金属光谱发射率的仿真与分析

 在研究物体的辐射特性时,需要用到物体表面的发射率等物性参数作为输入参数。实验测量发射率数据的适用范围受到一定限制,不能满足所有情况的数值仿真需要。从电磁波传播的基础理论着手,结合金属自由电子气模型,考虑光学参数的色散关系和空气入射到金属内折射角的复数关系,并在随机模拟金属粗糙表面的基础上,模拟并讨论了不同影响因素下实际金属表面的光谱发射率变化趋势。将本文的数值仿真与其他相关的实验和仿真数据进行对比,结果表明,该方法从本质理解并计算金属实际表面光谱发射率数值,结果可信,并具有普遍适应性。

Simulation and Analysis of Spectral Emissivity of Metals

The study of the radiation characteristics of an object requires several physical property parameters of the object, including its emissivity. Test data are usually limited by test circumstances and can not meet the requirements for emissivity numeric simulation. This article creates an academic computational method. First, it explores the theory of electromagnetic waves transmitting in metals combined with a free-electron model of metals. Then it discusses the dispersive relation of optical constants and the complex refractivity in the light incidencing from air to metal, and performs a random simulation of a rough metal surface. Furthermore, it discusses the various factors which affect the regular law of metal spectral emissivity. Compared with similar tests and numeric data, this method for computation of any kind of metal emissivity is credible and widely applicable.