Method and apparatus for linearizing photoresistive optical sens

Details Method and apparatus for linearizing photoresistive optical sens Method and apparatus for linearizing photoresistive optical sens

1991-05-07

1993-06-08

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250239, 356225, H01J 314

Patent

active

052182010

ABSTRACT:
The linearity of a photoresistive device at varying levels of radiant signal is improved by masking the sensitive area of the photoresistive device so that only a portion of the sensitive area is illuminated. The masking prevents exposure of the entire surface area of the cell, which increases the dynamic range, allowing a more linear, small signal sensitivity over wide variations in brightness.

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patent: 3304435 (1967-02-01), Norwood
patent: 3370557 (1983-01-01), Axmark et al.
patent: 3476945 (1969-11-01), Golden et al.
patent: 3478663 (1969-11-01), Tsuruoka et al.
patent: 4410266 (1983-10-01), Seider
patent: 4701624 (1987-10-01), Kern et al.

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