Abstract
The development of an optical fiber corrosion sensor based on the principle of lightreflection is presented in this paper. The sensor consists of an optical fiber reflection sensorand a tube/film subassembly formed by welding a sacrificial metallic film to a steel tube.One side of the sacrificial metallic film is finely polished and is isolated from theenvironment while the other side is exposed to the corrosive environment. The corrosionpits initiated at the exposed film surface slowly penetrate the sacrificial film as theexposure time increases. The corrosion pits that reach the polished surface reducethe surface reflectivity of the polished surface. This decrease in reflectivity isdetected by the optical fiber reflectivity sensor. To interrogate multiple sensorsat one time, a sensor multiplexing scheme was implemented. The principles ofoperation, packaging, and characterization of the corrosion sensors are presented.
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