Patent ID: 9360308
Filing Date: 2016-06-07
CPC Classification: G01B,G01N

Claim Text:
1. A method for analyzing an object, the method comprising: measuring a first X-ray reflectivity from a substrate before formation of the object, measuring the first X-ray reflectivity including measuring a first X-ray reflectivity spectrum; forming the object on the substrate; measuring a second X-ray reflectivity from the substrate after the formation of the object, measuring the second X-ray reflectivity includes measuring a second X-ray reflectivity spectrum; generating a delta spectrum between the first and second X-ray reflectivity spectrums, the delta spectrum corresponding to a variation between the first and second X-ray reflectivities; transforming the variation using a fast-Fourier transform; and determining a thickness of the object based on the transformed variation.