与传统电磁式电流互感器相比，基于法拉第效应的光纤电流传感器有许多明显的优点，因而获得了广泛的研究。萨尼亚克(Sagnac)环形电流互感器是在干涉式光纤陀螺结构上发展起来的一种互感器结构。外界环境的振动因素是抑制Sagnac光纤电流互感器的最重要因素之一。为了消除振动对电流互感器测量结果的影响，给出了一种新型的光纤电流互感器免疫方案，其基本原理是增加外部闭环线圈来补偿所受振动影响。利用琼斯矩阵对此种光纤电流互感器结构进行了详细的理论分析。理论分析及实验结果均能证明此种方案可以完全消除电流互感器在实际环境中所受振动因素的不利影响。为高精度Sagnac干涉式光纤电流互感器的实现提供了可行的解决方法。

Optical fiber current sensors based on Faraday effect have a lot of advantages over conventional current sensors and have been studied extensively. The structure of Sagnac optical current sensors are developed on the structure of interferometric fiber-optic gyroscope. The external vibration is one of the most important limitations of Sagnac optical current sensors. To eliminate the effect of vibration, a new scheme is given out. The basic principle of the scheme is that there is an extra closed loop to compensate the vibration effect received by the sensing head. Then the polarization states of the lights spreading in the new scheme are analyzed with Jones matrix. The theoretical analysis and the result of the experiment both show that the novel structure of the optical current sensor could completely eliminate the vibration effect in the environment. It is useful to the high accuracy of Sagnac optical current sensor.