一次性硬膜外腔内窥镜光学系统设计  

Design of optical system for disposable epidural endoscope

作　　者：李玉瑶 庞春颖[1] 杨羽[1] 孙晓玲[1] LI Yuyao;PANG Chunying;YANG Yu;SUN Xiaoling(School of Life Science and Technology,Changchun University of Science and Technology,Changchun 130022,China;Zhongshan Institute of Changchun University of Science and Technology,Zhongshan 528437,China)

机构地区：[1]长春理工大学生命科学技术学院,吉林长春130022 [2]长春理工大学中山研究院,广东中山528437

出　　处：《应用光学》2024年第5期896-902,共7页Journal of Applied Optics

基　　金：吉林省科技发展计划(20210401160YY)。

摘　　要：为了获得硬膜外腔的大视场清晰影像,利用Q-type非球面设计了工作波段为可见光,视场角为90°,F数为4,接收器为0.14 cm(1/18 inch)CMOS传感器的一次性硬膜外腔内窥镜光学系统。系统由3片塑料透镜和1片盖玻片组成,其中第3片透镜采用Q-type非球面,结构简单、紧凑、成本低。像质评价结果表明:在奈奎斯特频率200 lp/mm处各视场的调制传递函数均大于0.27,接近衍射极限;各视场均方根半径都小于像元尺寸2.5μm,均在艾里斑范围内;最大剩余畸变小于20%,满足高像质要求。最后,对系统的鬼像进行了分析与规避,结果表明,光瞳鬼像形成的光斑能量弥散,对像面照度均匀性影响较小;焦点鬼像形成的光斑尺寸远大于主像点列图,对成像质量影响较小,满足成像要求。In order to obtain wide-field and clear image of the epidural space,the disposable epidural space endoscopic optical system was designed using Q-type aspherical surface.The operating band was visible light,the field of view was 90°,the F-number was 4,and the receiver was a 1/18 inch CMOS sensor.The system was composed of three plastic lenses and one cover glass,and the third lens adopted Q-type aspherical surface.Therefore,the structure was simple,compact and low cost.The image quality evaluation results show that the modulation transfer function of each field of view is greater than 0.27 at the Nyquist frequency of 200 lp/mm,which is close to the diffraction limit.The root-mean-square radius of each field is less than the pixel size of 2.5μm,and all are within the Airy spot range.The maximum residual distortion is less than 20%,which meets the requirement of high image quality.Finally,the ghost image of the system was analyzed and evaded.It is shown that the energy of the spot formed by the pupil ghost image is diffused,which has little influence on the uniformity of image illuminance.The spot size of the focal ghost image is much larger than the spot diagram of the main image,which has little impact on the imaging quality and meets the imaging requirements.

关 键 词：光学系统设计 内窥镜 Q-type非球面 鬼像 

分 类 号：TN202[电子电信—物理电子学] O439[机械工程—光学工程]