Application of Fe-C Coated LPFG Sensor for Early Stage Corrosion Monitoring of Steel Bar in RC Structures


Fe-C coated long period fiber grating (LPFG) sensor was employed to monitor the corrosion-induced mass loss of steel bar in 3.5 wt% NaCl solution and steel bar in mortar cylinder. A two-stage process of the change in resonant wavelength as a function of the corrosion-induced mass loss of steel bar was observed. The LPFG sensor can effectively monitor steel bar corrosion loss in 3.5 wt% NaCl solution for 14 h with a sensitivity of 0.124 mg/nm change of the resonant wavelength, and in mortar cylinder for 14 days with a sensitivity of 0.405 mg/nm change of the resonant wavelength, respectively.


Civil, Architectural and Environmental Engineering

Research Center/Lab(s)

INSPIRE - University Transportation Center


The authors gratefully acknowledge the financial support provided by the Fundamental Research Funds for the Central Universities of China (DUT17RC(3)076) and the US National Science Foundation (CMMI-1235202).

Keywords and Phrases

Bars (metal); Coatings; Cylinders (shapes); Diffraction gratings; Electrochemical corrosion; Mortar; Sodium alloys; Sodium chloride; Steel fibers; 3.5 wt% NaCl solution; Corrosion loss; Corrosion monitoring; Long period fiber grating; Long Period Gratings; Resonance wavelengths; Resonant wavelengths; Two-stage process; Steel corrosion; EIS; Long-period grating; LPR

International Standard Serial Number (ISSN)


Document Type

Article - Journal

Document Version


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© 2018 Elsevier, All rights reserved.

Publication Date

01 Jun 2018