【摘要】 为提升关节内窥镜在临床手术中的成像性能并拓展其应用前景，设计了一种兼具大视场与高分辨率、可见光与近红外宽光谱齐焦成像特性的关节内窥镜光学系统。物镜通过大光焦度负透镜压缩主光线角度、减小轴外与轴上光线的光程差；并利用光阑共轭成像在转向棱镜内形成等效虚拟光阑，以在有限口径下兼顾大视场下的通光效率与高像质。中继镜采用三级近对称结构，通过光焦度与阿贝数分配有效抑制宽光谱传像过程中的轴向色差累积，从而实现齐焦成像。公差分析表明，该系统具有良好制造与装调可实现性。实验结果验证了所设计的宽光谱关节内窥镜在95°视场角下可实现可见光与近红外波段齐焦成像，角分辨力分别为4.34 C/(°)和2.74 C/(°)。本文所设计光学系统为低成本实现高性能荧光内窥镜提供了可行方案，具备重要的应用价值。更多还原

【Abstract】 To enhance the imaging performance of arthroscopes in clinical surgery and broaden their potential for clinical applications, a wide-spectrum arthroscopic optical system featuring a large field of view, high resolution, and parfocal imaging capability in both visible and near-infrared bands was designed. The objective lens uses a high optical power negative lens to compress the chief-ray angle and reduce the optical path difference between off-axis and on-axis rays. Through conjugate aperture imaging, an equivalent virtual stop is formed inside the turning prism, which allows the system to maintain both high transmission efficiency and high image quality under a limited aperture. The relay lens adopts a near-symmetric structure, and by distributing optical power and Abbe numbers appropriately, it effectively suppresses the accumulation of axial chromatic aberration across the broad spectral range, thereby achieving parfocal imaging. Tolerance analysis shows that the system has good manufacturability and assembly feasibility. Experimental results verify that the designed wide-spectrum arthroscope achieves parfocal imaging in the visible and near-infrared bands with a 95° field of view, and angular resolutions of 4.34 C/(°) and 2.74 C/(°), respectively. The optical system provides a feasible solution for achieving low-cost, high-performance fluorescence arthroscopy and has significant application value.更多还原