Infrared sensor lights automatically by infrared emission Angle of the impact of the formation can not be effective in a wide range of sensor space.

In addition, we research atmospheric refraction influence to space-earth satellite communication, and put forward that amending emission Angle can eliminate excursion between beam and satellite.

Reduction of the focus hole diameter strongly affects the electrons with large emission angle but its influence on electron focusing is less markedly than the influence of the variations in potential.