Patent ID: 6201601
Filing Date: 2001-03-13
Classification: G01J,G01N

Abstract:
An optical system for detecting anomalies of a sample, comprising:first optics directing a first beam of radiation along a first path onto a first spot on a surface of the sample;second optics directing a second beam of radiation along a second path onto a second spot on a surface of the sample, said first and second paths being at different angles of incidence to said surface of the sample;a first detector;collection optics including a curved mirrored surface receiving scattered radiation from the first or the second spot on the sample surface and originating from the first or second beam and focusing the scattered radiation to said first detector, said first detector providing a single output value in response to the radiation focused onto it by said curved mirrored surface; andan instrument causing relative motion between the two beams and the sample so that the spots are scanned across the surface of the sample.