Patent ID: 7385698
Filing Date: 2008-06-10
Classification: G01N

Abstract:
1. A method of selectively monitoring frontside or backside reflections from a sample, comprising the steps of: a) providing a system which is sequentially comprised of a source of electromagnetic radiation, a sample having a frontside and a backside, and a detector; said source, sample and detector being oriented such that electromagnetic radiation from said source is directed at said sample at an oblique angle, reflects therefrom and enters said detector, said detector being of a small dimension as compared to the spread between sample frontside and sample backside reflections at the location thereof, said detector being mounted to allow movement into electromagnetic radiation reflected from the frontside or backside; b) causing a beam of electromagnetic radiation to reflect from said sample; and c) moving said detector into electromagnetic radiation reflected from the sample frontside or from the sample backside and obtaining data and acquiring data.