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为研究连续型相位光瞳滤波器对光学成像系统成像效果的影响,并实现对远场光学成像系统分辨率的提升,设计了一种多项式函数形式的相位型光瞳滤波器,证明其可以实现三维超分辨。给出了其与一种典型三区型相位光瞳滤波器的超分辨效果的对比。通过对比可以发现,在分辨效果的改善上,横向分辨率有明显提升,但施特雷尔比会有所下降。此外,由于此种形式光瞳滤波器可以通过提高多项式次数来增加可调参数,因此其对超分辨效果的提升还有一定的改善空间。关于多项式函数形式的相位光瞳滤波器的计算结果,对实际中制作连续相位型光瞳滤波器亦有一定的参考价值。
In order to study the effect of continuous phase pupil filter on the imaging performance of optical imaging system and to improve the resolution of far-field optical imaging system, a phase-type pupil filter in the form of polynomial function is designed to prove that it can achieve Three-dimensional super-resolution. A comparison of super-resolution with a typical three-region phase-pupil filter is given. By contrast, we can see that in the improvement of the resolution, the horizontal resolution is obviously improved, but the Strier ratio will decrease. In addition, since this form of the pupil filter can increase the adjustable parameters by increasing the number of polynomials, there is still room for improvement in improving the super-resolution effect. The calculation results of the phase pupil filter in the form of polynomial functions also have certain reference value in the practice of making continuous phase type pupil filter.