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为消除块状光学玻璃型电流传感器中反射相移对测量精度的影响,提出了一种折射率呈梯度分布的环形磁光玻璃传感头结构。该环形磁光玻璃的内外两侧均为折射率渐变层,中间为折射率均匀层。同时,为便于信号光的输入输出耦合,该环形磁光玻璃上有一定大小的开口。理论分析表明,在一定条件下,光线在环形磁光玻璃中传播时,可不再与玻璃和空气界面接触,从而可以有效地避免反射相移的影响,提高传感器的测量精度。通过数值模拟分析了环形磁光玻璃的结构参数对光线传播轨迹以及有效初始角的影响。结果表明,通过合理设计环形磁光玻璃的结构参数,可以得到具有较大有效初始角且无反射相移的高灵敏度磁光玻璃型电流传感器。
In order to eliminate the influence of reflection phase shift on measurement accuracy in bulk optical glass type current sensor, a ring magneto-optical glass sensor head structure with gradient distribution of refractive index is proposed. The annular magneto-optical glass has a refractive index gradient layer on both the inner and outer sides and a uniform refractive index layer in the middle. Meanwhile, in order to facilitate the input-output coupling of the signal light, the annular magneto-optical glass has a certain size of opening. The theoretical analysis shows that under certain conditions, the light can no longer contact with the interface between glass and air when it propagates through the ring magneto-optical glass, so that the influence of reflection phase shift can be effectively avoided and the measurement accuracy of the sensor can be improved. The influence of the structural parameters of toroidal magneto-optic glass on the ray propagation trajectory and the effective initial angle was analyzed by numerical simulation. The results show that a high sensitivity magneto-optic glass current sensor with a large effective initial angle and no reflection phase shift can be obtained by reasonably designing the structural parameters of the toroidal magneto-optical glass.