| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for inducing a vibration magnetic field inside a magnetic body, a method for measuring the effective magnetic field distribution inside the magnetic body, a method for measuring magnetic body constant, and a method for measuring residue strain in the magnetic body. SOLUTION: Acoustic waves are induced inside a magnetic body 10 by an acoustic wave generator 12, an incident acoustic wave 31 and a reflection acoustic wave 32 interfere each other to form standing waves, and stress is generated at a node C.N. (compressed node) and T.N. (tensile node) of the standing waves. A vibrating anisotropic magnetic field is generated by inverse magnetostriction effect due to the stress, induced electromotive force based on the vibration of the anistropic magnetic field is measured by a coil 17, and the effective magnetic field distribution of the magnetic body 10 is obtained from the induced power, a magnetization curve, and a magnetostriction curve. COPYRIGHT: (C)2004,JPO
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