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Sensors 2017, 17(7), 1654; https://doi.org/10.3390/s17071654

Enhanced Strain Measurement Range of an FBG Sensor Embedded in Seven-Wire Steel Strands

1
Department of Marine and Civil Engineering, Chonnam National University, Yeosu 59626, Korea
2
Department of Civil and Environmental Engineering, Graduate School, Chonnam National University, Yeosu 59626, Korea
3
INNOSE Tech., Incheon 21990, Korea
4
School of Architecture, Chonnam National University, Gwangju 61186, Korea
*
Author to whom correspondence should be addressed.
Received: 30 May 2017 / Revised: 7 July 2017 / Accepted: 14 July 2017 / Published: 18 July 2017
(This article belongs to the Special Issue Integrated Photonic Technologies for Sensing Applications)
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Abstract

FBG sensors offer many advantages, such as a lack of sensitivity to electromagnetic waves, small size, high durability, and high sensitivity. However, their maximum strain measurement range is lower than the yield strain range (about 1.0%) of steel strands when embedded in steel strands. This study proposes a new FBG sensing technique in which an FBG sensor is recoated with polyimide and protected by a polyimide tube in an effort to enhance the maximum strain measurement range of FBG sensors embedded in strands. The validation test results showed that the proposed FBG sensing technique has a maximum strain measurement range of 1.73% on average, which is 1.73 times higher than the yield strain of the strands. It was confirmed that recoating the FBG sensor with polyimide and protecting the FBG sensor using a polyimide tube could effectively enhance the maximum strain measurement range of FBG sensors embedded in strands. View Full-Text
Keywords: FBG sensor; prestressed concrete; strand; strain; structural health monitoring FBG sensor; prestressed concrete; strand; strain; structural health monitoring
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Kim, J.-M.; Kim, C.-M.; Choi, S.-Y.; Lee, B.Y. Enhanced Strain Measurement Range of an FBG Sensor Embedded in Seven-Wire Steel Strands. Sensors 2017, 17, 1654.

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