Research on a new type of fiber Bragg grating based corrosion sensor

Peng Li; Shide Song; Xiaona Wang; Weijie Zhou; Zuocai Zhang

doi:10.1117/12.2195686

10 August 2015 Research on a new type of fiber Bragg grating based corrosion sensor

Peng Li, Shide Song, Xiaona Wang, Weijie Zhou, Zuocai Zhang

Proceedings Volume 9620, 2015 International Conference on Optical Instruments and Technology: Optical Sensors and Applications; 962018 (2015) https://doi.org/10.1117/12.2195686
Event: International Conference on Optical Instruments and Technology 2015, 2015, Beijing, China

Abstract

Investigations of the corrosion of rebars in concrete structures are widely studied because of the serious damage to concrete caused by rebar corrosion. The rebar corrosion products in reinforced concrete take up 2~6 times the volume of the rebar. Based on this principle, a new type of fiber Bragg grating (FBG) corrosion sensor is proposed in this paper, which consists of two sensors, an FBG corrosion measurement sensor to measure the expansion strain caused by rebar corrosion, and a temperature compensation sensor to eliminate the cross-sensitivity of FBG corrosion sensor. The corrosion rate is derived by the wavelength shift of FBG corrosion sensor, so rebar corrosion can be monitored and assessed by the FBG wavelength shift. A customized rebar with epoxy fixing groove is designed to install a corrosion sensor on its surface and an embedded temperature compensation sensor. The corrosion sensor is embedded in cement mortar and subsequently casted in concrete. The performance of the corrosion sensor is studied in an accelerated electrochemical corrosion test. Experimental results show that the new type of corrosion sensor has advantage of relatively large measurement range of corrosion rate. The corrosion sensor is suitable to monitor slightly and moderately corroded rebars.

Citation Download Citation

Peng Li, Shide Song, Xiaona Wang, Weijie Zhou, and Zuocai Zhang "Research on a new type of fiber Bragg grating based corrosion sensor", Proc. SPIE 9620, 2015 International Conference on Optical Instruments and Technology: Optical Sensors and Applications, 962018 (10 August 2015); https://doi.org/10.1117/12.2195686

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KEYWORDS

Corrosion

Sensors

Fiber Bragg gratings

Temperature metrology

Cements

Epoxies

Capillaries

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