反射相移对法拉第镜式OCT影响的理论研究

为了减小块状玻璃电流传感头中线性双折射与反射相移等互易效应产生的有害影响,提出了一种利用法拉第反射镜构成的具有折返传感光路的光学电流互感器方案.采用矩阵理论分析了该方案的光学工作过程,在不计线性双折射的条件下,当反射相移单独存在时,用仿真方法研究了反射相移对法拉第镜式光学电流互感器输出光偏振态的影响,并与单层保偏膜式方案进行了对比.结果表明,法拉第镜式光学电流互感器方案可以解决由反射相移引起的系统输出光偏振态椭圆退化问题,提高了光学电流互感器的灵敏度和温度稳定性.这对于改进现有块状玻璃电流互感器的性能、开发实用型光学电流互感器具有一定的参考意义.

Influence of reflection-induced retardation upon Faraday mirror-typed optical current transformers

A Faraday mirror-typed optical current transformer with returning optical paths was proposed to reduce negative influences from the reciprocal effects of reflection-induced retardation(RIR) and linear birefringence inside a bulk glass current sensing head.The optical working process was analyzed by Jones matrix.The effect of reflection induced retardance on the polarization state of the output light was investigated when linear birefringence was not considered,and a comparison between this new Faraday mirror-typed optical current transformer method and a single film polarization-maintaining method was also presented.The results show that the Faraday mirror-typed optical current transformer method can solve the problem of polarization state degeneration of the output light caused by RIR,so that the sensitivity and temperature stability of optical current transformer is increased.The significance of this method lies in improving the performance of the present bulk glass optical current transformer and developing new kinds of optical current transformers for practical applications.