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==Master's degree == * MPhil Optical Distributed Sensing Methods, ORC, University of Southampton, UK. * Thesis: Microwave Detection Techniques Applied to Temperature and Strain Sensing of Optical Fibres. This research developed a microwave detection system for coherent detection of spontaneous Brillouin-based distributed temperature and strain measurements. The system was designed to overcome the existing bandwidth limitations of a previously used commercial spectrum analyser and provide a commercially practical solution to the detection of the Brillouin frequency shift and intensity for long range high spatial resolution measurements. The detection system bandwidth corresponded to a potential spatial resolution of ~60 cm. The system was demonstrated as a temperature sensor over a range of 30 km, with a temperature resolution of 1.6 °C and spatial resolution of ~2 m. It was also demonstrated as a combined temperature and strain sensor over a range of 6.3 km with ~1.3 m spatial resolution; temperature and strain resolutions of 3 °C and 80 ”Δ respectively were achieved. Cette recherche a dĂ©veloppĂ© un systĂšme de dĂ©tection aux hyperfrĂ©quences pour la dĂ©tection cohĂ©rente des mesures distribuĂ©es de tempĂ©rature et de tension, basĂ©e sur la diffusion Ă lâeffet Brillouin. Le systĂšme a Ă©tĂ© conçu afin de surmonter les limitations de la largeur de bande dâune analyse de spectre, disponible dans le commerce, et ainsi fournir une solution pratique pour ce type de dĂ©tection, tout en allongeant la distance de dĂ©tection. La rĂ©solution ainsi fournie par le nouveau systĂšme offrait une rĂ©solution spatiale potentielle de 0.6m. Une rĂ©solution de tempĂ©rature de 1.6 °C a Ă©tĂ© mesurĂ©e avec une rĂ©solution spatiale de 2m sur une longueur de 30km. Le systĂšme a pu Ă©galement ĂȘtre utilisĂ© pour des mesures simultanĂ©es de tempĂ©rature et de tension sur une longueur de 6.3km, permettant une rĂ©solution spatiale de 1.3m, une rĂ©solution de tempĂ©rature de 3°C et de tension de 80 ”Δ.
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