Study of the hydrogen influence on the acoustic velocity of single-mode fibers by Rayleigh and Brillouin backscattering measurements

S. Leparmentier; J. L. Auguste; G. Humbert; G. Pilorget; L. Lablonde; Sylvie Delepine-Lesoille

doi:10.1117/12.2194102

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28 September 2015 Study of the hydrogen influence on the acoustic velocity of single-mode fibers by Rayleigh and Brillouin backscattering measurements

S. Leparmentier, J. L. Auguste, G. Humbert, G. Pilorget, L. Lablonde, Sylvie Delepine-Lesoille

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Proceedings Volume 9634, 24th International Conference on Optical Fibre Sensors; 963432 (2015) https://doi.org/10.1117/12.2194102
Event: International Conference on Optical Fibre Sensors (OFS24), 2015, Curitiba, Brazil

Abstract

We study the effect of hydrogen gas diffusion in silica optical fibers on Brillouin and Rayleigh scatterings. By modeling hydrogen diffusion kinetics as a function of temperature and pressure and by measuring simultaneously Rayleigh and Brillouin scattering on G652 single-mode fiber samples during H₂ desorption (previously exposed to 175 bars H₂ at 80°C), we have demonstrated experimentally that acoustic velocity increases linearly with H2 concentration with a ratio of about (4.8 m/s) / (%mol H₂).

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S. Leparmentier, J. L. Auguste, G. Humbert, G. Pilorget, L. Lablonde, and Sylvie Delepine-Lesoille "Study of the hydrogen influence on the acoustic velocity of single-mode fibers by Rayleigh and Brillouin backscattering measurements", Proc. SPIE 9634, 24th International Conference on Optical Fibre Sensors, 963432 (28 September 2015); https://doi.org/10.1117/12.2194102

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