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Sensors (Basel). 2019 Feb 23;19(4). pii: E954. doi: 10.3390/s19040954.

Application of a Novel Long-Gauge Fiber BraggGrating Sensor for Corrosion Detection via aTwo-level Strategy.

Author information

1
School of Civil Engineering, Southeast University, Nanjing 210096, China. chengyy@seu.edu.cn.
2
School of Civil Engineering, Southeast University, Nanjing 210096, China. 220171151@seu.edu.cn.
3
School of Civil Engineering, Southeast University, Nanjing 210096, China. jian@seu.edu.cn.
4
Jiangsu Key Laboratory of Engineering Mechanics, Southeast University, Nanjing 210096, China. jian@seu.edu.cn.
5
School of Civil Engineering, Southeast University, Nanjing 210096, China. zswu@seu.edu.cn.
6
International Institute for Urban System Engineering, Southeast University, Nanjing 210096, China. zswu@seu.edu.cn.

Abstract

Corrosion of main steel reinforcement is one of the most significant causes of structuraldeterioration and durability reduction. This research proposes a two-level detection strategy tolocate and quantify corrosion damage via a new kind of long-gauge fiber Bragg grating (FBG) sensor.Compared with the traditional point strain gauges, this new sensor has been developed for bothlocal and global structural monitoring by measuring the averaged strain within a long gauge length.Based on the dynamic macrostrain responses of FBG sensors, the strain flexibility of structures areidentified for corrosion locating (Level 1), and then the corrosion is quantified (Level 2) in terms ofreduction of sectional stiffness of reinforcement through the sensitivity analysis of strain flexibility.The two-level strategy has the merit of reducing the number of unknown structural parametersthrough corrosion damage location (Level 1), which guarantees that the corrosion quantification(Level 2) can be performed efficiently in a reduced domain. Both numerical and experimentalexamples have been studied to reveal the ability of distributed long-gauge FBG sensors for corrosionlocalization and quantification.

KEYWORDS:

corrosion detection; impact test; long-gauge fiber optic sensor; strain flexibility

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