Patent ID: 8501501
Filing Date: 2013-08-06
Classification: G01B

Abstract:
1. An apparatus comprising: a light source that generates light that is incident on a sample, the sample having a first structure and a second structure; a detector that receives the light after the light is incident on the sample; a processor coupled to receive a signal from the detector, the processor is configured to generate a first model of the sample, wherein the first model models the first structure with at least one independent variable; generate a second model of the sample, wherein the second model models the second structure with at least one independent variable, wherein at least one parameter in the first model and at least one parameter of the second model are linked, and the signal from the detector, the first model and the second model with the at least one parameter that is linked together to determine at least one desired parameter of the sample; and report the determined at least one desired parameter of the sample.