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Lookup NU author(s): Professor Gui Yun TianORCiD
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With the development of nondestructive detection, the emerging testing techniques provide new challenges to signal analysis and interpretation approach applied to the inspection evaluation. Some researchers have developed the methods that focus on feature analysis of detected signals. This article presents a new feature analysis by the Independent Component Analysis (ICA) approach to evaluate the defects tested by the pulsed eddy current (PEC) technique. ICA is a high-order statistics technique used to separate multi-unknown sources, which has been successfully applied to facial image identification and separation of the components of 1D signal. In this article, the ICA approach is utilized to project the response signals of various defects into the independent components (ICs) feature subspace by signal representation model. Dependent on the selected ICs, each defect is represented by different projected coefficients, which are proposed to discriminate and classify the defects that belong to three categories. The improved ICA model is proposed to improve the classification of two similar categories of single defects: metal loss and subsurface defects. The evaluation using the series of experimental data has validated the classification of single defects and the defects with lift-off effect by our ICA approach. The comparison with Principal component analysis (PCA)-based approach further verified the better performance of the ICA-based model.
Author(s): Yang G, Tian GY, Que PW, Chen TL
Publication type: Article
Publication status: Published
Journal: Research in Nondestructive Evaluation
Year: 2009
Volume: 20
Issue: 4
Pages: 230-245
ISSN (print): 0934-9847
ISSN (electronic): 1432-2110
Publisher: Taylor & Francis Inc.
URL: http://dx.doi.org/10.1080/09349840903078996
DOI: 10.1080/09349840903078996
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