Patent ID: 7154993
Filing Date: 2006-12-26
Classification: G01N,G06N

Abstract:
1. A method of determining parameters of a sample by X-ray scattering, the method comprising the steps of: a) exposing the sample to X-rays and measuring scattered X-ray intensity; b) generating a parameterized model of the sample, which is used for numerical simulation of scattered X-ray intensity on the basis of a physical scattering theory; c) comparing experimental and simulated X-ray scattering data to generate an error value; and d) modifying parameters of the model by means of a genetic algorithm involving a number of individuals each with an equal number N of encoded parameters forming a generation and applying genetic operators of “selection”, “crossover” and “mutation” used for composing successive generations of evolving individuals, wherein the genetic operator “mutation” is no longer applied in evolution of further generations after a given number k of successive generations.