Title :
Development of Highly Radiation Resistant Fiber Bragg Gratings
Author :
Henschel, Henning ; Grobnic, Dan ; Hoeffgen, Stefan K. ; Kuhnhenn, Jochen ; Mihailov, Stephen J. ; Weinand, Udo
Author_Institution :
Fraunhofer Inst. for Tech. Trend Anal., Euskirchen, Germany
Abstract :
Fiber Bragg gratings with a radiation-induced wavelength shift of <;5 pm up to gamma doses of 1 MGy were written with a femtosecond IR laser into Ge-free radiation hard optical fibers. At -50°C the wavelength shift is only about a factor of two higher. After a dose of 1 MGy their tensile stress sensitivity decreased by about 4%. However, it is still necessary to improve their stability before they can be used for temperature and stress sensing in high radiation dose environments.
Keywords :
Bragg gratings; fibre optic sensors; gamma-ray effects; optical fibres; stress measurement; temperature sensors; Ge free radiation hard optical fibers; femtosecond IR laser; gamma dose; high radiation dose environments; highly radiation resistant fiber Bragg gratings; radiation absorbed dose 1 MGy; radiation induced wavelength shift; stress sensing; temperature -50 degC; temperature sensing; tensile stress sensitivity; Fiber gratings; Gratings; Radiation effects; Sensitivity; Temperature measurement; Temperature sensors; Femtosecond laser; fiber Bragg grating; fiber optic sensor; gamma radiation; grating temperature dependence; radiation effects; recoating; strain sensor; temperature sensor; type I grating; wavelength shift;
Journal_Title :
Nuclear Science, IEEE Transactions on
DOI :
10.1109/TNS.2011.2160204
