烟雾环境下的偏振差成像方法

基于激光主动成像的烟雾环境下的目标探测具有重要研究意义,有效抑制光的散射作用是提高烟雾环境下成像质量的关键。根据光的偏振理论,仿真分析了光子单次散射的偏振特性与散射角的变化关系,并利用蒙特卡罗方法模拟了光在烟雾环境中传输的偏振特性,提出了利用偏振差法来抑制光散射作用,最后进行了简单的成像实验。结果表明,光在烟雾中传输时散射光主要由小角度散射光构成,仍然保留了初始激光的部分偏振特性,相比于直接灰度成像,偏振差法能够有效滤除小角度散射光的影响,增强成像目标的细节信息和图像的对比度。

Polarization difference imaging method in smoke environment

Target detection in smoke environment using laser active imaging is of great significance. Suppressing scattering effect of light effectively is the key to improve the imaging quality. According to the polarization theory of light, the polarization characteristics of a single-scattering photon changing with the scattering angle is analyzed, and the polarization characteristics of light transmitting in the smoke environment is simulated. The polarization difference method is proposed to suppress scattering light and an imaging experiment is set up at last. It is shown that when light is transmitting in smoke, the scattering light is mainly made up of small-angle scattering light, which still retains the initial polarization characteristics of the incident light. Compared with the direct imaging method, the polarization difference method can effectively filter out the influence of small-angle scattering light and enhance the detailed information of imaging target and the image contrast.