光学学报, 2016, 36 (10): 1026014, 网络出版: 2016-10-12   

海洋湍流中光学成像相关问题研究 下载: 521次

Problems of Optical Imaging in Oceanic Turbulence
作者单位
四川师范大学物理系, 四川 成都 610101
摘要
比较研究了海洋湍流与大气湍流中长曝光调制传递函数的差异,讨论了海洋湍流中短曝光调制传递函数(SEMTF)的适用性,并且详细研究了海洋湍流参数对系统分辨率的影响。研究表明:海洋湍流中温度起伏占主导地位比盐度起伏占主导地位时的成像质量更高, 即包含更多原图像的高频细节。虽然用Fried短曝光理论研究SEMTF时在高频区存在缺陷,但随着透镜直径与空间相干长度之比以及光传输距离的增大,SEMTF在高频区的适用性增强。此外,随着海水功率谱温度与盐度的比率和海水温度方差耗散率的增大,海水单位质量湍流动能耗散率的减小,海洋湍流中光学系统的分辨率减小, 即成像质量变差。
Abstract
Difference of the modulation transfer function for long-exposure imaging between the oceanic turbulence and the atmospheric turbulence is compared. Applicability of the modulation transfer function for short-exposure imaging (SEMTF) in the oceanic turbulence is discussed. Moreover, effects of the oceanic turbulence parameters on the system resolution are studied in detail. Results show that the quality of imaging is better in the dominating temperature-induced turbulence than that in the dominating salinity-induced turbulence, i.e., the image contains more high-frequency components of the original image. The SEMTF study based on the Fried short-exposure theory is defective in the high-frequency region, but the applicability of SEMTF can be enhanced as the ratio of lens diameter to the spatial coherence radius and the path length increase. In addition, the resolution of imaging decreases, i.e., the quality of imaging is degraded, as the ratio of temperature and salinity of the seawater power spectrum increases, the dissipation rate of the seawater temperature variance increases, and the dissipation rate of the seawater unit mass turbulence kinetic energy decreases.

蒲欢, 季小玲. 海洋湍流中光学成像相关问题研究[J]. 光学学报, 2016, 36(10): 1026014. Pu Huan, Ji Xiaoling. Problems of Optical Imaging in Oceanic Turbulence[J]. Acta Optica Sinica, 2016, 36(10): 1026014.

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