| 摘要 |
PROBLEM TO BE SOLVED: To provide an inexpensive magnetic substance amount detector capable of detecting a magnetic signal proportional to a magnetic substance amount by one magnetic head having a primary coil and a secondary coil, an excitation circuit, and a processing circuit. SOLUTION: This magnetic substance amount detecting system for detecting a magnetic substance in a detected medium 1 has the magnetic head 10 provided with the primary coil 11 and the secondary coil 12, a means 20 for supplying an alternating current to the primary coil 11 of the magnetic head 10, and a means for detecting a current in the primary coil 11. An amplitude and a phase of a detected signal are associated with a phase of an output signal from the secondary coil 12 to remove an alternating current component by the alternating current by a differential amplifier 42. COPYRIGHT: (C)2005,JPO&NCIPI
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