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Fibre Bragg gratings as high dose radiation sensors?

: Krebber, K.; Henschel, H.; Weinand, U.

Voet, M. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
17th International Conference on Optical Fibre Sensors. Vol.1 : 23.-27.Mai 2005 in Brügge/Belgien
Bellingham/Wash.: SPIE, 2005 (SPIE Proceedings Series 5855)
ISBN: 0-8194-5855-4
International Conference on Optical Fibre Sensors <17, 2005, Brügge>
Conference Paper
Fraunhofer INT ()
fibre bragg grating; radiation effect; gamma radiation; fibre sensor; radiation sensor; radiation dosimetry

We have measured for the first time the shift of the Bragg wavelength and other parameters of fibre Bragg gratings (FBGs) exposed to gamma-radiation at different wavelengths up to a dose of 100 kGy. The results show that the FBG sensitivity to radiation increases from 820 nm to 1516 nm so that FBGs with higher Bragg wavelength, e.g. 1550 nm, are good candidates for high dose radiation sensing: no saturation was observed up to 100 kGy and the measured wavelength shift was fairly independent on the radiation dose rate.