Liquid crystal magnetic field optical fiber sensor

Gordeeva A.I., Gilev V.G., Nurmukhametov D.I., Pankov A.S., Ponomaryov, R.S.

For Russian citation (Opticheskii Zhurnal):

Гордеева А.И., Гилев В.Г., Нурмухаметов Д.И., Паньков А.С., Пономарев Р.С. Жидкокристаллический датчик магнитного поля на основе оптического волокна // Оптический журнал. 2026. Т. 93. № 5. С. 90–99. http://doi.org/10.17586/1023-5086-2026-93-05-90-99

Gordeeva А.I., Gilev V.G., Nurmuhametov D.I., Pankov A.S., Ponomarev R.S. Liquid crystal magnetic field optical fiber sensor [in Russian] // Opticheskii Zhurnal. 2026. V. 93. № 5. P. 90–99. http://doi.org/10.17586/1023-5086-2026-93-05-90-99

For citation (Journal of Optical Technology):

Abstract:

Scope of research. The metrological characteristics of a fiber-optic magnetic field sensor made in the form of a micron-sized cavity filled with a nematic-cholesteric mixture or a 5CB nematic. The purpose of the work. The development of a fiber-optic magnetic field sensor using liquid crystals as a sensing element and the study of its characteristics, as well as the identification of patterns that can subsequently be used in the serial production of fiber-optic sensors based on liquid crystals. The method. The measurement of the rotation angle of the optical radiation polarization plane passing through a liquid crystal, when introducing a sensitive element into a region of a varying strength magnetic field, was carried out using the polarimetric method. The main results. The task of remote and high-precision measurement of magnetic field strength has been completed. The basic principles of operation and the block diagram of the sensitive part of the liquid crystal magnetic field sensor are presented. The results of testing of working elements made at the end of an isotropic and anisotropic optical fiber filled with a nematic-cholesteric mixture or nematic 5CB are presented. The test results of the optical fiber-based liquid crystal magnetic field sensor correspond to the stated purpose of the study, namely the measurement of magnetic field strength. Practical significance. The results of the study will allow solving scientific and applied tasks related to remote monitoring of the magnetic field.

Keywords:

fiber-optic sensor, liquid crystals, nematic-cholesteric mixture, magnetic field, polarized radiation

Acknowledgements:

the study was financially supported by the Ministry of Education and Science of the Russian Federation within the framework of the State Task № FSNF-2024-0001 “Development of the element base of photonic systems for telecommunications and sensor applications”

OCIS codes: 230.0230, 130.6010, 230.5440

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