摘要
文章针对透射式光学系统进行了热仿真分析,比较了不同太阳吸收率、透过率、反射率下各透镜的温度及太阳外热流情况。结果表明,太阳辐射参数的给定对高轨透射系统温度仿真计算结果的影响很大,需要准确给定;某些谱段的太阳能量被透镜选择性吸收和反射,下层透镜使用全谱段的太阳辐射参数来计算温度将不再准确。针对上述问题,文章提出了一种新的透镜等效太阳辐射参数的计算方法,该方法将太阳光谱能量分布近似为5 800 K黑体辐射能量分布,采用普朗克公式对经过透镜的各部分能量进行计算,进而等效出各太阳辐射参数,有效提高了仿真分析的准确性。最后以某空间相机透射系统为例进行了分析计算,对该方法进行了验证。
In this paper, thermal simulation analysis of space camera optical lens is accomplished. The temperatures and solar heat flux of optical lens with different solar absorptivity, transmissivity and reflectivity are compared. The results indicate that the solar radiation parameters have important influence on the tempera- ture of optical lens. On the other hand, using the solar radiation parameters of whole spectrum to calculate the temperatures of nether optical lens results in inaccurate simulation calculation because the energy of some spectrum are reflected or absorbed by foregoing optical lens. In allusion to the conundrum, a new calculation method of radiation parameters is introduced in this paper. The spectrum distribution of solar energy is re- garded as spectrum distribution of 5800K blackbody approximately and the equivalent solar radiation parame- ters could be calculated by using Planck formula. By using this method, the precision of simulation analysis can be improved which is validated by optical lens fitted on some space camera.
出处
《航天返回与遥感》
2013年第2期36-41,共6页
Spacecraft Recovery & Remote Sensing
