中文摘要：

利用JG-3型连续可调谐磁场仪搭建实验装置，红外1350nm激光器做光源，测量了偏振光通过磁场作用下BL-009型向列相液晶的透射光强度和旋转角度，详细分析了磁场对液晶透射比和液晶旋光性能的影响，对实验结果进行了理论分析，得出了液晶透射比和旋光角随磁场方向变化的结论。同时，通过实验测试。对液晶的阈值磁场强度进行了讨论。

英文摘要：

The transmission intension and rotation degree of a BL-009 nematic liquid crystal is measured with magnetism controlled by using JG-3 type continuous tunable magnetism device and infrared 1350 nm laser. The effect of magnetic field on the transmission and rotation light capability of liquid crystal Is detailed analyzed. It can be concluded that the transmission and rotation light effect of liquid crystal are changed with the magnetic field effect. At the same time,the threshold of liquid crystal is discussed.