National University Corporation Okayama University
发明人:
TSUKADA Keiji
申请号：
EP20100793942
公开号：
EP2450700(B1)
申请日:
2010.05.28
申请国别(地区):
欧洲专利局
年份:
2018
代理人:
摘要：
[Object] In a magnetic flux leakage inspection method, a method for magnetic flux leakage inspection for measurement and analysis that can accurately capture a true signal due to a defect with a measurement result unaffected by a change of a measurement condition. [Means of Realizing the Object] A magnetic flux leakage inspection method generates a magnetic flux parallel to a surface of an inspected object, and detects a magnetic flux that leaks from the surface of the inspected object with a magnetic sensor. The magnetic flux leakage inspection method includes exciting coils that generate an alternating magnetic field having a variable frequency, an exciting coil power source, the magnetic sensor that detects a component horizontal to a magnetic field leaked from the surface of the inspected object, a lock-in detector that detects signals having the same frequency as the exciting coils from an output from the measuring circuit of the magnetic sensor, and a signal analyzer that analyzes changes of a signal i
