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

Johny, Jincy; Prabhu, Radhakrishna; Fung, Wai Keung; Watson, John

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.

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

• Presentation Conference Type: Conference Paper (published)
• Conference Name: 2016 Marine Technology Society/Institute of Electrical and Electronics Engineers (MTS/IEEE) OCEANS conference: our future is with oceans
• Start Date: Apr 10, 2016
• End Date: Apr 13, 2016
• Acceptance Date: Jan 15, 2016
• Online Publication Date: Apr 10, 2016
• Publication Date: Jun 9, 2016
• Deposit Date: Sep 12, 2016
• Publicly Available Date: Sep 12, 2016
• Print ISSN: 0197-7385
• Publisher: Institute of Electrical and Electronics Engineers (IEEE)
• Peer Reviewed: Peer Reviewed
• Article Number: 7485662
• Series ISSN: 0197-7385
• DOI: https://doi.org/10.1109/OCEANSAP.2016.7485662
• Keywords: Fibre optic sensors; FBG; Coupled mode theory; Structural health monitoring
• Public URL: http://hdl.handle.net/10059/1656
• Contract Date: Sep 12, 2016