Multiple-coil magnetic field sensor with series-connected main c

Details Multiple-coil magnetic field sensor with series-connected main c Multiple-coil magnetic field sensor with series-connected main c

1991-03-20

1992-07-14

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Magnetometers

324247, 324339, 324346, G01V 328, G01V 310, G01R 3302

Patent

active

051306557

ABSTRACT:
A borehole magnetic sensor includes a plurality of primary detector coils, aligned along parallel axes, and connected in series with each other. A corresponding plurality of feedback coils, each associated with a respective detector coil, are arranged to cooperate with an amplifier system to provide negative feedback and null the magnetic field through the detector coils. The feedback coils are connected in parallel.

REFERENCES:
patent: 3187252 (1965-06-01), Hungerford
patent: 3528402 (1970-09-01), Abramowitz
patent: 4636731 (1987-01-01), Savage et al.
patent: 4719420 (1988-01-01), Boimond
G. Clerc et al., "La cotre-reaction de flux applique aux . . .", Extract des Annales de Geophysique, Tome 20, n4 (Oct.-Dec. 1964).
"BF Series Magnetic Field Sensors", Electromagnetic Instruments Inc. (EMI). Brochure Dec. 14, 1990.

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