A Study of PEC Techniques for Evaluation of Multi-latered Conductive Structures

초록

Under frame side sill in rolling stocks is designed for preventing corrosion in order to meet mechanical requirements. However during long operation time more than 25 years, there are corrosion in the under frame side sill caused by environmental effect, vibration and etc. So, detection of the corrosion in the under frame is one of important issues to extend their life time. Unfortunately, convertible ultrasonic and eddy current techniques are not proper to detect corrosion and thickness variation under the layer media, because the under frame is multi-layered conductive structures and including air gap. However, the pulsed eddy current (PEC) method can be measure thickness in the multi-layered conductive structures. Therefore, in this paper, we measured thickness of the multilayer specimens using the developed PEC probe.