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Coupled temperature and γ-radiation effect on silica-based optical fiber strain sensors based on Rayleigh and Brillouin scatterings

Abstract : Coupled temperature and γ-ray influence on Brillouin (PPP-BOTDA) and Rayleigh (TW-COTDR) scatterings are quantified. Aging tests of these distributed strain measuring systems are performed on-line, up to 1 MGy, at room temperature, 80 ∘C, 100 ∘C and 120 ∘C. Brillouin and Rayleigh frequency shifts remain identical regardless of the temperature: 3 MHz (2 MHz) and 7 GHz (3 GHz) for Ge-doped (respectively F-doped) fiber at 1 MGy. Meanwhile, radiation-induced attenuation is diminished because of the higher temperature; hence, the maximal distance range is less deteriorated. These tests help to explain the origin of the Brillouin frequency shift under γ-rays, with an acoustic velocity variation of about 1 m/s in 1 MGy irradiated samples.
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https://hal-ujm.archives-ouvertes.fr/ujm-02340629
Contributor : Sylvain Girard <>
Submitted on : Wednesday, October 30, 2019 - 10:55:23 PM
Last modification on : Tuesday, October 6, 2020 - 4:30:49 PM

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A. Piccolo, S. Delepine-Lesoille, M. Landolt, S. Girard, Y. Ouerdane, et al.. Coupled temperature and γ-radiation effect on silica-based optical fiber strain sensors based on Rayleigh and Brillouin scatterings. Optics Express, Optical Society of America - OSA Publishing, 2019, 27 (15), pp.21608. ⟨10.1364/OE.27.021608⟩. ⟨ujm-02340629⟩

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