用光学方法测量电力系统中的物理量

为了探讨用光学方法测量电力系统中的物理量，根据琼斯矩阵法推出了电光效应与磁光效应组合光调制的公式。结果表明检偏器的输出光强中含有电流、电压和电功率信息。当把光信号变成电信号后经信号处理可用来测量高压（或大电流）情况下的电流、电压和电功率。当主要测量电压和功率时，可选择电光调制在前、磁光调制在后的组合光调制系统；当主要测量电流或电压时，可选择磁光调制在前、电光调制在后的组合光调制系统。

Optical method for measuring physical quantities in electric system

The paper points out optical method for measuring physical quantities in electric system.With the method of Jones matrix,formulas for intensity of transmitted light through the optical analyzer of various composition of electro-optic effect with magneto-optic effect are derived.The results show that the output light intensity from the analyzer carries information of electric current,electric voltage and electric power.If the signal of light intensity is transformed into electric signal,and is treated by electric circuit,the current,voltage and power can be measured when the voltage is high and/or the current is large.When the main measuring items are voltage and power,selecting this measuring method,namely electro-optic modulation first and magneto-optic modulation furthermore,is suitable.When the main measuring items are current or voltage,selecting the measuring method in the way of magneto-optic modulation first and electro-optic modulation second is suitable.