Temperature and RH response of polymer CYTOP FBG treated by gamma radiation

Ivan Chapalo; Andrei Gusarov; Karima Chah; Andreas Ioannou; Andreas Pospori; Ying-Gang Nan; Kyriacos Kalli; Patrice Mégret

doi:10.1117/12.2678326

23 May 2023 Temperature and RH response of polymer CYTOP FBG treated by gamma radiation

Ivan Chapalo, Andrei Gusarov, Karima Chah, Andreas Ioannou, Andreas Pospori, Ying-Gang Nan, Kyriacos Kalli, Patrice Mégret

Author Affiliations +

Proceedings Volume 12643, European Workshop on Optical Fibre Sensors (EWOFS 2023); 1264305 (2023) https://doi.org/10.1117/12.2678326
Event: European Workshop on Optical Fibre Sensors (EWOFS 2023), 2023, Mons, Belgium

Abstract

Polymer fiber Bragg grating (FBGs) demonstrate a wider strain range and stronger temperature sensitivity compared to standard silica FBGs. Besides, their advantageous feature is sensitivity to humidity that enables FBG-based relative humidity (RH) sensing. However, practical realization of RH sensors requires temperature cross-sensitivity elimination. A certain optimal fiber pre-strain and gamma irradiation of perfluorinated (CYTOP) FBGs up to certain optimal dose are potential recently proposed solutions for this problem. In this work, we investigate temperature and RH response of FBGs inscribed line-by-line in a few-mode polymer fiber with 20-μm CYTOP core and 250-μm XYLEX overclad. We compare the cases of the pristine FBG sample and the sample received 200 kGy irradiation dose. The 200-kGy dose was previously confirmed to provide temperature sensitivity minimization at 40%RH. Here, we show the close-to-zero temperature sensitivity (≈1pm/°C) for 200-kGy dose at high RH value of 89%. Besides, we briefly analyze the stabilization process of FBGs response to strong and quick RH changes.

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Ivan Chapalo, Andrei Gusarov, Karima Chah, Andreas Ioannou, Andreas Pospori, Ying-Gang Nan, Kyriacos Kalli, and Patrice Mégret "Temperature and RH response of polymer CYTOP FBG treated by gamma radiation", Proc. SPIE 12643, European Workshop on Optical Fibre Sensors (EWOFS 2023), 1264305 (23 May 2023); https://doi.org/10.1117/12.2678326

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