摘要
为了满足深海探测的需求，设计了大相对孔径、水下专用的变焦光学系统。对水下变焦系统的特点和设计方法进行了研究。采用机械式变焦方式，设计了像面尺寸为8．8mm×6．6mm，变倍比为2×的变焦光学系统。变焦过程中光学系统相对孔径保持不变，相对孔径为1／1．4，短焦端的全视场为66°，长焦端的全视场为36°，有效焦距范围5．9～11．8mm。变焦系统使用一片高阶非球面，系统总长为245mm。水密窗口采用圆顶壳式水窗，抗静压能力强。在短焦、中焦和长焦位置，空间频率42lp／mm处的轴上视场和1．0视场的光学传递函数值均大于0．6，另外系统各变焦位置的最大畸变均小于5％。变焦系统结构紧凑，成像质量良好，可以满足实际应用的需要。
In order to meet the requirements of deep-sea detection, an underwater optical zoom system with large relative aperture is designed. Characteristics and design principles of underwater zoom system are analyzed. The optical system is a mechanically compensated zoom system; its image size is 8.8 mm - 6.6 mm with zoom ratio of 2 X. Its F-number is kept constant at 1.4 during zooming process, In its short focal length mode, its field-of-view （FOV） is 66°, while its FOV in long focal length mode is 36° and its effective focal length ranges from 5.9 mm to 11.8 mm. The zoom system employs one high-order aspheric surface and its overall length is 245 mm. The water-air interface of the zoom system is the concentric lens which is able to withstand high static pressure. For short, middle and long focal length positions, the modulation transfer function （MTF） of the system is always larger than 0.6 for in-axis field and 1.0 field at the spatial frequency of 42 lp/mm. Moreover, the maximum distortion for all zoom positions in the whole FOV is less than 5 %, With compact design and high image quality, the zoom system can meet the requirements of practical application.
出处
《激光与光电子学进展》
CSCD
北大核心
2013年第9期147-153,共7页
Laser & Optoelectronics Progress
基金
国家自然科学基金(61275003)
教育部博士点基金(20101101110016)
深圳市基础研究计划(JC201005310719A)
"防生机器人与系统"教育部重点实验室2012年开放基金
关键词
光学设计
水下光学系统
变焦系统
大相对孔径
optical design
underwater optical system
zoom system
large relative aperture
