基于掩膜相位板的鼻内镜成像优化研究  

Optimization of nasal endoscopic imaging based on phase plate

作　　者：李琦[1] 董萌[1] LI Qi;DONG Meng(College of Optoelectronic Engineering,Changchun Univ.of Tech.,Changchun 130022,China)

机构地区：[1]长春理工大学光电工程学院,吉林长春130022

出　　处：《光学技术》2023年第4期508-512,共5页Optical Technique

基　　金：吉林省科技厅项目大景深4K荧光复合内窥镜系统与三晶片影像工作站的研发(20200404157YY)。

摘　　要：我国鼻内窥镜受加工,装调等因素的影响,内窥镜在实际使用时的分辨率及像差情况要明显差于设计水平,论文经过公差分析,得出偏心公差对结果影响巨大,基于以上问题,文章在设计的一款视场角为80°,入瞳直径为0.2mm的鼻窦物镜基础上,模拟装调误差,提出在不改变装调后鼻窦物镜机械结构的前提下,在物镜保护玻璃前方加入掩膜相位板补偿装调误差导致的成像质量下降;从设计结果可知,添加掩膜相位板后系统传函图从在空间频率30lp/mm等于0提升到170lp/mm大于0.2;用N3鉴别率板检测系统分辨率,物方可分辨18组左右,物方分辨率为15μm。由此可知在补偿掩膜相位板的设计中,在不改变原设计基础上,可明显提高像质。Due to the influence of processing,installation and adjustment of nasal endoscopes in China,the resolution and aberration of endoscopes in actual use are significantly worse than the design level.Through tolerance analysis,it is concluded that the eccentric tolerance has a great impact on the results.Based on the above problems,the installation and adjustment error on the basis of a nasal sinus objective are simulated with a field angle of view of 80°and an entrance pupil diameter of 0.2mm,It is proposed that a phase plate is added in front of the protective glass of the objective lens to compensate for the decline of imaging quality caused by the assembly and adjustment error without changing the mechanical structure of the post assembly and adjustment nasal sinus objective lens;It can be seen from the design results that after adding the phase plate,the system transmission diagram increases from 30LP/mm equal to 0 to 170LP/mm greater than 0.2;Using N3 discrimination plate to detect the system resolution,about 18 groups of objects can be distinguished,and the object resolution is 15μm.It can be seen that the design based on the compensation phase plate can significantly improve the image quality without changing the original design.

关 键 词：鼻窦物镜 偏心误差 掩膜相位板 像质分析 

分 类 号：TB133[机械工程—光学工程]