大景深显微成像方法研究  

Extension Characteristics of the Depth of Field for Microscopic System

作　　者：邹爽[1,2] 许忠保[1,2] 吕清花[3] 

机构地区：[1]湖北工业大学机械工程学院,武汉430068 [2]湖北省现代产品质量重点实验室,武汉430068 [3]华中科技大学光学与电子信息学院,武汉430074

出　　处：《光电工程》2013年第5期120-126,共7页Opto-Electronic Engineering

基　　金：国家自然科学基金资助项目(61077086);湖北省重点基金资助项目(2011CDA007);武汉市科技局攻关资助项目(201110821243)

摘　　要：为了扩大系统的景深,本文研究了基于"0、"二元纯相位模板增大系统景深的方法,并设计了一种三区环型二元相位模板。通过相位模板实现对系统光瞳的调制,使系统的MTF具有离焦不变性,从而避免了系统成像信息的丢失,达到增大景深的目的。最后利用光学设计软件Zemax分别对传统光学显微系统和增加了"0、"二元相位模板的大景深显微系统进行模拟,通过对比二者的成像结果可以得出:利用二元相位模板可以在保证较高分辨率的前提下,增大系统的景深。The depth of field of standard optical imaging system can be extended by introducing a pure phase pupil mask. A pupil mask which contains three zones with ＂0. π＂ phase is presented. By modulating the pupil of the imaging system, the Modulation Transfer Function （MTF） of the system has showed defocus-independent. Therefore, the loss of system＇s imaging information is avoided meanwhile the depth of the field is enlarged. Finally, the large depth of field system is simulated by Zemax as well as the traditional optical system. From the experimental results, we can draw the conclusion that the binary phase mask has successfully extended the depth of field of imaging system with a higher resolution.

关 键 词：景深扩展 相位模板 调制传递函数 

分 类 号：O438[机械工程—光学工程]