| 摘要 |
PROBLEM TO BE SOLVED: To provide a magnetic sensor capable of easily changing an arranging space for coils used in measurement while securing measuring precision, in the magnetic sensor having the plurality of coils. SOLUTION: This magnetic sensor is provided with a magnetic detecting part 1, and an excitation electric power source 2, a selection circuit 3, a differential amplifier 4 and the like. The magnetic detecting part 1 is provided with an excitation coil 11d, and detecting coils 11a, 11b, 11c, 11e, 11f, 11g. The selection circuit 3 is provided with switches 31a-31g for grounding selectively one-sides of the coils 11a-11g when detecting a defect. The selection circuit 3 is provided also with switching switches 32a-32f for selecting the prescribed two coils out of the detecting coils, when detecting the defect, for guiding detection signals of the selected two coils to an input side of the differential amplifier 4, and for short-circuiting both ends of the respective coils under a floating condition, as to the residual coils not selected therein. COPYRIGHT: (C)2006,JPO&NCIPI
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