空间相机反射镜组件的胶结技术

为了保证口径为320 mm的反射镜粘胶前后面形精度变化较小,同时组件的动静态刚度满足使用要求,对空间相机反射镜的胶结技术进行了研究。首先,得出了六条均布粘胶和沿芯轴外环全粘胶两种粘胶方案的具体参数,并采用有限元的方法对两种方案进行了静刚度分析与光学性能分析;其次,在反射镜裸镜面形为0.030(=632.8)时,分别检测了采用这两种粘胶方案装配后反射镜的面形精度;最后,对反射镜组件进行了振动试验。分析与试验表明:采用六条均布粘胶方案装配后,进行振动试验组件完好无损,测得一阶频率为144.194 Hz,与有限元分析相对误差为1.23%,动静态刚度满足需求,同时对比外环全粘胶反射镜面形精度提高了13.5%。结果显示六条粘胶方案更适用于320 mm反射镜组件的粘结。

Bonding technique of mirror components in space camera

In order to ensure the surface form precision of a mirror whose caliber is 320 mm changes as small as possible before and after bonding, while static and dynamic stiffness of the mirror components meet the requirements, bonding technique of primary mirror in space camera was studied. Firstly, specific bonding parameters of six bonds and round bonds were achieved. Then, the finite element analysis for two bonding options was carried out to analyze static stiffness and optical properties. Finally, when the mirror's surface form precision was 0.030(=632.8), the surface form precision of the mirror was tested. Besides, vibration test of mirror components was conducted. Analysis and experiment results indicate that after using six bonds option to assemble the mirror components, its first order frequency is 144.194 Hz and static and dynamic stiffness meet the requirements. Compared to round bonds option, the surface form precision of the mirror improves 13.5%. This results mean that the six bonds option is better for bonding the mirror whose caliber is near 320 mm.