用于眼底成像的双光楔裂像电控调焦系统  

An electronically controlled focusing system using dual light wedge split image for fundus imaging

作　　者：盖俊帅 马玉婷 张运海[2] 杨皓旻[2] 刘玉龙[3] GAI Junshuai;MA Yuting;ZHANG Yunhai;YANG Haomin;LIU Yulong(College of Electronic and Information Engineering,Changchun University of Science and Technology,Changchun 130000,China;Jiangsu Key Laboratory of Medical Optics,Suzhou Institute of Biomedical Engineering and Technology,Chinese Academy of Science,Suzhou 215163,China;The Second Affiliated Hospital of Soochow University,Suzhou 215004,China)

机构地区：[1]长春理工大学电子信息工程学院,长春130000 [2]中国科学院苏州生物医学工程技术研究所江苏省医用光学重点实验室,苏州215163 [3]苏州大学附属第二医院,苏州215004

出　　处：《激光技术》2024年第4期484-490,共7页Laser Technology

基　　金：山东省自然科学基金资助项目(ZR2020QF103);苏州市临床重点病种诊疗技术专项基金资助项目(LCZX202105);核医科技创新计划资助项目(ZHYLZD2021001);中国宝原科研基金资助项目(270001);中国科学院青年创新促进会项目(2020323)。

摘　　要：为了实现眼底成像时的精准调焦,设计了双光楔裂像电控调焦系统。采用905 nm近红外半导体激光经双光楔和矩形狭缝在视网膜上形成矩形视标的方法,通过电机控制视度补偿镜和双光楔机构移动,得出视度补偿镜和双光楔位移关联关系;根据矩形视标分离情况实时反馈离焦补偿状态,指导控制系统移动双光楔和视度补偿镜,实现眼底成像时的准确调焦,在模拟眼上开展了眼底成像调焦实验。结果表明,系统可实现-10 m^(-1)~10 m^(-1)屈光度补偿,调焦精度在1 m^(-1)以上。该双光楔裂像电控调焦系统调焦速度快、精度高,为发展自动眼底成像仪器提供了基础。In order to achieve precise focusing during fundus imaging,an electronically controlled focusing system using dual light wedge split image was designed.A 905 nm near-infrared semiconductor laser was used to form a rectangular sight mark on the retina through a dual light wedge and a rectangular slit.The movement of the sight compensation mirror and the dual light wedge mechanism was realized by motor control,and the displacement correlation between the sight compensation mirror and the dual light wedge was obtained.According to the separation of the rectangular sight mark,the defocus compensation state was real-time feedback,and the control system was guided to move the dual light wedge and the sight compensation mirror to achieve accurate focusing during fundus imaging.The focusing experiment of fundus imaging was conducted on the simulated eye,and the result showed that system can achieve-10 m^(-1)~10 m^(-1)refractive compensation,and the focusing accuracy was more than 1 m^(-1).The electronically controlled focusing system using dual light wedge split image has fast focusing speed and high precision,which provides a basis for the development of automatic fundus imaging instruments.

关 键 词：激光技术 离焦补偿 闭环控制 视标 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]