空间光学系统的红外杂散辐射抑制特性

Suppression of Infrared Stray Radiation in Space Optical System

空间光学系统自身的红外波段杂散辐射,是影响探测元面成像质量的一个重要因素。文章分析了导致探测元面上红外辐射能变化的相关因素。以柱状遮光筒为计算模型,引入了红外杂散辐射传递函数IRTF这一无量纲参数来表征、分析柱状遮光筒的红外杂散辐射抑制特性。采用蒙特卡罗法模拟遮光筒中红外波段杂散辐射传递过程,分析了长径比χ、壁面红外发射率εw、壁面相对黑体辐射参数γw对遮光筒IRTF的影响;讨论了遮光筒抑制能力对入射杂散辐射方向的选择性。

Infrared stray radiation, coming from the space optical system, is one of the main elements that affect the quality of figure on the detector. This paper analyzed the reference factors, which could change the energy of infrared radiation on the detector. Cylindrical shield was selected as a computation model, and then IRTF was employed to indicate and analyze the suppression characters of infrared stray radiation for this structure. The process of the transmission for infrared stray radiation through the shield has been simulated by Monte Carlo method. The ratio between lengths and diameter X, infrared emissivity εw, the radiative parameter comparing to black body γw were attributed to IRTE Finally, the alternative of direction for infrared stray radiation to the shield＇s suppression character was discussed.