Exact Calculations of First Order Contributions to the Incoherent Intensity.
PENNSYLVANIA STATE UNIV UNIVERSITY PARK LAB FOR ELECTROMAGNETIC AND ACOUSTIC RESEARCH
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Basic studies on the effect of inhomogeneities - via their geometry, size, material properties, distribution, multiple, scattering processes and statistical correlations in position and the effect of aligned versus randomly oriented non-spherical scatterers has continued this year. Emphasis has been on studies of the second moment of the field fluctuation, namely the incoherent intensity. The effects of completely correlated identical scatterers versus partially correlated scatterers distinct has been studied as a function of observation angle, non-dimensional wavenumber, and concentration. Due to the specific form of the expressions for the incoherent intensity, the effect of correlations is to decrease the value of the incoherent intensity, the effect of correlations is to decrease the value of the incoherent intensity. Since the correlation contribution is also very much angle dependent, the effects are more in some direction than in others. In every case both vertical and horizontal polarizations are studied and the differences in the results are discussed. The multiple amplitudes of the effective field exciting each scatterer are explicitily calculated leading to more accurate values of the second moment. It may be recalled that the effective field and the effective propagation constant are calculated in the Quasi Crystalline approximation and include the effects of pair correlation and sequential multiple scattering terms. Author
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