Fade Julien, Panigrahi Swapnesh, Carré Anthony, Frein Ludovic, Hamel Cyril, Bretenaker Fabien, Ramachandran Hema, Alouini Mehdi
Appl Opt. 2014 Jun 20;53(18):3854-65. doi: 10.1364/AO.53.003854.
We report an experimental implementation of long-range polarimetric imaging through fog over kilometric distance in real field atmospheric conditions. An incoherent polarized light source settled on a telecommunication tower is imaged at a distance of 1.3 km with a snapshot polarimetric camera including a birefringent Wollaston prism, allowing simultaneous acquisition of two images along orthogonal polarization directions. From a large number of acquisitions datasets and under various environmental conditions (clear sky/fog/haze, day/night), we compare the efficiency of using polarized light for source contrast increase with different signal representations (intensity, polarimetric difference, polarimetric contrast, etc.). With the limited-dynamics detector used, a maximum fourfold increase in contrast was demonstrated under bright background illumination using polarimetric difference image.
我们报告了在实际野外大气条件下，通过千米距离的雾进行长距离偏振成像的实验实现。安置在电信塔上的非相干偏振光源，使用包括双折射沃拉斯顿棱镜的快照偏振相机在1.3千米的距离处成像，从而能够同时采集沿正交偏振方向的两幅图像。从大量采集数据集以及在各种环境条件（晴空/雾/霾、白天/夜晚）下，我们比较了使用偏振光以不同信号表示（强度、偏振差异、偏振对比度等）来提高光源对比度的效率。使用有限动态范围的探测器，在明亮背景照明下，通过偏振差异图像证明对比度最大可提高四倍。
