| 摘要 |
PROBLEM TO BE SOLVED: To provide a highly sensitive and highly accurate magnetic field sensor constructible out of a simple electronic circuit wherein an induced voltage becomes zero when a magnetic field imposed thereon is zero and the response thereof to the magnetic field is linear. SOLUTION: This sensor has a magnetic wire 1 and a detection coil 2 wound around the wire 1. A voltage induced in the detection coil 2 by passing an AC exciting current through the magnetic wire 1 is used as a detection output. A DC bias voltage is superimposed on the exciting current and the output is taken out from an excitation frequency component included in the induced voltage. A tubular magnetic body can be used in place of the magnetic wire 1, the magnetic wire can be an amorphous magnetic wire of non- magnetostrictive composition, or the magnetic wire can have slightly negative magnetostriction.
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