Elimination of temperature cross-sensitivity for polymer FBG-based humidity sensor by gamma radiation treatment

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

doi:10.1117/12.2671965

30 May 2023 Elimination of temperature cross-sensitivity for polymer FBG-based humidity sensor by gamma radiation treatment

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

Author Affiliations +

Proceedings Volume 12573, Specialty Optical Fibres; 1257315 (2023) https://doi.org/10.1117/12.2671965
Event: SPIE Optics + Optoelectronics, 2023, Prague, Czech Republic

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Abstract

We demonstrate elimination of temperature sensitivity for fiber Bragg gratings (FBGs) in polymer perfluorinated (CYTOP) fiber by gamma radiation treatment. Several FBG samples inscribed line-by-line in a few-mode fiber with 20-µm CYTOP core and 250-µm XYLEX overclad received gamma radiation doses in the range from 80 to 520 kGy. Initially positive value of temperature sensitivity (19.6 pm/℃) decreased with received dose with subsequent change of sign from positive to negative. Among the irradiated samples, the one that received 200-kGy dose demonstrated the closest to zero temperature sensitivity (≈ 1 pm/℃). Along with a decrease of temperature sensitivity, we observed an increase of RH sensitivity with received dose from 13.3 pm/%RH for pristine FBG up to 56.8 pm/%RH for the case of 520 kGy dose. Thus, gamma radiation treatment of CYTOP FBGs provides decrease of their temperature sensitivity and increase of RH sensitivity simultaneously. Correct selection of the irradiation dose allows to eliminate temperature sensitivity for RH sensing application.

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Ivan Chapalo, Andrei Gussarov, Karima Chah, Andreas Ioannou, Andreas Pospori, Ying-Gang Nan, Kyriacos Kalli, and Patrice Mégret "Elimination of temperature cross-sensitivity for polymer FBG-based humidity sensor by gamma radiation treatment", Proc. SPIE 12573, Specialty Optical Fibres, 1257315 (30 May 2023); https://doi.org/10.1117/12.2671965

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