Patent ID: 6922236
Filing Date: 2005-07-26
Classification: G01N

Abstract:
1. A system configured to inspect a specimen during use, comprising: an illumination system configured to direct a first beam of light to a surface of the specimen at an oblique angle of incidence during use and to direct a second beam of light to the surface of the specimen at a substantially normal angle during use, wherein an intersity of the second beam of light is substantially less than an intensity of the first beam of light, and wherein the illumination system comprises: a collection system configured to collect at least a portion of the first beam of light returned from the surface of the specimen during use and to collect at least a portion of the second beam of light returned from the surface of the specimen during use; and a detection system configured to process the collected portions of the first and second beams of light such that a presence of defects on the specimen can be detected from the collected portions of the first and second beams of light.