Quantitative determination of a subsurface defect of reference specimen by lock-in infrared thermography

被引：86

作者：

Choi, Manyong ^{[2
]}

Kang, Kisoo ^{[2
]}

Park, Jeonghak ^{[2
]}

Kim, Wontae ^{[3
]}

Kim, Koungsuk ^{[1
]}

机构：

[1] Chosun Univ, Dept Mech Design Engn, Chosan, South Korea

[2] Korea Res Inst Stand & Sci, Safety Metrol Grp, Taejon, South Korea

[3] Kongju Natl Univ, Dept Biomech Engn, Kong Ju, South Korea

来源：

NDT & E INTERNATIONAL | 2008年 / 41卷 / 02期

关键词：

infrared thermography; lock-in; shearing phase; quantification; defect size;

D O I：

10.1016/j.ndteint.2007.08.006

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

This paper describes the quantitative determination of the sizes and locations of subsurface defects using lock-in infrared thermography. A phase (or temperature) difference between the defect area and the healthy area indicates the qualitative location and size of the defect. To accurately estimate these parameters, the shearing-phase technique has been employed, where the inspected image is shifted by a certain number of pixels to obtain a shifted image while subtraction of one image from the other gives the shearing-phase distribution. The shearing-phase distribution has maximum, minimum, and zero points that help determine quantitatively the size and location of the subsurface defect. Experimental results for a steel plate with artificial subsurface defects show good agreement with actual values. (c) 2007 Elsevier Ltd. All rights reserved.

引用

页码：119 / 124

页数：6

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