The detection of objects in a turbid underwater medium using orbital angular momentum (OAM)
The detection of objects in a turbid underwater medium using orbital angular momentum (OAM)
复制标题
使用轨道角动量 (OAM) 检测浑浊水下介质中的物体
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
E. Johnson
中科院分区：
文献类型：
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作者：
B. Cochenour;L. Rodgers;A. Laux;L. Mullen;K. Morgan;Jerome K. Miller;E. Johnson
本文研究了轨道角动量（OAM）的光学特性，并将其应用于水下浑浊信道中目标的探测。在我们的实验中，目标被高斯光束照射。通过使物体反射和后向散射的光穿过接收器处的衍射螺旋相位板形成光学涡旋，这允许相干光和非相干光的空间分离。这提供了一种从环境中区分目标的方法。初步的实验结果表明，弹道目标回波可以检测到2-3个数量级以下的后向散射杂波电平。此外，该相干分量的检测是通过使用复杂的光学外差方案来完成的。这些结果为水下成像或激光雷达提供了新的光学传感技术。
We present an investigation of the optical property of orbital angular momentum (OAM) for use in the detection of objects obscured by a turbid underwater channel. In our experiment, a target is illuminated by a Gaussian beam. An optical vortex is formed by passing the object-reflected and backscattered light through a diffractive spiral phase plate at the receiver, which allows for the spatial separation of coherent and non-coherent light. This provides a method for discriminating target from environment. Initial laboratory results show that the ballistic target return can be detected 2-3 orders of magnitude below the backscatter clutter level. Furthermore, the detection of this coherent component is accomplished with the use of a complicated optical heterodyning scheme. The results suggest new optical sensing techniques for underwater imaging or LIDAR.