AN OPTICAL FIBER SENSOR FOR MONITORING STEEL CORROSION IN CONCRETE STRUCTURES
For reinforced concrete structures,steel corrosion resulting from the penetration ofchloride ions or carbon dioxide is a major cause of degradation. The objective of the presentinvestigation is to develop a low-cost sensor for steel corrosion,which is based on a verysimple physical principle. The flat end of a cut optical fiber is coated with an iron thin film byion sputtering technique. Light is then sent into a fiber embedded in concrete and the reflectedsignal is monitored. Initially,most of the light is reflected by the iron layer. When corrosionoccurs to remove the iron layer,a significant portion of the light power will leave the fiber atits exposed end,and the reflected power is greatly reduced. By monitoring the reflected signal,it is possible to tell if the concrete environment at the location of the fiber tip will induce steelcorrosion or not. In this paper,the principle of the corrosion sensor is first described. Then,sensor fabrication and packaging for practical installation in concrete structures will bepresented. The performance of the packaged sensor is then assessed with three sets ofexperiments.
steel corrosion iron thin film ion sputtering technique optical fiber
Christopher K.Y. Leung Kai Tai Wan Liquan Chen
Department of Civil Engineering,the Hong Kong University of Science and Technology,Hong Kong SAR,PR China
国际会议
The International Conference on Durability of Concrete Structures(2008年混凝土结构耐久性国际学术会议)
杭州
英文
109-115
2008-11-01（万方平台首次上网日期，不代表论文的发表时间）