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Development of highly radiation resistant fiber Bragg gratings

 
: Henschel, Henning; Grobnic, Dan; Höffgen, Stefan Klaus; Kuhnhenn, Jochen; Mihailov, Stephen J.; Weinand, Udo

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IEEE Transactions on Nuclear Science 58 (2011), Nr.4, Pt.2, S.2103-2110
ISSN: 0018-9499
Englisch
Zeitschriftenaufsatz
Fraunhofer INT ()
femtosecond laser; fiber Bragg grating; fiber optic sensor; gamma radiation; grating temperature dependence; radiation effect; recoating; strain sensor; temperature sensor; type-I grating; wavelength shift

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.

: http://publica.fraunhofer.de/dokumente/N-183412.html