Development of a fiber-optic temperature sensor with chirped Bragg gratings, based on modulation of the intensity of optical radiation

Voloshina, A.L., Korobkova U.R., Konnov, D.A., Varzhel, S.V., Karpov E.E.

For Russian citation (Opticheskii Zhurnal):

Волошина А.В., Коробкова У.Р., Коннов Д.А., Варжель С.В., Карпов Е.Е. Разработка волоконно-оптического датчика температуры на базе чирпированных решёток Брэгга, основанного на модуляции интенсивности оптического излучения // Оптический журнал. 2024. Т. 91. № 12. С. 84–90. http://doi.org/10.17586/1023-5086-2024-91-12-84-90

Voloshina A.L., Korobkova U.R., Konnov D.A., Varzhel S.V., Karpov E.E. Development of a fiber-optic temperature sensor with chirped Bragg gratings, based on modulation of the intensity of optical radiation [in Russian] // Opticheskii Zhurnal. 2024. V. 91. № 12. P. 84–90. http://doi.org/10.17586/1023-5086-2024-91-12-84-90

For citation (Journal of Optical Technology):

Abstract:

Subject of study. Fiber-optic temperature sensor that works by measuring the reflected power of optical radiation. Aim of study. Development of a fiber-optic temperature sensor based on chirped fiber Bragg gratings, working on measuring the power of reflected optical radiation. Method. The fiber-optic temperature sensor is a brass probe, inside of which there are two chirped Bragg gratings. One of the diffraction structures is additionally placed in a steel capillary and has higher temperature sensitivity than the second structure. When exposed to temperature, modulation of the overlap of the spectra of the first and second Bragg gratings occurs, which makes it possible to detect changes in the power of optical radiation reflected from the structures. Main results. A method is being developed to create a fiber-optic temperature sensor that works by measuring the intensity of optical radiation. The sensor's designed operating range is –20 °C to +80 °C. When conducting a temperature experiment in the range from –20 °C to +80 °C in steps of 10 °C, the sensor sensitivity is –0.015 dB/°C. The error in temperature measurement using the developed sensor is 1.0% compared to measuring the parameter with a thermocouple. The deviation of the sensor readings at a stable temperature is estimated at 0.06 °C. Practical significance. The developed temperature sensor meets the global trend in the development of cost-effective solutions. The method of measuring optical intensity modulation allows the use of a readily available interrogation scheme that eliminates expensive equipment such as an optical spectrum analyzer or interrogator. The advantages of this survey method are also the high speed of data recording, a relatively simple circuit and low requirements for operating conditions.

Keywords:

chirped fiber Bragg grating, fiber optic sensor, temperature sensor, spectral overlap, power measurement, intensity measurement, temperature measurement

OCIS codes: 060.0060, 060.2310, 060.3735

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