钢筋腐蚀监测的光波导传感方法原理探索

本文提出了一种用于混凝土结构钢筋腐蚀监测的光波导传感方法,该方法利用金属膜层局部取代光波导的介质包层,构成腐蚀敏感膜,从而获取金属腐蚀信息.本文依据波导理论讨论了该方法的原理,利用电化学方法在721比色皿的石英玻璃上证实了平面光波导腐蚀传感方案的可行性,并进一步用电镀方法制备出了光纤腐蚀传感器(FOCS)实验样品,取得了预期实验结果.

THE OPTIC WAVEGUIDE SENSING METHOD FOR MONITORING CORROSION OF STEEL IN REINFORCED CONCRETE

An optical waveguide sensing method was proposed for monitoring corrosion of rebar in reinforced concrete structures.Replacing the cladding of waveguide with metal film in a particular location,the method takes the metal film as the corrosion sensitive film.The principle of method was analyzed.The experiment of waveguide sensor was carried out on a 721 colorimetric vessel,with which the solution is held in itself and the light is propagated in its side wall.A Fe C alloy film was electroplated onto the inner side of vessel to form the corrosion sensitive film.The comparision tests of optics and electrochemistry showed that the light propagating in the waveguide is affected by the corrosion current.The further experiment was carried out on an optical fiber sensor.The experimental results were in good accordance with the principle.