Capteurs à fibres optiques répartis par effet Brillouin : séparation de la dépendance à température et à la déformation

Abstract : Optical fibers sensors for civil engineering are not a new idea. Their interest is based mainly on the intrinsic properties of optical fibers: electromagnetic neutrality, important capacity of multiplexing and access to long distances of measure. These sensors may cover numerous functions of the traditional sensors: detection, localization and surveillance. Thanks to interactions between the light and the optical fiber, such Brillouin scattering, the optical fiber can be on all its length, a continuously distributed sensor.The phenomenon of Brillouin scattering is well studied due to its big efficiency of scattering, its dependence towards temperature and strain and its pluri-kilometric reach. However, the double sensibility of the Brillouin frequency in temperature and strain is problematic for the simultaneous measurement of these two parameters. We shall present a possibility of discrimination of temperature and strain corresponding to the precisions wished for surveillance health monitoring.
Keywords : Optical fiber
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Yolande Sikali Mamdem. Capteurs à fibres optiques répartis par effet Brillouin : séparation de la dépendance à température et à la déformation. Autre. Télécom ParisTech, 2012. Français. ⟨NNT : 2012ENST0058⟩. ⟨tel-01078365⟩

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