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Distributed crystal fibre sensing for extreme environments

Dalzell, Craig J. and Han, Thomas P. J. and Ruddock, Ivan S. (2010) Distributed crystal fibre sensing for extreme environments. In: Fourth European Workshop on Optical Fibre Sensors, 2010-09-08 - 2010-09-10.

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Distributed sensing of temperature can be achieved by using time-correlated two-photon excited fluorescence (TPF). To assess the extension of this technique to crystal fibres for high temperature applications, various aspects are considered including the two-photon absorption cross-section (delta), dopant density and the geometry of single crystal fibres. By comparing the fluorescence yield for two-photon excitation with that for single-photon excitation of the same transition, d for ruby was measured over the 0.8-1.2 mu m range with maximum room temperature values of 5.9 x 10(-3) GM for e-polarisation and 4.6 x 10(-3) GM for o-polarisation at 840 nm. It is shown that values of this magnitude are adequate for a practical TPF based crystal fibre sensor to be realised.