OPTICAL THERMAL IMAGING SYSTEM FOR MID-INFRARED SPECTRAL REGION Russian patent published in 2015 - IPC G02B13/14 G02B13/16 G02B9/60 

FIELD: physics.

SUBSTANCE: optical thermal imaging system comprises, arranged on a beam path, an input lens which constructs a real intermediate image and a projection lens placed in front of a photodetector. The input lens has two components in the form of two series-arranged positive and negative menisci which face the object space with their convex side. The projection lens has three components made from, arranged in series on the beam path, a first negative meniscus, a biconvex lens and a third positive meniscus facing the object space with its convex side.

EFFECT: fewer optical elements with diffraction-limited image quality.

3 dwg, 1 tbl