针对红外波段下湿度对偏振光传输特性的影响问题, 以自然界中较常见的烟煤粒子作为研究对象, 采用蒙特卡洛法仿真研究, 不同红外波段下湿度对线偏光和圆偏光传输特性的影响情况及其之间差异特性.结果表明：在短波波段, 线偏光与圆偏光的偏振度随湿度的增加都呈现逐渐上升的趋势; 在中波波段, 随湿度的增加两种偏振光都呈现下降趋势; 而在长波波段, 湿度对偏振状态几乎没有影响.进一步比较可知, 在短波波段, 圆偏光具有更好的偏振特性, 而在中长波情况下, 线偏光的偏振特性更加显著.因此, 在应用红外偏振进行探测时, 本研究对波段的选取、湿度的控制及偏振态的应用具有重要的指导意义.

For the influence problem of the humidity on polarization transmission character under infrared wavebands, this paper applies Monte Carlo simulation for the common carbonaceous aerosol particles existing in nature. The influence of humidity on polarization transmission characteristics and polarization character difference under infrared wavelengths is researched. The results indicate that the Degree of Polarization (DOP), both linear and circular polarization, gradually rises with the increasing of humidity in the short wave bands; In the medium wave bands, the DOP of them descends with the increasing of the humidity; In long wave bands, the influence of relative humidity on DOP is minimal. To compare linear polarization with circular polarization, we demonstrate that the latter always performs better than the former in the short wave bands, whereas the former maintains its better polarization state. Therefore, in infrared polarization applications these conclusions introduce a method for the wavelength selection, humidity controlling and polarization state application.