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Quasidistributed optical fiber sensing system to monitor the displacement of joints on the face slab of concrete-faced rockfill dams

机译:准分布式光纤传感系统,用于监测混凝土面板堆石坝面板上接缝的位移

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摘要

We propose a quasidistributed optical fiber-sensing system based on optical time-domain reflectom-etry (OTDR). The quasidistributed optical fiber-sensing system can be used to monitor the joint opening displacement or crack opening displacement of the face slab of concrete-faced rockfill dams (CFRDs). The crack sensors, which are based on the sensing principle of linear macrobending loss of optical fiber, are connected in series in each optical fiber link. In addition, multiple links can be connected with a single OTDR to construct an integrated monitoring system. Hence, the quasidistributed system overcomes some drawbacks of the distributed monitoring system, such as limited measurement range, fragility of fibers attached to the structural surface, and the nonlinear relationship between displacement and macrobending loss of optical fiber. To develop an optimal design plan for the monitoring system, some experiments are conducted to verify the independence of crack sensors and the minimum length of the connecting fiber between sensors. The analysis of the experiment results positively supports the application of optical loss in real structural monitoring.
机译:我们提出了一种基于光时域反射仪(OTDR)的准分布式光纤传感系统。准分布式光纤传感系统可用于监测混凝土面板堆石坝(CFRD)面板的接缝张开位移或裂缝张开位移。基于光纤的线性宏弯曲损耗的检测原理的裂缝传感器在每个光纤链路中串联连接。此外,可以将多个链接与单个OTDR连接以构建集成的监视系统。因此,准分布式系统克服了分布式监控系统的一些缺点,例如测量范围有限,附着在结构表面的光纤的脆性以及光纤位移与宏弯损耗之间的非线性关系。为了制定监测系统的最佳设计方案,进行了一些实验以验证裂纹传感器的独立性以及传感器之间连接光纤的最小长度。实验结果的分析为光学损失在实际结构监测中的应用提供了积极的支持。

著录项

  • 来源
    《Optical engineering》 |2019年第1期|016107.1-016107.9|共9页
  • 作者单位

    Xi'an University of Technology, State Key Laboratory of Eco-Hydraulics in Northwest Arid Region of China, Xi'an, China,Xi'an University of Technology, Institute of Water Resources and Hydroelectric Engineering, Xi'an, China;

    Xi'an University of Technology, State Key Laboratory of Eco-Hydraulics in Northwest Arid Region of China, Xi'an, China,Xi'an University of Technology, Institute of Water Resources and Hydroelectric Engineering, Xi'an, China;

    Hainan Tian Hong Municipal Design Co., Ltd., Haikou, China;

    Xi'an University of Technology, State Key Laboratory of Eco-Hydraulics in Northwest Arid Region of China, Xi'an, China,Xi'an University of Technology, Institute of Water Resources and Hydroelectric Engineering, Xi'an, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    quasidistributed optical fiber monitoring system; optical time domain reflectometry; construction joints; joint opening displacement; crack sensor; concrete-faced rockfill dams;

    机译:准分布式光纤监控系统光学时域反射仪施工缝;关节开口位移;裂纹传感器混凝土面板堆石坝;

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