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Using fibre optic sensors for structural monitoring of vessels in open water transits

Gloury, Darren (2016). Using fibre optic sensors for structural monitoring of vessels in open water transits. Bachelor of Engineering (4th Year Project) Thesis, Charles Darwin University.

Document type: Thesis
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Author Gloury, Darren
Title Using fibre optic sensors for structural monitoring of vessels in open water transits
Institution Charles Darwin University
Publication Date 2016
Thesis Type Bachelor of Engineering (4th Year Project)
Supervisor Chan, Erwin
Vafi, Sina
0906 - Electrical and Electronic Engineering
Abstract The past four Australian prime ministers have all pledged a vast capability increase for the countries navy which includes up to 30 new vessels. Little media attention was focussed on the fact the announcement means some vessels plagued by structural problems will be replaced early while the nations existing submarines and minehunters operational life will need to be extended.

One possible solution to increase the service life and reliability of both existing and replacement vessels is to implement a permanent real time Fibre Optic Hull Monitoring System (FOHMS), based on Fibre Bragg Grated (FBG) sensors. FBG sensors have become common components installed on newly built smart structures and are now finding their way onto vessels. FBG sensors use exclusively optical properties to measure strain on beams. Most importantly FBG’s suffer none of the constraints of existing electrical based sensors, making them ideal for installation in a marine environment. The data collected can be used to alert captains in real time strains on the vessel, improve maintenance planning through more accurate fatigue analysis or to quickly identify a structural deficiencies in a vessels design.

This thesis will attempt to examine FOHMS and highlight their advantages, principal of operation and challenges. It will validate the science and demonstrate the capabilities of such a system while discussing future opportunities and areas for possible improvement. Different grating configurations and system interrogation techniques are examined which culminates in the proposal and experimentation of a new method based on microwave photonics.
Keyword fibre optics
fibre bragg grating
strain sensors
hull monitoring system
microwave photonics
naval architecture
analogue electronic
signal processing
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Created: Tue, 05 Jul 2016, 11:09:51 CST by Jessie Ng