26 November 2007 Distributed fiber optic crack sensor for concrete structures
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In this paper a novel distributed fiber optic crack sensor with polymer encapsulation based on optical time domain reflectometer (OTDR) is presented. The sensor head includes two layers of polymer and a bare fiber embedded in them. The crack induced deformation in the sensor head will result in the bend loss in the fiber. Utilizing the OTDR measurement, the position and the size of the crack can be determined. Two types of fiber arrangement are introduced in this paper. Experiment was carried out to evaluate the performance of the distributed fiber optic crack sensor. The primary results show that the fiber optic crack sensor has good linearity between the bend loss and the crack open size. The crack size resolution is better than 1mm.
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Wentao Zhang, Wentao Zhang, Jingyun Dai, Jingyun Dai, Hua Xu, Hua Xu, Baochen Sun, Baochen Sun, Yanliang Du, Yanliang Du, } "Distributed fiber optic crack sensor for concrete structures", Proc. SPIE 6830, Advanced Sensor Systems and Applications III, 68300F (26 November 2007); doi: 10.1117/12.757864; https://doi.org/10.1117/12.757864

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