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Defect Detection of Wall Thinned Straight Pipe using Shearography and Lock-in Infrared Thermography  

Kim, Kyeong-Suk (Department of Mechanical Engineering, Chosun Univ.)
Jung, Hyun-Chul (Department of Mechanical Engineering, Chosun Univ.)
Chang, Ho-Seob (Laser Center, Chosun Univ.)
Kim, Ha-Sig (Department of Naval Architecture & Mechanics, Chosun College Univ.)
La, Sung-Won (Department of Advanced parts and Materials Engineering, Graduate School, Chosun Univ.)
Publication Information
Journal of the Korean Society for Precision Engineering / v.26, no.11, 2009 , pp. 55-61 More about this Journal
Abstract
The wall thinning defect of nuclear power pipe is mainly occurred by the affect of the flow accelerated corrosion (FAC) of fluid. This type of defect becomes the cause of damage or destruction of in carbon steel pipes. Therefore, it is very important to measure defect which is existed not only on the welding part but also on the whole field of pipe. This study use dual-beam Shearography, which can measure the out-of-plane deformation and the in-plane deformation by using another illuminated laser beam and simple image processing technique. And this study proposes Infrared thermography, which is a two-dimensional non-contact nondestructive evaluation that can detect internal defects from the thermal distribution by the inspection of infrared light radiated from the object surface. In this paper, defect of nuclear power pipe were, measured using dual-beam shearography and infrared thermography, quantitatively evaluated by the analysis of phase map and thermal image pattern.
Keywords
Shearography; Defect Detection; Infrared Thermography; Wall Thinned Pipe;
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