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      Wireless sensing in complex electromagnetic media: construction materials and structural monitoring

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      Author
      Özbey, B.
      Demir, Hilmi Volkan
      Kurc, O.
      Ertürk, V. B.
      Altıntaş, A.
      Date
      2015
      Source Title
      IEEE Sensors Journal
      Print ISSN
      1530-437X
      Publisher
      Institute of Electrical and Electronics Engineers Inc.
      Volume
      15
      Issue
      10
      Pages
      5545 - 5554
      Language
      English
      Type
      Article
      Item Usage Stats
      164
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      124
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      Abstract
      In this paper, wireless sensing in the presence of complex electromagnetic media created by combinations of reinforcing bars and concrete is investigated. The wireless displacement sensing system, primarily designed for use in structural health monitoring (SHM), is composed of a comb-like nested split-ring resonator (NSRR) probe and a transceiver antenna. Although each complex medium scenario is predicted to have a detrimental effect on sensing in principle, it is demonstrated that the proposed sensor geometry is able to operate fairly well in all scenarios except one. In these scenarios that mimic real-life SHM, it is shown that this sensor exhibits a high displacement resolution of 1 μm, a good sensitivity of 7 MHz/mm in average, and a high dynamic range extending over 20 mm. For the most disruptive scenario of placing concrete immediately behind NSRR, a solution based on employing a separator behind the probe is proposed to overcome the handicaps introduced by the medium. In order to obtain a one-to-one mapping from the measured frequency shift to the displacement, a numerical fit is proposed and used. The effects of several complex medium scenarios on this fit are discussed. These results indicate that the proposed sensing scheme works well in real-life SHM applications. © 2001-2012 IEEE.
      Keywords
      Complex medium
      Concrete
      Displacement sensor
      Nested split ring resonator (NSRR)
      Reinforcing bar (rebar)
      Strain sensor
      Structural health monitoring (SHM)
      Wireless passive sensor
      Bars (metal)
      Concrete placing
      Concretes
      Optical resonators
      Probes
      Radio transceivers
      Reinforced concrete
      Reinforcement
      Resonators
      Ring gages
      Complex medium
      Displacement sensor
      Passive sensor
      Reinforcing bar
      Split ring resonator
      Strain sensors
      Structural health monitoring (SHM)
      Permalink
      http://hdl.handle.net/11693/20892
      Published Version (Please cite this version)
      http://dx.doi.org/10.1109/JSEN.2015.2441555
      Collections
      • Department of Electrical and Electronics Engineering 3597
      • Department of Physics 2329
      • Institute of Materials Science and Nanotechnology (UNAM) 1831
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