We report a method for fabricating fiber Bragg gratings (FBG) resistant to very severe environments mixing high radiation doses (up to 3 MGy) and high temperatures (up to 230°C). Such FBGs have been written in two types of radiation resistant optical fibers (pure-silica and fluorine-doped cores) by exposures to a 800 nm femtosecond IR laser at power exceeding 500 mWand then subjected to a thermal annealing treatment of 15 min at 750°C. Under radiation, our study reveals that the radiation induced Bragg wavelength shift (BWS) at a 3 MGy dose is strongly reduced compared to responses of FBGs written with nonoptimized conditions. The BWS remains lower than 10 pm for temperatures of irradiation ranging from 25°C to 230°C without noticeable decrease of the FBG peak amplitude. For an applicative point of view, this radiation induced BWS corresponds to an additional error on the temperature measurements lower than 1.5°C, opening the way to the development of radiation-tolerant multi-point temperature sensors for nuclear industry.

Morana, A., Girard, S., Marin, E., Marcandella, C., Paillet, P., Périsse, J., et al. (2014). Radiation tolerant fiber Bragg gratings for high temperature monitoring at MGy dose levels. OPTICS LETTERS, 39, 5313-5316 [0.1364/OL.39.005313].

Radiation tolerant fiber Bragg gratings for high temperature monitoring at MGy dose levels

MORANA, Adriana;CANNAS, Marco;
2014

Abstract

We report a method for fabricating fiber Bragg gratings (FBG) resistant to very severe environments mixing high radiation doses (up to 3 MGy) and high temperatures (up to 230°C). Such FBGs have been written in two types of radiation resistant optical fibers (pure-silica and fluorine-doped cores) by exposures to a 800 nm femtosecond IR laser at power exceeding 500 mWand then subjected to a thermal annealing treatment of 15 min at 750°C. Under radiation, our study reveals that the radiation induced Bragg wavelength shift (BWS) at a 3 MGy dose is strongly reduced compared to responses of FBGs written with nonoptimized conditions. The BWS remains lower than 10 pm for temperatures of irradiation ranging from 25°C to 230°C without noticeable decrease of the FBG peak amplitude. For an applicative point of view, this radiation induced BWS corresponds to an additional error on the temperature measurements lower than 1.5°C, opening the way to the development of radiation-tolerant multi-point temperature sensors for nuclear industry.
Morana, A., Girard, S., Marin, E., Marcandella, C., Paillet, P., Périsse, J., et al. (2014). Radiation tolerant fiber Bragg gratings for high temperature monitoring at MGy dose levels. OPTICS LETTERS, 39, 5313-5316 [0.1364/OL.39.005313].
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/10447/97146
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