| 摘要 |
PROBLEM TO BE SOLVED: To provide a magnetic substance concentration measuring instrument and a magnetic substance concentration measuring method, which measure precisely a concentration of a magnetic substance and also measure continuously the very low concentration of the magnetic substance in a fluid. SOLUTION: The magnetic substance concentration measuring instrument provided with: an excitation coil 11a; and an output coil 11b for generating an excitation voltage when an alternating current flows through the excitation coil 11a, has a measuring means 6 for measuring a change of a phase difference between a voltage of the excitation coil 11a and a voltage of the output coil 11b, and measures the concentration of the magnetic substance, based on the change of the phase difference generated when an inspection object is approached to the excitation coil 11a or/and the output coil 11b. COPYRIGHT: (C)2008,JPO&INPIT
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