用于水下微光监控系统的成像系统设计

摘要

An underwater low light imaging optical system is designed to improve imaging effect, resolution and sensitivity of underwater video. Image intensifier assembly is used to increase the sensitivity of underwater mon⁃itoring system. Optical lens and illumination light sources with large relative aperture and large field of view (FOV) angle are used at the same time. An underwater low light level monitoring imaging objective with 1/2 relative aper⁃ture and 50°underwater FOV angle is designed with 10 optical elements through optimization combination based on inverse telephoto structure. Quality assesments show that the optical system has an excellent imaging quality, modu⁃lation transfer funtion (MTF) is better than 0.5 at 65 lp/mm, and all the specifications meet the requirements of un⁃derwater low light level monitoring.%为了改善水下微光环境下成像效果，提高水下视频的清晰度和灵敏度，设计了用于水下的微光成像光学系统。采用像增强组件增大水下监控系统的灵敏度，同时配合大相对孔径和大视场角的光学物镜及照明光源。基于反摄远结构，通过优化玻璃组合采用10片玻璃设计了一个相对孔径为1/2，水下视场角为50°的水下监控用成像物镜，经过质量评价后表明，该光学系统成像质量较好，MTF在65 lp/mm时对比度达0.5以上，各项性能指标能够满足目前水下监控的需求。