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Lookup NU author(s): Dr Libing Bai, Professor Gui Yun TianORCiD
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Manually selected frames have been used for both defect detection and quantification in Eddy current pulsed thermography. Defects are indicated by high/low temperatures within frames. However, variation of surface emissivity sometimes introduces illusory temperature inhomogeneity and results in detection false alarms. To improve the probability of detection, this paper proposes a two heat balance states-based method. For each pixel, a surface emissivity coefficient is extracted from the two heat balance states and is used to correct the transient response. The temperature and emissivity is thus separated. A verified experiment was carried out on a steel sample having both a polished and black strip painted surface, and the image quality was improved significantly.
Author(s): Bai LB, Tian SL, Cheng YH, Tian GY, Chen YF, Chen K
Publication type: Article
Publication status: Published
Journal: IEEE Sensors Journal
Year: 2014
Volume: 14
Issue: 4
Pages: 1137-1142
Print publication date: 11/12/2013
ISSN (print): 1530-437X
ISSN (electronic): 1558-1748
Publisher: IEEE
URL: http://dx.doi.org/10.1109/JSEN.2013.2294195
DOI: 10.1109/JSEN.2013.2294195
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