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“Embedded distributed optical fiber sensors in reinforced concrete structures-case study”

Sensors (MPDI), 26 Mar 2018
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On 26th March 2018, Antonio Barrias (ESR11) published the paper titled “Embedded Distributed Optical Fiber Sensors in Reinforced Concrete Structures—A Case Study” together with his supervisors Joan Ramon Casas and Sergi Villalba, as part of the Special Issue Optical Fiber Sensors 2017 in Sensors, an original peer-reviewed journal covering all aspects of Physical Sensing. This paper is open access and available for download at the DOI link provided with the full reference below.


When using distributed optical fiber sensors (DOFS) on reinforced concrete structures, a compromise must be achieved between the protection requirements and robustness of the sensor deployment and the accuracy of the measurements both in the uncracked and cracked stages and under loading, unloading and reloading processes. With this in mind the authors have carried out an experiment where polyimide-coated DOFS were installed on two concrete beams, both embedded in the rebar elements and also bonded to the concrete surface. The specimens were subjected to a three-point load test where after cracking, they are unloaded and reloaded again to assess the capability of the sensor when applied to a real loading scenarios in concrete structures. Rayleigh Optical Frequency Domain Reflectometry (OFDR) was used as the most suitable technique for crack detection in reinforced concrete elements. To verify the reliability and accuracy of the DOFS measurements, additional strain gauges were also installed at three locations along the rebar. The results show the feasibility of using a thin coated polyimide DOFS directly bonded on the reinforcing bar without the need of indention or mechanization. A proposal for a Spectral Shift Quality (SSQ) threshold is also obtained and proposed for future works when using polyimide-coated DOFS bonded to rebars with cyanoacrylate adhesive. -> Link to full text in repository
Keywords: Fiber optics; structural health monitoring; distributed fiber sensing; time domain reflectometry; frequency domain reflectometry; civil engineering.

Point Optic Fiber Sensors (OFS) versus Distributed Fiber Optic Sensors (DOFS)

Sensors (ISSN 14248220, 14243210) is published by Multidisciplinary Digital Publishing Institute (MDPI). Both theoretical and experimental papers in Physical Sensing are considered, as well as review papers. Subjects include without being limited to, electrical and thermal-based sensors, mass-sensitive and fiber-optic sensors, optoelectronic and photonic sensors, gas sensors, physical sensor applications for food industry and environmental monitoring, physical sensor arrays, modeling, design and software for physical sensors, sensor technology and new physical sensor principles (Source). According to scimagojr, the journal has the following impact indicators:

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