矩形反射镜结构支撑技术研究
发布时间：2019-03-08 17:53
【摘要】：大尺寸矩形反射镜结构支撑是离轴三反消像散(TMA)光学遥感器研制过程中的关键技术难点之一。以某临近空间光学遥感器的760 mm×320 mm三镜为研究对象,系统分析了环境温度对反射镜面型影响的本质原因,得出了温度适应范围与热膨胀系数差(反射镜与支撑结构)、反射镜接口承载能力、柔性支撑刚度之间的关系,形成了一套大口径光学反射镜结构支撑设计思路。提出了一种基于圆切口柔性铰的两轴正交反射镜柔性支撑结构,利用有限元对反射镜组件的光学面型和模态频率进行了仿真分析,通过正弦扫频实验对反射镜组件的结构频率进行了实际验证。在1g重力和10℃温度载荷的共同作用下,反射镜光学面型的最大均方根差(RMS)为13.4 nm,满足所提出的λ45(λ=632 nm)指标要求。反射镜组件最低阶模态频率的分析值和实验值分别为128.67 Hz和124.1 Hz,满足所提出的不低于100 Hz指标要求。
[Abstract]:The structure support of large-size rectangular reflector is one of the key technical difficulties in the development of off-axis three-inverse astigmatic (TMA) optical remote sensor. Taking a near-space optical remote sensor's 760 mm 脳 320 mm three-mirror as the research object, the essential causes of the influence of ambient temperature on the reflection mirror shape are systematically analyzed, and the difference between the temperature adaptation range and the thermal expansion coefficient (mirror and support structure) is obtained. The relationship between the load carrying capacity of reflector interface and the stiffness of flexible support has formed a set of support design ideas for large aperture optical reflector structure. A flexible supporting structure of two-axis orthogonal reflector based on circular notched flexible hinge is proposed. The optical surface shape and modal frequency of the reflector assembly are simulated and analyzed by finite element method. The structure frequency of mirror assembly is verified by sine sweep experiment. Under the interaction of 1 g gravity and 10 鈩，
本文编号：2437061
[Abstract]:The structure support of large-size rectangular reflector is one of the key technical difficulties in the development of off-axis three-inverse astigmatic (TMA) optical remote sensor. Taking a near-space optical remote sensor's 760 mm 脳 320 mm three-mirror as the research object, the essential causes of the influence of ambient temperature on the reflection mirror shape are systematically analyzed, and the difference between the temperature adaptation range and the thermal expansion coefficient (mirror and support structure) is obtained. The relationship between the load carrying capacity of reflector interface and the stiffness of flexible support has formed a set of support design ideas for large aperture optical reflector structure. A flexible supporting structure of two-axis orthogonal reflector based on circular notched flexible hinge is proposed. The optical surface shape and modal frequency of the reflector assembly are simulated and analyzed by finite element method. The structure frequency of mirror assembly is verified by sine sweep experiment. Under the interaction of 1 g gravity and 10 鈩，
本文编号：2437061
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