抄録
The conventional eddy current nondestructive testing using pancake probe is prone to suffer from various noise generated by variation of many factors such as probe lift-off and material electromagnetic characteristics. Thus when the conventional eddy current nondestructive testing is applied to maintenance inspection of weld zone, it is difficult to detect the flaw in weld zone because of the noise generated by the shape change and electromagnetic characteristic change of the weld zone. The authors tried the eddy current nondestructive testing of weld zone using uniform eddy current probe that consists of a wide tangential exciting coil and differential tangential detector coils in order to reduce the noise by weld zone. The experimental results have proved that the uniform eddy current probe has a high signal-to-noise ratio compared to the conventional pancake eddy current probe when it is applied to detecting flaws in weld zone.
