Heat flux analysis of space camera with thermal door

Thermal stability is an important parameter which can affect the optical ability of large aperture space camera. Most of space cameras with large aperture and high resolution need high thermal stability, which means the temperature gradient should be no more than 2°C. This situation causes that the thermal control system should increase the design criteria to meet the challenge. Space heat flux including vertical incident solar rays, infrared radiation from earth and solar rays reflected by earth are the major factors which affect the temperature flied of the camera. The space heat flux of some agility remote sensing satellite changes within a wide-range. In this paper comparison of using thermal door or not in such camera is introduced. The heat flux of the space camera is analyzed and the effect of thermal control system is described.