冷屏黑层抑制杂散辐射分析研究

Analysis and study of suppressing stray radiation using black coating of cold shield

通过对冷屏抑制杂散辐射原理的分析,得出测量冷屏内表面的反射是研究工作的切入点,从而从基本能量传递方程中确定表征冷屏内表面黑层特性的BRDF。通过对2.5～14μm冷屏黑层BRDF的测试,发现在接收角度变小的情况下,黑层BRDF出现较大的变化,确定了下一步改进的方向。

The principle of suppressing stray radiation with cold shield is analyzed, it is found that the internal surface reflection measurement of cold shield is the key point. BRDF can be obtained from the energy transfer equation, it can characterize the physical property of cold shield black coating. Through BRDF measurement of 2. 5 - 14μm cold shield black coating, it is found that the variation of BRDF is bigger when reflection angle gets smaller.