不同粗糙度表面双向反射分布函数的实验研究

为了研究目标表面的激光散射特性,利用双向反射分布函数的方法,采用自行设计的双向反射分布函数测量装置对样品表面双向反射分布函数进行了实验测量研究。以BaSO4粉压制板作为漫反射标准板,通过样本比值法进行对比研究,得到了样品在不同粗糙度和不同入射角下反射光的空间分布。结果表明,粗糙度越小,样品表面镜像反射的双向反射分布函数峰值就越大,镜反射现象越明显;入射角度越小,样品表面镜像反射的双向反射分布函数峰值就越小,呈现出一定的漫反射特征;反之亦然。反映出不同粗糙度表面对激光散射程度不同。

Experimental research of Bidirectional Reflectance Distribution Functions of target surfaces with different roughness

Bidirectional reflectance distribution function(BRDF) can be used to study the laser scattering properties of target surface.A setup for the measurement of scattering characteristics of the sample's BRDF was designed in the laboratory.The powder pressboard of BaSO4 was used as the standard reflection board.The spatial distribution of reflected light intensity was obtained at different roughness and incident angles. The sample's BRDF at space was obtained. The results indicate that the lower the roughness of the surface plate, the larger the BRDF in the mirror direction; the larger the incident angle, the larger the BRDF in the mirror direction;tacertain degree of diffusive reflection characteristics appears; and vice versa. Different surface roughness determines corresponding different degrees of laser scattering.