Patent ID: 7654007
Filing Date: 2010-02-02
Classification: G01B

Abstract:
1. A method for improving the reproducibility of a coordinate measuring machine and its accuracy, comprising the steps: defining at least one measuring field relative to an imaging field of a camera; imaging at least a first image at a position of the at least one structure on a substrate with the at least one measuring field of the camera, wherein the substrate is placed on a measuring stage traversable in the X coordinate direction and the Y coordinate direction, the position of the measuring stage being determined during imaging using a displacement measuring system; determining the position and/or width of the structure on the substrate using the measured position of the measuring stage and the first image recorded by the measuring field; determining a deviation between the position of the measuring stage at the first recording of a first image and a further position of the measuring stage for an envisaged recording of at least one second image of the same structure, prior to recording the second image; and displacing by the amount of deviation, the measuring field for recording the at least one second image of the structure and for evaluating the recording with respect to the position and/or width of the structure on the substrate, so that a measuring window is positioned at the same position of the structure as that during recording of the first image of this structure.