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2007-12-20 - Travail avec promoteur/Doctorat - Anglais - 242 page(s)

Caucheteur Christophe , "Realization of mechanical and chemical sensors based on the fiber Bragg gratings technology", Mégret Patrice (p) , soutenue le 2007-08-20

  • Codes CREF : Capteurs et périphériques (DI2563), Sciences de l'ingénieur (DI2000), Optique des fibres (électromagnétisme) (DI1252), Physique (DI1200), Métrologie (DI2160)
  • Jury : Olivier Marie-Georges (p) , Krebber K., Taki M., Capmany J., Thienpont H., de Haan André, Wuilpart Marc , Fotiadi Andrei
  • Unités de recherche UMONS : Electromagnétisme et Télécommunications (F108)

Abstract(s) :

(Anglais) The past decade has witnessed intensive research and development efforts to engineer a new class of optical fiber components: the fiber Bragg gratings. While the main driving force has come from the need for new, highperformance fiber grating devices, such as wavelength division multiplexing (WDM) filters, erbium-doped fiber amplifier (EDFA) gain equalizers and dispersion compensators to boost the bandwidth available in high-speed telecommunication optical networks, the use of fiber gratings has found an important place in the world of sensors. Fiber Bragg gratings sensors possess many advantages over conventional electric and alternative optical fiber sensor configurations. They are relatively straightforward, inexpensive to produce, immune to electromagnetic interference, small in size and self-referencing with a linear response. Most significantly, their wavelength-encoding multiplexing capability allows to cascade tens of fiber gratings in a single optical fiber. The combination of their multiplexing capability and their inherent compatibility with fiber-reinforced composite materials allows them to be embedded in various structural materials for smart structure applications. This leads to improvements in both safety and economics in many engineering fields, including major civil works, tunnels, dams, road and rail bridges, aerospatial and medical applications. This thesis has focused on the realization of mechanical and chemical sensors based on fiber Bragg gratings. The research program has first consisted in the implementation of different writing techniques in a clean room environment to write uniform and tilted fiber Bragg gratings as well as long period fiber gratings. For that purpose, a frequency-doubled argon-ion laser emitting at 244 nm has been used. A numerical program has then been developed to reconstruct the parameters of fiber Bragg gratings from the amplitude measurement of their reflected/transmitted spectrum. Although it works with non-uniform grating profiles, this program has mainly been applied to uniform fiber Bragg gratings and has been useful for the study of the polarization properties of these gratings.