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Thermography pattern analysis and separation

Lookup NU author(s): Dr Bin Gao, Dr Libing Bai, Dr Wai Lok Woo, Professor Gui Yun TianORCiD

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Abstract

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.

Publication metadata

Author(s): Gao B, Bai LB, Woo WL, Tian GY

Publication type: Article

Publication status: Published

Journal: Applied Physics Letters

Year: 2014

Volume: 104

Issue: 25

Pages: 221902-1-251902-5

Print publication date: 01/01/2014

ISSN (print): 0003-6951

ISSN (electronic): 1077-3118

Publisher: AIP Publishing

URL: http://dx.doi.org/10.1063/1.4884644

DOI: 10.1063/1.4884644

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