大气与环境光学学报, 2008, 3 (1): 0065, 网络出版: 2010-05-21
海洋悬浮粒子的光学后向散射率特性研究
Study on Backward Scattering Ratio Characteristics of Oceanic Suspended Particles
海洋光学 后向散射率 散射相函数 米氏散射 oceanic optics backward scattering ratio scattering phase function Mie scattering
摘要
后向散射率不仅是机载激光雷达探测海水后向散射信号的重要参量,也是海洋悬浮粒子重要的光学特性,根据米氏散射理论及其散射相函数计算公式,推导出了海洋悬浮粒子后向散射率的计算公式。通过对海水中的藻类粒子和悬浮泥沙颗粒散射相函数的分析,获取这两类主要海洋悬浮粒子各自的后向散射率,并进一步分析了后向散射率与粒子半径和波长的关系。仿真计算结果表明,当探测波长一定时,藻类粒子的后向散射率随粒子半径的增大而增大,而悬浮泥沙颗粒的后向散射率随粒子半径的增大而减小;当粒子半径一定时,藻类粒子和悬浮泥沙颗粒的后向散射率均随探测波长的增大而增大。
Abstract
The backward scattering ratio is not only an important parameter of detecting seawater backward scattering signal based on airborne lidar, but also a very important optical property of oceanic suspended particles. Based on Mie scattering theory and scattering phase function, it puts forward a formula to calculate the backward scattering ratio. According to Mie scattering theory, the scattering phase function characteristics of alga particles and suspended sands are analyzed, and their backward scattering ratios are obtained too. In addition, the relationship between backward scattering ratio and particle radius and lidar wavelength is discussed in detail. From the simulation results, it can be found that, in the condition of the constant lidar wavelength, the backward scattering ratio of the alga particle increases with the increase of alga particle radius, while the backward scattering ratio of the suspended sand decreases with the increase of suspended sand radius. At the same time, in the condition of the constant particle radius, the two main suspended particles' backward scattering ratios increase with the increase of the lidar wavelength.
林宏, 董天临, 马泳, 艾青. 海洋悬浮粒子的光学后向散射率特性研究[J]. 大气与环境光学学报, 2008, 3(1): 0065. LIN Hong, DONG Tian-lin, MA Yong, AI Qing. Study on Backward Scattering Ratio Characteristics of Oceanic Suspended Particles[J]. Journal of Atmospheric and Environmental Optics, 2008, 3(1): 0065.