11 January 1999 Radiation hardness of fiber optic sensors for monitoring and remote handling applications in nuclear environments
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We report on our irradiation experiments on different types of fiber-optic sensors, including three types of commercially available temperature sensors, a multimode extrinsic Fabry-Perot cavity strain sensor and fiber Bragg- gratings. For the temperature sensors, results show that gamma radiation does not interfere with the basic sensing mechanism and that the most critical component turns out to be the optical fiber itself. Semiconductor absorption temperature sensor showed no degradation up to total doses of 250 kGy, whereas the specifications of Fabry-Perot type sensor and fluorescence temperature sensors were already dramatically influenced below the kGy-level. Replacing the optical fiber by a more radiation resistant version allowed to increase the radiation hardness of the fluorescence sensors system by orders of magnitude. The use of fiber- optic sensors in the presence of neutron radiation remains compromised. Similar conclusions are valid for the Fabry- Perot type fiber-optic strain sensors. We finally show that the Bragg-grating resonance wavelength can shift with radiation dose, but that the temperature sensitivity remains unaltered.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Francis Berghmans, Francis Berghmans, Alberto Fernandez Fernandez, Alberto Fernandez Fernandez, Benoit Brichard, Benoit Brichard, Frans Vos, Frans Vos, Marc C. Decreton, Marc C. Decreton, Andrei I. Gusarov, Andrei I. Gusarov, Olivier Deparis, Olivier Deparis, Patrice Megret, Patrice Megret, Michel Blondel, Michel Blondel, Serge Caron, Serge Caron, Andre Morin, Andre Morin, } "Radiation hardness of fiber optic sensors for monitoring and remote handling applications in nuclear environments", Proc. SPIE 3538, Process Monitoring with Optical Fibers and Harsh Environment Sensors, (11 January 1999); doi: 10.1117/12.335757; https://doi.org/10.1117/12.335757

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