Interference suppression for imaging optical systems

Details Interference suppression for imaging optical systems Interference suppression for imaging optical systems

1978-07-19

1980-11-11

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250216, G01J 120

Patent

active

042335019

ABSTRACT:
Apparatus for sun-interference suppression in optical imaging systems reduces the light flux density in the image of the sun in comparison to the light flux density of the scene image, thereby reducing the area of the scene image that is dominated by the sun. An illustrative reduction of 27:1 of the light flux density of the image of the sun compared to the light flux density of the image of the scene is accomplished by three filters formed of photochromic material positioned along the optical axis of the sun-interferences suppression apparatus behind an image-forming lens. The lens focuses the sunlight into a converging cone; the convergence of the cone of sunlight between photochromic filters provides intensification which enhances the darkening of subsequent photochromic filters. The positioning of the photochromic filters allows only the scene image within two (2) degrees of the center of the sun to be affected by the darkened photochromic glass.

REFERENCES:
patent: 3204100 (1965-08-01), Wormser et al.
patent: 3418478 (1968-12-01), Falbel

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