Physical optics and rigid/soft approximations to forward scattering by elastic shells

Jacob George

doi:10.1117/12.60557

1 July 1992 Physical optics and rigid/soft approximations to forward scattering by elastic shells

Jacob George

Proceedings Volume 1702, Hybrid Image and Signal Processing III; (1992) https://doi.org/10.1117/12.60557
Event: Aerospace Sensing, 1992, Orlando, FL, United States

Abstract

Our numerical results demonstrate that both Fraunhofer and Fresnel diffractions provide good approximations to forward scattering by elastic spherical shells and rigid/soft spheres, for nondimensional frequency values 20 < ka < 80, and scattering angles 0 degree(s) < 0 < 10 degree(s). There are only small differences among the Fraunhofer, Fresnel, and rigid/soft predictions for differential scattering cross sections. They arise mainly from the slightly varying degrees of compression (in angular space) of one pattern relative to another. The magnitudes of the maximums predicted by the four methods are in good agreement, but the minimums do not agree. Calculations for 1%, 5%, and 10% spherical steel shells indicate that variation of shell thickness has only a small effect on forward scattering.

Citation Download Citation

Jacob George "Physical optics and rigid/soft approximations to forward scattering by elastic shells", Proc. SPIE 1702, Hybrid Image and Signal Processing III, (1 July 1992); https://doi.org/10.1117/12.60557

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