Patent ID: 8134698
Filing Date: 2012-03-13
Classification: G01N

Abstract:
1. A system to analyze a surface of an object, comprising: a first radiation source; a radiation targeting assembly to scan a first radiation beam from the first radiation source across a portion of a first surface of the object, wherein the first radiation beam impinges the first surface at a first intensity and a to scan a second radiation beam across a portion of the first surface of the object, wherein the second radiation beam impinges the first surface proximate the first beam and at a second intensity, greater than the first intensity; a scattered radiation collecting assembly to collect portions of a first scattered radiation beam scattered from the first surface, wherein the first scattered radiation beam results from a reflection of the first radiation beam, and to collect portions of a second scattered radiation beam scattered from the first surface, wherein the second scattered radiation beam results from a reflection of the second radiation beam; a detector assembly coupled to the scattered radiation collecting assembly to generate a first signal from the first scattered radiation beam rand a second signal from the second scattered radiation beam; a signal processing module to generate a data set from the first signal and the second signal as the first radiation beam and the second radiation beam scan a portion of the surface of the object; and a data processing module to use data in the data set to evaluate defects in the surface of the object.