Infra-red lenses

Details Infra-red lenses Infra-red lenses

1985-07-03

1987-07-14

Arnold, Bruce Y.

350 14, 350474, G02F 102, G02B 912, G02B 934

Patent

active

046798919

ABSTRACT:
An optically athermalized infra-red lens has a group of a least three closely spaced lens elements of different respective materials having positive thermal coefficients of refractive index. Two of the elements are of materials whose refractive indices are relatively temperature insensitive, one, e.g. of zinc selenide or chalcogenide glass, being positively powered and the other, e.g. of zinc sulphide, being negatively powered to effect achromatization and correct spherical aberration. The third element is negatively powered and of a relatively temperature senitive refractive index material, e.g. germanium, of lower dispersion and higher refractive index than the other two. The lens may be the objective of an afocal telescope having an eyepiece and associated scanner and detector arrangement and may effectively athermalize the whole system.

REFERENCES:
patent: 4505535 (1985-03-01), Neil

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