光学学报, 2016, 36 (8): 0801002, 网络出版: 2016-08-18   

湍流环境中水下成像系统的调制传递函数研究

Research of Modulation Transfer Function of Underwater Imaging System in Turbulent Environment
作者单位
华中科技大学光学与电子信息学院, 湖北 武汉 430074
摘要
为了研究湍流对水下成像系统的影响,搭建了一套光学成像实验系统,利用水泵和水槽制造流速可控的湍流实验区域,使用CCD对正弦条纹目标成像,并分析图像质量。通过对实验环境的控制,得到不同浑浊度和不同流速下的成像结果,并提取调制传递函数(MTF)对结果进行分析。结果表明,悬浮颗粒散射在整个空间频率上造成调制对比度下降;而湍流散射更容易造成高空间频率域的MTF下降;随着进水口处流速的增加以及水体衰减系数的增大,其MTF曲线加快衰减;在湍流环境下的成像,图像失真和分辨率下降由颗粒散射和湍流散射共同造成。
Abstract
In order to study the effect of turbulence on submarine imaging system, an optical experiment system is built using pump and tank to make the turbulence area with controllable water flow velocity. The CCD is used to imaging the sinusoidal fringe and the image quality is analyzed. The imaging results with various water turbidity and flow velocity are obtained through the control of imaging experiment environment. The modulation transfer function (MTF) is extracted to analyze the results. Experimental results show that the particle scattering causes modulation contrast declines in the whole spatial frequency. The effect caused by turbulence scattering is more obvious on the high frequency. With the increase of inlet flow velocity and the attenuation coefficient, the MTF curves show quick downward trends. The image distortion and decline of resolution are caused by the particle and turbulence scattering in the turbulent environment.
参考文献

[1] Zhu X M, Kahn J M. Free-space optical communication through atmospheric turbulence channels[J]. IEEE Transactions on Communications, 2002, 50(8): 1293-1300.

[2] Stephen B. Turbulent Flows[M]. Cambridge: Cambridge University Press, 2000.

[3] Prandke H, Stips A. Microstructure profiler to study mixing and turbulent transport processes[C]. Oceans '98 Conference Proceedings, 1998(1): 179-183.

[4] Osborn T R. Vertical profiling of velocity microstructure[J]. Journal of Physical Oceanography, 1974, 4(1): 109-115.

[5] 魏皓, 武建平, 张平. 海洋湍流模式应用研究[J]. 青岛海洋大学学报(自然科学版), 2001, 31(1): 7-13.

    Wei Hao, Wu Jianping, Zhang Ping. Application research on ocean turbulence model[J]. Journal of Ocean University of Qingdao, 2001, 31(1): 7-13.

[6] Goodman L, Levine E R, Lueck R G. On measuring the terms of the turbulent kinetic energy budget from an AUV[J]. Journal of Atmospheric and Oceanic Technology, 2006, 23(7): 977-990.

[7] Kocsis O, Prandke H, Stips A. Comparison of dissipation of turbulent kinetic energy determined from shear and temperature microstructure[J]. Journal of Marine Systems, 1999, 21(1): 67-84.

[8] 魏传杰, 于非, 郭景松, 等. 黄海西部海洋湍流的季节变化特征分析[J]. 海洋与湖沼, 2014, 45(1): 166-171.

    Wei Chuanjie, Yu Fei, Guo Jingsong, et al. Analysis of characteristics of ocean turbulence of seasonal change in the western Huanghai Sea[J]. Oceanologia et Limnologia Sinica, 2014, 45(1): 166-171.

[9] Burchard H. Applied turbulence modelling in marine waters[M]. Berlin: Springer, 2002.

[10] Thorpe S A. The turbulent ocean[M]. Cambridge: Cambridge University Press, 2007.

[11] 吴琳, 房建成, 杨照华. 高超声速湍流流场高折射率梯度区域气动光学畸变仿真研究[J]. 光学学报, 2009, 29(11): 2952-2957.

    Wu lin, Fang Jiancheng, Yang Zhaohua. Study on aero-optical distortion simulation of high refraction index gradient regions in hypersonic turbulent flow[J], Acta Optica Sinica, 2009, 29(11): 2952-2957.

[12] 钱仙妹, 朱文越, 饶瑞中. 非均匀湍流路径光传播数值模拟中相位屏间C2n的选取[J]. 光学学报, 2008, 28(10): 1856-1860.

    Qian Xianmei, Zhu Wenyue, Rao Ruizhong. Selection of C2n between phase screens for simulating laser propagation along an inhomogeneous turbulent path[J]. Acta Optica Sinica, 2008, 28(10): 1856-1860.

[13] 罗曦, 李新阳. 随机并行梯度下降算法拟合大气湍流廓线统计模式的研究[J]. 光学学报, 2012, 32(9): 0901003.

    Luo Xi, Li Xinyang. Investigation on atmospheric optical turbulence profile statistical mode by stochastic parallel gradient descent algorithm[J]. Acta Optica Sinica, 2012, 32(9): 0901003.

[14] 张彩云, 翁宁泉, 高慧, 等. 基于风廓线雷达的光波段折射率结构常数方法研究与理论仿真[J]. 光学学报, 2013, 33(3): 0301004.

    Zhang Caiyun, Weng Ningquan, Gao Hui, et al. Research and theoretical simulation on the optical wave refractive index structure constant using wind profile radar[J]. Acta Optica Sinica, 2013, 33(3): 0301004.

[15] Hou W L, Woods S, Jarosz E, et al. Optical turbulence on underwater image degradation in natural environments[J]. Applied Optics, 2012, 51(14): 2678-2686.

[16] 张兆顺, 崔桂香, 许春晓. 湍流理论与模拟[M]. 北京: 清华大学出版社, 2005.

    Zhang Zhaoshun, Cui Guixiang, Xu Chunxiao. Turbulence theory and simulation[M]. Beijing: Tsinghua University Press, 2005.

[17] Hou W L. A simple underwater imaging model[J]. Optics Letters, 2009, 34(17): 2688-2690.

孙立颖, 夏珉, 韩捷飞, 杨克成. 湍流环境中水下成像系统的调制传递函数研究[J]. 光学学报, 2016, 36(8): 0801002. Sun Liying, Xia Min, Han Jiefei, Yang Kecheng. Research of Modulation Transfer Function of Underwater Imaging System in Turbulent Environment[J]. Acta Optica Sinica, 2016, 36(8): 0801002.

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