UCHIHASHI ESTEC CO LTD;TOHOKU ELECTRIC POWER CO INC
发明人:
MURANAGA YOSUKE,IZAWA KAZUYUKI
申请号：
JP20050158753
公开号：
JP2006337041(A)
申请日:
2005.05.31
申请国别(地区):
日本
年份:
2006
代理人:
摘要：
PROBLEM TO BE SOLVED: To properly detect flaws of a magnetic metal body, using a magnetic impedance effect type sensor by a leakage magnetic flux flaw detecting test method, and moreover, properly miniaturizing a magnetic detector. SOLUTION: The magnetic detector, which has a coil for applying magnetic field to the metal body and the magnetic impedance effect type sensor for detecting the leaking magnetic flux at the flaw location of the metal body, is moved to the inspection region of the surface of the metal body; while the magnetic field for demagnetization or magnetization is made to act on the inspection region of the surface of the metal body, to uniformize the magnetized state of the metal body and the surface of the metal body is scanned by the magnetic detector, while applying a flaw-detecting magnetic field to the surface of the metal body by the coil, to detect the flaw of the metal body by the magnetic impedance effect type sensor. Since the flaw of the metal body is detected by using the magnetic impedance effect type sensor by the leakage magnetic flux flaw detecting test method, after demagnetization or magnetization method, the effect of the leaking magnetic flux noise due to residual magnetism is excluded, and the flaw location of the metal body can be detected with original high sensitivity that is based on the magnetic impedance effect. COPYRIGHT: (C)2007,JPO&INPIT
