Accession Number : AD0651754

Title :   SIGNAL CORRELATIONS IN FORWARD SCATTERING BY TWO-COMPONENT RANDOM DISTRIBUTIONS,

Corporate Author : SYLVANIA ELECTRONIC SYSTEMS-WEST MOUNTAIN VIEW CALIF

Personal Author(s) : Burke,J. E. ; Kays,T. H. ; Kulp,J. L. ; Twersky,V.

Report Date : 24 MAR 1967

Pagination or Media Count : 65

Abstract : Experimental data and theory for the scattering of 5-mm microwaves by two-component, moving, random distributions are compared. The component scatterers of the distributions are styrofoam spheres with radii large compared to the wavelength and with relative indices of refraction close to unity; the motion of the spheres arises from turbulent air streams flowing through grids that form the top and bottom of a styrofoam container. The experimental results include the coherent phase, attenuation coefficient, and intensity, the incoherent intensity, the total intensity, as well as other quantities derived from raw data. The primary variable is the 'fractional volume', i.e., the fraction of significant space taken up by scattering material, which is determined by the number of spheres in the container. The data were obtained in real time by processing the instantaneous phase quadrature components of the scattered field with an electronic analog computer. The experimental data are shown to be in good agreement with existing theory. Preliminary results of digitally processing tape recordings of instantaneous signals are given for a dynamic distribution of four hundred identical spheres. The digital results are compared with corresponding analog-computer data. (Author)

Descriptors :   (*MICROWAVES, SCATTERING), THEORY, EXPERIMENTAL DATA, PROPAGATION, PHASE SHIFT CIRCUITS, ATTENUATION, INTENSITY, DISTRIBUTION FUNCTIONS, SPHERES, SIGNALS

Subject Categories : Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE