Imaging through extreme scattering in extended dynamic media
Imaging through extreme scattering in extended dynamic media
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DOI：
10.1364/ol.43.003088
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发表时间：
2018-07-01
期刊：
影响因子：
3.6
通讯作者：
Lindle, J. R.
中科院分区：
文献类型：
--
作者：
Kanaev, A., V;Watnik, A. T.;Lindle, J. R.
对于导航、态势感知和物体识别来说，关键是能够透过浑浊的水和雾成像。迄今为止，在这种环境中最长的成像距离依赖于主动照明和通过时间选通选择弹道光子。在这里，我们表明，成像范围可以通过使用时间选通全息术与多帧处理相结合来扩展。我们不是简单地将帧的强度相加，而是使用通过数字全息处理检索的复杂场，并将帧相干相加。我们演示了通过扩展机构的混浊的水和雾在单向衰减长度分别为13和13.6，成像。与同等的传统时间选通系统相比，对于相同的成像范围，选通全息和相干处理需要的激光照明功率减少20倍。
Critical to navigation, situational awareness, and object identification is the ability to image through turbid water and fog. To date, the longest imaging ranges in such environments rely on active illumination and selection of ballistic photons by means of time gating. Here we show that the imaging range can be extended by using time-gated holography in combination with multi-frame processing. Instead of simply summing the intensity of the frames, we use the complex fields retrieved through digital holographic processing and coherently add the frames. We demonstrate imaging through extended bodies of turbid water and fog at one-way attenuation lengths of 13 and 13.6, respectively. Compared to equivalent traditional time-gated systems, gated holography and coherent processing require 20x less laser illumination power for the same imaging range.