偏振反射是伴随目标双向反射产生的。为了确定无烟煤表面的偏振反射与双向反射之间的定量关系，对无烟煤表 面进行了多角度偏振反射测量，并利用偏振度对偏振反射与双向反射进行了分析。研究结果表明，光线入射天顶角对偏振度的影响受粗糙 程度与碳含量的控制；随着光线入射天顶角的增大，偏振度会在0°～60°范围内增加；随着无烟煤中碳含量的增加，偏振度也会变 大；表面光滑的无烟煤的偏振度大于表面粗糙的无烟煤的偏振度；偏振度可以定量地将反射光中的镜面反射与漫反射分量的比例关系反映出来。 通过计算偏振度可以反映出无烟煤自身的性质，也可以更详细地将偏振反射与双向反射之间的关系定量化。

The polarized reflection light from a target is accompanied by its bi-directional reflection light. To determine the quantitative relation between the polarized reflectance and the bi-directional reflectance on the surface of anthracite, the polarized reflectance on the surface of anthracite is measured at multi-angles and the polarized reflectance and bi-directional reflectance are analyzed according to the degree of polarization. The result shows that the influence of an incident angle on the degree of polarization is determined by the surface roughness and carbon content of anthracite. With the increase of the incident angle, the degree of polarization can be increased in the range of 0°～60°. With the increase of carbon content, the degree of polarization can be increased too. The degree of polarization of the anthracite with a smooth surface is greater than that of the anthracite with a rough surface. The degree of polarization can indicate the proportional relation between the specular reflection component and the diffuse-reflection component in the reflected light. The calculated degree of polarization can show the inherent nature of anthracite and quantify the relation between the polarized reflectance and the bi-directional reflectance more minutely.