CAJ | 학술논문

分析了基于法拉第调制的线偏振光旋转角检测技术的基本原理，证明输出信号基频分量的振幅与偏振面旋转角θ成正比，仿真发现基频分量远小于零频和二倍频分量，需采用锁相放大技术进行基频信号提取。实验采用 ZF7玻璃和 TG28晶体作为旋光介质，分别制作了标准旋转角产生装置和偏振面调制装置，并结合锁相放大器搭建偏振光旋转角检测系统。实验结果证明，当法拉第调制频率为1．45 kHz、调制幅度为0．035 rad 时，该方法可以实现6．3×10－8 rad 的微小偏转角检测。
분석료기우법랍제조제적선편진광선전각검측기술적기본원리，증명수출신호기빈분량적진폭여편진면선전각θ성정비，방진발현기빈분량원소우령빈화이배빈분량，수채용쇄상방대기술진행기빈신호제취。실험채용 ZF7파리화 TG28정체작위선광개질，분별제작료표준선전각산생장치화편진면조제장치，병결합쇄상방대기탑건편진광선전각검측계통。실험결과증명，당법랍제조제빈솔위1．45 kHz、조제폭도위0．035 rad 시，해방법가이실현6．3×10－8 rad 적미소편전각검측。
The principle of linearly polarized light rotation based on Faraday modulation is analyzed.The results indicated that the output amplitude of fundamental frequency component is proportional to optical rotationθ.But the fundamental frequency component,which is less than zeroth-order and second-order frequency component, need be extracted by lock-in amplification technique.The ZF7 glass and TG28 crystal are used as the standard optical rotation and polarization modulation devices.The measurement system of linearly polarized light rotation is built by a lock-in amplifier.When the modulation frequency is 1.45 kHz and modulation magnitude is 0.035 rad,the experimental results show that the method can examine the angle of 6.3×10-8 rad.