Thermal imaging system and method using scene-average radiation

Details Thermal imaging system and method using scene-average radiation Thermal imaging system and method using scene-average radiation

1990-06-29

1992-08-04

Henry, Jon W.

Optical: systems and elements

Having significant infrared or ultraviolet property

Having folded optical path

359353, 359726, 359834, 250347, 250353, G01J 548, G01J 554, G02B 504

Patent

active

051364212

ABSTRACT:
A pupil/image reversal prism (FIG. 2) forms a pupil at an image location. Such a prism has specific applicability in a DCR scheme for a thermal imaging system (FIG. 3a, 31 and 32) in which a passive DCR source is implemented by a pupil imager that forms a pupil onto the image of a thermal scene, thereby providing scene-average radiation to a thermal detector array. The pupil/image reversal prism including an input reflective surface (A), an output reflective surface (B), a positive reflective surface (C) and an intermediate folding reflective surface (D). The reflective surfaces A and B use total internal reflection to provide both transmissive and reflective operation.

REFERENCES:
patent: 4158136 (1979-06-01), Felix et al.
patent: 4873442 (1989-10-01), Klatt

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