Optical Design of Cassegrain System with Asperical Surfaces on CCD Airborne Remote Sensing Camera

Based on the Ritchey-Chretien system, a refractive/reflective system with four aspheric surfaces (including two high order aspheric surfaces) was designed with the help of CODE V software. It has a focal length of 880mm, F number of 5.6, waveband of 0.43-0.7um, and field of view reaches 3°. It is shown that the value of modulation transfer function is higher than 0.5 at 60lp/mm, image quality reaches the diffraction limit. The system with simpler structure, smaller size and lighter weight, can be used in high altitude airborne remote sensing.