Fiber-optic method for identification of various substances by their thermal characteristics

Varzhel, S.V., Klishina, V.A., Kulikova, V.A.

For Russian citation (Opticheskii Zhurnal):

Клишина В.А., Варжель С.В., Куликова В.А. Волоконно-оптический метод идентификации различных веществ по их тепловым характеристикам // Оптический журнал. 2023. Т. 90. № 4. С. 105–114. http:doi.org/10.17586/1023-5086-2023-90-04-105-114

Klishina V.A., Varzhel S.V., Kulikova V.A. Fiber-optic method for identification of various substances by their thermal characteristics // Opticheskii Zhurnal. 2023. V. 90. № 4. P. 105–114. http:doi.org/10.17586/1023-5086-2023-90-04-105-114

For citation (Journal of Optical Technology):

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Abstract:

Subject of study. This work is devoted to the research and development of a fiber-optic method for identifying a substance by its thermal characteristics and determining the phase of a substance in a gas-liquid mixture flow. Aim of study. The purpose of this work is to develop a fiber-optic sensing element with a single compact design and the possibility of remote measurements for identifying a substance by its thermal characteristics using standard telecommunication fibers. The work also requires studies of dynamic systems with the changing phases of matter using fully fiber-optic technologies. Method. The hot wire method with implementation of fiber optics elements is used in the work. The creation of the heating area was realized by forming the structure of the taper in the optical fiber, and for measurements a fiber Bragg grating was formed, which acts as a temperature sensor. Main results. In the course of the work, a new scientific and technical solution was developed to create a fiber-optic sensitive element for identifying a substance by its thermal characteristics. The experiments were carried out for six samples with a specific heat capacity range of 1.0–4.2 kJ/(kg K), according to the results obtained, the dependences of the spectral shift of the resonance of the fiber Bragg grating on the values of the specific heat capacities of substances were plotted, the maximum standard deviation was 0.0088 nm. The results of identifying the phase of a gas-liquid mixture in moving flows are also presented. Practical significance. The results of the work are of scientific interest to the researchers in the areas requiring the analysis of samples with different thermal characteristics, determining the phase change in moving flows, detecting the presence of impurities in the flows of known substances, measuring the level of liquids, etc.

Acknowledgment: the work was carried out with the financial support of the Priority 2030 program.

Keywords:

fiber Bragg grating, hot wire method, fiber optic sensors, definition of various substances, measurement of thermal characteristics, specific heat capacity measurement

OCIS codes: 060.3735, 060.2370, 120.0280, 120.6810

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