Modeling and analysis of vibration characteristics of all fiber current sensor

Yansong Li; Ying Han

doi:10.1117/12.2614497

15 October 2021 Modeling and analysis of vibration characteristics of all fiber current sensor

Yansong Li, Ying Han

Proceedings Volume 11933, 2021 International Conference on Neural Networks, Information and Communication Engineering; 119332A (2021) https://doi.org/10.1117/12.2614497
Event: 2021 International Conference on Neural Networks, Information and Communication Engineering, 2021, Qingdao, China

Abstract

The vibration error mathematical model of all fiber optical current sensor (FOCS) is established. The propagation of vibration in optical fiber waveguide is analyzed theoretically, and the mechanism of linear birefringence caused by vibration is explained in essence: the stress changes in optical fiber caused by vibration propagation to optical fiber, and the linear birefringence is caused by photoelastic effect. In addition, the wavelength fluctuation caused by vibration wave propagation will cause the change of Verdet constant of the sensing fiber, which will also affect the output accuracy of FOCS. COMSOL finite element method is used to realize the coupling analysis of light field and magnetic field, sound field and stress field. The simulation results show that: the linear birefringence effect will reduce the rotation angle of the polarization plane of the incident light, and the vibration propagates to the sensing fiber, causing uneven stress distribution in the cross section of the fiber. The stress difference on the cross section of the fiber is positively correlated with the vibration frequency and amplitude. Combined with Verdet constant, the comprehensive error of FOCS under the influence of vibration is obtained, and the optimization suggestions are given.

Citation Download Citation

Yansong Li and Ying Han "Modeling and analysis of vibration characteristics of all fiber current sensor", Proc. SPIE 11933, 2021 International Conference on Neural Networks, Information and Communication Engineering, 119332A (15 October 2021); https://doi.org/10.1117/12.2614497

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