OPTICAL SYSTEM FOR FORMING AN INFRARED IMAGE Russian patent published in 2020 - IPC G02B13/16 

FIELD: optoelectronic instrument making.

SUBSTANCE: in an optical system for forming an infrared image, which includes installed on the beam path two groups of optical elements, and a matrix radiation receiver with a cooled diaphragm, where first group is made in the form of input lens, which builds in its focal plane an intermediate image, and second group is in form of projection lens, carrying out transfer of said image into plane of photosensitive elements of receiver, where exit pupil of optical system is aligned with cooled diaphragm of radiation receiver, first group of optical elements is made of series-installed mirror optical elements and lens corrector arranged in single housing, mirrors and housing are made from materials, temperature coefficients of linear expansion of which ensure preservation of optical quality and fixed position of plane of intermediate image. System includes installed with possibility of alternate input-output in plane of intermediate image field diaphragm and a test infrared radiator with an extended emitting surface consisting of sections of different contrast formed by at least two levels of radiation coefficient K₁ and K₂ (K₂>>K₁) with known spatial distribution and heated to temperature T₁, K, where T₁>T_{ambient medium}. Elements of the second group and the photodetector can realize the function of the focusing element, and the system is additionally equipped with signal control and processing units.

EFFECT: high quality of the optical system, accuracy and functional capabilities of calibrating its energy characteristics.

1 cl, 2 dwg