The cover glass thermal and pressure deformation affect of optical performance in space image sensor

The space image sensor cover glass was bounded in 1atm air pressure in manufacture process. The air pressure and thermal radiation would affect the sensor cover glass deformation in space orbit. Therefore, this study was discussing the air pressure and thermal deformation on different sensor cover glass thickness affect optical performance in telescope system. The air pressure and thermal deformation of cover glass was simulating by FEM (finite element analysis) software. The deformation sag was transform to optical wave front error, and calculates telescope system MTF (Modulation Transfer Function). The result shown the cover glass thickness wasn´t sensitive to sagittal direction MTF in different image high. Meanwhile, the cover glass thickness increase, the tangential direction MTF would decline with image high increase.