激光与光电子学进展, 2017, 54 (10): 100101, 网络出版: 2017-10-09
应用于海洋监测的水下变焦镜头设计
Design of Underwater Zoom Lens for Marine Monitoring
摘要
设计了大相对孔径的三档变焦光学系统来监控海洋生态监测仪器的工作状态。该系统的设计通过Zemax软件实现, 总长度为200 mm, 系统采用6.4 mm×4.8 mm的CCD感光板, 三档变焦焦距分别为8, 14, 28 mm, 变焦过程中相对孔径为1/1.4, 短焦时最大视场角为52°。最大视场角下, 当奈奎斯特频率为42 lp/mm 时, 系统的0视场的调制传递函数(MTF)值为0.8, 0.707视场的平均MTF值为0.7, 1视场的平均MTF值达0.6; 10 μm范围内, 几何包围能量均在90%; 畸变控制在合理的范围。该系统变焦比高、结构简单、相对孔径大, 适用于海水中海洋生态监测仪器的监控, 能够及时地反馈海洋生态监测仪器的工作状态信息, 大大降低了海洋生态监测仪器的维护成本。
Abstract
In order to monitor the working status of marine ecological monitoring instruments, a three-gear zoom optical system with large relative aperture is designed. This system is designed with Zemax software and its total length is 200 mm. The system uses a 6.4 mm×4.8 mm CCD camera, and the three-gear zoom focal lengths are 8, 14, and 28 mm, respectively. The relative aperture remains at 1/1.4 during zoom process. The maximum field of view is 52° with short focus. At maximum field angle, when the Nyquist frequency is 42 lp/mm, the modulation transfer function (MTF) of the system at 0 field of view is 0.8, the average MTF is 0.7 at 0.707 field of view, and the average MTF value at 1 field of view reaches 0.6. In 10 μm range, the diffraction encircled energy is 90%, and distortion control is in a reasonable range. The system has high zoom ratio, simple structure and large relative aperture. It is suitable for monitoring the marine ecological monitoring instruments and can timely feedback their working status information. Therefore it greatly reduces the maintenance cost of marine ecological monitoring equipment.
马海宽, 曹煊, 褚东志, 吴宁, 马然, 张述伟, 史倩. 应用于海洋监测的水下变焦镜头设计[J]. 激光与光电子学进展, 2017, 54(10): 100101. Ma Haikuan, Cao Xuan, Chu Dongzhi, Wu Ning, Ma Ran, Zhang Shuwei, Shi Qian. Design of Underwater Zoom Lens for Marine Monitoring[J]. Laser & Optoelectronics Progress, 2017, 54(10): 100101.