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首页> 外文期刊>Applied optics >Detection range enhancement using circularly polarized light in scattering environments for infrared wavelengths
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Detection range enhancement using circularly polarized light in scattering environments for infrared wavelengths

机译：在红外波长的散射环境中使用圆偏振光增强检测范围

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We find for infrared wavelengths that there are broad ranges of particle sizes and refractive indices that represent fog and rain, where circular polarization can persist to longer ranges than linear polarization. Using polarization tracking Monte Carlo simulations for varying particle size, wavelength, and refractive index, we show that, for specific scene parameters, circular polarization outperforms linear polarization in maintaining the illuminating polarization state for large optical depths. This enhancement with circular polarization can be exploited to improve range and target detection in obscurant environments that are important in many critical sensing applications. Initially, researchers employed polarization-discriminating schemes, often using linearly polarized active illumination, to further distinguish target signals from the background noise. More recently, researchers have investigated circular polarization as a means to separate signal from noise even more. Specifically, we quantify both linearly and circularly polarized active illumination and show here that circular polarization persists better than linear for radiation fog in the short-wave infrared, for advection fog in the short-wave and long-wave infrared, and large particle sizes of Sahara dust around the 4 mu m wavelength. Conversely, we quantify where linear polarization persists better than circular polarization for some limited particle sizes of radiation fog in the long-wave infrared, small particle sizes of Sahara dust for wavelengths of 9-10.5 mu m, and large particle sizes of Sahara dust through the 8-11 mu m wavelength range in the long-wave infrared. (c) 2015 Optical Society of America
机译：对于红外波长，我们发现代表雾和雨的粒径和折射率范围很广，其中圆偏振比线性偏振可以保持更长的范围。使用偏振跟踪蒙特卡洛模拟来改变粒径，波长和折射率，我们发现，对于特定的场景参数，圆偏振在保持较大光学深度的照明偏振状态时，优于线性偏振。圆极化的这种增强可用于改善在许多关键传感应用中很重要的模糊环境中的距离和目标检测。最初，研究人员通常采用线性偏振主动照明，采用偏振区分方案，以进一步将目标信号与背景噪声区分开。最近，研究人员已经研究了圆极化，以将信号与噪声进一步分离。具体来说，我们对线偏振和圆偏振主动照明进行了量化，并显示了在短波红外中的辐射雾，短波和长波红外中的对流雾以及较大粒径的圆偏振，圆偏振比线性偏振的持久性要好于线性偏振。撒哈拉沙漠尘埃的波长约为4微米。相反，对于长波红外中有限的辐射雾粒径，波长为9-10.5μm的撒哈拉尘埃小粒径以及通过长波红外的波长范围为8-11微米。 （c）2015年美国眼镜学会

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