基于反向旋转位相板的共形光学系统设计

在共形光学系统中,椭球形整流罩打破了球形整流罩的旋转对称性,引入了随目标视场变化而变化的动态像差。共形光学设计的主要任务就是消除或者减小椭球形整流罩引入的动态像差,使共形光学系统的成像质量满足使用要求。设计了基于反向旋转位相板的共形光学系统,利用一对反向旋转位相板的反向旋转对目标视场进行动态扫描,利用固定校正器、衍射元件和泽尼克位相板校正了椭球形整流罩引入的动态像差。成像系统采用二次成像的透射式结构,实现了冷光阑效率100%。结果表明:该方法不仅有别于传统扫描方式,而且有效地消除了大长径比的共形光学系统的动态像差。

Conformal Optical System Design Based on Reverse Rotating Phase Plate

In conformal optical systems, the ellipsoidal domes lose the property of rotational syrmnetry, leading to a variety of dynamic aberrations varying with different look angles. In order to achieve better imaging quality, reducing the dynamic aberrations become the main mission of eonformal optical design. In this paper, a conformal optical system based on reverse rotating phase plates is designed. Different field of regards is scanned by reverse rotating the phase plates. The fixed correc- tors, diffractive optical elements and Zernike phase plates are used to correct the dynamic aberrations of the ellipsoidal dome. With secondary imaging, the exit pupil of the conformal optical system coincides with the cooled stop of the detector. The conformal optical system reaches 100% cooled efficiency. The results show that the method presented in this paper is not only different from traditional scanning forms, but also efficient in eliminating the dynamic aberrations of the conformal optical system with larger fineness ratio.