单片机控制的光学电流互感器偏振调制效应

带有永磁薄膜的石榴石是光学电流互感器的敏感元件。文中介绍了带有永磁薄膜的石榴石和未带膜的石榴石分别在单片机的控制下旋转,旋转的过程中同时观察和记录DOP的值,而DOP(偏振度)是光束中偏振部分的光强度和整个光强度之比。实验得出:无镀膜的石榴石对入射激光的偏振性没有影响,但带有薄膜的石榴石不仅可调制入射光的偏振特性,且调制的DOP值域范围相对于光通过无序介质等方法更大,研究结果为石榴石型光电式电流互感器的测量精度及结构改进提供了理论基础。

Research on Polarization Modulation Effect of Optical Current Transformer Controlled by MCU

The garnet with grooved films (Ta (50 nm)/Nd2Fe14B (500 nm)/Ta (50 nm),Ta (50 nm)/Nd2Fe14B (1 000 nm)/Ta (50 nm) grooved films) is the sensitive element of the optical current transformer.Degree of polarization (DOP) is the ratio of the light intensity of polarization section and the entire section of the light intensity.The rotating garnet controlled by MCU has no effect on degree of polarization of incident beam;however,rotating garnet with grooved films is capable of modulating the polarization of the laser beam.And DOP domain by this method is larger than that of light passing through disordered medium.The results provide a theoretical basis both for the measurement accuracy of the garnet-type photoelectric current transformer and structural improvements.