基于矩形波信号的磁光调制偏振测量方法

建立并研究了基于矩形波磁光调制的检偏方法.运用计算机模拟,对矩形波磁光调制的利萨如图形进行了详细考察,研究了其检偏原理,并对其检偏精度进行了分析.研究表明.矩形波磁光调制的利萨如图形由几个离散点组成,通过观察离散点彼此之间是否重合,就可以判断检偏器是否处于消光位置.从而达到检偏的目的.同时,若用电子仪器监测输出信号是否为直流,即可以实现自动检偏.与基于正弦波磁光调制的倍频法相比,矩形波磁光调制方法的检偏精度有了明显提高,并且也容易实现自动测量.

Magneto-Optical Modulation Method for Polarization Measurement Based on Rectangular Wave Signal

A magneto-optical modulation method for optical polarization measurement is proposed based on rectangular wave signal. By means of computer simulation, Lissajou figure of the rectangular wave magneto-optical modulation method was investigated, and the principle and precision of this method were studied. The study indicates that, the Lissajou figure of the rectangular wave magneto-optical modulation method is made up of seceral discrete points. By observing whether the discrete points are superposed each other, it can be judged whether the analyzer is at extinction position, and then polarizaiton analysis can be made. In additon, if monitor whether the output signal wave is direct current with electronic instrument, automatical polarizaiton analysis can be performed. Compared with the frequency doubling method based on sine wave magneto-optical modulation, the rectangular wave magneto-optical modulation method possesses higher precision, and automatical measurement is easier to carry out.