Retrieval of short ocean wave slope using polarimetric imaging
Retrieval of short ocean wave slope using polarimetric imaging
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DOI：
10.1088/0957-0233/19/5/055503
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发表时间：
2008-05
影响因子：
2.4
通讯作者：
C. Zappa;M. Banner;H. Schultz;A. Corrada-Emmanuel;L. B. Wolff;Jacob I. Yalcin
中科院分区：
文献类型：
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作者：
C. Zappa;M. Banner;H. Schultz;A. Corrada-Emmanuel;L. B. Wolff;Jacob I. Yalcin
我们提出了一种被动光学遥感技术恢复水面的形状信息，在一个二维的斜坡地图的形式。该方法被称为偏振斜率传感（PSS），使用表面取向和反射光的偏振变化之间的关系来推断成像偏振计视场内的瞬时二维斜率。对于非偏振天空光，反射天空光的偏振方向和线偏振度提供了足够的信息来确定局部表面斜率矢量。在波浪水槽中进行了机械重力波的受控实验。第二项研究是在拉蒙特-多尔蒂地球观测站附近的哈德逊河上的一个码头进行的。我们证明，可以准确地恢复短重力波的二维斜率场，而不干扰空气或水的流体动力学，水面特征显得非常逼真。结合现场和实验室的结果表明，偏振相机提供了一个强大的表征风驱动的空气-海洋相互作用过程中固有的细尺度表面波功能。
We present a passive optical remote sensing technique for recovering shape information about a water surface, in the form of a two-dimensional slope map. The method, known as polarimetric slope sensing (PSS), uses the relationship between surface orientation and the change in polarization of reflected light to infer the instantaneous two-dimensional slope across the field-of-view of an imaging polarimeter. For unpolarized skylight, the polarization orientation and degree of linear polarization of the reflected skylight provide sufficient information to determine the local surface slope vectors. A controlled laboratory experiment was carried out in a wave tank with mechanically generated gravity waves. A second study was performed from a pier on the Hudson River, near Lamont-Doherty Earth Observatory. We demonstrated that the two-dimensional slope field of short gravity waves could be recovered accurately without interfering with the fluid dynamics of the air or water, and water surface features appear remarkably realistic. The combined field and laboratory results demonstrate that the polarimetric camera gives a robust characterization of the fine-scale surface wave features that are intrinsic to wind-driven air–sea interaction processes.