Patent ID: 7046352
Filing Date: 2006-05-16
Classification: G01N,G03F,G06T

Abstract:
1. A surface inspection method for detecting defects in a substrate, the method comprising: generating a reference cluster by measuring summed light intensity values for light reflected by the substrate and for light transmitted through the substrate and mapping the measured summed light intensity values onto a coordinate system wherein mapping the measured summed light intensity values onto a coordinate system comprises mapping the measured summed light intensity values onto a two-axis coordinate system and wherein the reference cluster comprises a two-dimensional reference area, wherein a first axis is defined by at least one of the measured summed light intensity values or values related to the measured summed light intensity values, and a second axis is defined by values derived from a model of substrate optical performance; comparing measured summed light intensity values with the reference cluster; and determining whether the measured summed light intensity values for the substrate are representative of a defect of the substrate.