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- W4361278390 abstract "In this paper, we investigate the accessible performances in terms of strain and temperature discrimination using Brillouin Optical Time Domain Analysis (BOTDA) combined with the LEAF fiber (from Corning) when exposed to γ-rays up to doses of 1 MGy(SiO2). This optical fiber offers a multipeak Brillouin Gain Spectrum (BGS) with unique dependencies of each of its peaks over temperature and strain. The discrimination capability evolution of LEAF is investigated at high γ doses and dose rates to evaluate the radiation effects on the sensing performances. Gamma irradiation leads to modifications of the LEAF BGS signature through two main effects. First, the Radiation Induced Attenuation (RIA) of this germanosilicate optical fiber limits the BGS amplitude, sensing range and capability for discrimination over BGS amplitude. Second, radiations modify the Brillouin scattering properties by slightly changing the refractive indices and the acoustic velocities of the fiber core and cladding leading to a small change in temperature and strain dependences as well as a limited Radiation Induced Brillouin Frequency Shift (RI-BFS) causing a direct error on the measured parameters. Results exhibit an overall decrease of temperature and strain uncertainties through discrimination process after 1 MGy irradiation reaching 0.9°C and 29με for 0.1 MHz frequency uncertainty." @default.
- W4361278390 created "2023-03-31" @default.
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- W4361278390 date "2023-07-01" @default.
- W4361278390 modified "2023-09-25" @default.
- W4361278390 title "Preface to the special issue on fiber optic biosensors" @default.
- W4361278390 doi "https://doi.org/10.1016/j.yofte.2023.103307" @default.
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