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ISSN: 1023-5086

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ISSN: 1023-5086

Scientific and technical

Opticheskii Zhurnal

A full-text English translation of the journal is published by Optica Publishing Group under the title “Journal of Optical Technology”

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DOI: 10.17586/1023-5086-2026-93-06-79-86

УДК: 10.17586/1023-5086-2026-93-06-79-86

Investigation of the influence of the coating material on the sensitivity of a fiber Bragg grating to mechanical strain

Skovorodkina M.V., Dmitriev, A.A., Khomutinnikova L.L., Mamulevich N.V., Volnova D.A., Varzhel, S.V.
For Russian citation (Opticheskii Zhurnal):

Сковородкина М.В., Дмитриев А.А., Хомутинникова Л.Л., Мамулевич Н.В., Вольнова Д.А., Варжель С.В. Исследование влияния материала покрытия волоконной решётки Брэгга на её чувствительность к механическому растяжению // Оптический журнал. 2026. Т. 93. № 6. С. 79–86. http://doi.org/10.17586/1023-5086-2026-93-06-79-86

Skovorodkina M.V., Dmitriev A.A., Khomutinnikova L.L., Mamulevich N.V., Volnova D.A., Varzhel S.V. Investigation of the influence of the coating material on the sensitivity of a fiber Bragg grating to mechanical strain [in Russian] // Opticheskii Zhurnal. 2026. V. 93. № 6. P. 79–86. http://doi.org/10.17586/1023-5086-2026-93-06-79-86

For citation (Journal of Optical Technology):
-
Abstract:

Subject of the study. Fiber Bragg gratings, used in sensors for medicine, robotics, and industry, exhibit high sensitivity to mechanical deformations, which limits their application. Purpose of the work. Development of an encapsulated fiber Bragg gratings structure with reduced tensile sensitivity while maintaining temperature characteristics. Method. Experimental and numerical studies were carried out to investigate the influence of different coating materials on the thermal and mechanical sensitivity of fiber Bragg gratings. The polymers Germocast and RTV655 were applied to the fiber gratings. Main results. It was shown that Germocast provides a rapid thermal response, while the use of RTV655 reduces the fiber Bragg gratings sensitivity to mechanical loads from 13.3 pm/g for uncoated gratings to 2.6 pm/g. At the same time, the thermal response is only slightly affected: the temperature sensitivity increases by just 1.1 pm/°C compared to the uncoated grating. Practical significance. The obtained results enable the development of specialized fiber-optic sensors with selective sensitivity, which are in demand in medicine, robotics, and industry.

Keywords:

fiber Bragg gratings, bending sensitivity, thermal response, fiber optic sensor, encapsulation

Acknowledgements:

the research was carried out within the state assignment of Ministry of Science and Higher Education of the Russian Federation (Project № FSER-2024-0006).

OCIS codes: 060.3735, 060.2370, 060.2300

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