期刊
NDT & E INTERNATIONAL
卷 42, 期 1, 页码 34-41出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ndteint.2008.08.001
关键词
NDT; Scan-type magnetic camera; Leaked magnetic flux; Linearly integrated Hall sensors array; Express train
资金
- Korea government (MOST) [R01-2005-000-10029-0]
A new and unique nondestructive testing (NDT) system able to detect a crack with high-speed and high spatial resolution, is urgently required for inspecting small cracks on express train wheels. We, in this paper, propose a scan-type magnetic camera, which uses two linearly integrated Hall sensor arrays (LIHaS) on a wafer, and a small yoke-type magnetizer, which is positioned on the back of the LIHaS. Two of the LIHaS (hereafter, differential-type LIHaS) are arrayed in parallel, The differential Hall voltages from each sensor in the scanning direction are obtained and amplified. We can achieve high-speed NDT by using the differential-type LIHaS because of the partial derivative V-H/partial derivative X value, which provides the most important crack information, can be obtained without buffering or calculation. We verified the effectiveness of this new and unique method by examination of cracks in the wheel specimen model. (C) 2008 Elsevier Ltd. All rights reserved.
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