Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1975-07-24
1977-08-16
Buczinski, S. C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250203R, 350172, 356 5, 356 28, H01J 314, G01C 308, G01C 336
Patent
active
040428222
ABSTRACT:
A laser beam is expanded by means of a beam expander device, the expanded beam striking the surface of a mirror which has an aperture formed therein. A portion of the beam passes through the aperture and is focused so that it strikes an optical detector. The major portion of the beam is reflected from the mirror surface to a scanner mirror which provides a transmitter beam to scan targets to be detected. A beam received back from the targets also strikes the scanner mirror and is reflected by this scanner mirror to a corner reflector, the beam being displaced a predetermined amount by the corner reflector and reflected therefrom in a direction precisely opposite to that of the beam incident on the corner reflector. This beam, after being reflected by the corner reflector, strikes a reflective surface of th apertured mirror directly opposite to that on which the laser beam is incident. The received beam is reflected by the mirror in precise alignment with the laser beam passing through the mirror aperture such that the wave fronts of the two beams are parallel, the second beam being focused so that substantially all of its energy strikes the optical detector. The received energy is thus mixed with the laser beam energy passed through the aperture to provide heterodyne detection of the received target signals.
REFERENCES:
patent: 3173019 (1965-03-01), Wormser
patent: 3409369 (1968-11-01), Bickel
patent: 3542472 (1970-11-01), Vaniz
patent: 3644043 (1972-02-01), Jones et al.
patent: 3836256 (1974-09-01), Peters
patent: 3900260 (1975-08-01), Wendt
Brandewie Richard A.
Davis Walter C.
Macken John A.
Buczinski S. C.
Hamann H. Fredrick
Pitts Rolf M.
Rockwell International Corporation
Sokolski Edward A.
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