用于海空目标成像的水下超广角光学系统设计

Design of Underwater Optical System with Ultra Wide-Angle for Aeromarine-Target Imager

分析了水下超广角成像光学系统的设计特点。基于鱼眼镜头结构,设计了相对孔径为1/2,水下全视场为105°,焦距为6.8mm,光谱响应范围为可见光波段,采用同心球面罩的水下光学系统。该系统在空气中的全视场MTF在空间频率40lp/mm时均高于0.8;在水中时,在40lp/mm时,均高于0.4,能够满足水下光学系统对整个半球空域海空目标成像的要求。

The characteristics of design for special underwater image-forming optical system with ultra wide-angle are analyzed. Based on fish-eye lens type, an underwater optical system with the relative aperture of 1/2, field of view in underwater of 105°, the focal length of 6.8 rnm, and spectrum bandwidth of visible band, is designed. When the medium of the object space is air, the MTF of the whole field of view at 40 lp/mm is greater than 0. 8. When the medium ot the obiect space is changed to water, the MTF of the whole field of view at 40 lp/mm is greater than 0. 4, and it can meet the requirement of the underwater optical system to detect the aeromarine-target in whole semisphere airspace.