Accession Number : AD0256969

Title :   BRIGHT AND DARK RINGS

Corporate Author : AVCO CORP WILMINGTON MASS RESEARCH AND ADVANCED DEVELOPMENT DIV

Personal Author(s) : PENNDORF,RUDOLF B.

Report Date : MAR 1961

Pagination or Media Count : 1

Abstract : The scattering diagrams of spherical aerosols possess maxima and minima, which can be interpreted as sequences of bright and dark rings. These rings are investigated for eta equals 1.10, 1.20, 1.30, 1.33, 1.40, 1.44, and 1.50. The results show a systematic behavior exists for the appearance of these rings, such as the number of rings and their regular shift in angular positionAS FUNCTION OF THE SIZE PARAMETER, ALPHA. For the intensity function i1, the rings due to diffraction move with increasing size parameter into the forward scattering area, whereas those caused by refraction and reflection within the sphere stay in the backward scattering area. The rings appear first in the backward area as long as the size parameter is small, but from rho exceeds 4 (rho equals normalized size parameter) on they begin to appear at 80 to 90 degrees; i.e., in the right-angle scattering area. For the intensity function i2, however, the systematic behavior is poor and ill-defined. Nevertheless, some of the basic features are similar to those for i1. Finally, a system similar to i1 exists for the angular Mie scattering coefficient i sub theta. In the last case, data are given for eta equals 1.33 only. (Author)

Descriptors :   *LIGHT, *OPTICS, AEROSOLS, OPTICAL ANALYSIS, PARTICLES, PHYSICAL PROPERTIES, REFRACTION, REFRACTIVE INDEX, SCATTERING

Distribution Statement : APPROVED FOR PUBLIC RELEASE