中国激光, 2017, 44 (11): 1105001, 网络出版: 2017-11-17
海洋湍流中扩展物体漫反射光成像的数值模拟 下载: 925次
Numerical Simulation of Imaging by Diffuse Reflection Light from Extended Objects in Oceanic Turbulence
海洋光学 湍流介质中成像 海洋湍流 漫反射 扩展物体 数值模拟 oceanic optics imaging through turbulent media oceanic turbulence diffuse reflection extended object numerical simulation
摘要
采用空域滤波方法和海洋湍流功率谱, 编制了海洋湍流中扩展物体漫反射光成像的模拟仿真程序, 研究了成像质量与海洋湍流参数和接收孔径之间的关系。研究发现, 随着海水湍流功率谱中由温度引起的海水折射率变化与由盐度变化引起的海水折射率变化的比率的增大, 海水温度方差耗散率的增大, 以及单位质量海水动能耗散率的减小, 海洋湍流的可见参数减小, 成像质量变差。该数值模拟方法为研究海洋湍流中扩展物体的漫反射光成像提供了一种可行、正确的方法。
Abstract
By using the spatial filtering method and the oceanic turbulence power spectra, the numerical simulation program of imaging by diffuse reflection light from extended objects in oceanic turbulence is designed. The dependence of the imaging quality on the oceanic turbulence parameters and the receiver size is studied. It is found that, with the increases of the ratio of seawater refractive index change caused by temperature to that caused by salinity in the oceanic turbulence power spectra and the dissipation rate of seawater temperature variance, and with the decrease of the dissipation rate of kinetic energy per unit fluid mass, the seeing parameter in oceanic turbulence decreases and the imaging quality degrades. The proposed numerical simulation method provides a feasible and correct approach for the study of imaging by diffuse reflection light from extended objects in oceanic turbulence.
罗燏娟, 季小玲, 李晓庆. 海洋湍流中扩展物体漫反射光成像的数值模拟[J]. 中国激光, 2017, 44(11): 1105001. Luo Yujuan, Ji Xiaoling, Li Xiaoqing. Numerical Simulation of Imaging by Diffuse Reflection Light from Extended Objects in Oceanic Turbulence[J]. Chinese Journal of Lasers, 2017, 44(11): 1105001.