一种提高红外透射光学系统热分析精度的方法  

Method for Enhancing Thermal Control Precision of Infrared Transmission Optical System

作　　者：刘伏龙[1] 李春林[1] 赵宇[1] 

机构地区：[1]北京空间机电研究所,北京100094

出　　处：《航天返回与遥感》2015年第1期57-63,共7页Spacecraft Recovery & Remote Sensing

摘　　要：工程计算中通常将常温物体在红外谱段的辐射简化为灰体辐射,即物体的单色吸收比与波长无关。针对谱段选择性较强的红外透射式光学系统,这一假设会对热分析精度造成一定影响,甚至可能影响最终的成像品质。文章提出一种红外透镜材料光学辐射特性的等效计算方法,考虑材料对不同波长辐射选择性的吸收、反射与透过,并根据在轨地球红外辐射、地球反射太阳辐射、载荷内环境辐射特性,等效出用于热分析计算的透镜红外吸收比、反射比与透过比。应用该方法通过IDEAS-TMG软件对某空间红外载荷进行仿真验证,精确计算出红外透镜温度。The infrared radiation of an object at normal temperature is usually simplified as a gray body radiation in engineering calculation, which means that the monochromatic absorptivity of the object is irrelevant to wavelength. For an infrared transmission optical system with higher spectrum selective, this hypothesis leads to some influences on precision of thermal analysis, even on the final imaging quality. This paper presents an equivalent calculation method for optical property of infrared optical lens. The infrared absorptivity, reflectivity and transmission of optical lens are figured out based on absorption, reflection and transmission of material for radiation selectivity at different wavelengthes as well as in consideration of the properties of infrared radiation of the Earth, ground reflection and environmental radiation inside payloads. The temperature of infrared optical lens is calculated precisely through simulation verification with IDEAS-TMG software applied to infrared payload of a space.

关 键 词：红外透射式光学系统 光谱辐射特性 等效计算 热分析 空间遥感 

分 类 号：V443.5[航空宇航科学与技术—飞行器设计]