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      Wireless displacement sensing enabled by metamaterial probes for remote structural health monitoring

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      Author
      Ozbey, B.
      Unal, E.
      Ertugrul, H.
      Kurc, O.
      Puttlitz, C. M.
      Erturk, V. B.
      Altintas, A.
      Demir, Hilmi Volkan
      Date
      2014-01-17
      Source Title
      Sensors
      Print ISSN
      1424-8220
      Publisher
      Multidisciplinary Digital Publishing Institute
      Volume
      14
      Issue
      1
      Pages
      1691 - 1704
      Language
      English
      Type
      Article
      Item Usage Stats
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      Abstract
      We propose and demonstrate a wireless, passive, metamaterial-based sensor that allows for remotely monitoring submicron displacements over millimeter ranges. The sensor comprises a probe made of multiple nested split ring resonators (NSRRs) in a double-comb architecture coupled to an external antenna in its near-field. In operation, the sensor detects displacement of a structure onto which the NSRR probe is attached by telemetrically tracking the shift in its local frequency peaks. Owing to the NSRR's near-field excitation response, which is highly sensitive to the displaced comb-teeth over a wide separation, the wireless sensing system exhibits a relatively high resolution (<1 mu m) and a large dynamic range (over 7 mm), along with high levels of linearity (R-2 > 0.99 over 5 mm) and sensitivity (>12.7 MHz/mm in the 1-3 mm range). The sensor is also shown to be working in the linear region in a scenario where it is attached to a standard structural reinforcing bar. Because of its wireless and passive nature, together with its low cost, the proposed system enabled by the metamaterial probes holds a great promise for applications in remote structural health monitoring.
      Keywords
      Displacement Sensor
      Metamaterial
      Structural Health Monitoring
      Permalink
      http://hdl.handle.net/11693/11087
      Published Version (Please cite this version)
      http://dx.doi.org/10.3390/s140101691
      Collections
      • Department of Electrical and Electronics Engineering 3601
      • Department of Physics 2332
      • Institute of Materials Science and Nanotechnology (UNAM) 1841
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