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Sensors 2015, 15(5), 10909-10922; doi:10.3390/s150510909

Electrical Impedance Spectroscopy-Based Defect Sensing Technique in Estimating Cracks

1
Department of Computational Science and Engineering, Yonsei University, Seoul 120-749, Korea
2
Department of Mathematics and Applications, Ecole Normale Supérieure, 45 Rue d'Ulm, 75005 Paris, France
*
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M.N. Passaro
Received: 3 February 2015 / Revised: 8 April 2015 / Accepted: 29 April 2015 / Published: 8 May 2015
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [11117 KB, uploaded 8 May 2015]   |  

Abstract

A defect sensing method based on electrical impedance spectroscopy is proposed to image cracks and reinforcing bars in concrete structures. The method utilizes the frequency-dependent behavior of thin insulating cracks: low-frequency electrical currents are blocked by insulating cracks, whereas high-frequency currents can pass through thin cracks to probe the conducting bars. From various frequency-dependent electrical impedance tomography (EIT) images, we can show its advantage in terms of detecting both thin cracks with their thickness and bars. We perform numerical simulations and phantom experiments to support the feasibility of the proposed method. View Full-Text
Keywords: defect sensing; impedance spectroscopy; inverse problem; concrete cracks defect sensing; impedance spectroscopy; inverse problem; concrete cracks
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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

Zhang, T.; Zhou, L.; Ammari, H.; Seo, J.K. Electrical Impedance Spectroscopy-Based Defect Sensing Technique in Estimating Cracks. Sensors 2015, 15, 10909-10922.

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