电子测量与仪器学报

宋世德,张作才,王晓娜.光纤布拉格光栅水下钢筋腐蚀传感器[J].电子测量与仪器学报,2017,31(7):1002-1008

光纤布拉格光栅水下钢筋腐蚀传感器

Optical fiber grating sensor for monitoring corrosion of reinforcing steel under water

DOI：10.13382/j.jemi.2017.07.003

英文关键词:fiber Bragg grating（FBG） sensor underwater concrete reinforcement corrosion

基金项目:

作者	单位
宋世德	大连理工大学海岸及近海工程国家重点实验室大连116024
张作才	大连理工大学海岸及近海工程国家重点实验室大连116024
王晓娜	大连理工大学物理与光电工程学院大连116024

Author	Institution
Song Shide	State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024,China
Zhang Zuocai	State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024,China
Wang Xiaona	School of Physics and Optoelectronics, Dalian University of Technology, Dalian 116024,China

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中文摘要:

基于光纤布拉格光栅（fiber Bragg grating，FBG）的预应力释放和应变测量原理，提出了一种用于水下钢筋混凝土结构中钢筋腐蚀监测的FBG钢筋腐蚀传感器。传感器以两根FBG为核心元件，将FBG 1预拉后紧密缠绕、固定于精细加工过的钢筋件表面，用于监测腐蚀产物流失导致的预应力松弛；将FBG 2安装于钢筋件的轴向通孔中，作为温度补偿器用于消除FBG 1的温度交叉敏感效应。为了提高传感器的成活率，将传感器封装在砂浆中，并且推导了被测钢筋件的质量腐蚀率计算公式。通过电化学加速腐蚀实验研究了传感器的工作性能，通过监测FBG的波长变化来测量钢筋的腐蚀程度。实验结果表明，FBG钢筋腐蚀传感器可以监测水下钢筋混凝土结构中的钢筋腐蚀，并且具有较大的测量范围、较高的灵敏度和稳定性，适用于港口码头、桥墩、水坝、蓄水池等钢筋混凝土结构中的钢筋腐蚀监测。

英文摘要:

Based on the principle of pre stress release and strain measurement of the fiber Bragg grating (FBG), an optical fiber grating sensor for monitoring the corrosion of underwater reinforcing steel was proposed in this paper. As the core component of the sensor, FBG 1 was pre stretched and tightly wound on the surface of the finely fabricated reinforcing bar for monitoring the pre stressing relaxation caused by the loss of corrosion products, and FBG 2 was installed in the axial through hole of the reinforcing bar for eliminating the cross sensitivity of FBG 1. In order to improve the survival rate of the sensors, the sensors were embedded into mortar specimens, and the evaluation formula to evaluate mass loss rate of steel rebar was derived.Theperformance of the sensor wasresearched inadesignedelectrochemicalcorrosionaccelerationexperiment, and the corrosion degree could be measured by detecting the wavelength of FBG.By the central wavelength, the corrosion degree of reinforcing steel would be monitored. The experimental results show that the sensor can beusedtomonitor the steelrebar corrosion ofunderwater reinforced concretestructure with large monitoring range, has high sensitivity and good stability. The sensor can be employed to monitor the steel bar corrosion in reinforced concrete structure, such as harbor and pier, bridge pier, dam, reservoir and so on.

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