Patent ID: 7286247
Filing Date: 2007-10-23
Classification: G01B,G03F,H01L

Abstract:
1. A method for assessing a measurement system under test (MSUT), the method comprising the steps of: (a) providing a substrate having a plurality of structures; (b) measuring a dimension of the plurality of structures using a reference measurement system (RMS) to generate a first data set, and calculating an RMS uncertainty (U (i) an RMS precision; (ii) an independently determined RMS total measurement uncertainty (TMU (c) measuring the dimension of the plurality of structures using the MSUT to generate a second data set, and calculating a precision of the MSUT from the second data set; (d) conducting a linear regression analysis of the first and second data sets to determine a corrected precision of the MSUT and a net residual error; (e) determining a total measurement uncertainty (TMU) for the MSUT by removing the RMS uncertainty (U (f) outputting the TMU to a system capable of optimizing the MSUT.