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Radiation-hardened fiber bragg grating based sensors for harsh environments

 
: Morana, Adriana; Girard, Silvain; Marin, Emmanuel; Perisse, Jocelyn; Genot, Jean S.; Kuhnhenn, Jochen; Grelin, Jerome; Hutter, Lukasz; Melin, Gilles; Lablonde, Laurent; Robin, Thierry; Cadier, Benoit; Mace, Jean-Reynald; Boukenter, Aziz; Ouerdane, Youcef

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IEEE Transactions on Nuclear Science 64 (2017), Nr.1, S.68-73
ISSN: 0018-9499
Englisch
Zeitschriftenaufsatz
Fraunhofer INT ()
temperature sensors; fiber Bragg grating; optical fiber devices; radiation effects; dose-rate effects

Abstract
Fiber Bragg Grating (FBG) based sensors are nowadays used for several applications, but, even if they present advantages for their incorporation into radiation environments, commercial-off-the-shelf devices cannot still be used in harsh conditions. We recently reported a procedure for fabricating FBGs resistant to severe constraints combining both high radiation doses up to MGy levels and operation temperatures exceeding 200°C (RadHard FBGs). Following these results, the European project HOBAN was granted by Kic InnoEnergy with the aim of developing and marketing FBG-based temperature and strain monitoring systems suitable for harsh nuclear environments (350°C temperature and MGy dose levels), with their associated instrumentation devices. In this framework, we present an accurate study about the robustness of the radiation-response of these RadHard FBGs against the main grating inscription parameters. Up to the accumulated X-ray dose of 1 MGy(SiO2), no significant radiation induced Bragg wavelength shift is observed meaning that radiations induce errors below ± 0.4°C in the temperature estimation. Moreover, a study about the dose-rate dependence (1 to 50 Gy/s) of the gratings response is also reported and confirms the high radiation hardness of our RadHard FBGs at all dose rates.

: http://publica.fraunhofer.de/dokumente/N-426061.html