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Analysis of the Eddy Current Signal due to Defects on a Railway
New Phys.: Sae Mulli 2019; 69: 361~368
Published online April 30, 2019;
© 2019 New Physics: Sae Mulli.

Taek-Gyu LEE1, Yun-Taek YEOM1, Hak-Joon KIM1, Sung-Jin SONG1, Se-Gon KWON2,  Sung-Duk KWON*3

1School of Mechanical Engineering, Sungkyunkwan University, Suwon 16419, Korea
2Korea Railroad Corp., Deajeon 34618, Korea
3Department of Physics, Andong National University, Andong 36729, Korea
Correspondence to:
Received December 6, 2018; Revised January 2, 2019; Accepted January 2, 2019.
cc This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Eddy current testing (ECT) is widely used as a non-destructive evaluation technique for the detection of surface defects on an object and the evaluation of its material properties. Eddy current trajectory detection can detect surface defects on an object by measuring the impedance change in an induction coil. In this study, an eddy current inspection technique was applied to detect defects in a railway. A 16-channel plus point ECT sensor and a jig were fabricated to inspect the entire surface by using eddy current testing. Eddy current scanning data from on artificial defect specimen were measured. An improved 2D image was obtained through signal processing, such as denoising, detrending and normalization. Also, an attempt was made to evaluate the size (width and depth) of the surface defects on a railway from Eddy current data.
PACS numbers: 81.70.Ex
Keywords: Railway, Eddy current, Denoising, Detrending

April 2019, 69 (4)
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