Development and research of a fiber-optic temperature sensor based on the superposition of two regenerated fiber Bragg gratings

Konnov, D.A., Kazachkova, I.D., Konnov, K.A., Kulikova, V.A., Varzhel, S.V.

For Russian citation (Opticheskii Zhurnal):

Коннов Д.А., Казачкова И.Д., Коннов К.А., Куликова В.А., Варжель С.В. Разработка и исследование волоконно-оптического датчика температуры на основе суперпозиции двух регенерированных волоконных брэгговских решёток // Оптический журнал. 2024. Т. 91. № 12. С. 63–69. http://doi.org/10.17586/1023-5086-2024-91-12-63-69

Konnov D.A., Kazachkova I.D., Konnov K.A., Kulikova V.A., Varzhel S.V. Development and research of a fiber-optic temperature sensor based on the superposition of two regenerated fiber Bragg gratings [in Russian] // Opticheskii Zhurnal. 2024. V. 91. № 12. P. 63–69. http://doi. org/10.17586/1023-5086-2024-91-12-63-69

For citation (Journal of Optical Technology):

Abstract:

Subject of study. Fiber optic temperature sensor based on the superposition of two regenerated fiber Bragg gratings. Aim of study. Development of a fiber-optic temperature sensor from +25 to +1000 °C based on the superposition of two regenerated Bragg gratings and determination of its temperature sensitivity. Method. A superposition of two standard 14 mm long fiber Bragg gratings with reflectivities of 90% and 70% was heated (heating rate 500 °C/hour) from room temperature to a regeneration temperature of 920 °C (for G.657.A2 standard optical fibers), which was maintained until the formation of the regenerated structure was complete. Main results. During the development and temperature studies, which were carried out in the temperature range from +25 to +1000 °C with a step of 100 °C, a fiber-optic temperature sensor was implemented based on the superposition of two regenerated fiber Bragg gratings with reflection coefficients of about 40% and 30%, and their temperature sensitivity was established as 12.7 and 12.72 pm/°C, respectively. Practical significance. For the first time, a superposition of two regenerated fiber Bragg gratings with reflection coefficients of more than 40% and 30% was obtained. The developed sensor based on such a structure allows using a larger range of measured temperatures with a limited range of interrogated radiation wavelengths. In addition, the dependence of the temperature sensitivity of a regenerated fiber Bragg grating on its central reflection wavelength was established for the first time.

Keywords:

fiber Bragg grating, superposition of fiber Bragg gratings, regeneration, temperature sensor, high-temperature measurements, temperature sensitivity

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: 120.2230, 050.2230

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Konnov D.A., Kazachkova I.D., Konnov K.A., Kulikova V.A., Varzhel S.V. Development and research of a fiber-optic temperature sensor based on a regenerated fiber Bragg grating [in Russian] // Journal of Optical Technology. 2024. V. 91. № 5. P. 66–71. http://doi. org/10.17586/1023-5086-2024-91-05-66-71