Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1976-03-23
1978-05-23
Smith, Alfred E.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
350150, G02F 101, H01J 3912
Patent
active
040912795
ABSTRACT:
Equalization and the individual control of the sensitivity of each element in a multi-element sensor array is achieved by means of a light transmitting element positioned to intercept light falling on the light receiving surface of each sensor element. Structurally the light transmitting device can be a single sheet of transparent ferroelectric ceramic having a long term polarization retention capability (or memory). A discrete portion of the sheet adjacent each sensor element is polarized in a manner that controls the level of light transmitted through the sheet at that locus and so controls the output level of the sensor adjacent to it. Equalization of sensor elements is accomplished by setting the polarization of each light transmitting element as a function of the difference between its associated sensor output voltage level and a standard voltage level in response to a constant intensity light source.
REFERENCES:
patent: 3612656 (1969-06-01), Maldonado et al.
patent: 3680060 (1972-07-01), Keneman et al.
patent: 3926520 (1975-12-01), Kaufman
Matthews, Jr. Willard R.
Moore David K.
Rusz Joseph E.
Smith Alfred E.
The United States of America as represented by the Secretary of
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