空间调制型全Stokes参量偏振成像系统原理及仿真

Principle and Simulation of a Spatially Modulated Full Stokes Parameters Polarization Imaging System

空间调制型全Stokes参量偏振成像是针对同一目标不同偏振分量的同时探测技术,以双折射晶体作为调制元件,将Stokes参量S0~S3调制在同一幅图像中,只一次采集便可获得包含4个Stokes参量的调制信息。分析空间调制型全Stokes偏振成像系统的探测原理和数学模型。阐明重构偏振图像S0~S3的理论依据,并分析了系统参数的选择对图像重构效果的影响。根据实际系统参数,进行数值仿真模拟成像过程,获取调制图像,使用一种简单的频域解调算法,重构出S0~S3的4幅偏振图像,得到比较满意的重构效果,不仅验证了方案的可行性,同时为仪器设计或器件选型提供参考。

This paper introduces a new polarization detecting method which uses a birefringent crystal to encode the two- dimensional Stokes quantities S0-S3 into an image, so that it obtains the information of four Stokes quantities with a single detection. The paper presents the working principle and mathematical model of the polarimeter. Also, the reconstructing method, as well as the effect of system parameters is theoretically demonstrated. The encoded image is obtained from numerical simulation according to real system configuration. By using a simple algorithm, we get acceptable reconstructed images which verifies the feasibility and provides references for the design.