Patent ID: 8907261
Filing Date: 2014-12-09
Classification: G01J,G01S

Abstract:
1. A method for identifying a laser beam incident angle using a mask having a K-shaped aperture, wherein the K-shaped aperture includes at least one vertical aperture and two angled apertures that extend to the top and/or bottom rows of pixels of a sensor, the method comprising: scanning the first row of pixels and the last row of pixels of the sensor; identifying two regions of activated pixels on either the last row or the first row of pixels of the sensor; determining a first offset of the vertical aperture along a first axis; determining the number of pixels between the two regions of activated pixels; determining a second offset along a second axis orthogonal to the first axis using the number of pixels between the two regions of activated pixels; and determining a first incident angle of the laser beam from the first offset and the second offset.