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研究了兼有电光效应和磁光效应的晶体内电光与磁光效应的互补特性及其传感应用.在光强度调制条件下,晶体中偏振光波的电光调制与磁光调制具有互相补偿的效果,从而能够使输出光强度保持为一个固定值.基于这种互补特性,提出了一种利用单块闪烁锗酸铋(Bi4Ge3O12,BGO)晶体的电光补偿型光学电流(磁场)传感器,其光学传感单元由两个偏振器和一块平行四边形BGO晶体组成.该晶体自身能够产生π/2的光学相位偏置,同时兼用作电流传感和电光补偿元件,通过控制BGO晶体的外加电压,能够实时补偿被测电流(磁场)变化引起的磁光旋转角和输出光强度的变化,从而实现电流(磁场)的闭环光学测量.实验测量了5.0 A范围内的工频交流电流,所需要的电光补偿电压约为21.2 V/A,补偿电压与被测电流之间具有良好的线性关系,其非线性误差低于1.7%.
The complementary characteristics of electro-optic and magneto-optical effect and its sensing applications are studied both in the electro-optic and magneto-optical effects.In electro-optic modulation and magneto-optic modulation, the polarized wave in crystal has the effect of mutual compensation , So that the intensity of output light can be kept at a fixed value.Based on this complementary characteristic, an electro-optic compensated optical current (magnetic field) sensor using single blinking germanium bismuth (Bi4Ge3O12, BGO) crystal is proposed, The sense cell consists of two polarizers and a parallelogram BGO crystal that itself produces an optical phase offset of π / 2 and also serves as a current sensing and electro-optical compensation element that can be controlled in real time by controlling the applied voltage of the BGO crystal Compensate the change of magneto-optic rotation angle and output light intensity caused by the change of measured current (magnetic field), so as to realize the closed-loop optical measurement of current (magnetic field) .According to the experiment, the AC- The voltage is about 21.2 V / A, the compensation voltage and the measured current has a good linear relationship between the nonlinear error of less than 1.7%.