Patent Document ID: 9116834
Application ID: 13417759
Patent Flag: 1

Claim One:
1. A method of inspecting a structure having materials of differing properties such as to cause at least one discontinuity in an electromagnetic field at a material boundary, comprising: detecting an electromagnetic scattering property of the structure illuminated by radiation; modeling an electromagnetic scattering property of the structure, wherein the modeling the electromagnetic scattering property of the structure comprises: numerically solving a volume integral equation for a contrast current density by determining components of the contrast current density by using a field-material interaction operator to operate on a continuous component of the electromagnetic field and a continuous component of a scaled electromagnetic flux density corresponding to the electromagnetic field, the scaled electromagnetic flux density being formed as a scaled sum of discontinuous components of the electromagnetic field and of the contrast current density, and calculating a modeled electromagnetic scattering property of the structure using the determined components of the contrast current density; comparing the detected electromagnetic scattering property of the structure to the modeled electromagnetic scattering property; and determining a structural parameter of the structure based on the comparison of the detected electromagnetic scattering property of the structure to the modeled electromagnetic scattering property.