Scattering of radiation by particle layers

Fahimian, E.J.

doi:10.2514/6.1968-30

Cited by 1 publication

(2 citation statements)

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“…4. [Values of/(6) at 1° intervals are also available. 11 ] The major difference observed between the values calculated from the Mie equation and the experimental measurements is in the amount of energy scattered in the interval 0-20°, though small differences occur in most of the other intervals. This will be discussed under Mathematical Model.…”

Section: Resultsmentioning

confidence: 94%

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Scattering of radiation by particle layers.

1968

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The angular distribution of radiation scattered by 3.49-ju poly vinyl toluene spheres closely packed in a monolayer is reported. Measurements at 4358, 5500, 8978, and 11,460 A indicate that an approximation of the intensity distribution, with the exception of a 20° cone in the direction of forward scatter, can be obtained by treating the spheres as independent Mie scatterers. Intensities within the range of angles in which diffraction provides the major contribution to scatter (approximately 0° to 20°) are found to be considerably lower than predicted from Mie theory. A method is presented for estimating this reduction in intensity. D /(e) Nomenclature particle diameter ratio of energy scattered between 0° and 0° to that incident on the projected area of a particle intensity parameter; so defined that, for an incident beam of unpolarized radiation of intensity I and divergence d&i, the energy rate 0(0) scattered per unit solid angle of divergence of the incident beam is given byJi(Q) = Bessel function of the first order PVT = abbreviation for polyvinyl toluene Qsca = scattering efficiency: ratio of the energy scattered by a particle to that incident on its projected area S = amplitude function; proportional to amplitude of scattered wave x = ratio of sphere circumference to wavelength X = wavelength of incident radiation 0 = angle Subscripts JL(| ) = polarized perpendicular (parallel) to the plane containing the incident and scattered beam

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Section: Resultsmentioning

confidence: 94%

“…Here the energies transmitted by a given thickness of PVT in different spheres are in phase and therefore tend to reinforce each other. 11 The treatment of this case by a modification of a method originally employed by Sethi 12 is to be published elsewhere.…”

Section: Mathematical Modelmentioning

confidence: 99%