Low irradiance sensor with iterative angular resolution

Details Low irradiance sensor with iterative angular resolution Low irradiance sensor with iterative angular resolution

2003-03-25

2008-08-19

Hellner, Mark (Department: 3663)

Communications: directive radio wave systems and devices (e.g.,

Radar transponder system

Iff or sif

C398S039000

Reexamination Certificate

active

07414568

ABSTRACT:
A laser warning receiver (LWR) to detect a very low power laser beam for a laser beam rider and provide a high angular resolution in determining the angle-of-arrival of that beam. An aperture having a fixed field-of-view (FOV) is located in a detection channel followed by a narrow-band filter and a detector whose output is applied to a pulse analyzer circuit. A localization channel with the same FOV has a similar narrow-band filter and a lens to focus light from that FOV onto a detector through a N×M element LCD matrix, an output of that detector being applied to the pulse analyzer circuit whose output is applied to a LCD pattern selector connected to the matrix which controls elements in the matrix to provide a transparent window of variable size and position. The size and position of that window allows a laser beam to reach the detector, the window being iterative reduced in size when a beam is detected to provide the location of its source.

REFERENCES:
patent: 4630049 (1986-12-01), Callahan, Jr.
patent: 5142288 (1992-08-01), Cleveland
patent: 5280167 (1994-01-01), Dubois
patent: 6433330 (2002-08-01), Dubois
patent: 6770865 (2004-08-01), Wootton et al.
patent: 001160549 (2001-12-01), None

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