Off-axis catadioptric middle and long wave infrared system based on spherical reflector

The present invention provides an off-axis catadioptric middle and long wave infrared system based on a spherical reflector. The system comprises a spherical reflector and a plurality of imaging compensation lens groups with diaphragms in order in a light propagation direction; each imaging compensation lens group with the diaphragm form one individual imaging channel; the whole system is an off-axis system to ensure that the imaging compensation lens groups are not mutually shielded with incident light, the spherical reflector is provided with a fixed eccentricity relative to an incident optical axis, and in order to match the reflection light, the compensation lens groups are inclined to allow the incident main light to be perpendicular to the compensation lens groups; the imaging compensation lens groups are distributed in a sector mode at the light-out position of a homocentric sphere reflector are not located on the same plane with the incident light; and the imaging compensationlens groups comprise shor