1) Side looking infra red 
The SLIR (Service Laboratoire Infra Rouge) is a French research institute and government laboratory, founded at the end of the 1970s to coordinate the development of night vision equipment for the French army. The SLIR is part of the LETI (Laboratoire d`Electronique et Technologie de l`Information), a collection of government laboratories specia.....
Side Looking Infra Red