Fundamental Studies on the Use of Distributed Fibre Optical Sensing on Concrete and Reinforcing Bars

Distributed fibre optical sensing (DFOS) allows for quasi-continuous strain measurement in a broad range of gauge lengths and measurement frequencies. In particular, Rayleigh backscatter-based coherent optical frequency domain reflectometry has recently registered a significant application increase...

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Vydáno v:Sensors (Basel, Switzerland) Ročník 21; číslo 22; s. 7643
Hlavní autoři: Galkovski,  Tena, Lemcherreq, Yasmin, Mata-Falcón, Jaime, Kaufmann, Walter
Médium: Journal Article
Jazyk:angličtina
Vydáno: Switzerland MDPI AG 17.11.2021
MDPI
Témata:
Concrete
concrete compression
Cracks
distributed fibre optical sensing
Light
Optics
Reinforced concrete
reinforcing steel
Sensors
concrete compression
distributed fibre optical sensing
reinforcing steel
ISSN:1424-8220, 1424-8220
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Popis
Shrnutí:Distributed fibre optical sensing (DFOS) allows for quasi-continuous strain measurement in a broad range of gauge lengths and measurement frequencies. In particular, Rayleigh backscatter-based coherent optical frequency domain reflectometry has recently registered a significant application increase in structural concrete research and monitoring thanks to its numerous merits, such as high resolution and low invasiveness. However, it is not a plug-and-play technique. The quality of the acquired data depends highly on the choice of the fibre optical sensor and the methods of instrumentation and post-processing. Furthermore, its unprecedented resolution and sensitivity allow capturing local effects not well documented so far. This paper analyses the suitability of DFOS based on Rayleigh backscatter for reliably measuring strains and discusses the origin and structural relevance of local variations in the results. A series of experimental investigations are presented, comprising tensile tests on bare reinforcing bars and concrete compression tests. A critical analysis of the results leads to a best practice for applying DFOS to reinforcing bars and concrete, which establishes a basis for reliable, accurate measurements in structural concrete applications with bonded reinforcement.
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ISSN:1424-8220
1424-8220
DOI:10.3390/s21227643