OPTICAL SYSTEM OF THERMAL IMAGING DEVICE WITH TWO FIELDS OF VIEW Russian patent published in 2017 - IPC G02B13/14 G02B15/02 

FIELD: heat engineering.

SUBSTANCE: invention can be used in making thermal imaging devices with cooled matrix photodetectors. Optical system for thermal imaging device with two fields of view consists of arranged along optical axis first component, containing first positive, second negative and third positive convex-concave lenses, second component, having first negative concave-convex, second biconvex and third negative concave-convex lenses, third component, containing first biconvex, second negative concave-convex and third positive convex-concave lenses and photodetector with cooled diaphragm. Second component is installed with possibility of input/output into optical path. First component second and third lenses are installed with possibility of joint movement along optical axis.

EFFECT: technical result is improvement in operational capabilities due to system efficient operation at change of temperature in two fields of view while maintaining overall dimensions, decreasing weight and high image quality.

1 cl, 3 dwg, 3 tbl