X-ray and high temperature responses of regenerated Fiber Bragg Gratings
Résumé
Fiber Bragg Gratings (FBGs) can be used as non-intrusive and multiplexed temperature or strain sensors with an acquisition rate larger than 1 kHz and a resolution better than 0.1°C and 0.1 με. Regenerated Gratings (RFBGs) can withstand high temperature. Also, radiations induce an additional error of less than 4°C for a total dose of 100 kGy(SiO2) at Room Temperature (RT) and less than 1°C at 250°C for the same total dose. We have inscribed at the CEA List LCFO or at the Laboratory H. Curien, FBGs in three different fibers: two different Ge-doped fibers and one B/Ge co-doped fiber. The gratings were regenerated at respectively 650°C, 900°C and 750°C and then irradiated at Room Temperature (RT) and at 250°C with a dose rate of 10 Gy/s.
The gratings inscribed in the Ge-doped fibers, independently of the Ge content or the inscription and regeneration conditions present similar behavior, with a Bragg Wavelength Shift (BWS) of less than 10 pm (equivalent to ~ 1°C) at a total dose of 100 kGy and for a temperature of 250°C while the grating inscribed in the B/Ge co-doped fiber presents a BWS of more than 60 pm.
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