红外与激光工程, 2017, 46 (12): 1204002, 网络出版: 2018-01-19   

红外圆偏振光透雾性能分析

Analysis on fogging performance of infrared circularly polarized light
作者单位
大连理工大学 机械工程学院, 辽宁 大连 116024
摘要
雾对红外系统的探测性能有一定影响,圆偏振光在雾中传输时具有优良的保偏性和持久性, 为解决雾的红外遮蔽问题提供了新思路。分析雾对红外光波的衰减是由吸收和散射共同作用; 阐述了圆偏振光透雾是由圆偏振光波螺旋性的随机化速率缓慢和圆偏振光子在传播方向的随机化速率缓慢共同作用, 致使圆偏振光受雾滴的光散射影响较小; 结合圆偏振透雾机理和大气光谱特征, 探究雾中目标检测的优化波段, 研究表明: 在近红外波段的0.78~1.1 μm、1.48~1.56 μm、1.63~1.86 μm、2.03~2.18 μm、2.39~2.5 μm和中红外波段的3.6~4.15 μm, 适宜采用圆偏振成像技术提高红外系统透雾性能, 长红外波段, 雾滴的光吸收占总消光的比例增大, 已不宜采用圆偏振成像技术来提高红外系统的透雾性能。最后, 分析了红外圆偏振透雾技术的特点, 并对深入研究提出了建议。
Abstract
Sensing in scattering environments, such as fog, poses a serious challenge for infrared systems. Circular polarization is of increasing interest due to its potentially superior persistence in fog. Circular polarization imaging is one of the ways to avoid fog attenuation in infrared waves. Fog attenuation in infrared waves involves complicating interactions of scattering and absorption. The mechanism of circular polarization′s increased persistence was theoretically expounded; it was proposed that circular polarization depolarized slowly due to the randomization of the photon′s direction and the randomization of the helicity. Then, circularly polarized light was less affected by scattering. Optimal detection bands of target detection in fog were selected based on the mechanism of circular polarization′s increased persistence and the atmospheric radiation spectrum. Optimal bands were selected which were 0.78-1.1 μm, 1.48-1.56 μm, 1.63-1.86 μm, 2.03-2.18 μm, 2.39-2.5 μm in the SWIR and 3.6-4.15 μm in the MWIR. However, the circular polarization imaging technique wasn′t conducive to improve the fogging performance in the LWIR due to the optical absorption ratio increased. Finally, the characteristics and the development direction of circularly polarized imaging in complex atmosphere were summarized.

曾祥伟, 褚金奎, 康维东. 红外圆偏振光透雾性能分析[J]. 红外与激光工程, 2017, 46(12): 1204002. Zeng Xiangwei, Chu Jinkui, Kang Weidong. Analysis on fogging performance of infrared circularly polarized light[J]. Infrared and Laser Engineering, 2017, 46(12): 1204002.

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