法拉第镜式光学电流互感器研究
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摘要
实用型光学电流互感器(Optical Current Transformer:OCT)的研究与开发将对我国输电工业产生深刻的影响,这正是本论文选题的重要意义所在。
     OCT是电子式电流互感器(Electrical current transformer:ECT)中的一大类。由于其在技术上的先进性,电力计量行业对OCT的需求也极为迫切。然而,光学电流互感器技术至今仍处于向实用化研究的进程之中,OCT技术的实用化研究中依旧充满困难和挑战。其中线性双折射、反射相移对输出光偏振态的影响问题是块状玻璃电流互感器实用化的核心技术问题之一。
     论文中提出了一种具有折返传感光路的法拉第镜式光学电流互感器(Faraday mirror-typed optical current transformer:FMOCT)方案;采用矩阵理论分析和仿真了该方案的全部光学工作过程;结果表明:FMOCT可以很好地解决上述核心技术问题,并能使灵敏度提高一倍。文中采用计算机仿真的方法,分别研究了线性双折射、反射相移单独存在及共同存在时对FMOCT输出光偏振态的影响;分别分析了FMOCT中两个关键器件“法拉第镜(FM)”和“无偏振效应分束器(NPBS)”的特征参数对系统输出光束偏振态的影响;通过实验手段,研究了温度变化和外磁场变化对FM和NPBS各自特征参数的影响。分析了FMOCT的光耦合技术理论,给出了FMOCT光路的工艺性设计;用实验方法研究了温度对光学耦合系统的影响,测量了主要传感元件的温度性能,研究了输入输出光耦合系统的综合温度变化规律。
     这些工作对于实用型光学电流互感器的研发具有一定的参考意义。
The profound influence of investigation and exploitation of the practical Optical Current Transformer (OCT) upon the industry of power delivery in our country will be brought in the future. It is just about the significance of choosing this subject.
    OCT is a kind of the Electrical Current Transformer (ECT). On account of its advanced technology, the requirement of OCT in electrical metrology industry is very urgent. However, to this day, the technology of OCT is still on the road to practical research and full of difficulties and challenges. The questions on the effects of linear birefringence and reflection-induced retardance upon the polarization state of the output light are ones of the kernel technology problems during the practical application of the bulk glass current transformer.
    A project of Faraday mirror-typed optical current transformer (FMOCT) with turn-back optical paths is proposed in this paper. All the optical processes are analyzed and simulated using matrix theory. The results show that FMOCT can solve above technology problems very well and double the sensitivity. By the way of computer simulation, the effects of linear birefringence or reflection-induced retardance or both of them upon the polarization state of the output light are investigated, the effects of the characteristic parameters of two important appliances of FMOCT, Faraday mirror (FM) and non-polarization beam spliter (NPBS), upon the polarization state of the output light are analyzed. Besides, the influences of temperature and stray magnetic field upon the characteristic parameters of FM and NPBS are also analyzed experimentally. At the same time, light coupling technology theory for FMOCT is also studied. Processing design of the optical paths of the FMOCT is given, too. Investigating the effects of
引文
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