Elliptical degeneration of output light of optical current transformer is caused by linear birefringence and refection-induced retardance,which results in reduction of sensitivity.

• 线性双折射和反射相移使光学电流互感器输出光偏振态产生椭圆退化并导致灵敏度降低,法拉第镜式光学电流互感器可以有效解决椭圆退化问题。