Title :
Facet-ensemble method for wave scattering from rough surface
Author :
Ro, R. ; Varadan, V.V. ; Ma, Y. ; Varadan, V.K.
Author_Institution :
Center for the Eng. of Electron. & Acoustic Mater., Pennsylvania State Univ., University Park, PA, USA
Abstract :
The scattering of electromagnetic and acoustic waves by rough surfaces is studied when either the Dirichlet or the Neumann boundary condition prevails. The facet-ensemble method is used to compute the field scattered by rough surfaces. In this method, the scattering surfaces are modeled by an ensemble of flat facets and, consequently, the scattered field is expressed as a sum of specularly reflected and diffracted fields. The reflected field can be calculated by applying the laws of reflection and refraction. The uniform theory of diffraction (UTD) is used to solve the diffracted field from convex wedges on the surface. The surface models examined are periodic in one instance and random Gaussian in the other. The comparison between results from the facet-ensemble method and experimental data is good for both types of surfaces
Keywords :
acoustic wave scattering; electromagnetic wave scattering; Dirichlet boundary condition; EM wave scattering; Neumann boundary condition; UTD; acoustic wave scattering; convex wedges; facet-ensemble method; flat facets; periodic models; random Gaussian models; rough surface; scattering surfaces; specularly diffracted fields; specularly reflected fields; surface models; uniform theory of diffraction; Acoustic scattering; Acoustic waves; Boundary conditions; Diffraction; Electromagnetic scattering; Reflection; Rough surfaces; Surface acoustic waves; Surface roughness; Surface waves;
Conference_Titel :
Ultrasonics Symposium, 1988. Proceedings., IEEE 1988
Conference_Location :
Chicago, IL
DOI :
10.1109/ULTSYM.1988.49543
