光学电流互感器传感头色散特性对系统灵敏度影响研究

以琼斯矩阵为数学工具，利用理论分析和计算机仿真的方法研究了块状玻璃光学电流互感器传感头的色散特性对系统灵敏度的影响,并进行了实验验证.在光学电流互感器系统中，光源的驱动电流与环境温度改变，都会造成光源峰值波长移动.而在传感头中主要是由单层保偏反射膜的反射相移、光学玻璃的Verdet常数以及光学玻璃内的线性双折射这三个因素的色散特性，使得光学电流互感器的灵敏度随光源波长的变化而改变.研究结果表明，这种色散特性会对输出曲线的尺度因子产生明显的影响.因此，光源的恒温控制与光源驱动电流的恒流控制是必要的.本研究结果可为光学电流互感器的研究设计人员提供有用的参考.

Study of the Effect of the Sensing Head Dispersion Property Upon the Sensitivity of a Bulk-glass Optical Current Transformer

The dispersion property of the optical glass sensing head and its effect upon the sensitivity of a bulk-glass optical current transformer were theoretically analyzed by taking the Jones′ Matrix as a mathematical tool, simulated with a computer and verified with an experiment. In an optical current sensing system,when the fluctuations of the driving current or the ambient temperature of the optical source occurs, the peak wavelength of the source would change.It would result in the fluctuation of the sensitivity of the system because of the existing of the dispersions of the reflection-induced retardance,Verdet constant and the linear birefringence inside the sensing head.The investigation results showd that the dispersions would obviously affect the scale factor of the system.Therefore,it was necessary to stabilize the driving current and the ambient temperature of the optical source by some technical means.These results might be useful for the researchers and designers who works in the optical current sensin