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Investigation of positioning of FBG sensors for smart monitoring of oil and gas subsea structures.

Johny, Jincy; Prabhu, Radhakrishna; Fung, Wai-keung; Watson, John

Authors

Jincy Johny

Radhakrishna Prabhu

Wai-keung Fung

John Watson

Abstract

Condition monitoring of offshore structures is an indispensable task in the oil and gas industry. Fibre Bragg Grating (FBG) is the key technology used down-hole in order to sense different physical parameters such as strain, vibration, etc. This paper investigates the effect of FBG sensor positions on its reflected signal, in order to optimise the sensor positioning plan in structural health monitoring of subsea structures. Theoretical and experimental study was carried out on FBG sensors, to evaluate its strain sensitivities with varying positions. In addition, micro-displacement based strain analysis of FBG was carried out using a cantilever setup, in order to identify the effects of tensile and compressive strain under various load conditions. Furthermore, the effect of different grating parameters on FBG sensing signal were also analyzed. Theoretical modeling and simulation of FBG was conducted in MATLAB using the coupled mode theory.

Start Date Apr 10, 2016
Publication Date Apr 13, 2016
Print ISSN 0197-7385
Publisher Institute of Electrical and Electronics Engineers
Article Number 7485662
Series ISSN 0197-7385
Institution Citation JOHNY, J., PRABHU, R., FUNG, W.K. and WATSON, J. 2016. Investigation of positioning of FBG sensors for smart monitoring of oil and gas subsea structures. In Proceedings of the 2016 Marine Technology Society/Institute of Electrical and Electronics Engineers (MTS/IEEE) OCEANS conference: our future is with oceans, 10-13 April 2016, Shanghai, China. Piscataway: IEEE [online], paper ID 7485662. Available from: https://dx.doi.org/10.1109/OCEANSAP.2016.7485662
DOI https://doi.org/10.1109/OCEANSAP.2016.7485662
Keywords Fibre optic sensors; FBG; Coupled mode theory; Structural health monitoring

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