基于MTF一致性的波前编码相位板参数研究  

Study on the Parameter of Cubic Phase Mask of Wavefront Coding System Based on Consistency of MTF

作　　者：蔡怀宇[1] 吁乐锋[1] 王金玉[1] 黄战华[1] 方超[1] 

机构地区：[1]天津大学精密仪器与光电子工程学院,光电信息技术科学教育部重点实验室,天津300072

出　　处：《光学与光电技术》2009年第2期15-17,36,共4页Optics & Optoelectronic Technology

基　　金：国家自然科学基金(60677033)资助项目

摘　　要：波前编码成像系统因能够在不降低系统分辨率和入射光能量的情况下扩大非相干光学成像的景深(焦深)而倍受关注。在波前编码技术理论的基础上,以波前编码成像系统离焦时的MTF和未离焦时的MTF的均方差来表征系统离焦时的MTF一致性,即系统的离焦不变性,分析得到了三次相位板系数的合理选取范围。利用模糊函数的性质和系统传递信息能力分析相位板系数的选择对系统传递信息的影响,从而确定三次相位板参数选择的依据。Wavefront coding system has attracted great attention for its characteristic of depth of focus extension without decreasing the resolution and luminous flux. In the paper, the mean square deviation between out-of-focus MTF and in-focus MTF is used as a denotation of the focus invariance of the wavefront coding system with a cubic phase plate to analyze the focus invariance of the system and the effective range of the plate＇s coefficient. The effect of the cubic phase plate＇s coefficient on information transmission is also analyzed based on properties of ambiguity function and the information transmission capacity of the system. The basis of the reasonable range of the cubic phase plate is discussed at last.

关 键 词：波前编码 三次型相位板 焦深 光学传递函数 非相干成像 

分 类 号：O438[机械工程—光学工程] TN911.2[理学—光学]