Development and research of a fiber-optic temperature sensor based on a regenerated fiber Bragg grating

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 регенерированной волоконной брэгговской решетки // Оптический журнал. 2024. Т. 91. № 5. С. 66–71. http://doi.org/10.17586/1023-5086-2024-91-05-66-71

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] // Opticheskii Zhurnal. 2024. V. 91. № 5. P. 66–71. http://doi.org/10.17586/1023-5086-2024-91-05-66-71

For citation (Journal of Optical Technology):

Abstract:

Subject of study. Fiber-optic temperature sensor based on a regenerated fiber Bragg grating. Aim of study. Development of a high temperature sensor based on a regenerated fiber Bragg grating and conducting its temperature study up to a temperature of 1000 ^оC. Method. The regenerated fiber Bragg grating is obtained by annealing in a high-temperature muffle furnace with a “seed” fiber Bragg grating recorded on hydrogenated optical fiber SMF-28, at a continuously rising temperature from room temperature to 920 ^оC (regeneration temperature in the case of SMF-28 fiber). The reflection coefficient of the “seed” grating is as close as possible to 100%, the structure length is 15 mm. Heating rate 500 ^оC/hour. Main results. During the work and temperature studies, which were carried out in the temperature range from +25 to +1000 ^оC in steps of 100 ^оC, a fiber-optic temperature sensor was developed based on a regenerated fiber Bragg grating with a reflectance of about 50%, the temperature sensitivity of which was 14,9 pm/^оC. Practical significance. The proposed method for manufacturing regenerated fiber Bragg gratings makes it possible to use them as a sensitive element of a temperature sensor. Its ability to operate at such high temperatures opens up wide possibilities for use in a huge range of industrial applications (for example, gas turbine engines, power plants, steel mills, etc.). The simplicity of its implementation makes it possible to obtain a fiber-optic temperature sensor without the use of additional equipment and material costs.

Keywords:

fiber Bragg grating, regeneration, temperature sensor, high-temperature measurements, temperature sensitivity

OCIS codes: 120.2230, 050.2230

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