Article (Scientific journals)
Robust Principal Component Thermography for Defect Detection in Composites
Ebrahimi, Samira; Fleuret, Julien; Klein, Matthieu et al.
2021In Sensors, 21, p. 2682
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Keywords :
Nondestructive testing; thermography; composite materials; Contrôle non destructif; thermographie; matérieaux composites
Abstract :
[en] Pulsed Thermography (PT) data are usually affected by noise and as such most of the research effort in the last few years has been directed towards the development of advanced signal processing methods to improve defect detection. Among the numerous techniques that havebeen proposed, principal component thermography (PCT)—based on principal component analysis (PCA)—is one of the most effective in terms of defect contrast enhancement and data compression. However, it is well-known that PCA can be significantly affected in the presence of corrupted data (e.g., noise and outliers). Robust PCA (RPCA) has been recently proposed as an alternative statistical method that handles noisy data more properly by decomposing the input data into a low-rank matrix and a sparse matrix. We propose to process PT data by RPCA instead of PCA in order to improve defect detectability. The performance of the resulting approach, Robust Principal Component Thermography (RPCT)—based on RPCA, was evaluated with respect to PCT—based on PCA, using a CFRP sample containing artificially produced defects. We compared results quantitatively based on two metrics, Contrast-to-Noise Ratio (CNR), for defect detection capabilities, and the Jaccard similarity coefficient, for defect segmentation potential. CNR results were on average 40% higher for RPCT than for PCT, and the Jaccard index was slightly higher for RPCT (0.7395) than for PCT (0.7010). In terms of computational time, however, PCT was 11.5 times faster than RPCT. Further investigations are needed to assess RPCT performance on a wider range of materials and to optimize computational time.
Research center :
STAR - Space sciences, Technologies and Astrophysics Research - ULiège
Disciplines :
Physics
Author, co-author :
Ebrahimi, Samira;  Université Laval > Department of Electrical and Computer Engineering > Computer Vision and Systems laboratory
Fleuret, Julien;  Université Laval > Department of Electrical and Computer Engineering > Computer Vision and Systems laboratory
Klein, Matthieu;  Visiooimage
Théroux, Louis-Daniel;  Centre Technologique en Aérospatial (CTA)
Georges, Marc ;  Université de Liège - ULiège > CSL (Centre Spatial de Liège)
Ibarra-Castanedo, Clemente;  Université Laval > Department of Electrical and Computer Engineering > Computer Vision and Systems laboratory
Maldague, Xavier;  Université Laval > Department of Electrical and Computer Engineering > Computer Vision and Systems laboratory
Language :
English
Title :
Robust Principal Component Thermography for Defect Detection in Composites
Publication date :
10 April 2021
Journal title :
Sensors
ISSN :
1424-8220
eISSN :
1424-3210
Publisher :
Multidisciplinary Digital Publishing Institute (MDPI), Switzerland
Volume :
21
Pages :
2682
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
LDCOMP
Funders :
Service public de Wallonie. Secrétariat général - SPW-SG
Available on ORBi :
since 11 April 2021

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