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Effects of high temperature and pressure on silica optical fibre sensors

By J.R. Clowes, J. McInnes, M.N. Zervas and D.N. Payne


We report on the effects of liquids at high temperature and pressure on silica optical fibres, sensors and gratings. We propose that the diffusion of molecules into the silica and the resultant expansion of the network are responsible for observed fibre expansions of up to 0.2% and Bragg wavelength increases of 2nm at 1525nm. Amorphous carbon hermetic coating has shown a reduction of these effects by an order of magnitude at 300°C. These results have strong implications for the deployment of fibre sensors in oil wells

Topics: QC, TK
Year: 1998
OAI identifier:
Provided by: e-Prints Soton

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