利用光环路镜作为反射元件的全光纤电流传感器

All-optical Fiber Current Sensor with Reflector Based on Nonlinear Optical Loop Mirror

为解决反射式全光纤电流传感器中引入全反射镜而产生的反射损耗及与光纤匹配困难等问题,设计了一种利用非线性光环路镜作为反射元件的全光纤电流传感器,推导出了光偏振态的斯托克斯矢量与电流的关系式,提出了高速偏振态检测方法.在加载0～200 A的50 Hz工频交流电的条件下进行了实验,测试结果与理论预测吻合,显示出了较高的测量精确性,证明了该传感结构与实验方案的可行性.

For the reflecting optical fiber current sensors, the introduction of total reflection mirror will reault in reflection loss and difficulty of matching optical fiber, so a type of reflecting all-fiber current sensor using nonlinear optical loop mirror as the reflector was designed, the relationship between the Stokes vector of light polarization and the current was derived, and a method of high-speed polarization detection was presented. An experiment was carried out under the condition of loading 0 - 200 A 50 Hz AC. The experimental result is consistent with the theoretical prediction, showing that the sensor has high measurement accuracy, which proves the feasibility of the proposed sensing structure and experiment scheme.