Multiphysics Structured Eddy Current and Thermography Defects Diagnostics System in Moving Mode

Haoran Li, Bin Gao*, Ling Miao, Dong Liu, Qiuping Ma, Gui Yun Tian, Wai Lok Woo

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Abstract

Eddy current testing (ET) and eddy current thermography (ECT) are both important non-destructive testing (NDT) methods that have been widely used in the field of conductive materials evaluation. Conventional ECT systems have often employed to test static specimens eventhough they are inefficient when the specimen is large. In addition, the requirement of high-power excitation sources tends to result in bulky detection systems. To mitigate these problems, a moving detection mode of multiphysics structured ET and ECT is proposed in which a novel L-shape ferrite magnetic yoke circumambulated with array coils is designed. The theoretical derivation model of the proposed method is developed which is shown to improve the detection efficiency without compromising the excitation current by ECT. The specimens can be speedily evaluated by scanning at a speed of 50-250 mm/s while reducing the power of the excitation current due to the supplement of ET. The unique design of the excitation-receiving structure has also enhanced the detectability of omnidirectional cracks. Moreover, it does not block the normal direction visual capture of the specimens. Both numerical simulations and experimental studies on different defects have been carried out and the obtained results have shown the reliability and detection efficiency of the proposed system.
Original languageEnglish
Pages (from-to)2566-2578
Number of pages12
JournalIEEE Transactions on Industrial Informatics
Volume17
Issue number4
Early online date26 May 2020
DOIs
Publication statusPublished - 1 Apr 2021

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