Image detector with reduced parasitic light

Details Image detector with reduced parasitic light Image detector with reduced parasitic light

1992-10-29

1994-04-12

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

257434, H01J 314

Patent

active

053028180

ABSTRACT:
An image detector includes a surface sensitive to photon radiation which is protected from the external environment by a transport window with an internal diopter and an external diopter which is integral with a housing and is placed in front of the sensitive surface. In order to eliminate the phenomenum known as "blooming" due to parasitic reflections causes by intense radiation, the window is formed by a transparent, nondiffusing medium which attenuates photon radiation, with the internal diopter of the window being at a distance from the sensitive surface which is smaller than or at most equal to several times the resolution distance of the detector. Additionally, the external diopter is sufficiently far removed from the sensitive surface such that the first reflection of the radiation coming from a source of maximum radiation will have a level, on the sensitive surface, which is lower than that of the direct radiation coming from a source of minimum radiation which is to be detected.

REFERENCES:
patent: 4636631 (1987-01-01), Carpentier et al.
patent: 5149958 (1992-09-01), Hallenbeck et al.

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