| 摘要 |
PROBLEM TO BE SOLVED: To provide a high-accuracy and stable magnetometric sensor by eliminating fluctuations in magnetism detection sensitivity, with reference to temperature changes. SOLUTION: A high-frequency current is applied from a high-frequency signal source 4 to an MI element 1 using a magnetic impedance effect, a bias magnetic field is applied from a bias signal source 5 via a coil 2, a smoothing value of a terminal voltage at the element 1 is obtained by an analog storage circuit 7, an external magnetic field correspondence value is fetched via a buffer circuit 8, analog storage circuits 11, 12 and a differential circuit 13, a temperature resistance element 10 used to detect a temperature of the MI element 1 is added, the bias magnetic field applied to the element 1 is adjusted according to a temperature detection value, and influence due to temperature drift is suppressed. COPYRIGHT: (C)2003,JPO
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