﻿ 光纤传感电流监测中光纤套筒周围的电磁场分布研究
 光学仪器  2014, Vol. 36 Issue (1): 52-57 PDF

Magnetic field sensitivities of optical fiber sleeves for full-fiber optical current sensor
MAO Chenfei, ZHANG Xuedian , CHANG Min, LU Dunke, HOU Yinglong
School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
Abstract: A method of simulating the distribution of magnetic field around the strong current by using the software COMSOL was introduced, and a reliable and practical selective basis for choosing the materials of sleeve around the strong current in the full-fiber optical current sensors was accordingly provided. Based on the Faraday's law of electromagnetic induction, the large current straight conductor model was established by the use of COMSOL software. With the help of this model, the distribution of magnetic field around the strong current was simulated respectively both in theory and in practice. The sleeve material in the fiber optic sensor distribution under different conditions of the magnetic field around the wire showing that the magnetic field is not sensitive to materials made of nickel sleeve placement.
Key words: COMSOL software     strong current     the distribution of magnetic field     full-fiber optical current sensors

1 测量原理 1.1 法拉第效应

1.2 磁场分布计算

 图 1 直线段电流丝在P点产生的磁场示意图 Fig. 1 The diagram of current magnetic field in point P which was placed around the straight line with current

P点处磁场的x,y,z方向的分量分别为:

2 仿真模拟

 图 2 空气层建立模型图 Fig. 2 The establishment of the air layer model

3 结果与讨论

3.1 理想直导线周围的磁场与COMSOL模拟的空气层磁场

 图 3 理想磁场分布和COMSOL模拟之后空气层磁场分布比较图 Fig. 3 The comparison of the ideal magnetic field distribution of air layer and that simulated by the COMSOL

3.2 套筒参数设定

 图 4 套筒与空气层结合之后的模型 Fig. 4 The model of the sleeve combined with air layer

3.3 不同材料对应的磁场分布

 图 5 对比图 Fig. 5 Diagrams of various comparisons

4 结 论

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