水中气泡上的体散射函数的模拟与计算

基于几何光学的基本原理,推导出一种可以计算水中大尺度气泡上光散射角度与强度的关系式。推导中避免引入衰减因子G,较Davis模型更为简单。该模型可应用于光在水中单个气泡上散射的数值计算。最后,模拟计算了平行光束入射水中气泡的体散射函数曲线,发现水中气泡的前向散射远大于后向散射;当气泡半径在远大于光波波长的前提下变化时,气泡上散射光强分布规律与气泡半径无关;而介质相对折射率的增大会削弱前向散射而增强后向散射光强。

Simulation and Computation of Bubbles Volume Scattering Function in Water

An equation for calculating relation of the incident angle and the scattering intensity from a large scale air bubble in water is derived based on the principle of geometrical optics.By neglecting the attenuation factor G,the formula is much simpler than the Davis model.One application of the model is to calculate the angular distribution of the scattering light by a single air bubble.The volume scattering function is simulated with the collimated light incident on the air bubble.It is found that the forward scattering is far greater than the backward scattering.As long as the bubble radius is much larger than the wavelength of light,the angular distribution of the scattering light is not influenced by the change of bubble radius.However,the increase of relative refraction index weakens the forward scattering while strengthens the backward scattering on the bubble surface.