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Lookup NU author(s): Dr Bin Gao,
Dr Libing Bai,
Dr Wai Lok Woo,
Professor Gui Yun TianORCiD
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Analysis of thermography spatial-transient patterns has considerable potential to enable automatic identification and quantification of defects in non-destructive testing and evaluation. This Letter proposes a non-negative pattern separation model for eddy current pulsed thermography to automatically extract important spatial and time patterns according to the transient thermal sequences without any pre-training or prior knowledge. In particular, the method is scale-invariant, such that large differences in surface emissivity, hot spots, and cool areas with dynamic range of thermal contrast can be extracted. Finally, an artificial slot in a steel sample with shining, black strip on the surface is tested to validate the proposed method. (C) 2014 AIP Publishing LLC.
Author(s): Gao B, Bai LB, Woo WL, Tian GY
Publication type: Article
Publication status: Published
Journal: Applied Physics Letters
Print publication date: 01/01/2014
ISSN (print): 0003-6951
ISSN (electronic): 1077-3118
Publisher: AIP Publishing
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