Light scattering by randomly oriented spheroidal particles.

Light scattering properties of an assembly of randomly oriented, identical spheroidal particles are studied. A computation scheme has been developed to integrate the solution of Asano and Yamamoto for scattering from a homogeneous spheroid over all the particle orientations. The extinction and scattering cross sections, asymmetry factor, and scattering matrix elements are calculated for randomly oriented prolate and oblate spheroids and compared with both calculations for spheres and laboratory measurements, The scattering cross section, single scattering albedo, and asymmetry factor of spheroids tend to be larger than those for spheres of the same volume. The normalized scattering matrix has a symmetrical form with six independent elements. The angular scattering behavior of spheroids is found to be greatly different from that of spheres for side scattering to backscattering directions. In general, prolate and oblate spheroids of the same shape parameter have similar angular scattering patterns. The angular distribution of scattered intensity is characterized by strong forward scattering and weak backscattering. The linear polarization tends to be positive at intermediate scattering angles. The linear polarization and depolarization are discussed in application to scattering in the earth and planetary atmospheres.

[1]  S. H. Chen,et al.  Accuracy of RGD approximation for computing light scattering properties of diffusing and motile bacteria. , 1979, Applied optics.

[2]  Ronald G. Pinnick,et al.  Nonunitarity of the light scattering approximations. , 1979, Applied optics.

[3]  Peter G. Martin,et al.  On the shape of interstellar grains , 1979 .

[4]  S. Asano,et al.  Light scattering properties of spheroidal particles. , 1979, Applied optics.

[5]  Validity of modifying Mie theory to describe scattering by nonspherical particles. , 1978, Applied optics.

[6]  P. Chylek,et al.  Scattering by nonspherical particles and optical properties of Martian dust , 1978 .

[7]  R. Welch,et al.  Nonspherical extinction and absorption efficiencies. , 1978, Applied optics.

[8]  D. Huffman,et al.  Experimental determinations of Mueller scattering matrices for nonspherical particles. , 1978, Applied optics.

[9]  K. Dedrick,et al.  Bistatic radar scattering by randomly oriented wires , 1978 .

[10]  C. M. R. Platt.  Lidar Backscatter from Horizontal Ice Crystal Plates , 1978 .

[11]  P. Barber,et al.  Rayleigh-Gans-Debye applicability to scattering by nonspherical particles. , 1978, Applied optics.

[12]  K. Sassen.  Optical backscattering from near-spherical water, ice, and mixed phase drops. , 1977, Applied optics.

[13]  Kenneth Sassen,et al.  Ice Crystal Habit Discrimination with the Optical Backscatter Depolarization Technique , 1977 .

[14]  G. Grams,et al.  Light Scattering by Irregular Randomly Oriented Particles , 1976, Science.

[15]  P. Chylek.  Partial-wave resonances and the ripple structure in the Mie normalized extinction cross section , 1976 .

[16]  R. G. Pinnick,et al.  Polarized light scattered from monodisperse randomly oriented nonspherical aerosol particles: measurements. , 1976, Applied optics.

[17]  W. Irvine.  Multiple scattering in planetary atmospheres , 1975 .

[18]  K. Sassen.  Laser depolarisation ‘bright band’ from melting snowflakes , 1975, Nature.

[19]  S. Asano,et al.  Light scattering by a spheroidal particle. , 1975, Applied optics.

[20]  Kenneth Sassen,et al.  Depolarization of Laser Light Backscattered by Artificial Clouds , 1974 .

[21]  J. Hansen,et al.  Light scattering in planetary atmospheres , 1974 .

[22]  J. W. Hovenier,et al.  Interpretation of the polarization of Venus , 1974 .

[23]  K. Liou,et al.  Laser Sensing of Cloud Composition: A Backscattered Depolarization Technique , 1974 .

[24]  D. W. Cooper,et al.  Measurements of depolarization by dry and humidified salt aerosols using a lidar analogue , 1974 .

[25]  S. Pal,et al.  Polarization properties of lidar backscattering from clouds. , 1973, Applied optics.

[26]  A. Carswell,et al.  Laboratory measurements of light scattering by simulated atmospheric aerosols. , 1972, Applied optics.

[27]  K. Liou.  Light scattering by ice clouds in the visible and infrared - A theoretical study. , 1972 .

[28]  Kenneth Sassen,et al.  Observations by Lidar of Linear Depolarization Ratios for Hydrometeors. , 1971 .

[29]  J. Hansen,et al.  Intensity and Polarization for Single Scattering by Polydisperse Spheres: A Comparison of Ray Optics and Mie Theory , 1971 .

[30]  P. Huffman.  Polarization of Light Scattered by Ice Crystals , 1970 .

[31]  A. C. Holland,et al.  The scattering of polarized light by polydisperse systems of irregular particles. , 1970, Applied optics.

[32]  D. Coffeen.  Wavelength Dependence of Polarization. XVI. Atmosphere of Venus , 1969 .

[33]  J. Meltzer,et al.  The Effect of Orientation of Non-Spherical Particles on Interstellar Extinction. , 1960 .

[34]  W. Elliott,et al.  Two Instruments for Atmospheric Optics Measurements , 1960 .

[35]  V. Vouk.  Projected Area of Convex Bodies , 1948, Nature.