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United States Patent | 8,063,348 |
Swaminathan , et al. | November 22, 2011 |
A system for detection of optical type devices being used by an enemy sniper subject without alerting the enemy is shown. A coherent laser beam of a wave length in the visible color range, is sent along an axis and passing through a beam splitter device. A detection means is arranged to generate a signal when it detects retro-reflections from the target optical devices or subject including clutter reflections in a 180 degree direction relative to axis. The detection means is coaxially mounted with the source of illumination with a second detection means off axis therefrom to generate a second detection signal when it detects clutter reflections from the target optical devices or subject. A comparator means forms a difference signal between the retro-reflected detection signal and the second detection signal and indicates when the difference signal exceeds a predetermined threshold.
Inventors: | Swaminathan; Venkataraman (Bridgewater, NJ), Willson; Paul D. (Rockaway, NJ), Bupathi; Deepak (East Brunswick, NJ) |
---|---|
Assignee: |
The United States of America as represented by the Secretary of the Army
(Washington,
DC)
|
Family ID: | 44936792 |
Appl. No.: | 12/476,581 |
Filed: | June 2, 2009 |
Current U.S. Class: | 250/203.1; 250/221 |
Current CPC Class: | G01S 7/4802 (20130101); G01S 17/026 (20130101) |
Current International Class: | G01C 21/02 (20060101); G06M 7/00 (20060101) |
Field of Search: | ;250/221,203.1,559.29-559.32,206.1,206.2,214R ;356/3.01-3.03,3.08,3.1-3.12,4.01,152.3 ;348/135,139,140,142,169 ;396/89,153 ;434/16,17,21,22,19,11 ;235/404,414-416 ;345/555-557 ;463/51,52 |
6046799 | April 2000 | Lysen |
2010/0321668 | December 2010 | Ueno |
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