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Saturday, July 18, 2020 | History

3 edition of Single scattering from nonspherical Chebyshev particles found in the catalog.

Single scattering from nonspherical Chebyshev particles

Single scattering from nonspherical Chebyshev particles

a compendium of calculations

  • 215 Want to read
  • 24 Currently reading

Published by National Aeronautics and Space Administration, Scientific and Technical Information Branch, For sale by the National Technical Information Service] in [Washington, DC], [Springfield, Va .
Written in English

    Subjects:
  • Light -- Scattering,
  • Aerosols -- Measurement

  • Edition Notes

    StatementWarren J. Wiscombe, Alberto Mugnai
    SeriesNASA reference publication -- 1157, NASA reference publication -- 1157
    ContributionsMugnai, Alberto, United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch
    The Physical Object
    FormatMicroform
    Pagination1 v
    ID Numbers
    Open LibraryOL14654365M

    [14] Wiscombe WJ, Mugnai A. Single scattering from nonspherical Chebyshev particles: a compendium of calculations. Washington, DC: National Aeronautics and Space Administration; [15] Barber PW, Hill SC. Light scattering by particles: computational methods. Singapore: World Scienti c; [16] Chew WC. Waves and elds in inhomogeneous media. T-matrix computations for particles this large can be used to investigate the range of applicability of the geometric optics approximation ' in computing light scattering by nonspherical particles So far, direct comparisons of rigorous and ray tracing computations have been reported only for perfect spheres3 and infinite circular cylinders.8 Cited by:

      Scattering from nonspherical Chebyshev particles. 3: Variability in angular scattering patterns. Mugnai A, Wiscombe WJ. We study shape-induced variability in the scattered intensity from randomly oriented nonspherical particles. Up to 21 different Chebyshev shapes contribute to defining a shape-induced standard deviation about each of the mean Cited by:   The regular T-matrix codes are applicable to rotationally symmetric particles with equivalent-sphere size parameters exceeding At present, the T-matrix method is the fastest exact technique for the computation of nonspherical scattering based on a direct solution of Maxwell's T-matrix codes are orders of magnitude faster than those based on the DDA, VIEF, .

    Lidar measurements are often interpreted on the basis of two fundamental assumptions: absence of multiple scattering and sphericity of the particles that make up the diffusing medium. There are situations in which neither holds true. We focus our interest on multiply-scattered returns from homogeneous layers of monodisperse, randomly oriented, axisymmetric nonspherical particles. T2 Chebyshev. Nonspherical particles are abundant in natural and artificial environments ().Furthermore, it has become universally recognized that nonsphericity (or more generally, complex morphology) of particles has a profound effect on their scattering and absorption our knowledge and understanding of how nonspherical particles scatter and absorb electromagnetic energy remains incomplete Cited by:


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Single scattering from nonspherical Chebyshev particles Download PDF EPUB FB2

Get this from a library. Single scattering from nonspherical Chebyshev particles: a compendium of calculations. [Warren J Wiscombe; Alberto Mugnai]. In this paper, we study the behavior of the scattering efficiency Qsca, the absorption efficiency Qabs, the Single scattering from nonspherical Chebyshev particles book albedo ω, the asymmetry factor g, and the backscattered fraction for isotropically incident radiation β̅ for randomly oriented rotationally symmetric nonspherical particles of radii r = r0[1 + ∊Tn(cosθs)], where Tn is a Chebyshev polynomial of order n.

The Mie theory, however, is a poor approximation for the scattering properties of irregular particles at large scattering angles and for backscatter. Volumes have already been printed by Springer. The volume is composed of several papers (usually, 10) of leading researchers in the respective field.

The main focus of this book is light scattering, radiative transfer and optics of snow. Category: Science. Single scattering from nonspherical Chebyshev particles: A compendium of calculations - NASA/ADS A large set of exact calculations of the scattering from a class of nonspherical particles known as Chebyshev particles' has been performed.

A large set of exact calculations of the scattering from a class of nonspherical particles known as Chebyshev particles' has been performed. Phase function and degree of polarization in random.

Shape-induced variability in the scattered intensity from randomly oriented nonspherical particles is studied. A comparison is made between bands of shape-induced variability for six size intervals within the size parameter range of 1 to 20 and corresponding spherical intensities.

It is found that averaging spherical intensities over narrow size ranges produces effects that are qualitatively Cited by: The calculated angular scattering properties of over randomly oriented nonspherical Chebyshev particles are examined for the effect of three factors: size; concavity vs convexity; and amount of deformation from a sphere.

The scattering efficiency was somewhat larger for nonspherical particles, while the single-scattering albedo tended to be smaller, and concavity was shown to almost always enhance spherical-nonspherical differences.

We study shape-induced variability in the scattered intensity from randomly oriented nonspherical particles.

Up to 21 different Chebyshev shapes contribute to defining a shape-induced standard deviation about each of the mean nonspherical intensity vs angle curves shown in part 2 of this series. Bands of shape-induced variability (defined as plus and minus one standard deviation) for six size Cited by: The book opens with a foreword by the renowned H C van de Hulst, who provides an interesting historical review and perspective.

An introductory section of three chapters follows, dealing with fundamental concepts and definitions. The first of these deals with scattering by single particles and moves on to multiple scattering and radiative transfer.

Get this from a library. Single scattering from nonspherical Chebyshev particles: a compendium of calculations. [Warren J Wiscombe; Alberto Mugnai; United States. National Aeronautics and Space Administration.

Scientific and Technical Information Branch.]. calculation light scattering characteristics of nonspherical particles.

The general approach to the form-factor of compound particles in the RGD approximation is discussed. Comparison of scattering calculations for aggregated particles based on different models U. Comberg and T. Wriedt Convergence of the T-matrix approach for randomly oriented, nonabsorbing, nonspherical Chebyshev particles J.

Ding and L. Xu Projection schemes in the null field method A. Doicu, Yu. Eremin, and T. Wriedt Light scattering by nonspherical particles in the RGD approximation: Single scattering.

This book is devoted applications of the Rayleigh-Gans-Debye (RGD) approximation to the calculation light scattering characteristics of nonspherical particles. The general approach to the form-factor of compound particles in the RGD approximation is : Konstantin Shapovalov.

deals with Rayleigh molecular scattering, Section summarizes the theory of scatter-ing by spherical particles (the Lorenz Mie theory), and Section addresses the scattering by nonspherical particles.

Finally, in Sectionwe discuss the main traits of single-scat. (a) Far-field electromagnetic scattering by an individual particle in the form of a single body or a fixed cluster.

(b) Far-field scattering by a small volume element composed of randomly positioned, widely separated par- ticles. (c) Multiple scattering by a layer of randomly and sparsely distributed particles. Light scattering on Chebyshev particles of higher order Article (PDF Available) in Applied Optics 45(23) September with Reads How we measure 'reads'.

Scattering properties of this two parameter family of particles have been studied extensively in the field of light scattering. Some of the Chebyshev particles at fixed volume are shown in figure 3 for and figure 4 for.

The particles are symmetric with respect to the Z axis (see figure 3(a)).Cited by: 7. In this study, we model single-scattering properties of small cirrus crystals using mixtures of polydisperse, randomly oriented spheroids and cylinders with varying aspect ratios and with a refractive index representative of water ice at a wavelength of by:.

This book gives a detailed overview of the theory of electromagnetic wave scattering on single, homogeneous, but nonspherical particles. Beside the systematically developed Green’s function formalism of the first edition this second and enlarged edition contains additional material regarding group theoretical considerations for nonspherical particles with boundary symmetries, an iterative T.for distinguishing between spherical and nonspherical particles are discussed.

Mea- surements were performed at scattering angles of 40,55, 90 and " to investigate the most appropriate scattering angle for our apparatus.

Because we found 55" to be a good compromise between intensity and variability, most measurements were. Lidar measurements are often interpreted on the basis of two fundamental assumptions: absence of multiple scattering and sphericity of the particles that make up the diffusing medium.

There are situations in which neither holds true. We focus our interest on multiply-scattered returns from homogeneous layers of monodisperse, randomly oriented, axisymmetric nonspherical particles.

T 2 Chebyshev Cited by: 9.