of the d.c. magnetic field. In an alternative arrangement (FIG. 4) the flux concentrator means is in loop form rather than in a flat configuration as in FIG. 3.
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Soviet Inventions Illustrated, Section El, Jan. 6, 1982, week D47, Derwent Publications Ltd., London, SU-800-917, (Rudoi).
Extance Philip
Jones Roger E.
Martin Stewart O.
Mueller Robert W.
Standard Telephones and Cables Public Limited Company
Strecker Gerard R.
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