Research on a fiber Bragg grating based corrosion sensor

被引：0
作者：
Song, Shi-De [1 ]
Li, Peng [1 ]
Zhou, Wei-Jie [1 ]
Wang, Xiao-Na [2 ]
机构：
[1] State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian
[2] School of Physics and Optoelectronic, Dalian University of Technology, Dalian
来源：
Guangdianzi Jiguang/Journal of Optoelectronics Laser | 2015年 / 26卷 / 10期
关键词：
Concrete; Corrosion; Corrosion sensor; Fiber Bragg grating (FBG); Steel;
D O I：
10.16136/j.joel.2015.10.0379
中图分类号：
学科分类号：
摘要：
The fiber Bragg grating (FBG) wavelength shift in an FBG strain sensor which is caused by expansive rebar corrosion products will be detected and monitored by an FBG interrogator. Based on this principle, a new type of FBG corrosion sensor is proposed in this paper, which consists of an FBG corrosion measurement sensor, an FBG temperature compensation sensor, and a customized rebar which has a pair of radial grooves, a pair of axial grooves, and a through-hole located between the two axial grooves. The FBG corrosion measurement sensor is designed to measure the expansion strain caused by rebar corrosion, and the FBG temperature compensation sensor is designed to eliminate the cross-sensitivity of FBG corrosion measurement sensor. The customized rebar with radial epoxy fixing grooves is designed to install the FBG corrosion measurement sensor on its surface and the sensitivity enhanced FBG temperature compensation sensor in the through-hole which is finally connected with optical cable in axial grooves. The corrosion rate is derived by the wavelength shift of FBG corrosion sensor in this paper, so the rebar corrosion can be monitored and assessed by the FBG wavelength shift. The FBG corrosion sensor is embedded in cement mortar and subsequently casted in concrete. The performance of the FBG corrosion sensor is studied in an accelerated electrochemical corrosion test. Experimental results show that the new type of FBG corrosion sensor has relatively large measurement range of corrosion rate. The FBG corrosion sensor is suitable for monitoring slightly and moderately corroded rebars, thus the FBG corrosion sensor can be employed to monitor the rebars in reinforced concrete structures, such as buildings, bridges and tunnels. ©, 2015, Board of Optronics Lasers. All right reserved.
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页码：1866 / 1872
页数：6
相关论文
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