光辐射吸收材料表面形貌与吸收率关系研究

光辐射吸收材料不同的表面形貌对入射光具有不同的多重反射吸收效果,对光辐射的吸收有较大的影响,合适的表面形貌可以提高光辐射有效吸收率.本文通过光线追迹的方法对V形表面、正弦表面、具有正态倾角(平均倾角)分布的表面以及具有正态高度分布的表面进行模拟, 分析了这四种表面对光辐射吸收率的提升效果及其入射角特性.通过倾角分布分析,得出不同表面形貌提升吸收率共同的必要条件,即倾角中心分布至少大于30°,并指出V形表面在正入射时对吸收率提升的优越性.关键词：光吸收材料表面形貌吸收率表面倾角分布

Study on the surface morphology and absorptivity of light-absorbing materials

Different types of surface morphology have different effects on multiple reflection of optical materials for absorbing light and have significant influence on absorptivity of materials. A suitable surface morphology can increase the effective absorptivity of optical materials. In this paper, we simulate the multiple reflection effects of V-shaped surface, Sine-shape surface, normal or uniform obliquity distribution surface and normal height distribution surface with the ray tracing method, and then analyse the capabilities of increasing the absorbtivity and the characteristics of incident angle of light on the four types of surfaces. The common necessary condition for increasing absorbtivity of these surfaces is obtained by obliquity analysis, i.e. the mean obliquity of the surface should be larger than 30 degrees at least, and the advantages of the V-shape surface to increase absorptivity under normal incidence are analysed.