Oceanic turbulence effects on long-exposure and short-exposure imaging

Oceanic turbulence effects on long-exposure and short-exposure imaging
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海洋湍流对长曝光和短曝光成像的影响

DOI:
10.1088/2040-8978/18/10/105704
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发表时间:
2016-09
期刊:
影响因子:
2.1
通讯作者:
Ji Xiaoling
Ji Xiaoling
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
Pu Huan;Ji Xiaoling

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基于海洋湍流的功率谱,详细研究了长曝光和短曝光海洋湍流成像的调制传递函数和光学分辨率。推导了海洋湍流视宁度参数和倾斜方差的解析表达式,发现海洋湍流视宁度参数与空间相干宽度的关系与大气湍流相似。此外,本文所示的水下成像模型考虑了海洋湍流的温度和盐度波动。结果发现,与占主导地位的盐度引起的湍流相比,角空间频率的范围海洋湍流起主要作用,而不是粒子散射是占主导地位的温度引起的湍流更高。
Based on the power spectrum of oceanic turbulence, the modulation transfer functions and the optical resolution for long-exposure and short-exposure imaging through oceanic turbulence are studied in detail. The analytical formulae for the seeing parameter and the tilt variance in oceanic turbulence are derived, and it is found that the relationship between the seeing parameter and the spatial coherence width in oceanic turbulence is just like that in atmospheric turbulence. Furthermore, the model of underwater imaging shown in this paper considers both temperature and salinity fluctuations for oceanic turbulence. It is found that, compared with the dominating salinity-induced turbulence, the range of angular spatial frequency where oceanic turbulence plays the major role rather than particle scattering is higher for the dominating temperature-induced turbulence.
DOI: 10.1088/2040-8978/17/8/085610
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