title: Electrical impedance spectroscopy-based defect sensing technique in estimating cracks.
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.
authors.affiliation: Department of Computational Science and Engineering, Yonsei University, Seoul 120-749, Korea. zttouc@hotmail.com.
authors.forename: Tingting
authors.initials: T
authors.lastname: Zhang
authors.affiliation: Department of Computational Science and Engineering, Yonsei University, Seoul 120-749, Korea. zhould1990@hotmail.com.
authors.forename: Liangdong
authors.initials: L
authors.lastname: Zhou
authors.affiliation: Department of Mathematics and Applications, Ecole Normale Supérieure, 45 Rue d'Ulm, 75005 Paris, France. habib.ammari@ens.fr.
authors.forename: Habib
authors.initials: H
authors.lastname: Ammari
authors.affiliation: Department of Computational Science and Engineering, Yonsei University, Seoul 120-749, Korea. seoj@yonsei.ac.kr.
authors.forename: Jin Keun
authors.initials: JK
authors.lastname: Seo
keywords: concrete cracks; defect sensing; impedance spectroscopy; inverse problem