Low-power magnetometer circuit with constant current drive
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United States of America Patent
Stats
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Jul 7, 1981
Grant Date -
N/A
app pub date -
Sep 29, 1978
filing date -
Sep 29, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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