Dual infrared band objective lens

Details Dual infrared band objective lens Dual infrared band objective lens

1998-08-07

2008-08-05

Hellner, Mark (Department: 3662)

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

C359S356000

Reexamination Certificate

active

07408159

ABSTRACT:
An infrared refractive lens triplet having color correction properties for radiation within the 3 to 12 micrometer spectral band for use with a quantum well detector for simultaneous dual band imagery. In certain embodiments of the invention, two widely spaced triplets form a Petzval-type objective lens. Each lens triplet is made up of a negative zinc sulfide lens, a positive zinc selenide lens, and a negative gallium arsenide lens coaxially positioned along a chief ray of the lens system.

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M.O. Lidwell, “Achromatism of lenses for thermal IR,”Proceedings SPIE, vol. 518, 1984, pp. 73-80.
M. Roberts et al., “Wide waveband infrared optics,”Proceedings SPIE, vol. 1013, 1988, pp. 84-91.

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