Abstract
Corrosion damage not only causes structural failure, but also leads to maintenance and repair costs. Improving the effective sensor technology for corrosion detection can reduce the economic loss and provide safe structures with longer service. This paper presents an evaluation technique developed to assess the progressive strain in a corrosive environment using fiber Bragg grating (FBG) sensors. The progress in corrosion process of structural steel coupons under stressed and unstressed condition in a laboratory environment is studied. The strains are measured with electrical resistance strain gauges and FBG sensors and are compared. Strain in coupons under stressed and unstressed condition is measured, and distinct strain behavior is brought out along with reliability of measurements in adverse environment. The central wavelength shift and peak power of FBG are analyzed with interrogator, and the capability of FBG sensor to monitor the progress in corrosion is brought out.
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