| 摘要 |
PROBLEM TO BE SOLVED: To provide a geomagnetic sensor device that compensates variation of a scalefactor of a magnetic sensor output in a wide temperature range. SOLUTION: The geomagnetic sensor device is a flux gate type one consisting of an exciting coil wound around a magnetic substance core and of a detecting coil. The device has an exciting part which supplies an exciting current to the exciting coil, a resonance circuit part which forms a resonance circuit, connected with the detecting coil, and detects a frequency signal output by a geomagnetic sensor part of a flux gate type, a synchronous detection part which conducts synchronous detection of an output signal of the resonance circuit part, a carrier signal generating part which generates a carrier signal of an alternating current signal and an integrating part which integrates an output signal of the synchronous detection part and the carrier signal. The integrating part includes an integrator and a feedback means for compensating a gain change of the integrator. COPYRIGHT: (C)2009,JPO&INPIT
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