利于像差校正的共形整流罩内表面面形设计

共形光学系统中，椭球形等厚度整流罩使入射的平行光线经过整流罩后不再平行，变为发散的光线，进而使系统像差急剧增加，不利于后续像差的校正。通过对等厚度共形整流罩的内表面进行重新设计，打破了共形整流罩的等厚度条件，从而在使用较少校正光学透镜的基础上实现了系统像差的校正。通过分析不同级次非球面分别作为整流罩内表面面形时的像差校正效果，确定了将6次非球面作为共形整流罩内表面面形初始结构。通过对内表面进行优化设计，最终得到整流罩内表面面形。结果表明，该方法有效地减小了共形整流罩引入的像差。最后使用固定校正器对内表面变化后的整流罩进行了像差校正，设计结果表明，内表面的改变有效地减少了光学元件数量，消像差效果良好。

Design of Conformal Dome Inner Surface Shape Beneficial to Aberration Correction

In a conformal optical system, the incident parallel light rays are no longer parallel when transmitting through an ellipsoidal dome, and transform into diverging light rays which greatly increase the system′s aberration. This is bad for the subsequent aberration correction. This paper breaks the condition of equal thickness and redesigns the inner surface of the conformal dome. Consequently, the aberrations of system are corrected by using less optical lenses when compared with equal thickness dome. By analyzing aberration correction results of different order aspheric surfaces as the inner surface of dome, six-order aspheric surface is selected as the initial structure. By optimizing the inner surface of dome, the final shape of inner surface is achieved. The results show that this method obviously reduces the aberrations induced by the conformal domes. Finally, aberrations of the conformal dome are corrected by using the fixed correctors. The results show that the number of the optical elements decreases by redesigning the inner surface of the dome, and this method has a good effect on correcting aberrations.