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Fibre Bragg grating sensors

Volanthen, M., Geiger, H., Trundle, K.J. and Dakin, J.P. (1997) Fibre Bragg grating sensors At Optical Fibre Sensor Technologies and Applications, Germany.

Record type: Conference or Workshop Item (Paper)

Abstract

Three different fibre sensor systems using gratings are presented. Firstly, using an acousto-optic tunable filter and closed loop feedback, arrays of fibre Bragg gratings are being used to monitor small-scale perturbations in composite materials by mapping the strain field around a defect. Gratings are also used as distributed sensors by measuring the wavelength as a function of distance. Low-coherence interferometry selects the location under interrogation and a tunable filter measures the local wavelength. An open loop interrogation technique using a commercially available optical coherence domain reflectometer is demonstrated. The reflectivity of the sensor grating is measured as a function of both distance and wavelength. Gratings 40cm long are interrogated and several distributed grating sensors are multiplexed in an array. Thirdly, a new sensing concept using subcarrier fibre gratings (SFGs) has been proposed and modelled. The SFG is a periodic reflective array resonant at RF frequencies. The resonance may be measured using subcarrier interferometry. Modelling has demonstrated the SFG to have superior performance over other subcarrier sensors

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More information

Published date: June 1997
Additional Information: Invited
Venue - Dates: Optical Fibre Sensor Technologies and Applications, Germany, 1997-06-01

Identifiers

Local EPrints ID: 76777
URI: http://eprints.soton.ac.uk/id/eprint/76777
PURE UUID: 4515f938-aac7-4a59-8ca4-3df85e58d87f

Catalogue record

Date deposited: 11 Mar 2010
Last modified: 18 Jul 2017 23:37

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Contributors

Author: M. Volanthen
Author: H. Geiger
Author: K.J. Trundle
Author: J.P. Dakin

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