The Project Approachment And Design Of Airborne POD Optical System

In recent years, airborne pods develop very rapidly in foreign and constantlypursuit of long-range, high-resolution and all-weather imaging. Small and compactoptical system has also become a hot topic. At present, the technology level of ourcountry still exist some gaps compared with foreign, especially the pod systemwhich work in the high altitude. Therefore, this paper has designed an airborne podoptical system which can achieve long-range, high-resolution and all-weatherimaging, at the same time meet the needs of system miniaturization and lightweight.Firstly, this paper analyzed and summarized the existing catadioptric dual-bandstructure, and presented a new system design scheme which can achievehigh-resolution imaging and also has compact structure. Appropriate detectors wereselected combined with the current technical level. On this basis, the focal length,field of views and effective aperture of visible optical system and infrared systemwere selected respectively. After that, the selected parameters were verified by theoptical system detection ability.Secondly, the initial structure parameters of RC system was calculated by theaberration theory. Then the visible optical system and infrared system were designedby CODE V software after joined a beam splitter mirror. The visible optical systemwas joined compensation lens and the imaging quality meet the requirement. Theinfrared imaging system was corrected the aberration reasonably, and made the exitpupil and the cold stop of detector coincide by secondary imaging form. The imagequality of all systems were evaluated.Finally, this paper analyzed the key issues related to optical system. Thenon-thermal design of infrared system was achieved by optical passivecompensation method. Then the tolerance analysis was finished and given areasonable tolerance range. After the opti-mechanical model of optical system wasestablished, this paper analyzed the stray light by the optical calculation softwareTracepro. The main stray lights were suppressed. And the structure which exit theelement with high reflection coefficient between primary mirror and secondarymirror can meet the requirements of the stray light coefficient was also verified.