| 摘要 |
PROBLEM TO BE SOLVED: To provide a technology for accurately and stably measuring local complex permeability and local crystal grain size of a magnetic body to be measured, even when a measuring object moves relatively with respect to a sensor section. SOLUTION: This magnetic characteristic measuring device winds a coil for alternating current excitation and a coil for detection on a ferromagnetic body core with a U-shaped cross section, closely faces the tip of the leg of the core with the U-shaped cross section to the magnetic body to be measured, and measures the complex permeability of the magnetic body to be measured. In the complex permeability measuring device, leg interval A is determined to establish the equation A≥v/f+2×C and C>0, where v is moving speed of the magnetic body to be measured moving relatively in the arrangement direction of the leg, f is application frequency to the alternating current exciting coil, C is width of a detection sensitivity reduction region between the legs expressed as a function of the predetermined lift off and the leg interval A. COPYRIGHT: (C)2011,JPO&INPIT
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