光在水中吸附膜层气泡上的散射特性

光在水中大尺度气泡上散射特性的研究多是基于Davis模型.该模型没有考虑到吸附膜层对光在气泡上散射的影响,而海水中的大多数气泡都有膜层附着,这些膜层会影响到气泡的光散射特性.本文从几何光学的角度出发,建立了吸附膜层气泡的体积散射函数简化公式.在此理论基础上,模拟计算了尺度远大于入射光波长的大气泡散射光强分布曲线,得出光照射下气泡上散射光强的远场特性,讨论了影响气泡散射光强分布的主要因素.并与无膜气泡光散射分布曲线比较,讨论了油膜膜厚、折射率等参量对气泡的光散射特性影响.得出结论:吸附膜层气泡的光强分布曲线与无膜气泡相似,但吸附膜层会削弱前向散射光,增强后向散射光.

Distribution Characteristics of Scattered Light Intensity on Coated Air Bubble in Water

Most of the former studies on characteristics of scattered light on large bubbles in water are based on Davis model, in which a bubble is regarded as an uncoated spherical object. However, most of the bubbles in water are coated with oil layer, which surely influences their scattering characteristics. We establish a simplified equation to calculate how a light beam is scattered when it enters a coated bubble. A two-dimensional curve,namely volume scattering function (VSF) is plotted, that models the angular distribution of scattered intensity by a coated bubble with a diameter far larger than wavelength of incident light. The curve reveals the far-field characteristics of light scattered by the coated bubble, as well as the main influence on scattering intensity. By comparing with VSF of uncoated bubble, we discuss the parameters that influence distribution of scattering light on a coated bubble, such as thickness of the oil layer, relative index of refraction and get that oil coating weakens the forward scattering of the coated bubble while strengthens the backward scattering.