SCATTERING FROM SURFACES WITH DIFFERENT ROUGHNESS SCALES: ANALYSIS AND INTERPRETATION
BATTELLE MEMORIAL INST COLUMBUS OH COLUMBUS LABS
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The report discusses several approaches to scattering from slightly rough, very rough, composite, and rough spherical surfaces. Average incoherent scattering cross sections for slightly rough surfaces are obtained using a perturbation technique for a perfect conductor and for a surface material which is homogeneous. Three optics techniques are presented which yield scattering cross sections for very rough surfaces, and it is shown that all give the same solution for Gaussian surfaces. Composite surfaces, i.e. ones consisting of both slightly rough and very rough structures together, are analyzed, and a heuristic physical derivation of their scattering cross section is presented. Average backscattering cross sections for rough spherical surfaces also are presented. Both the coherent and incoherent cross sections are given for slightly rough and very rough spheres. Physical interpretation of the scattering mechanism is emphasized.
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