Optical device for reversing pupil and image

Details Optical device for reversing pupil and image Optical device for reversing pupil and image

1992-04-21

1994-06-28

Henry, Jon W.

Optical: systems and elements

Prism

With reflecting surface

359727, 359636, 359351, 359861, G02B 504, G02B 2710, G01J 548, G01J 554

Patent

active

053252373

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: 1836562 (1931-12-01), Waide

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