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Theses

Développement de fibres optiques et guides d'ondes infrarouges dédiés à la surveillance des sites de stockage du CO2

Abstract : CO2 capture and storage is a solution to fight climate change. This work reported in this thesis, concerns infrared optical fibers and thin films development dedicated to monitoring CO2 in storage wells. Chalcogenide glasses are unique materials with a large transparency window in the mid-infrared and good rheological properties. The development of thin films belonging to the Ge-Sb-S and Ge-Sb-Se systems, prepared by RF-sputtering or pulsed laser deposition, has been described. Properties of thin films have been compared to find the best composition for the realisation of a micro-sensor. Sulphide thin films, deposited by sputtering were chosen. Dry etching was used to pattern rib and Y-junction waveguides. Different optical fiber profiles, such as single index fibers, tapered fibers or microstructured fibers, have been produced in selenide glasses. An important work on glass purification led to a low attenuation of 0.2 dB/m at 4.2 µm. A detection threshold of about 0.5 vol. %,was obtained using the infrared signal absorption between two single index fibers This technique has been adapted for a first series of measurement on site, in Sainte-Marguerite, in the Puy-de-Dôme, in natural CO2 sources.
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Submitted on : Tuesday, January 5, 2010 - 5:21:13 PM
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  • HAL Id : tel-00443994, version 1

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Frédéric Charpentier. Développement de fibres optiques et guides d'ondes infrarouges dédiés à la surveillance des sites de stockage du CO2. Matériaux. Université Rennes 1, 2009. Français. ⟨tel-00443994⟩

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