波前编码对同轴反射系统失调像散钝化研究

On Misaligned Astigmatism Passivation of Coaxial Reflection System by Wavefront Coding

矢量像差理论表明,一个已经校正过初级像差的光学系统,在微小失调量状态下仍会出现特定的像差表现,而工作在恶劣环境下的机载、星载光学系统这种情况尤为明显。波前编码技术已被证实对一阶、三阶像差有一定的钝化作用,基于波前编码原理,从矢量像差的角度研究了三次相位板对光学系统失调产生像散的钝化作用,并以卡式折反系统为例做了仿真验证。研究显示,波前编码计算成像系统对于元件倾斜引起的失调像散不敏感,系统轻微失调时仍能保持良好的成像效果,这对于降低光学系统的装调难度以及增强机载、星载光学系统的环境适应性具有一定的意义。

The vector aberration theory shows that an optical system that has corrected the primary aberration will still have aberration performance in the state of small misalignment which is particularly significant for airborne and spaceborne optical systems working in harsh environments.Wavefront coding technology has been proved to have a certain passivation effect on the first-order and third-order aberrations.Based on the principle of wavefront coding this paper studies the passivation effect of the third-order phase plate on the astigmatism caused by the misalignment of the optical system from the perspective of vector aberration and takes the Cassegrain system as an example for simulation verification.The research shows that the wavefront coding computational imaging system is not sensitive to the misalignment astigmatism caused by the tilt of components.It can maintain good imaging effect when the system is slightly misaligned.This has certain significance for reducing the difficulty of optical system installation and adjustment and enhancing the environmental adaptability of airborne and spaceborne optical systems.