An optical fiber-based corrosion sensor based on laser light reflection

Manjunatha Shenoy; Haiying Huang

doi:10.1117/12.847567

1 April 2010 An optical fiber-based corrosion sensor based on laser light reflection

Manjunatha Shenoy, Haiying Huang

Proceedings Volume 7647, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2010; 76473O (2010) https://doi.org/10.1117/12.847567
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2010, San Diego, California, United States

Abstract

The development of an optical fiber corrosion sensor based on the principle of light reflection is presented in this paper. The sensor consists of an optical fiber reflection sensor and 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 isolated from the environment while the other side is exposed to the corrosive environment. The corrosion pits initiated at the exposed film surface slowly penetrate into the sacrificial film as the exposure time increases. Once the corrosion pits reach the polished surface, its surface reflectivity decreases. This decrease in reflectivity is monitored by the optical fiber reflectivity sensor. Since the corrosion sensor detects the corrosion pits only after the corrosion is severe enough to penetrate through the film, the sensitivity of the corrosion sensor is determined by the film thickness. The principle of operation, packaging, and characterization of the corrosion sensors are presented.

Citation Download Citation

Manjunatha Shenoy and Haiying Huang "An optical fiber-based corrosion sensor based on laser light reflection", Proc. SPIE 7647, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2010, 76473O (1 April 2010); https://doi.org/10.1117/12.847567

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