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Analysis of Eddy Current Signal of Defects on Railway
New Phys.: Sae Mulli
Published online January 3, 2019;  https://doi.org/10.3938/NPSM.0.0
© 2019 New Physics: Sae Mulli.

Taek-Gyu Lee, Yun-Taek Yeom, Hak-Joon Kim, Sung-Jin Song, Se-Gon Kwon, Sung-Duk Kwon*
Received December 6, 2018; Accepted January 2, 2019.
Abstract
Eddy current testing (ECT) is widely used as a non-destructive evaluation technique for surface defect detection and material property evaluation of an object. Eddy current trajectory detection can detect surface defects of an object by measuring the impedance change of the induction coil. In this study, eddy current inspection technique was applied to detect defects in railway. 16 channel plus point ECT sensor and a jig were fabricated to inspect the entire surface using the eddy current testing. Eddy current scanning data were measured from the artificial defect specimen. The improved 2D image was obtained through signal processing such as denoising, detrending and normalization. It was also tried to evaluate surface defect size(width and depth) of railway from Eddy current data.


March 2019, 69 (3)
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