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介绍了一种新型的空间望远镜,通过改变光学系统焦距,可以提高任意感兴趣视场的成像分辨率。光学系统有四个反射镜组成,包括两个静态非球面反射镜和两个面形动态可调非球面反射镜.通过改变两个可变形反射镜的面形,系统焦距可以在399mm到558mm范围内进行动态调整.和机械式变焦系统相比,此主动变焦系统避免了光学元件的精密移动,有效减少反应时间。分析了此系统的成像质量,给出了0°、0.51°、0.7°不同视场的弥散斑:1.6μm、1.0μm、1.7μm,及传递函数:在68lp/mm时,MTF曲线值大于0.7.此新型成像技术还可以有效减少数据传输链带宽需求,在遥感领域具有广阔的应用前景.
A new type of space telescope is introduced, which can improve the imaging resolution of any interested field of view by changing the focal length of the optical system. The optical system consists of four mirrors, including two static aspheric mirrors and two surface-shape dynamically adjustable aspherical mirrors, and the system focal length can be in the range of 399mm to 558mm by changing the shape of the two deformable mirrors Within the dynamic adjustment.Compared with the mechanical zoom system, this active zoom system to avoid the precise movement of optical components, effectively reducing the reaction time. The imaging quality of the system was analyzed. The diffusion spots of different field of view at 0 °, 0.51 ° and 0.7 ° were given: 1.6μm, 1.0μm and 1.7μm, and the transfer function: At 68lp / mm, MTF curve was greater than 0.7 This new imaging technology can also effectively reduce the data transmission chain bandwidth requirements and has broad application prospects in the field of remote sensing.