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星载遥感器的挡光环优化设计与分析 总被引:1,自引:0,他引:1
空间光学系统的工作环境非常恶劣, 特别是在卫星本地时间的白天。太空中的太阳光、地气光以及各种热辐射构成了严重的背景噪声, 威胁着空间光学系统的成像质量, 甚至导致空间光学系统因无法成像而失去探测能力。挡光环的出现大大改善了背景噪声带来的不良影响, 可以直接阻挡视场外杂光, 从而影响着系统的杂光抑制能力。然而, 由于挡光环的尺寸较小, 当光线入射到挡光环的边缘时就会产生严重的衍射效应, 这种衍射效应对改善表面材料的散射特性起了反作用。因此, 怎样设计结构合理的挡光环成为了遮光罩设计中的重要环节。本文将机械设计中的聚焦组合创新方法应用到空间光学系统的挡光环优化设计中, 提出了新型结构的挡光环。通过与已有挡光环的结构形式做比较, 经计算机仿真, 验证了该新型结构挡光环的抑制杂散光的优越性, 为我国星载遥感器的挡光环设计提供一种新的方法。 相似文献
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<正>Stray light analysis of a three-mirror spatial optical system is presented.The entrance pupil diameter (EPD) of the system is 320 mm,the effective focal length(EFL) is 2809 mm,and the field of view(FOV) is 1°×0.5°.Its walls are coated with extinction paint(the absorption coefficient of which is 97%).The point source transmittance(PST) of the system is thus reduced by up to two orders of magnitude.Moreover, this technique makes it feasible to block the stray light coming from outside of the FOV by increasing the outer baffle length of the system.Adding an inner baffle to both the primary and the secondary mirrors helps not only to block the stray light coming from outside of the FOV but also to decrease the length of the outer baffle.Simulation results show that the PST values are less than 10~(-10) when the off-axis angle is larger than 9°.The stray light is also suppressed effectively by placing a glare stop at the first imaging plane of Cassegrain telescope.It is surprising that the PST value is 10~(-14) when the off-axis angle is 2°with the placement of glare stop at the first image plane. 相似文献
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This paper analyses the dynamic residual aberrations of a
conformal optical system and introduces adaptive optics (AO)
correction technology to this system. The image sharpening AO system
is chosen as the correction scheme. Communication between MATLAB and
Code V is established via ActiveX technique in computer simulation.
The SPGD algorithm is operated at seven zoom positions to
calculate the optimized surface shape of the deformable mirror.
After comparison of performance of the corrected system with the
baseline system, AO technology is proved to be a good way of
correcting the dynamic residual aberration in conformal optical
design. 相似文献
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