Television – Camera – system and detail – Optics
Reexamination Certificate
2005-04-20
2009-08-18
Ho, Tuan V (Department: 2622)
Television
Camera, system and detail
Optics
C250S352000, C250S353000
Reexamination Certificate
active
07576791
ABSTRACT:
The invention applies wavefront coding to the front of an electro-optic/infrared device to minimize the amount of light which is retroreflected by systems, such as Fowarding Looking Infrared systems, back to its source. The invention (unlike conventional reduction methods) does not rely on reducing the laser power leaving the interrogated sensor, but primarily on controlling its direction. A sensor according to the present invention, which has been wavefront coded for reduction of reflected light, will also effect the direction of the scattered light, thereby significantly reducing that which returns to the zero bistatic angle position. In contrast, a limitation of conventional methods is that once specular reflections are addressed, the remaining retroreflected signal typically results from scattered light at the focal plane which is largely collected and recollimated by the system optics.
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Ho Tuan V
Kim Richard J.
Raubitschek John H.
The United States of America as represented by the Secretary of
Wang Kent
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