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Comparative analysis of eddy current pulsed thermography and long pulse thermography for damage detection in metals and composites

Lookup NU author(s): Junzhen Zhu, Professor Gui Yun TianORCiD



This is the authors' accepted manuscript of an article that has been published in its final definitive form by Elsevier Ltd, 2019.

For re-use rights please refer to the publisher's terms and conditions.


© 2019 Elsevier LtdEddy current pulsed thermography (ECPT) and long pulse thermography (LPT) are two emerging non-destructive evaluation techniques that have been recently used for sub-surface defect detection in both metallic and composite components. This paper provides a comparative analysis of these two methods by focussing on the detection of flat bottom holes (FBHs) in both aluminium and carbon fibre reinforced plastic samples. Principal component analysis was used for the post-processing of thermal data in order to enhance the detection of FBHs with various diameters and depths. Results showed that LPT had a better performance for detecting FBHs in low-thermally conductive materials such as carbon fibre-reinforced thermoplastic composites, whilst ECPT revealed a superior performance for detecting FBHs in materials with higher thermal and electrical conductivity such as aluminium.

Publication metadata

Author(s): Wang Z, Zhu J, Tian G, Ciampa F

Publication type: Article

Publication status: Published

Journal: NDT & E International

Year: 2019

Volume: 107

Online publication date: 09/08/2019

Acceptance date: 08/08/2019

Date deposited: 23/10/2019

ISSN (print): 0963-8695

ISSN (electronic): 1879-1174

Publisher: Elsevier Ltd


DOI: 10.1016/j.ndteint.2019.102155


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