Scattering by Particles of Non-Spherical Shape

Zerull, R. H.; Giese, R. H.; Schwill, S.; Weiss, K.

doi:10.1007/978-1-4684-3704-1_32

Cited by 28 publications

(9 citation statements)

References 4 publications

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“…In comparison to spherical particles, the phase function of irregular particles generally shows increased sideward but reduced backward scattering if the particles are relatively large in comparison to the wavelength (Zerull et al, 1980;Koepke and Hess, 1988;Nousiainen, 2009; and see Fig. 1).…”

Section: Introductionmentioning

confidence: 95%

Technical Note: Optical properties of desert aerosol with non-spherical mineral particles: data incorporated to OPAC

Koepke¹,

Gasteiger²,

Heß

2015

Atmos. Chem. Phys.

103

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Abstract. Mineral particles, in general, are not spheres and so the assumption of spherical particles, instead of more realistic shapes, has significant effects on modeled optical properties and therefore on remote-sensing procedures for desert aerosol and the derived radiative forcing. Thus, in a new version of the database OPAC (Optical Properties of Aerosols and Clouds; Hess et al., 1998), the optical properties of the mineral particles are modeled describing the particles as spheroids with size dependent aspect ratio distributions, but with the size distributions and the spectral refractive indices not changed against the previous version of OPAC. The spheroid assumption is known to substantially improve the scattering functions but pays regard to the limited knowledge on particle shapes in an actual case. The relative deviations of the optical properties of non-spherical mineral particles from those of spherical particles are for the phase function in the solar spectral range up to +60 % at scattering angles of about 130 • and up to −60 % in the backscatter region, but less than 2 % for the asymmetry parameter. The deviations are generally small in the thermal infrared and for optical properties that are independent of the scattering angle. The improved version of OPAC (4.0) is freely available at www.rascin.net.

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Section: Introductionmentioning

confidence: 95%

Technical Note: Optical properties of desert aerosol with non-spherical mineral particles: data incorporated to OPAC

Koepke¹,

Gasteiger²,

Heß

2015

Atmos. Chem. Phys.

103

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“…The degree of linear polarization reaches a maximum of about 40% at a scattering angle 223 0 ~ 80°. These are the typical scattering patterns of terrestrial highly irregularly shaped absorbing particles investigated by light scattering experiments (WeiB-Wrana, 1983) and by the microwave analoge technique (Zerull et al, 1980). In the case of a less absorptive particle of the inclusion (diameter = 50 urn) the values of the positive degree of polarization are significantly smaller without the distinct maximum of polarization, see Fig.lb.…”

mentioning

confidence: 68%

“…3 a polydisperse mixture of five small two-components fluffy particles containing dielectric and absorbing constituents show the same scattering characteristic. Purely irregularly nonabsorbing compact and fluffy particles cannot resemble the optical properties in the visible, they show rather isotropic scattering for larger scattering angles and no pronounced polarization (Zerull et al, 1980). …”

Section: Cometary Dustmentioning

confidence: 99%

Experimental Results on Scattering by Irregular and Meteoritic Dust Particles Related to Photopolarimetry of Zodiacal Light and Comets

Weiss-Wrana

Giese

Zerull

1985

International Astronomical Union Colloquium

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ABSTRACT. The investigations of light scattering by larger meteoritic and terrestrial single grains (size range 20 urn to 120 urn) demonstrate that the scattering properties of irregularly shaped dark opague particles with very rough surfaces resemble the characteristic features of the empirical scattering function as derived from measurements of the zodiacal light. Purely transparent or translucent irregularly shaped particles show a guite different scattering behaviour. Furthermore irregular and multicomponent fluffy particles in the size range of a few microns were modelled by microwave analog measurements in order to explain positive and negative polarization of the light scattered by cometary dust grains .

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“…Resonances result when waves that enter a sphere at different locations are refracted and internally reflected in such a manner that they exit the sphere in the same direction. Because resonances involve interference as well as geometric optics their amplitudes are extremely sensitive to the detailed shape of the particle, so that even small departures from a perfect spherical shape will broaden the peaks and reduce their height (Zerull et al, 1980;McGuire and Hapke, 1995;Mishchenko et al, 1996). It is reasonable to expect that the mass-produced particles of our powder are not perfect spheres.…”

Section: Bug Datamentioning

confidence: 97%

A quantitative test of the ability of models based on the equation of radiative transfer to predict the bidirectional reflectance of a well-characterized medium

Hapke

Shepard

Nelson

et al. 2009

Icarus

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Scattering by Particles of Non-Spherical Shape

Cited by 28 publications

References 4 publications

Technical Note: Optical properties of desert aerosol with non-spherical mineral particles: data incorporated to OPAC

Technical Note: Optical properties of desert aerosol with non-spherical mineral particles: data incorporated to OPAC

Experimental Results on Scattering by Irregular and Meteoritic Dust Particles Related to Photopolarimetry of Zodiacal Light and Comets

A quantitative test of the ability of models based on the equation of radiative transfer to predict the bidirectional reflectance of a well-characterized medium

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