Journal
JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 32, Issue 5, Pages 891-896Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2013.2293120
Keywords
Fibre loop mirror (FLM); optical fibre sensors (OFSs); photonic crystal fibre (PCF); pressure sensor; structural health monitoring (SHM)
Funding
- EU COST Action [TD1001]
- George Daniels Educational Trust
- EPSRC [EP/D030269/1, EP/F012829/1, EP/H029648/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/F012829/1, EP/H029648/1, EP/D030269/1] Funding Source: researchfish
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In this paper, a novel sensing technique has been designed and investigated for the direct, in situ detection of steel corrosion distributed in reinforced concrete structures. At present, structural health monitoring in reinforced concrete structures is generally focused on monitoring the corrosion risk of the reinforcing steel. It is of significant importance, however, to inform industry of both the onset of corrosion and the corrosion rate as these are key contributors to structural degradation and thus evaluating the service life of the structures. This paper aims to address the above challenges by describing a novel corrosion sensor design using birefringent photonic crystal fibres. The technique exploits fully both the birefringence of the fibres for force/pressure measurement and their very low temperature sensitivity to detect the onset of corrosion. This new type of sensor not only determines the onset of corrosion but also allows for better monitoring along the length of a reinforcement bar.
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