Patent ID: 8928894
Filing Date: 2015-01-06
Classification: G01B

Abstract:
1. A method for optically monitoring an object, arranged on a substrate, within a monitoring area, comprising: transmitting light rays with a light transmitting unit that form a line of light on the object; imaging the line of light as reflected from the object on an array of receiving elements that detects the reflected line of light and produces receiving element signals that correspond to measuring points on the object; and evaluating the receiving element signals to structure a distance profile of the object using a triangulation principle, the evaluating including generating at least one evaluation window which covers in a first direction a local region extending along the line of light and in a second direction a distance range, and using the measuring points located farthest outside within the evaluation window for a left limit point and a right limit point for determining object data, wherein the generating at least one evaluation window includes: defining a preceding evaluation window into which only the object, but not the substrate, extends with at least one edge; determining the left limit point and the right limit point for the preceding evaluation window to determine the position of at least one edge of the object; and defining, in dependence on a measuring value corresponding to one of the determined left or right limit points for the preceding evaluation window, at least one further evaluation window wherein only one measuring point corresponding to either a left limit point or a right limit point of the at least one subsequent window, is located on the object while the other limit point in the at least one further window is located on the substrate, and determining the height of the object from the left limit point and the right limit point of the at least one further evaluation window.