Radiant energy detection system for the angular location of a li

Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems

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250237R, 356152, G01J 120

Patent

active

041122941

ABSTRACT:
A radiant energy detection system which allows angular location in bearing and elevation by using a simple detector element and a static mask preferably formed by a PLZT strip between two intersecting polarizers. A control circuit operates the mask to provide a configuration having a transparent zone equal to n measurement quadrants (n being a whole number equal to 1, 2 or 3) and an opaque zone equal to the remaining 4-n quadrants, and to bring about four successive operating states which are distinguished one from the next by an angular displacement of .pi./2 radians around the optical axis. The control circuit operates further a switching circuit synchronously with the mask to connect the output of the detector successively to four reception channels each of which includes a high speed memory. A measuring circuit calculates the angular location from the four detected signal values stored in the memory.

REFERENCES:
patent: 3932039 (1976-01-01), Frey
patent: 3994600 (1976-11-01), Tarasevich et al.
patent: 4009393 (1977-02-01), Ashley et al.

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