Dual band/dual FOV infrared telescope

Details Dual band/dual FOV infrared telescope Dual band/dual FOV infrared telescope

1988-10-31

1991-02-05

Arnold, Bruce Y.

350 12, 350423, 350463, G02B 2300, G02B 1500, G02B 1524

Patent

active

049899627

ABSTRACT:
A dual field of view telescope for operating in both the medium infrared spectral band from 3.8 to 5 micrometers and the long infrared spectral band from 8 to 11.5 micrometers. The telescope includes an objective lens group A and an eyepiece lens group B. All of the lenses of each group are made of zinc sulfide, germanium or nonoxide chalcogenide glass. One of the lenses in the objective lens group is a negative germanium lens A3 which serves to correct for residual axial chromatic aberrations in both IR bands due to its different dispersion characteristics in these two bands.

REFERENCES:
patent: 3941923 (1976-03-01), Wheeler
patent: 4030805 (1977-06-01), Rogers
patent: 4199217 (1980-04-01), Rogers
patent: 4431917 (1984-02-01), Gibbons
patent: 4494819 (1985-01-01), Lidwell
patent: 4802717 (1989-02-01), Kebo
patent: 4871219 (1989-10-01), Cooper

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