基于自由曲面校正器的机身共形光学系统设计

Design of Fuselage Conformal Optical System Based on Freeform Correctors

现有扫描式机身共形光学系统均使用了动态校正器,但动态校正器的使用会造成光学系统稳定性差且光机结构复杂。为提高机身共形光学系统在实际应用中的稳定性,简化光机结构,提出了一种基于自由曲面校正器的机身共形光学系统静态校正方法。基于飞机应用,利用该校正方法设计了一个瞬时视场为3°、全扫描视场为30°的机身共形光学系统。设计结果表明:通过在倾斜的共形窗口后面加入两个倾斜的静态自由曲面校正器,可使共形窗口引入的静态像差和动态像差均得到校正,整个共形光学系统在各扫描视场位置的成像质量均接近衍射极限。同时,相比于动态校正器,静态自由曲面校正器的使用提升了该系统的稳定性,简化了系统的光机结构。

Existing scanning fuselage conformal optical systems all contain dynamic correctors. However, the stability of the optical system with dynamic corrector is poor and the structure is complex. To improve the stability of fuselage conformal optical systems for application and simplify the system structure, a static correction method used in fuselage conformal optical system which is based on freeform correctors is proposed. Based on aircraft applications, a conformal optical system with 3~ field of view and 30~ field of regard is designed by the method. The design results show that by adding two tilted freeform correctors behind the tilted conformal window, the static aberration and dynamic aberration introduced by the conformal window are corrected and the image quality of the conformal optical system is near the diffraction limit at every field of regard. Moreover, compared with dynamic correctors, the static freeform correctors enhance the stability of the optical system and simplify the system structure.