Simultaneous temperature and strain measurement with bandwidth and peak of the Brillouin spectrum in LEAF fiber

Liu, Xuan; Bao, Xiaoyi

doi:10.1117/12.887441

Cited by 4 publications

(1 citation statement)

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“…Discriminating and with LEAF, AW or TW only requires one fiber and one interrogation technique. Alternative approaches have been evaluated in the literature (in absence of radiation), using both peak bandwidth and peak central frequency 6,9 , or two independent optical fibers with single peak signatures 7 or using two first central peak frequencies 8 . Discrimination techniques show promising results and needs further investigation considering advantages that they could offer for radiation-rich environments, as the ones associated with nuclear waste repositories 10 where the solution robustness is as important as the global performances achieved in absence of radiations.…”

Section: Introductionmentioning

confidence: 99%

Radiation effects on Brillouin-based sensors: temperature and strain discrimination capability using telecom-grade optical fibers

Perrot

Morana

Marin

et al. 2023

European Workshop on Optical Fibre Sensors (EWOFS 2023)

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We investigate the performances accessible in terms of strain and temperature discrimination using Brillouin Optical Time Domain Analysis combined with the LEAF fiber from Corning, AllWave fiber (AW) from Lucent and TrueWave (TW) fiber from OFS when exposed to γ rays and X-rays up to 1 MGy(SiO2). All these fibers present a multipeak Brillouin Gain Spectrum (BGS) with unique dependencies of each of its peaks over temperature (T) and strain (). The evolution of their T and discrimination capability is investigated to evaluate how radiation affects the sensing performances. High dose irradiation changes the sensor performances through two main effects. First, the Radiation Induced Attenuation (RIA) limits the BGS amplitude, the sensing range and discrimination capability techniques relying on BGS amplitude. Second, radiations modify the Brillouin scattering properties by slightly changing the refractive indices and the acoustic velocities of the silica-based leading to small changes in T and dependencies and also to a limited Radiation Induced Brillouin Frequency Shift (RI-BFS) that causes a direct measurement error. Results exhibit an overall decrease of T and uncertainties through discrimination process after 1 MGy reaching 0.9°C and 29 μ for 0.1 MHz frequency uncertainty for sensors based on the LEAF fiber.

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