Improvement of Crack Detection Probability by Using Magnetic Camera and Image Processing


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Magnetic camera consists of magnetic source, arrayed small magnetic sensors, magnetic lens, analog-to-digital converter and interface, computer and monitor. The quantitative magnetic field around crack and its processed results could be obtained by using magnetic camera, and the crack could be inspected and evaluated quantitatively. In addition, the magnetic camera has to uphold with large lift-off to protect sensors from weak environment such as high temperature and mechanical vibration. However, the sensor sensitivity would be decreased when the lift-off was increased. Correspondingly, the improved techniques are necessary for increasing sensitivity of magnetic camera and probability of crack detection at the large lift-off. This paper proposes an image processing method, which separates a global full scale to the several regions and repeats shadings in each region, to increase a crack detection probability in the magnetic camera images such as ∂B/∂x and ∂2B/∂x∂y.



Key Engineering Materials (Volumes 353-358)

Edited by:

Yu Zhou, Shan-Tung Tu and Xishan Xie




S. H. Choi et al., "Improvement of Crack Detection Probability by Using Magnetic Camera and Image Processing", Key Engineering Materials, Vols. 353-358, pp. 2375-2378, 2007

Online since:

September 2007




[1] J. Lee, W. Choe, M. Kim, D. Kim and M. Kang, U.S. Patent 6, 683, 452 B2. (2004).

[2] J. Lee, J. Hwang, K. Lee and S. Choi: Key Engineering Materials Vol. 306-308 (2006), p.235.

[3] J. Lee, D. Seo and T. Shoji: Key Engineering Materials Vol. 270-273 (2004), p.630.

[4] J. Lee and J. Hwang: Key Engineering Materials Vol. 321-323 (2006), p.1447.

[5] J. Lee, J. Hwang, S. Choi and J. Lim: Key Engineering Materials Vol. 241-246 (2005), p.231.

[6] J. Hwang and J. Lee: Proc. ICCAS2005 (2005), p.1830.

[7] J. Lee, J. Hwang, and S. Choi: Int. Journal of Mod. Phs. B (2006), in press.