Patent ID: 6762846
Filing Date: 2004-07-13
Classification: G01B

Abstract:
A method comprising:adjusting the focus of a metrology tool to focus on the surface of a substrate at least at three measurement points; determining the height of said surface of said substrate at each of said measurement points based on the amount of adjustment necessary to focus said metrology tool on said surface; and calculating the radius of curvature between three measurements; wherein calculating the radius of curvature between three measurements points produces a pre-processed radius of curvature; processing said substrate; repeating the acts of adjusting the focus of a metrology tool to focus on the surface of a substrate at least at three measurement points, determining the height of said surface of said substrate at each of said measurement points based on the amount of adjustment necessary to focus said metrology tool on said surface, and calculating the radius of curvature between three measurements points to produce a post-processed radius of curvature; comparing said pre-processed radius of curvature with said post-processed radius of curvature to determine the difference in radius of curvature; and calculating the stress associated with said processing based on difference in radius of curvature.