Patent Document ID: 8875078
Application ID: 13537781
Patent Flag: 1

Claim One:
1. A method of generating a library of model diffraction patterns, each representing a diffraction pattern expected from a target structure defined by a set of parameters and having a first part and a second part, the first part comprising a scattering object, the method comprising: calculating, using a processing unit, a first scattering effect of the first part of the target structure defined by a set of first part parameters for a plurality of different sets of first part parameters; calculating, using the processing unit, a second scattering effect of the second part of the target structure defined by a set of second part parameters for a plurality of different sets of second part parameters; and combining, using a processing unit, results of the calculatings to calculate model diffraction patterns, wherein the results of the calculating a first scattering effect are stored as they are calculated, these stored results being subsequently combined with the results of the calculating a second scattering effect as the latter are calculated.