30 April 2008 Distributed strain measurement with polymer optical fibers integrated into multifunctional geotextiles
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Fiber optic sensors based on polymer optical fibers (POF) have the advantage of being very elastic and robust at the same time. Unlike silica fibers, standard PMMA POF fibers can be strained to more than 40% while fully maintaining their light guiding properties. We investigated POF as a distributed strain sensor by analysing the backscatter increase at the strained section using the optical time domain reflectometry (OTDR) technique. This sensing ability together with its high robustness and break-down strain makes POF well-suited for integration into technical textiles for structural health monitoring purposes. Within the European research project POLYTECT (Polyfunctional textiles against natural hazards) technical textiles with integrated POF sensors, among others sensors are being developed for online structural health monitoring of geotechnical structures. Mechanical deformation in slopes, dams, dikes, embankments and retrofitted masonry structures is to be detected before critical damage occurs. In this paper we present the POF strain sensor properties, reactions to disturbing influences as temperature and bends as well as the results of the different model tests we conducted within POLYTECT. We further show the potential of perfluorinated graded-index POF for distributed strain sensing with increased spatial resolution and measurement lengths.
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Sascha Liehr, Sascha Liehr, Philipp Lenke, Philipp Lenke, Katerina Krebber, Katerina Krebber, Monika Seeger, Monika Seeger, Elke Thiele, Elke Thiele, Heike Metschies, Heike Metschies, Berhane Gebreselassie, Berhane Gebreselassie, Johannes Christian Münich, Johannes Christian Münich, Lothar Stempniewski, Lothar Stempniewski, } "Distributed strain measurement with polymer optical fibers integrated into multifunctional geotextiles", Proc. SPIE 7003, Optical Sensors 2008, 700302 (30 April 2008); doi: 10.1117/12.780508; https://doi.org/10.1117/12.780508

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