Cold shielding of infrared detectors

Details Cold shielding of infrared detectors Cold shielding of infrared detectors

1989-09-14

1990-11-20

Fields, Carolyn E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250332, G01J 506, G01J 508

Patent

active

049720856

ABSTRACT:
An infrared detection system is disclosed in which a re-imaging optical system produces a non-axisymmetric aperture stop image at an exit pupil point in or near the cold shield entrance aperture. To achieve high cold shield efficiency notwithstanding the asymmetry of the aperture stop image and the resulting astigmatism in such image, two exit pupil stop members disposed in non-coplanar relation are provided adjacent the exit pupil point. The stop aperture in one such member has its radially extending edges congruent with the corresponding edges of the aperture stop image and is disposed in the plane of best exit pupil formation for those edges; the aperture in the other exit pupil stop member is correspondingly configured and oriented with respect to the circumferential edges of the aperture stop image.

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patent: 3601611 (1971-08-01), Kendall
patent: 4383173 (1983-05-01), Neil et al.
patent: 4431917 (1984-04-01), Gibbons
patent: 4431918 (1984-04-01), White
patent: 4507551 (1985-03-01), Howard et al.
patent: 4558222 (1985-12-01), Neil
patent: 4783593 (1988-11-01), Noble

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