一种紧凑型光纤显微物镜的设计

针对光纤通信网络建设及运维任务对光纤接续机器提出的便携小巧、精准可靠的需求，开发了一种结构紧凑、成像清晰的光纤物镜。基于光学理论和实际使用要求对物镜的基本光学参数进行了分析，利用Zemax软件设计出一种紧凑型高分辨率的光纤显微物镜，该物镜包含5片常用牌号玻璃球面透镜，放大倍率为6×，数值孔径0.24，共轭距离47.3 mm。系统具有良好的成像质量，0.7视场内在奈奎斯特频率60 lp/mm处MTF大于0.36，在频率90 lp/mm处MTF大于0.15。对设计结果进行了蒙特卡罗公差分析，良品率超90%，装调较宽松，成本低廉，可进行批量生产。另外，针对设计好的物镜进行成像过程仿真，结果显示待接纤芯特征清晰锐利，有利于机器对准接续。

Design of compact fiber microscope objective

The construction, operation and maintenance of optical fiber communication network put forward the portable, compact, accurate and reliable requirements for the use of optical fiber connecting machine. To achieve this goal, an optical fiber objective with compact structure and clear imaging was developed. Based on optical theory and actual usage requirements, the basic optical parameters of the required objective were analyzed. An compact and high- resolution optical fiber microscope objective was designed by the Zemax software. The objective included 5 commonly used glass spherical lenses, with the magnification of 6 times, the numerical aperture of 0.24, and the conjugate distance of 47.3 mm. The objective system had the good imaging quality, in which the MTF was greater than 0.36 at the nyquist frequency of 60 lp/mm, greater than 0.15 at 90 lp/mm within 0.7 field of view. The design results were analyzed by Monte Carlo tolerance, and the yield rate was over 90%. The installation was loose and the cost was low, therefore the objective lens could be produced in large quantities. In addition, the imaging simulation of the designed objective lens shows that the features of the fiber core to be spliced are clear and sharp, which is beneficial to the alignment of the machines.