Dual element passively athemalized infrared imaging systems

摘要

A passively athermalized infrared imaging system includes an object side meniscus lens that forms at least one aspheric surface, and an image side meniscus lens that forms two aspheric surfaces. Each of the meniscus lenses are formed of a material selected from the group consisting of a chalcogenide glass, germanium, silicon, gallium arsenide, zinc selenide and glass. An optical power of the image side meniscus lens is at least 1.6 times an optical power of the object side meniscus lens such that an effective focus position of the imaging system is athermalized over a range of 0 to +40 degrees Celsius.

主权项

1. A passively athermalized infrared imaging system, comprising:
a single, positive object side meniscuslens that forms at least one aspheric surface, and a single, positive image side meniscus singlet lens that forms two aspheric surfaces, each of the meniscus lenses formed of a material selected from the group consisting of a chalcogenide glass, germanium, silicon, gallium arsenide, zinc selenide and glass; an optical power of the image side meniscus lens being at least 1.6 times an optical power of the object side meniscus lens; such that an effective focus position of the imaging system is athermalized over a range of 0 to +40 degrees Celsius; wherein the object side meniscus singlet lens and the image side meniscus singlet lens are the only powered lenses in the passively athermalized infrared imaging system.