一维随机粗糙表面散射特征的数值分析

Numerical Analysis of Scattering from 1 Dimensional Random Rough Surfaces

本文在Ｋｉｒｃｈｈｏｆ近似基础上，利用数值积分方法分析了一维随机粗糙表面的散射特征。结果显示随着粗糙度的增大，单次散射峰值由镜向连续地向后向移动，其强度不断降低，峰值宽度增加。在一个较窄的粗糙度范围内，散射场对称于表面法线呈近似余弦分布而接近于理想朗伯体。当粗糙度超过这一范围时，散射峰值将由法线向后向移动，并在粗糙度很大时稳定在后向附近。

Scattering from 1 dimensional random rough surfaces with varying roughness was investigated by numerical integration based on Kirchhoff approximation.With the increase of roughness,scattering peak was shown to shift continuously from specular to backscattering direction,while its amplitude decreased and width broadened.The surface exhibited a nearly cosine scattering distribution within a narrow range of roughness and could be treated as a Lambertian body.Scattering peaks will remain at backscattering direction when the roughness is very large.