Abstract
The rail under high pressure work will grow damage. In the high-speed railway, defects development initially manifests as opening diagonal defects on the surface and buried defects near surface of the rail, and the existing non-destructive testing (NDT) methods find it difficult to achieve comprehensive detection and assessment of rail surface and near surface defects. This paper proposes a multi-frequency excitation composited electromagnetic detection based on different detection characteristic of the system, which can be used to achieve comprehensive assessment of rail surface and near-surface defects. A high-speed rail experimental system is designed to implement experimental analysis which finds that the system can effectively improve the accuracy, anti-interference and stability of surface defect assessment, and realize the quantitative assessment of buried defects. And the multi-frequency composited electromagnetic detection method can also suppress the attenuation of eddy current signal at high speed and improve the signal-to-noise ratio.
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