Open AccessCoupled temperature and γ-radiation effect on silica-based optical fiber strain sensors based on Rayleigh and Brillouin scatterings
Author(s) -
Arianna Piccolo,
Sylvie Delépine-Lesoille,
M. Landolt,
Sabine Girard,
Y. Ouerdane,
C. Sabatier
Publication year - 2019
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.021608
Subject(s) - rayleigh scattering , brillouin scattering , brillouin zone , materials science , optics , attenuation , optical fiber , distributed acoustic sensing , radiation , atmospheric temperature range , temperature measurement , strain (injury) , fiber optic sensor , physics , medicine , quantum mechanics , meteorology
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.