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Reducing the Effect of Surface Emissivity Variation in Eddy Current Pulsed Thermography

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.

Publication metadata

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


DOI: 10.1109/JSEN.2013.2294195


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Funder referenceFunder name
Newcastle University, U.K.
University of Electronic Science and Technology of China
2007DA10512711415State Key Laboratory of Power Transmission Equipment and System Security and New Technology, Chongqing University
61102141National Natural Science Foundation of China
ZYGX2012YB029Fundamental Research Funds for the Central Universities