Investigation of Coating Impact on OFDR Optical Remote Fiber-Based Sensors Performances for Their Integration in High Temperature and Radiation Environments
Résumé
The response of OFDR-based temperature sensors is here investigated in harsh environments (high temperature, high radiation dose) focusing the attention on the impact of the fiber coating on the sensor performances in such environments. Our results demonstrate that the various coating types evolve differently under thermal treatment and/or radiations, resulting in a small (<5%) change in the temperature coefficient of the sensor. We identified a procedure allowing improving the sensor performances in harsh environments. This procedure consists in a pre-thermal treatment of the radiation tolerant fibers at its maximum coating operating temperature. This allows stabilizing the temperature coefficients when the fiber is exposed to the harsh constraints. Finally, we show that radiation does not affect scattering phenomenon, CT coefficients remain identical within 1% fluctuations up to 10 MGy, and that permanent RIA reached values stands for the development of high-spatial resolved distributed temperature for harsh environment associated with high temperature (up to 300 °C) and ionizing radiation up to the MGy dose level.
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