Low-power magnetometer circuit with constant current drive

Details Low-power magnetometer circuit with constant current drive Low-power magnetometer circuit with constant current drive

1978-09-29

1981-07-07

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Magnetometers

33361, G01R 3304, G01C 1728

Patent

active

042777518

ABSTRACT:
The drive signal applied to the drive winding of a magnetometer is provided by a voltage controlled oscillator. The average current flowing through the drive winding is monitored, and a signal representative of the average current is applied to the input of the voltage control oscillator. The sense windings of the magnetometer are connected to a servo-loop which causes a current to flow in the sense windings which produces a magnetic field cancelling the sensed components of the earth's magnetic field. The magnetometer uses a drive signal which saturates the core for only a short duration of time thereby reducing the power required by the magnetometer while ensuring complete saturation of the core.

REFERENCES:
patent: 3509424 (1970-04-01), Inouye
patent: 3626280 (1971-12-01), Van Englehoven et al.
patent: 3678593 (1972-07-01), Baker et al.
patent: 3696518 (1972-10-01), Leat
patent: 3936949 (1976-02-01), Devaud
"Tech Brief 70-10345 Two Axis Flux Gate Magnetometer" NASA Technical Support Package No. TSP 70-10345, 1970.
T. R. Sanderson, "A Three-Axis Magnetometer with Digital Readout, Suitable for Balloon Borne Apparatus" 1972, Nuclear Instruments and Methods No. 105, pp. 371-376.

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