Strain based FBG sensor for real-time corrosion rate monitoring in pre-stressed structures
Title
Strain based FBG sensor for real-time corrosion rate monitoring in pre-stressed structures
Subject
Corrosion rate sensing
Fiber Bragg grating technology
Optical sensors
Real-time monitoring
Description
A strain based corrosion sensor for the detection of environmental corrosion of pre-stressed structures was developed and tested on mild steel specimens readily available. Theoretically, a beam shaped specimen under a displacement load exhibits a linear relationship between the strain observed at any point through the thickness of the beam cross-section. This property was exploited to detect thickness changes in pre-stressed mild steel specimens in a double bending configuration under an electrochemically excited corrosion reaction. The reaction was accelerated by supplying a DC current to the cell where the specimens act as anodes of the system, while graphite rods serve as cathodes. The strain was logged using fiber optic Bragg grating technology and conventional electrical strain gages simultaneously. Results show a strong relationship between the corrosion rate observed by back-calculation from supplied current and the time derivative of the measured strain values. Application of this sensor can therefore be extended to a variety of structures under mechanical loading, proving valuable for both its ability to measure corrosion rate in real-time, while maintaining an intrinsically safe nature appropriate by industrial standards.
276-285
236
Creator
Al Handawi, Khalil
Vahdati, Nader
Rostron, Paul
Lawand, Lydia
Shiryayev, Oleg
Publisher
Sensors and Actuators B: Chemical
Date
2016
Type
journalArticle
Identifier
0925-4005
10.1016/j.snb.2016.05.167
Collection
Citation
Al Handawi, Khalil et al., “Strain based FBG sensor for real-time corrosion rate monitoring in pre-stressed structures,” Lamar University Midstream Center Research, accessed May 14, 2024, https://lumc.omeka.net/items/show/27519.