宽动态范围的双正交磁光电流传感器技术

提出了一种新的双正交磁光电流传感器技术，该技术可解决传统磁光电流传感器测量大电流脉冲时仅根据正弦或余弦信号无法唯一确定法拉第偏转角的技术难题。在该传感器中，起偏器的透光轴与两个偏振分束器的S分量偏振方向有0与45的夹角，四路输出信号两两之间有/2的相位差。针对该传感器，提出了大电流脉冲的一种反正切函数数据处理方法，该数据处理方法具有可避开正弦函数的不灵敏区间，从而提高数据处理精度的优点。采用双正交磁光电流传感器与罗果夫斯基线圈对比测量了FP-1装置的短路电流脉冲，两种测试技术的实验结果能很好地吻合,证实该光学电流传感器可有效地测量大电流脉冲。

Dual-orthogonal magneto-optic current sensor with wide dynamic measuring range

A magneto-optic current sensor with a dual-orthogonal configuration is proposed and demonstrated, which can resolve the problem that the value of Faraday rotation angle can not be determined by sine signals or cosine signals when the current pulses under test are high. In this dual-orthogonal configuration, the transmission axis of the polarizer makes two given angles, which are 0° and 45°, with the orientations of the S-polarized lights of two polarizing cube beam splitters and four outputs of this sensor are in quadrature. The pulse current can be calculated by an arctangent data reduction method, which avoids the insensitive zone of the sine function, where the measurement current has a reduced accuracy. A measurement of the high-current pulse of the FP-1 device is performed, and shows good agreement with theory and that of a calibrated Rogowski coil. Thus high current pulses can be measured by the dual-orthogonal magneto-optic current sensor.