Sensing Principle Analysis of FBG Based Sensors

Khan, Imran

doi:10.9790/1676-0130106

Cited by 2 publications

(1 citation statement)

References 8 publications

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“…When the incident light passes through the gratings, light waves with a specific Bragg wavelength (

) are reflected, while the rest of light waves are transmitted. The value of the Bragg wavelength (

) of an FBG sensor can be determined using the effective refractive index (

) of the fiber and the Bragg grating period (

) [ 24 , 33 , 34 ] as:

…”

Section: Theoretic Analysismentioning

confidence: 99%

Monitoring Epoxy Coated Steel under Combined Mechanical Loads and Corrosion Using Fiber Bragg Grating Sensors

Zhang

Huang

et al. 2022

Sensors

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Fiber Bragg grating (FBG) sensors have been applied to assess strains, stresses, loads, corrosion, and temperature for structural health monitoring (SHM) of steel infrastructure, such as buildings, bridges, and pipelines. Since a single FBG sensor measures a particular parameter at a local spot, it is challenging to detect different types of anomalies and interactions of anomalies. This paper presents an approach to assess interactive anomalies caused by mechanical loading and corrosion on epoxy coated steel substrates using FBG sensors in real time. Experiments were performed by comparing the monitored center wavelength changes in the conditions with loading only, corrosion only, and simultaneous loading and corrosion. The theoretical and experimental results indicated that there were significant interactive influences between loading and corrosion for steel substrates. Loading accelerated the progress of corrosion for the epoxy coated steel substrate, especially when delamination in the epoxy coating was noticed. Through the real-time monitoring from the FBG sensors, the interactions between the anomalies induced by the loading and corrosion can be quantitatively evaluated through the corrosion depth and the loading contact length. These fundamental understandings of the interactions of different anomalies on steel structures can provide valuable information to engineers for better management of steel structures.

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