反射式光纤电流互感器光波偏振态相互转换过程中的误差特性

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摘要反射式光纤电流互感器是建立在光波偏振理论基础上的光学精密仪器, 光波线偏振态与圆偏振态相互转化过程中λ/4波片、光纤感应头、反射镜等关键部件均会导致光波偏振误差。非理想的光波偏振特性引起光波偏振态随机耦合误差, 造成偏振光波之间的串扰, 导致光纤电流互感器测量精度误差。针对光纤电流互感器光波线偏振态与圆偏振态相互转化过程中的光波偏振误差特性, 采用庞加莱球理论及Jones矩阵建立光纤电流互感器光波偏振模型, 分析光纤电流互感器中线偏振态及圆偏振态演变过程；以光纤电流互感器光波偏振模型为基础, 研究λ/4波片、90°相位延迟、传感光纤双折射、反射相位等主要环节对光纤电流互感器测量精度及线性度的影响, 仿真并量化各种误差对R-FOCT性能的影响。

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关键词 ：光纤电流互感器, 偏振误差, 线性度误差, 建模

Abstract：Reflective fiber optic current transducer(R-FOCT) is a kind of precision instrument based on optical polarization and optical interference theory. The key optical components in R-FOCT show error characteristics in conversion between linear polarization state and circular polarization state, including quarter-wave retarder, sensing head and mirror, which induces linearly polarized light wave in polarization maintaining fiber and circularly polarized light wave in sensing fiber to be elliptically polarized light wave. Then nonreciprocal phase shift induced by magnetic field of the current is interrupted by wrong polarization state. Focused on polarization error characteristics during mutual conversion process in fiber optic current transducer, optical polarization error models are built by using Jones matrix and Poincare sphere respectively, investigated the influence of several key error factors on measurement accuracy and linearity of scale factor, including phase delay in quarter-wave retarder, birefringence in sensing head and mirror reflection phase shift error. Finally, the proposed methods are verified by simulation test, and scale factor error characteristics of R-FOCT related with optical polarization errors were quantified. The results verify the feasibility of the proposed research scheme.

Key words： Fiber optic current transducer polarization errors linearity error modeling

收稿日期: 2011-03-14 出版日期: 2013-11-27

PACS:	TM452
	TP212

基金资助:国家自然科学基金(61203192), 江苏省自然科学基金(BK2012326), 高等学校博士学科点专项科研基金, 瞬态光学与光子技术国家重点实验室开放基金 (KLST201108)和微惯性仪表与先进导航技术教育部重点实验室开放基金资助项目。

作者简介: 王立辉男1979年生,博士,副研究员,主要从事光纤光学传感、导航测控等领域的研究。何周男1983年生,博士,主要从事配网智能化及智能电器技术等领域的研究。

引用本文:

王立辉, 何周, 刘锡祥, 闫捷, 李佩娟. 反射式光纤电流互感器光波偏振态相互转换过程中的误差特性[J]. 电工技术学报, 2013, 28(1): 173-178. Wang Lihui, He Zhou, Yan Jie, Liu Xixiang, Yan Jie, Li Peijuan. Error Characteristics in Mutual Conversion Process of Reflective Fiber Optic Current Transducer’s Optical Polarization State. Transactions of China Electrotechnical Society, 2013, 28(1): 173-178.

链接本文:

http://dgjsxb.ces-transaction.com/CN/Y2013/V28/I1/173

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