Theoretical investigation of positional influence of FBG sensors for structural health monitoring of offshore structures.

Johny, Jincy; Summers, Jade; Bhavsar, Kaushalkumar; Joseph, Ginson P.; Fung, Wai Keung; Prabhu, Radhakrishna

Abstract

Fibre Bragg Grating (FBG) is a key technology for condition monitoring of different offshore oil and gas structures. FBG sensors are used to sense different physical parameters such as strain, temperature, vibration, etc. This paper investigates the effect of FBG sensor positions on the reflected sensing signal, to optimise the sensor positioning plan for structural health monitoring of offshore structures. Theoretical investigations were carried out on a cantilever beam to analyze the strain effects. Effect of different cantilever beam shapes, materials and their thickness on strain was investigated. Theoretical studies were also carried out to evaluate the strain sensitivities of FBG sensors. Furthermore, micrometer displacement based strain analysis of cantilever beam was carried out using FBG sensors and electrical strain gauges to study the positional influence and compared it with the theoretical results obtained.

Citation

JOHNY, J., SUMMERS, J., BHAVSAR, K., JOSEPH, G.P., FUNG, W.-K. and PRABHU, R. 2017. Theoretical investigation of positional influence of FBG sensors for structural health monitoring of offshore structures. In Proceedings of OCEANS 2017, 19-22 June 2017, Aberdeen, UK. New York: IEEE [online], article number 8084976, pages 2406-2410. Available from: https://doi.org/10.1109/OCEANSE.2017.8084976

• Conference Name: OCEANS 2017 (Aberdeen)
• Conference Location: Aberdeen, UK
• Start Date: Jun 19, 2017
• End Date: Jun 22, 2017
• Acceptance Date: Jun 19, 2017
• Online Publication Date: Jun 19, 2017
• Publication Date: Oct 26, 2017
• Deposit Date: Jan 29, 2018
• Publicly Available Date: Jan 29, 2018
• Publisher: IEEE Institute of Electrical and Electronics Engineers
• Article Number: 8084976
• Pages: 2406-2410
• ISBN: 9781538621110
• DOI: https://doi.org/10.1109/OCEANSE.2017.8084976
• Keywords: Fibre optic sensors; Strain analysis; Cantilever beam structure; FBG
• Public URL: http://hdl.handle.net/10059/2697