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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, the thermal simulation of transmission optical system is carried out. The temperature and solar heat flux of different lenses under different solar absorptance, transmittance and reflectance are compared. The results show that the given solar radiation parameters have a great influence on the temperature simulation results of the high-altitude transmission system and need to be accurately given. The solar energy of some spectral bands is selectively absorbed and reflected by the lens, Solar radiation parameters to calculate the temperature will no longer be accurate. In order to solve the above problems, a new calculation method of lens equivalent solar radiation parameters is proposed. The energy distribution of the solar spectrum is approximated as 5 800 K black body radiation energy distribution. Planck’s formula is used to calculate the energy of each part of the lens Calculated, and then equivalent to the solar radiation parameters, effectively improve the accuracy of simulation analysis. Finally, taking a space camera transmission system as an example, this paper analyzes and calculates the method.