相位板偏心对波前编码系统的成像影响分析  

Analysis of Effect of Phase Plate Decenter on Wavefront Coding Imaging

作　　者：郭小虎[1] 赵跃进[1] 董立泉[1] 刘明[1] 孔令琴[1] 吴益剑 

机构地区：[1]北京理工大学光电学院精密光电测试仪器及技术北京市重点实验室,北京100081

出　　处：《中国激光》2015年第8期279-287,共9页Chinese Journal of Lasers

基　　金：国家自然科学基金(61377109)

摘　　要：理论及实验分析了三次相位板的偏心对波前编码成像的影响。理论分析得到相位板倾斜和偏心后的波前编码系统的光瞳函数相位项的表达式。分析表明,当仅有偏心时,相位板位置变化会产生相位因子的变化效应和离焦量的改变,它们均与相位板的偏移量相关。同时仿真结果表明,偏心会改变点扩散函数(PSF)的能量分布及PSF包络的两条直角边长度,降低系统的调制传递函数(MTF)值;z向偏心对PSF的影响小于x向或y向的偏心对PSF的影响。实验结果表明,偏心在一定的范围内对PSF的影响较小,复原图像在焦深范围内的清晰度一致性较好;但是偏心会降低焦深延拓率。实验结果与理论分析结果具有良好的一致性。研究结果对基于相位掩模板的波前编码系统在空间光学系统、显微系统、红外成像等领域的应用具有较高的参考价值。The impact of cubic phase plate decenter on the imaging of wavefront coding system is analyzed, and the phase component of pupil function of wavefront coding system with the tilt and decenter parameters is calculated. It presents that decenter can also enlarge or reduce the phase factor and the amount of defocus. The simulation indicates that the decenter makes the system modulation transfer function（MTF） drop through changing the energy distribution and the sagittal or meridional length of point spread function（PSF）. It also indicates that the effect of z-direction decenter is lower than that of x-direction or y-direction decenter. The experimental results show that decenter has lower influence on PSF in a certain range, and the clarity of restored images has excellent consistency in the range of depth of focus, but extension of depth of focus drops with decenter. The experimental results confirm the analysis of decenter. This study has high application value in the space optical system,microscopy system, and infrared imaging system with the wavefront coding technology.

关 键 词：成像系统 波前编码 三次相位板 偏心 相位因子 离焦量 

分 类 号：O439[机械工程—光学工程]