Mesure dynamique de déformation par rétrodiffusion Brillouin spontanée B-OTDR

Abstract : Today, three distinct and complementary technologies are available for distributed temperature, strain or vibration measurements with the analysis of Raman, Brillouin and Rayleigh backscattered light. Current industrial needs are distributed strain measurements for linear infrastructures, such as pipelines, for which linear and real-time strain distribution is required. The research work aims to design a new distributed and dynamic strain measurement system based on the analysis of spontaneous Brillouin backscatter by reflectometry. Slope assisted technique is used to accelerate the measurement acquisition, currently limited to static events because of their actual principle of sweep frequency acquisition of the Brillouin backscattering spectrum. The experimental results are characterized and validated by the simulation of the measurements of the deformation and displacement of a pipe supported between two simple supports. A mechanical model, adapted to this configuration and transposable on real projects, is developed. Through Cementys industrial partner, this model is then used for two monitoring project of pipelines with different installation facilities and purpose.
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  • HAL Id : tel-02055990, version 1

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Damien Maraval. Mesure dynamique de déformation par rétrodiffusion Brillouin spontanée B-OTDR. Mécanique des structures [physics.class-ph]. Télécom ParisTech, 2017. Français. ⟨NNT : 2017ENST0023⟩. ⟨tel-02055990⟩

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