Intermittently activated magnetic shield arrangement for reducing noise and offsets in solid state magnetic field sensors
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United States of America Patent
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Oct 16, 1990
Grant Date -
N/A
app pub date -
Aug 24, 1989
filing date -
Sep 13, 1988
priority date (Note) -
Expired
status (Latency Note)
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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.
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