MATERIAL CHARACTERISTICS MEASUREMENT METHOD, TRANSFORMATION STATE MEASUREMENT METHOD, MATERIAL CHARACTERISTICS MEASUREMENT DEVICE, AND TRANSFORMATION STATE MEASUREMENT DEVICE FOR MAGNETIC MATERIAL
PROBLEM TO BE SOLVED: To provide a material characteristics measurement method for a magnetic material which is unaffected by a crystal grain diameter, a solid solution amount, a deposition amount, or dislocation density of a measured material. SOLUTION: A measured steel plate 1 is magnetized with direct current to a rotating magnetized region by means of a direct current magnetizing device 2 and a direct current magnetizing coil 6. An alternating current magnetic field is added to the measured steel plate 1, by means of an alternating current magnetizing device 3 and an alternating current magnetizing coil 7. A magnetic core 5 is used is common for direct current magnetization and alternating current magnetization. By means of an alternating current magnetic field detector 4, an alternating current magnetic field in the surface direction on the surface of the measured steel plate 1 is detected. By means of a lock-in amplifier 8, the detected alternating current magnetic filed signal and the alternating current magnetized signal are detected synchronously and noise constituents are eliminated, and consequently, intensity of the alternating current magnetic field is detected with high sensitivity. From the detected alternating current magnetic signal intensity, material characteristics are computed and found in a signal processor 9.
