51, 120601(2014)
激光与光电子学进展
Laser & Optoelectronics Progress
©2014《中国激光》杂志社
120601-1
光纤陀螺保偏光纤环几何轴向磁敏感性理论研究
王夏霄
1
秦 祎
1
*
于 佳
1
王 野
2
吕江涛
3
周先贵
4
1
北京航空航天大学仪器科学与光电工程学院, 北京 100191
2
中国科学院信息工程研究所, 北京 100093
3
中国航天科工集团第九总体设计部, 湖北 武汉 430040
4
中国航天科工集团第四研究院红峰控制有限公司, 湖北 孝感 432000
摘要 在光纤陀螺中,磁场会造成法拉 第相位误差。实验结果表 明 ,轴向磁敏感性较 径向更为明显。在轴向磁 场 作
用下,在保编光纤中传播的正反两束光会产生一个与磁场有关的非互易相位差。研究了由光纤在光纤环上螺旋缠绕
引起的几何轴向磁敏感性,利用耦合模方程和有限元分析法,从理论上推导出了保偏光纤陀螺在轴向磁场作用下,产
生的几何法拉第非互易相位差的具体表 达式,并对理论结果进行了仿真分析。研究表明,光 纤环中光纤几何扭转引
起的圆双折射是产生几何法拉第相位误差的主要原因。另外,轴向磁敏感性会随着半径的减小而增大。
关键词 光纤光学; 几何轴向磁敏感性; 耦合模理论; 光纤陀螺; 法拉第效应; 扭转
中图分类号 TN25 文献标志码 A doi: 10.3788/LOP51.120601
Study on Geometrical Axial Magnetic Field Sensitivity in PM
Optical Fiber Coil of Fiber Optic Gyroscope
Wang Xiaxiao
1
Qin Yi
1
Yu Jia
1
Wang Ye
2
Lü Jiangtao
3
Zhou Xiangui
4
1
School of Instrument Science & Optoelectronic Engineering, Beihang University, Beijing 100191, China
2
Institute of Information Engineering, Chinese Academy of Sciences, Beijing 100093, China
3
The Ninth Overall Design Department, China Aerospace Science& Industry Corp, Wuhan, Hubei 430040, China
4
Hongfeng Control CO, LTD of the Fourth Research Institute, China Aerospace Science& Industry Corp, Xiaogan,
Hubei 432000, China
Abstract The magnetic field in fiber optic gyroscope (FOG) will cause Faraday effect, resulting in Faraday
phase error. Experimental results show that the axial magnetic field sensitivity is more obvious than the radial
magnetic field sensitivity. The clockwise (CW) and coienter- clockwise (CCW) light which propagate in the
polarization maintain (PM) fiber in Fiber- optic gyro will generate a nonreciprocal phase error associated with
axial magnetic field. In this paper, the geometrical axial magnetic field sensitivity caused by helically wounded
optical fiber is studied; coupled- mode theory and finite element analysis are used to induce the FOG′s specific
expression of Faraday nonreciprocal phase difference generated in axial magnetic field. The simulation analysis
is given based on the theoretical results. Research show that circular birefringence caused by the geometrical
torsion in the fiber of the fiber coil is the main causes of the geometry Faraday phase error. Furthermore, the
study results show that axial magnetic field sensitivity will increase with decreasing radius.
Key words fiber optics; geometrical axial magnetic field sensitivity; coupled-mode theory; fiber optic gyro;
Faraday effect; twist
OCIS codes 060.2310; 060.2800
1 引 言
光纤陀螺的基本原理是 Sagnac 效应
[1]
。载体相对惯性空间转动,会在光纤陀螺的闭合光路中产生一个
收稿日期: 2014-07-07; 收到修改稿日期: 2014-07-10; 网络出版日期: 2014-10-31
作者简介: 王夏霄(1977—),男,博士,讲师,主要从事光纤陀螺及光纤电力传感技术等方面的研究。
E-mail: wangxiaxiao@buaa.edu.cn
* 通信联系人。E-mail: qy19910216@126.com