Low irradiance sensor with iterative angular resolution...

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

G - Physics

01

S

G01S 7/495 (2006.01) F41H 11/02 (2006.01)

Patent

CA 2550032

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.

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