Operation simulation of a distributed fiber optic current sensor using Brillouin scattering

For Russian citation (Opticheskii Zhurnal):

Янукович Т.П., Исмайилова А.С. Моделирование работы распределённого оптоволоконного сенсора силы тока с использованием рассеяния Мандельштама–Бриллюэна // Оптический журнал. 2024. Т. 91. № 10. С. 25–33. http://doi.org/10.17586/1023-5086-2024-91-10-25-33

Yanukovich T.P., Ismayilava A.S. Operation simulation of a distributed fiber optic current sensor using Brillouin scattering [in Russian] // Opticheskii Zhurnal. 2024. V. 91. № 10. P. 25–33. http://doi.org/10.17586/1023-5086-2024-91-10-25-33

For citation (Journal of Optical Technology):

Abstract:

Subject of study. Distributed fiber optic current sensor based on Brillouin scattering on the basis of fiber deformation. Aim of study. Simulation of Brillouin scattering in an optical fiber in the presence of deformation caused by the Ampere force to calculate the parameters of the current sensor. Method. Calculation of the transfer function for a three-wave interaction of a pump wave, a probe wave and an acoustic wave, taking into account the characteristic amplification factors of stimulated Mandelstam–Brillouin scattering. Main results. The operation of a current sensor based on Brillouin scattering was simulated. The value of the transfer function is studied, the effect of temperature exposure is considered when using optical fiber with the addition of germanium oxide. The operation of the sensor was simulated with a limiting value of the measured current of 50 kA, as well as obtaining a sensitivity of 72 A. The possibility of reducing the measurement time by reducing the range of modulation frequency changes. The range 100 kHz – 300 MHz with a spatial resolution of 0.5 m with an increment of frequency of 100 kHz with a fiber length of 500 m was chosen. Practical significance. A simulation was carried out to estimate the parameters of the measuring system based on the mathematical model of stimulated Mandelstam–Brillouin scattering in an optical fiber. The spatial resolution of the sensor when determining the length and location of fiber sections is 0.5 m when using amplitude modulation of the optical signal in the range from 100 kHz to 700 MHz with a sensitive fiber length of 500 m. The resolution of the sensor is 72 A at the difference between the pump and test radiation frequencies Δf = 500 kHz, maximum current value 50 kA at a difference in frequencies of pump and test radiation Δf = 50 MHz, which is twice the maximum value of the measured current in previously announced sensors of this type.

Keywords:

stimulated Brillouin scattering, optical fiber, current sensor

OCIS codes: 060.2370, 290.5830

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