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Metals 2016, 6(8), 172; doi:10.3390/met6080172

Review of Electromagnetic-Based Crack Sensors for Metallic Materials (Recent Research and Future Perspectives)

School of Electrical and Electronics Engineering, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 156-756, Korea
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Author to whom correspondence should be addressed.
Academic Editors: João Manuel R.S. Tavares and Victor Hugo C. de Albuquerque
Received: 20 May 2016 / Revised: 8 July 2016 / Accepted: 20 July 2016 / Published: 25 July 2016

Abstract

Evaluation and non-destructive identification of stress-induced cracks or failures in metals is a vital problem in many sensitive environments, including transportation (steel railway tracks, bridges, car wheels, etc.), power plants (steam generator tubing, etc.) and aerospace transportation (landing gear, aircraft fuselages, etc.). There are many traditional non-destructive detection and evaluation techniques; recently, near-field millimeter waves and microwave methods have shown incredible promise for augmenting currently available non-destructive techniques. This article serves as a review of developments made until now on this topic; it provides an overview of microwave scanning techniques for crack detection. This article summarizes the abilities of these methods to identify and evaluate cracks (including describing their different physical properties). These methods include applying filters based on dual-behavior resonators (DBRs), using complementary split-ring resonators (CSRRs) for the perturbation of electric fields, using waveguide probe-loaded CSRRs and using a substrate-integrated-waveguide (SIW) cavity for the detection of sub-millimeter surface and subsurface cracks. View Full-Text
Keywords: microwave sensor; crack; millimeter waves; dual-behavior resonators; split-ring resonators; substrate-integrated-waveguide microwave sensor; crack; millimeter waves; dual-behavior resonators; split-ring resonators; substrate-integrated-waveguide
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Memon, M.U.; Lim, S. Review of Electromagnetic-Based Crack Sensors for Metallic Materials (Recent Research and Future Perspectives). Metals 2016, 6, 172.

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