数码裂隙灯显微镜光学系统的设计与实现

利用光学设计软件Zemax设计了一套具有6×, 10×, 16×, 25×与40×放大倍率的五档式数码裂隙灯显微镜光学系统.在传统体视裂隙灯显微镜光学系统结构的基础上将数码型裂隙灯显微镜划分为共用前置物镜、伽利略望远镜、摄影物镜三部分, 用平行式伽利略望远镜系统结构来改变倍率.研究了共用前置物镜、伽利略望远镜及摄影物镜的光学特性与技术指标要求, 选取了合适的透镜类型.在共轴时拥有良好的成像质量基础下, 将光学系统过渡到非共轴情况, 再进行优化.优化后除40×时衍射极限较低外, 在6×, 10×, 16×, 25×情况下系统调制传递函数曲线值在空间频率为115 lp/mm处基本大于0.2, 点列图显示不同倍率下的弥散斑大小均基本小于艾里斑.该光学系统具有良好的成像效果, 且整体结构简单, 易加工, 成本低, 其性能很好地满足了整机要求.

Abstract

A set of 6×, 10×, 16×, 25× and 40× magnifications of digital slit-lamp microscope optical system is designed with Zemax. The optical system structure of traditional stereo slit-lamp microscope is analyzed, on its basis, the digital slit-lamp is divided into shared front-objective, Galileo telescope and photographic lens, using parallel Galileo telescope system structure to change rate. The optical properties and the technical indicators of shared front-objective, Galileo telescope and photographic lens are discussed, and the appropriate type of the lens is selected. Under the good imaging quality foundation in coaxial situation, the optical system is carried out the transition to non-coaxial and optimized. The modulation transfer function curve values are mainly greater than 0.2 at the position of 115 lp/mm in 6×, 10×, 16×, 25× except the low diffraction limit at 40×, and the spot diagram shows that the spot size in different magnifications are substantially less than the Airy disk. The lens has a good imaging effect with simple structure, easy processing and low cost.

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数码裂隙灯显微镜光学系统的设计与实现

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