论文部分内容阅读
为了在不影响杂散光抑制效果的同时减少空间遥感器的结构尺寸,方便其姿态控制,提出了一种超短型内嵌式遮光罩。介绍了超短型内嵌式遮光罩的基本结构形式及其优化设计方法。重新设计了遮光罩的形状,采用超短型多层遮光筒结构代替了传统设计中过长的外遮光罩。改变了遮光罩与主体结构的安装方式,将遮光罩嵌入式安装于空间遥感器的主体结构,最大限度地压缩了结构尺寸。以某航空相机光学载荷为例,分析了该种遮光罩的可行性和消杂散光效果。采用Light-tools软件优化设计了双层同心圆柱筒结构的遮光罩,并对该遮光罩的杂散光抑制效果进行了评估。模拟计算结果表明,外遮光罩采用超短型内嵌式结构后,遮光罩总长度和重量均减小为传统设计结果的1/3。系统的点源透过率(PST)曲线显示其整体呈下降趋势,且在离轴角大于25°后,光学系统的PST降低到10~(-7)以下。另外,设计的遮光罩能够有效抑制视场外杂散光,其杂散光抑制能力与其他离轴、同轴系统大体相当,满足使用需求。
In order to reduce the structural size of the space remote sensor and to facilitate its attitude control without affecting the stray light suppression effect, an ultra-short embedded shade is proposed. This paper introduces the basic structure of ultrashort embedded shades and its optimization design method. Redesigned the shape of the hood, the use of ultra-short multi-layer shade tube structure instead of the traditional design of the outer long hood. Changing the installation method of the sun visor and the main structure, and installing the sun visor into the main structure of the space remote sensor in an embedded manner to minimize the structure size. Taking the optical load of an aerial camera as an example, the feasibility of this type of sunshade and the effect of eliminating astigmatism are analyzed. Light-tools software was used to optimize the double concentric cylindrical structure of the hood, and the hood of the stray light suppression were evaluated. The simulation results show that the overall length and weight of the hood reduce to 1/3 of that of the traditional design after the outer hood adopts the ultra-short embedded structure. The point source transmittance (PST) curve of the system shows a downward trend overall, and after the off-axis angle is greater than 25 °, the PST of the optical system is reduced below 10 -7. In addition, the design of the hood can effectively inhibit stray light outside the field of view, its stray light suppression and other off-axis, coaxial system roughly equal to meet the needs of use.