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Quantitative validation of Eddy current stimulated thermal features on surface crack

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


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Thermography is an established technique in Non-Destructive Testing and Evaluation (NDT & E) for detecting and visualizing defects. The acquired thermal image sequences contain valuable information in the spatial, time and frequency domains. Many thermal feature extraction methods have been previously proposed to detect and quantify defects. However, the quantitative assessment and error analysis remain as challenges. In the present work, a quantitative analysis strategy is proposed for validating detection performance of various thermal feature extraction techniques based on Eddy Current Stimulated Thermography. F-score is adopted as a global quantitative evaluation indicator to assess the crack detectability. The quantitative validation is carried out based on a large number of simulations and experiments for cracks on the nonferromagnetic material. The detectability in relation to the variations in crack size and the different thermal feature extraction methods have been critically analyzed. The insights obtained from the present findings can serve as guidelines to other types of thermal-based NDT & E to improve the defect visibility and detectability.

Publication metadata

Author(s): Gao B, Li XQ, Woo WL, Tian GY

Publication type: Article

Publication status: Published

Journal: NDT & E International

Year: 2017

Volume: 85

Pages: 1-12

Print publication date: 01/01/2017

Online publication date: 20/09/2016

Acceptance date: 12/09/2016

ISSN (print): 0963-8695

ISSN (electronic): 1879-1174

Publisher: Elsevier Science Ltd.


DOI: 10.1016/j.ndteint.2016.09.002


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Funder referenceFunder name
136413China Postdoctoral Science Foundation
269202FP7 HEMOW IRSES project
51377015National Natural Science Foundation of China
61401071National Natural Science Foundation of China
61527803National Natural Science Foundation of China
ZYGX2014J068Fundamental Research Funds for the Central Universities