| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and an apparatus for reducing an effect of an air gap magnetic flux in a detection coil and accurately measuring a hardness of the whole austenite stainless steel material. SOLUTION: The hardness measuring apparatus 1 is provided with an excitation coil 11 disposed so as to surround the measured stainless steel material M, a first detection coil 12 disposed so as to surround the steel material M within the excitation coil 11, and a second detection coil 13 disposed so as to surround an air gap between the excitation coil 11 and the first detection coil 12 within the excitation coil 11. A calculation processor 30 calculates a voltage difference between a voltage induced by the first detection coil 12 and a voltage induced by the second detection coil 13, calculates a magnetic characteristic value of the steel material M based on the calculated voltage difference, and estimates the hardness of the steel material M based on the calculated magnetic characteristic value. COPYRIGHT: (C)2005,JPO&NCIPI
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