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弹光调制器(Photoelastic Modulator,PEM)互差频调制的新型偏振测量方法,能够同时实现三个斯托克斯光谱偏振参数测量,克服了现有方法的无法用阵列探测器有效采集,调制频率高的缺点,保留了原有弹光调制器偏振测量的优点。文章以光学系统的准单色光的偏振特性以及常用的偏振分析方法为基础,引入了Stokes矢量来表示入射光波的偏振特性。分析了弹光调制器实现偏振测量新方法的原理,利用三个弹光调制器工作在互相差异的频率上,对偏振光进行差频调制,产生载有偏振信息的低频分量,再通过锁相放大即可得到偏振信息,并给出利用MATLAB模拟仿真实现Stokes参量复原的过程。理论分析及仿真结果证明了该方法在理论上的可行性。
The new polarization measurement method of Mutual Difference Frequency Modulation (PME) of Photoelastic Modulator (PEM) can simultaneously measure the polarization parameters of three Stokes spectra and overcome the problems that the existing method can not effectively acquire with an array detector. The modulation frequency High disadvantage, retains the advantages of the original light modulator polarization measurement. Based on the polarization characteristics of the quasi-monochromatic light in the optical system and the commonly used polarization analysis methods, Stokes vectors are introduced to represent the polarization characteristics of incident light waves. The principle of a new method of polarization measurement is analyzed. The three kinds of elastic modulators are used to work at different frequencies. The polarized light is modulated by difference frequency to produce the low frequency component with polarization information. Amplification can be obtained polarization information, and the use of MATLAB simulation to achieve Stokes parameter recovery process. Theoretical analysis and simulation results show that the method is theoretically feasible.