Patent ID: 7298494
Filing Date: 2007-11-20
Classification: G01B,G03F

Abstract:
1. A method, comprising: obtaining a plurality of low coherence interference signals from a measurement object comprising first and second interfaces, each low coherence interference signal comprising first and second overlapping interference patterns, each first interference pattern resulting from a different point of the first interface, each second interference pattern resulting from a different point of the second interface, the obtaining a plurality of low coherence interference signals comprising imaging the object; identifying a subset of each of the interference signals, each subset having a greater contribution from one of the first and second interference patterns of the corresponding interference signal than the other interference pattern; determining a spatial property of each of at least some of the points of the first or second interfaces based on an asymmetric subset of the overlapping interference patterns of the corresponding interference signal; and outputting information about the determined spatial properties.