Crack Evaluation Based on Novel Circle-Ferrite Induction Thermography

Jian Zhao, Bin Gao, Wai Lok Woo, Fasheng Qiu, Gui Yun Tian

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

Nondestructive inspection of rolling contact and stress corrosion cracks is a critical important research area in both science and technology industry to evaluate the properties of a product. This paper proposes a novel system of circle-ferrite pulsed inductive thermography for cracks inspection. The new sensing structure consists of several promising characteristics. It significantly enhances the detectability of omnidirectional micro cracks, and provides larger detection area with non-geometry influence. In addition, unlike common inductor, the proposed structure imposes uniform toroidal electromagnetic thermal fields, so that both sensitivities of detection rate and the detectable area can be simultaneously improved. This overcomes the problem of in-homogenous heating, and increases the thermal contrast between directional defective and non-defective region. The theoretical derivation based on magnetic circuit principles has been developed for analysis and interpretation of the results. In addition, both simulation experiments and tests on artificial and nature cracks sample have been conducted to show the reliability and efficiency of the proposed system.
Original languageEnglish
Pages (from-to)5637-5645
Number of pages9
JournalIEEE Sensors Journal
Volume17
Issue number17
Early online date4 Jul 2017
DOIs
Publication statusPublished - 1 Sep 2017

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