Paper Title:
Development of Signal Processing Circuit of a Magnetic Camera for the NDT of a Paramagnetic Material
  Abstract

The yoke type magnetization coil and cross type magnetizer as a magnetic source, which induce a static magnetic field on a specimen, have been used to detect cracks on a ferromagnetic material. However, the cracks on paramagnetic materials such as aluminum alloy and stainless steel cannot be detected by using a static magnetic source. This paper proposes a magnetic source, which uses the induced sheet type current, for the detection of cracks on a paramagnetic material. The sheet type AC current can be induced by using a primary coil and core. And the copper film, which includes a sheet type current, is positioned on the specimen. Eddy currents are induced around a crack on the specimen because the secondary sheet type current can be induced on the specimen surface. The signal processing electrical circuits, which measure a Hall sensor peak output with the eddy current frequency, are developed and discussed. Also the validity of the proposed signal processing circuit is verified by detection of slit type cracks and a fatigue crack, which are introduced on aluminum alloy.

  Info
Periodical
Key Engineering Materials (Volumes 353-358)
Edited by
Yu Zhou, Shan-Tung Tu and Xishan Xie
Pages
2379-2382
DOI
10.4028/www.scientific.net/KEM.353-358.2379
Citation
J. W. Jun, J. S. Hwang, K. J. Kim, K. Ogawa, J. Y. Lee, "Development of Signal Processing Circuit of a Magnetic Camera for the NDT of a Paramagnetic Material", Key Engineering Materials, Vols. 353-358, pp. 2379-2382, 2007
Online since
September 2007
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Price
$32.00
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