Dynamic aberrations correction of Roll-Nod conformal seeker based on the diffraction surface and anamorphic asphere surface
Dynamic aberrations correction of Roll-Nod conformal seeker based on the diffraction surface and anamorphic asphere surface
复制标题
基于衍射面和变形非球面的Roll-Nod共形导引头动态像差校正
DOI：
10.3788/col202018.072201
复制
发表时间：
2020-05
影响因子：
3.5
通讯作者：
Pan Guoqing
中科院分区：
文献类型：
--
作者：
Zhang Yunqiang;Chang Jun;Dang Fanyang;Bai Xiaodong;Pan Guoqing
传统的光学整流罩为球形，空气阻力系数较大，为了降低空气阻力系数，提出了共形光学技术，即对整流罩外表面进行流线型设计，但共形整流罩在视场（FOR）内会产生随视角变化而显著变化的动态像差，因此，共形整流罩的动态像差主要是由光学整流罩的动态像差引起的。动态像差的校正是共形光学的核心任务，本文提出了一种基于衍射面和变形非球面的动态像差校正方法，该方法是从拱形校正器发展而来的，仅适用于对于采用Roll-Nod框架的导引头，在共形整流罩的内表面上叠加一个衍射面来代替拱形校正器，并在成像系统中采用变形非球面来校正像散，与拱形校正器相比，设计结果表明，该方法在保持足够的设计自由度的前提下，可以减小校正元件的尺寸，在较大的FOR范围内，能够很好地校正动态像差，并且结构简单，该方法可以提高共形光学系统的可靠性，促进共形光学技术的应用。
Traditional optical domes are spherical,which have a large air resistance coefficient.In order to reduce the coefficient of air resistance,conformal optical technology was proposed,which used a streamlined design of the outer surface of the dome.However,conformal domes generate dynamic aberrations varying significantly with look angles in the field of regard(FOR).Thus,correcting the dynamic aberrations is the core task of conformal optics.This Letter presented a correcting method of dynamic aberrations based on the diffraction surface and anamorphic asphere surface.This method is derived from the arch corrector and can only be used on the Roll-Nod gimbal.For the seeker with a Roll-Nod gimbal,the arch corrector is replaced with a diffractive surface superimposed on the inner surface of the conformal dome.To correct astigmatism,which is the main aberration that needs to be corrected,anamorphic asphere surfaces are used in the imaging system.Compared with the arch corrector,this method can reduce the size of the correction element while retaining sufficient design freedom.Design results show that this method can well correct the dynamic aberrations in a larger FOR.With a simpler form in structure,this method can improve the reliability of conformal optical systems and promote the application of conformal optical technology.