Low irradiance sensor with iterative angular resolution
US7414568B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 25, 2003 |
| Grant date | Aug 19, 2008 |
| Priority date | — |
| Expiry date | Feb 7, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S7/4804
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.