A novel method of embedding distributed optical fiber sensors for structural health monitoring
A novel method of embedding distributed optical fiber sensors for structural health monitoring
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DOI：
10.1088/0964-1726/20/12/125018
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发表时间：
2011-12-01
影响因子：
4.1
通讯作者：
Bai, Y.
中科院分区：
文献类型：
--
作者：
Mao, J. H.;Jin, W. L.;Bai, Y.
基于布里渊散射的分布式光纤传感器（BOTDR或BOTDA）可以测量和监测光纤沿着方向产生的应变和温度。该系统具有实时性好、精度高、稳定性好等特点，非常适合于大型民用基础设施的健康监测。然而，将其应用于结构健康监测的主要挑战是确保它是鲁棒的，并且可以通过采用合适的嵌入方法进行修复。提出了一种基于吹气和真空灌浆技术的光纤传感器长距离埋设新方法。该方法在安装过程中对正常混凝土施工无干扰，可方便地替代长距离埋地光纤传感器。通过两个阶段的静载荷试验研究了低轨光纤陀螺的性能。通过过载试验研究了低轨光纤陀螺的精度和重复性。通过腐蚀试验证实了LEOFS的耐久性和稳定性。利用LEOFS的应变来评价碳纤维复合材料的加固效果，从而判断梁的健康状态。
A distributed optical fiber sensor based on Brillouin scattering (BOTDR or BOTDA) can measure and monitor strain and temperature generated along optical fiber. Because it can measure in real-time with high precision and stability, it is quite suitable for health monitoring of large-scale civil infrastructures. However, the main challenge of applying it to structural health monitoring is to ensure it is robust and can be repaired by adopting a suitable embedding method. In this paper, a novel method based on air-blowing and vacuum grouting techniques for embedding long-distance optical fiber sensors was developed. This method had no interference with normal concrete construction during its installation, and it could easily replace the long-distance embedded optical fiber sensor (LEOFS). Two stages of static loading tests were applied to investigate the performance of the LEOFS. The precision and the repeatability of the LEOFS were studied through an overloading test. The durability and the stability of the LEOFS were confirmed by a corrosion test. The strains of the LEOFS were used to evaluate the reinforcing effect of carbon fiber reinforced polymer and thereby the health state of the beams.