Patent ID: 7881891
Filing Date: 2011-02-01
Classification: G05B,Y02P

Abstract:
1. A system, comprising: a processor; and a memory, including a program executable by the processor, the program including: a system for collecting historical metrology data from a metrology tool; and a reduction analysis system that generates and stores an optimized reduced data set for use during a metrology operation by comparing an initial capability calculated from an entire set of historical metrology data with a recalculated capability for a reduced data set to determine if the initial capability and recalculated capability will provide substantially the same process capability result, wherein the reduced data set is obtained by removing a subset of data from the historical metrology data, wherein the historical metrology data comprises data collected for individual wafers contained within a cassette, and wherein the subset of data comprises data for a wafer at a predetermined position within each cassette.