Patent ID: 7345761
Filing Date: 2008-03-18
Classification: G01B,G01N

Abstract:
1. A method of determining actual properties of layered media, the method comprising the steps of: directing an incident beam of light towards the layered media, such that the incident beam of light is reflected from the layered media as a reflected beam of light, measuring actual properties of the reflected beam of light, estimating properties of the layered media, solving a mathematical model of the layered media with the estimated properties of the layered media to yield theoretical properties of the reflected beam of light, where the mathematical model is solved using at least one of a modified T matrix algorithm and a Z matrix algorithm, comparing the theoretical properties of the reflected beam of light to the actual properties of the reflected beam of light to yield a cost function, iteratively adjusting the estimated properties of the layered media and solving the mathematical model until the cost function is within a desired tolerance, and reporting the estimated properties of the layered media as the actual properties of the layered media.