Optics: measuring and testing – By polarized light examination
Patent
1993-07-14
1995-04-04
Hellner, Mark
Optics: measuring and testing
By polarized light examination
359371, 359407, 359501, 250330, 250342, G01J 400, G02F 101
Patent
active
054042259
ABSTRACT:
A device will assist in detecting man-made objects by using a liquid crystal retarder and a stationary polarizer. The liquid crystal retarder shifts impinging light 90 degrees between a nonrotated and a rotated mode. In the nonrotated mode, the retarder is essentially transparent, with the light passing through the retarder and through the polarizer. In the rotated mode, the impinging light will be rotated 90 degrees. An observer viewing the light passing through the polarizer will detect a difference or a flashing, with the rate depending upon the speed of oscillation between the rotated and nonrotated modes. The system can be employed with visible light optical systems such as binoculars, or with an infrared detector or video camera.
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patent: 5138162 (1992-08-01), Hacskaylo
patent: 5264916 (1993-11-01), Bushman
"Polarization Optics Catalog & Handbook", 1992 (pp. 10-15).
"NASA Tech Briefs", May, 1993, vol. 17, No. 5 (p. 52).
"Technical Support Package", Device for Perception of Polarization, MSC-21915.
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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