Abstract
The ray optical theory developed previously for scattering by discontinuities in wave guides is extended to the case where the wave-guide medium supports two wave species. Examples of such media are compressible plasmas with constituent electromagnetic and acoustic waves, elastic solids with compressional and shear waves, and others. After deriving the modal excitation coefficients due to a source with prescribed directive radiation pattern, these results are applied to reflection from a bifurcation discontinuity in a compressible-plasma wave guide. Modal reflection and coupling coefficients are computed by accounting for primary and multiple diffraction at the bifurcation edge. Numerical results, illustrating the effects of wave coupling, are explained in terms of fundamental ray optical scattering mechanisms.
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