Method and apparatus for generation and transmission of high...

G - Physics – 01 – D

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G01D 5/353 (2006.01) G01D 5/26 (2006.01) G01K 11/32 (2006.01)

Patent

CA 2515705

A method and apparatus for generating and transmitting high energy optical pulses are described. Distributed temperature sensors usually use Raman scattering in optical fibres as the means to determine the temperature. Here, light from a laser source is sent down a fibre and the small amount of light that is scattered back towards the source is analysed. As the fibre length increases, the resolutions of the temperature and loss measurements become poorer. This is because losses in an optical fibre attenuate the signal. An obvious solution to this problem is to launch more light into the fibre to compensate for the losses but stimulated Raman scattering limits how much light may be launched. The present invention solves this problem by using a pulse conversion method to maximise the resultant pulse energy while the power is kept below SRS threshold.

L'invention concerne un procédé et un dispositif permettant de produire et de transmettre des impulsions optiques de haute énergie. Des capteurs thermiques répartis utilisent de manière générale l'effet Raman en matière de fibres optiques comme moyen pour déterminer la température. Selon l'invention, de la lumière provenant d'une source laser est envoyée de manière descendante sur une fibre et la faible quantité de lumière diffusée en retour vers la source est analysée. A mesure que la longueur de la fibre augmente, les résolutions de la température et les mesures de pertes deviennent plus faibles, ce qui est dû au fait que les pertes intervenant dans la fibre optique affaiblissent le signal. Une solution évidente pour remédier à ce problème est d'envoyer davantage de lumière dans la fibre, afin de compenser les pertes, mais l'effet Raman stimulé limite la quantité de lumière devant être envoyée. A cet effet, il est prévu, selon l'invention, pour pallier ce problème, d'utiliser le procédé de conversions d'impulsions afin de maximiser l'énergie pulsée qui en résulte, la puissance étant maintenue en dessous du seuil SRS.

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