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Sensors 2016, 16(4), 496; doi:10.3390/s16040496

A Wireless Passive Sensing System for Displacement/Strain Measurement in Reinforced Concrete Members

1
Department of Electrical and Electronics Engineering, Bilkent University, 06800, Ankara, Turkey
2
School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore
3
Department of Civil Engineering, Middle East Technical University, Ankara TR-06800, Turkey
*
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 8 February 2016 / Revised: 27 March 2016 / Accepted: 30 March 2016 / Published: 8 April 2016
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [11186 KB, uploaded 8 April 2016]   |  

Abstract

In this study, we show a wireless passive sensing system embedded in a reinforced concrete member successfully being employed for the measurement of relative displacement and strain in a simply supported beam experiment. The system utilizes electromagnetic coupling between the transceiver antenna located outside the beam, and the sensing probes placed on the reinforcing bar (rebar) surface inside the beam. The probes were designed in the form of a nested split-ring resonator, a metamaterial-based structure chosen for its compact size and high sensitivity/resolution, which is at µm/microstrains level. Experiments were performed in both the elastic and plastic deformation cases of steel rebars, and the sensing system was demonstrated to acquire telemetric data in both cases. The wireless measurement results from multiple probes are compared with the data obtained from the strain gages, and an excellent agreement is observed. A discrete time measurement where the system records data at different force levels is also shown. Practical issues regarding the placement of the sensors and accurate recording of data are discussed. The proposed sensing technology is demonstrated to be a good candidate for wireless structural health monitoring (SHM) of reinforced concrete members by its high sensitivity and wide dynamic range. View Full-Text
Keywords: wireless passive sensors; metamaterial based sensors; structural health monitoring; simply supported beam experiment; elastic-plastic deformation of steel; strain measurement; displacement measurement wireless passive sensors; metamaterial based sensors; structural health monitoring; simply supported beam experiment; elastic-plastic deformation of steel; strain measurement; displacement measurement
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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

Ozbey, B.; Erturk, V.B.; Demir, H.V.; Altintas, A.; Kurc, O. A Wireless Passive Sensing System for Displacement/Strain Measurement in Reinforced Concrete Members. Sensors 2016, 16, 496.

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