The Design And Research Of Object Lens In The Aviation Camera

Aerial cameras are widely used in resource surveys, topographic mapping, military reconnaissance and many other fields. The sort of aerial camera, the development at home and abroad and the theory of secondary spectrum is introduced. To meet the requirement for simple structure and high-resolution, the optical design of the apochromatism objective lens of aerial camera is achieved by common optical material. Objective's focal length is 400mm, relative aperture is F/4 and work waveband is 420nm～850nm. Designing results show that the MTF of every field above 0.75 in 601p/mm and satisfy the requirements of imaging for large frame array CCD whose effective size is 36mm×48mm.Under the conditions at high altitude photography, atmospheric pressure and temperature and many other environmental factors change will lead to camera defocus, thus affect the imaging quality of aerial camera. In this paper, the impact of objective lens of aerial camera's focal length by atmospheric pressure and temperature changes in the 2900m～3200m altitude were studied.