Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1986-12-15
1988-04-26
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
356141, G01J 120, G01B 1126, G01C 100
Patent
active
047406771
ABSTRACT:
In an optically phased array of multiple laser telescopes, the phasing between the telescopes is accomplished by sampling adjacent outgoing wavefronts. The two samples of each wavefront are then combined to form an interference pattern on a camera. This image is then converted to digital signals, employing an error signal representative of the phase difference. It is necessary that the telescopes be pointing in the same direction. This is assured by having each telescope associated with an optical sensor which produces an X or Y tilt error. The X or Y tilt error is corrected by the optical component referred to as the optical path difference adjustor (OPDA). A signal processing circuit is disclosed which receives X and Y tilt error signals, as well as phase error signals, and produces therefrom drive signals which correct and drive the OPDA in an array of multiple laser telescopes.
REFERENCES:
patent: 4384198 (1983-05-01), Williamson
patent: 4639586 (1987-01-01), Fender et al.
patent: 4667090 (1987-05-01), Carreras et al.
patent: 4689758 (1987-08-01), Carreras
Baciak Mark G.
Carreras Richard A.
Coates Elinor L.
Jenks Morton
Auton William G.
Nelms David C.
Oen William L.
Singer Donald J.
The United States of America as represented by the Secretary of
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