将伪光源迭加法与光线分裂跟踪算法相结合,通过模拟计算介质的内部发射和辐射传递,研究了梯度折射率(GRIN)半透明介质层的表观发射特性.考虑折射率为线性分布的情况,计算分析了等温情况下不同参数介质层的表观方向发射率和半球发射率,并比较分析了离散层数对计算结果的影响.

By simulating the inside thermal emission of the medium and the radiation transfer process, the apparent emitting characteristics of a semi transparent medium layer with graded index (GRIN) was investigated. The pseudo source adding method was combined with the ray splitting and tracing technique in simulation.When constant and linearly distributed refractive indexes were considered for an isothermal layer, the apparent directional and hemispherical emissivities were both presented and analyzed for different parameters. In addition, the influence of the discrete sub layer number on the calculating was discussed. The results show that the graded refractive index may considerably affect the apparent emission of a semi transparent medium layer.