Optics: measuring and testing – By polarized light examination
Patent
1993-07-05
1995-09-19
Hellner, Mark
Optics: measuring and testing
By polarized light examination
359371, 359407, 359501, 250330, 250342, G01J 0400
Patent
active
054520894
ABSTRACT:
A search light employs variable polarization angles to enhance target identification. The search light shines a beam of light which may be directed across terrain. The beam of light is alternated in polarization angles at a rate of about five to twelve cycles per second. The alternating contrast in polarization angles produces flashing to an observer viewing certain targets struck by the beam of light. The flashing appears when striking man-made objects which tend to have a differential in polarized light between horizontal and vertical polarization. Natural objects do not appear to provide the flashing to the observer. The rotating polarization angles are accomplished in one instance by using a stationary polarizer and a liquid crystal retarder mounted in front of a light source. In another instance, the change in polarization angles is accomplished by rotating a polarizer in front of a light source. The light source may be infrared, visible or ultraviolet.
REFERENCES:
patent: 2165974 (1939-07-01), Land
patent: 3192825 (1965-07-01), Courtney-Pratt et al.
patent: 3633212 (1972-01-01), Cooper
patent: 4202601 (1980-05-01), Burbo et al.
patent: 4515443 (1985-05-01), Bly
patent: 4601552 (1986-07-01), Jessmore
patent: 4763361 (1988-08-01), Honeycutt et al.
patent: 5138162 (1992-08-01), Hacskaylo
patent: 5264916 (1993-11-01), Bushman
"Polarization Optics Catalog & Handbook", 1992 (p. 10-15).
"NASA Tech Briefs", May, 1993 vol. 17 No. 5 (p. 52).
"Technical Support Package, Device for Perception of Polarization", MSC-21915.
AI S. N. 07/863,883, filed Apr. 6, 1992, Victor S. Whitehead and Kinsel Coulson.
Bradley James E.
Hellner Mark
Lockheed Corporation
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