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Proceedings Paper

An improved fiber optic strain sensor for gas tank monitoring with rf subcarrier phase and I&Q demodulation techniques
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Paper Abstract

With increased interest in the use of compressed gas as a vehicle fuel, attention has been focussed on the safety issues surrounding the tanks used to store the fuel. Currently it is necessary to remove the tanks from the vehicle in order to inspect them, which entails a considerable cost in manpower and takes the vehicle being out of service. We have been developing a sensor scheme that can provide in situ monitoring of the tanks condition. This entails bonding optical fibre sensors to the tank and using them to measure the strains experienced by the tank during pressurisation. If the tank is significantly damaged, then the tank will expand in a distorted manner. We therefore measure the strain characteristics of a healthy tank and use them as a reference for future measurements. The method of strain measurement is the well established rf subcarrier phase detection technique, however in this application the changes in optical power caused by microbending of the fibres during pressurisation produces inaccuracies. In order to overcome this problem we use both in-phase and quadrature mixing and then take the ratio of the outputs to obtain a value of arctangent that is independent of amplitude.

Paper Details

Date Published: 16 May 2005
PDF: 9 pages
Proc. SPIE 5758, Smart Structures and Materials 2005: Smart Sensor Technology and Measurement Systems, (16 May 2005); doi: 10.1117/12.605523
Show Author Affiliations
Graham Thursby, Univ. of Strathclyde (United Kingdom)
Fengzhong Dong, Univ. of Strathclyde (United Kingdom)
Brian Culshaw, Univ. of Strathclyde (United Kingdom)
Guido Massaro, Airborne Development (Netherlands)
Branko Glisic, SMARTEC SA (Switzerland)
Daniele Inaudi, SMARTEC SA (Switzerland)


Published in SPIE Proceedings Vol. 5758:
Smart Structures and Materials 2005: Smart Sensor Technology and Measurement Systems
Eric Udd; Daniele Inaudi, Editor(s)

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