Large scale distribution monitoring of FRP-OF based on BOTDR technique for infrastructures

Zhi Zhou; Jianping He; Kai Yan; Jinping Ou

doi:10.1117/12.716197

10 April 2007 Large scale distribution monitoring of FRP-OF based on BOTDR technique for infrastructures

Zhi Zhou, Jianping He, Kai Yan, Jinping Ou

Proceedings Volume 6530, Sensor Systems and Networks: Phenomena, Technology, and Applications for NDE and Health Monitoring 2007; 653006 (2007) https://doi.org/10.1117/12.716197
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2007, San Diego, California, United States

Abstract

BOTDA(R) sensing technique is considered as one of the most practical solution for large-sized structures as the instrument. However, there is still a big obstacle to apply BOTDA(R) in large-scale area due to the high cost and the reliability problem of sensing head which is associated to the sensor installation and survival. In this paper, we report a novel low-cost and high reliable BOTDA(R) sensing head using FRP(Fiber Reinforced Polymer)-bare optical fiber rebar, named BOTDA(R)-FRP-OF. We investigated the surface bonding and its mechanical strength by SEM and intensity experiments. Considering the strain difference between OF and host matrix which may result in measurement error, the strain transfer from host to OF have been theoretically studied. Furthermore, GFRP-OFs sensing properties of strain and temperature at different gauge length were tested under different spatial and readout resolution using commercial BOTDA. Dual FRP-OFs temperature compensation method has also been proposed and analyzed. And finally, BOTDA(R)-OFs have been applied in Tiyu west road civil structure at Guangzhou and Daqing Highway. This novel FRP-OF rebar shows both high strengthen and good sensing properties, which can be used in long-term SHM for civil infrastructures.

Citation Download Citation

Zhi Zhou, Jianping He, Kai Yan, and Jinping Ou "Large scale distribution monitoring of FRP-OF based on BOTDR technique for infrastructures", Proc. SPIE 6530, Sensor Systems and Networks: Phenomena, Technology, and Applications for NDE and Health Monitoring 2007, 653006 (10 April 2007); https://doi.org/10.1117/12.716197

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