Patent ID: 7659974
Filing Date: 2010-02-09
Classification: G01N,G06T,Y10T

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, and to scan a second radiation beam across a portion of the first surface of the object, wherein the radiation targeting assembly comprises a wedged folded mirror in the optical path between the first radiation source and the first surface, such that a first portion of a radiation beam from the radiation source reflects from a front surface of the mirror and a second portion of the radiation beam from the radiation source reflects from a rear surface of the mirror; 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; an illumination absorbing system to absorb at least a portion of the radiation generated by the first radiation source; a detector assembly coupled to the scattered radiation collecting assembly to generate a first signal from the first scattered radiation beam and 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; wherein a third portion of the radiation beam from the radiation source is internally reflected at the front surface of the reflected mirror and reflects from the rear surface of the mirror.