Development and study of a fiber-optic temperature sensor based on a Fabry–Perot interferometer obtained by welding optical fibers

Konnov, D.A., Kazachkova, I.D., Savin V.V., Voloshina, A.L., Konnov, K.A., Plotnikov, M.Y., Varzhel, S.V.

Publication in Journal of Optical Technology

For Russian citation (Opticheskii Zhurnal):

Коннов Д.А., Казачкова И.Д., Савин В.В., Волошина А.Л., Коннов К.А., Плотников М.Ю., Варжель С.В. Разработка и исследование волоконно-оптического датчика температуры на основе интерферометра Фабри–Перо, полученного методом сварки оптических волокон // Оптический журнал. 2023. Т. 90. № 9. С. 64–72. http://doi.org/10.17586/1023-5086-2023-90-09-64-72

Konnov D.A., Kazachkova I.D., Savin V.V., Voloshina A.L., Konnov K.A., Plotnikov M.Y., Varzhel S.V. Development and study of a fiber-optic temperature sensor based on a Fabry–Perot interferometer obtained by welding optical fibers [in Russian] // Opticheskii Zhurnal. 2023. V. 90. № 9. P. 64–72. http://doi.org/10.17586/1023-5086-2023-90-09-64-72

For citation (Journal of Optical Technology):

D. A. Konnov, I. D. Kazachkova, V. V. Savin, A. L. Voloshina, K. A. Konnov, M. Y. Plotnikov, and S. V. Varzhel, "Development and studies of a fiber-optic temperature sensor based on a Fabry–Perot interferometer obtained by welding optical fibers," Journal of Optical Technology. 90(9), 528-532 (2023). https://doi.org/10.1364/JOT.90.000528

Abstract:

Subject of study. Fiber-optic temperature sensor based on a Fabry–Perot interferometer obtained by welding optical fibers. Aim of study. Development and study of a temperature sensor based on a fiber-optic Fabry–Perot interferometer obtained by arc welding and its temperature study. Method. The design of the temperature sensor is implemented on the basis of a Fabry–Perot interferometer obtained by welding optical fibers, the reflecting mirrors of which are layers of thin films of titanium dioxide. The interferometer interrogation method is based on the use of a vertically emitting laser operating in the pulsed generation mode. The principle of registering the phase shift between the radiation reflected from the interferometer mirrors with a change in temperature is based on the auxiliary modulation of the laser radiation wavelength due to a periodic change in the pulse duration. Main results. During the temperature study of the developed sensor, the phase characteristics of the Fabry–Perot interferometer were obtained in the temperature range from +20 to +380 °С. A shift of the operating point was registered with a change in the ambient temperature. Based on the results of the experiment, it was concluded that an increase in the ambient temperature leads to an increase in the phase difference between the radiation reflected from the first and second mirrors of the interferometer. It is shown that the phase sensitivity to temperature change is 0.96, 1.68, and 2.35 rad/°C at distances between mirrors of 5, 8, and 11 mm respectively. Practical significance. The proposed fabrication method for the Fabry–Perot interferometer provides ample opportunities for the formation of a resonator with different lengths, and also makes it possible to exclude the use of additional materials in its design. Due to this, the interferometer has small weight and size parameters, which makes it possible to use it in a wide range of applications, including as a sensitive element of a temperature sensor. The sensor interrogation method used in the work makes it possible not to use expensive spectral measuring instruments (optical spectrum analyzers, interrogators).

Keywords:

Fabry–Perot interferometer, temperature sensor, phase sensitivity, phase shift, interferometer sensitivity

OCIS codes: 120.2230, 050.2230

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