光纤布拉格光栅水下钢筋腐蚀传感器

发布时间：2018-01-11 21:26

  本文关键词：光纤布拉格光栅水下钢筋腐蚀传感器　出处：《电子测量与仪器学报》2017年07期 　论文类型：期刊论文

  更多相关文章： 光纤布拉格光栅 传感器 水下混凝土 钢筋腐蚀

【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。
[Abstract]:The principle of prestress release and strain measurement based on fiber Bragg gratings. A FBG steel corrosion sensor for monitoring the corrosion of steel bars in underwater reinforced concrete structures is proposed in this paper. The sensor uses two FBG as the core element and tightly twines the FBG-1 after pretension. Fixed on the surface of the finely machined steel bar, used to monitor the pre-stress relaxation caused by the loss of corrosion products; The FBG-2 is installed in the axial through hole of the steel bar and used as a temperature compensator to eliminate the temperature cross sensitivity effect of FBG-1. In order to improve the survival rate of the sensor, the sensor is encapsulated in mortar. The formula for calculating the mass corrosion rate of the steel bar is derived and the performance of the sensor is studied by electrochemical accelerated corrosion experiment. The corrosion degree of steel bar is measured by monitoring the wavelength change of FBG. The experimental results show that the corrosion sensor can monitor the corrosion of steel bar in underwater reinforced concrete structure. It is suitable for the corrosion monitoring of reinforced concrete structures such as port wharves, piers, dams, cisterns and other reinforced concrete structures.
【作者单位】： 大连理工大学海岸及近海工程国家重点实验室;大连理工大学物理与光电工程学院;
【分类号】：TN253;TP212
【正文快照】： 1引言当钢筋混凝土结构处于海洋或除冰盐等环境时,氯离子(Cl-)会渗透进入混凝土,当Cl-在钢筋表面达到一定浓度时将破坏钢筋表面的钝化膜,从而加速钢筋腐蚀。有统计表明钢筋腐蚀已经成为降低钢筋混凝土结构耐久性的首要因素[1],带来安全隐患的同时也增加了结构的维修和加固费用，

本文编号：1411268