Selectable field infrared imager and lens set

Details Selectable field infrared imager and lens set Selectable field infrared imager and lens set

1987-10-22

1989-05-02

Howell, Janice A.

Radiant energy

Infrared-to-visible imaging

Including detector array

250352, 250353, 350 13, G01J 142

Patent

active

048271306

ABSTRACT:
An infrared imager includes an array of imager elements. Infrared radiation is focussed onto the array by a lens assembly including a plurality of lens elements. The imager array and the lens are within a cold box which includes an infrared-transparent window. For low noise, a spectrum-limiting filter is also located within the cold box, between the lens assembly and the window, at or within the pupil relief distance of the lens assembly. The pupil relief distance is extended by the use of at least one aspheric surface for one of the lens elements of the lens assembly. The mounting structure of the filter is the aperture stop for the infrared imager. The field of view may be reduced, if desired, without significant effect on the noise performance by use of a telescope including a second lens assembly optically identical to the first lens assembly, operated in conjunction with a confocal large-diameter lens assembly.

REFERENCES:
patent: 4041314 (1977-08-01), Oppelt
patent: 4421985 (1983-12-01), Billingsley et al.
patent: 4427259 (1984-01-01), Fieldsted
patent: 4431917 (1984-02-01), Gibbons
patent: 4507551 (1985-03-01), Howard et al.
patent: 4558222 (1985-12-01), Neil
patent: 4761556 (1988-08-01), Simpson et al.
patent: 4783593 (1988-11-01), Noble

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