کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5430146 1508706 2009 16 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Light scattering by agglomerates: Interconnecting size and absorption effects (PROGRA2 experiment)
موضوعات مرتبط
مهندسی و علوم پایه شیمی طیف سنجی
پیش نمایش صفحه اول مقاله
Light scattering by agglomerates: Interconnecting size and absorption effects (PROGRA2 experiment)
چکیده انگلیسی

Linear polarization of the scattered light by clouds of dust particles and by very large agglomerates deposited on a surface are studied with the PROGRA2 experiment. A first series of measurements use bare silica spheres and black-coated spheres to compare the phase curves obtained by different sizes of agglomerates with varying albedos. The refractive indices are evaluated by comparison with numerical simulations. Then, the maximum polarization, Pmax, on the phase curves for irregular particles is studied as a function of the size of the grains (equivalent diameters from submicron-sized to hundreds of micrometres) and of the agglomerates (from micrometres to centimetres). A minimum value of Pmax is obtained for silica (about 5% for lifted agglomerates and 3% for layers of particles with a grain size of about 50 μm) and amorphous carbon (about 40% for lifted agglomerates and layers with a grain size of about 0.2 μm). For smaller grain sizes, Pmax increases when the grain size decreases. For larger grain sizes, Pmax increases when the grain size increases. Differences between transparent and absorbing materials are underlined. Such studies may be used to interpret remote observations of light scattering by dust particles in cometary comae and Titan's atmosphere.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Quantitative Spectroscopy and Radiative Transfer - Volume 110, Issues 14–16, September–November 2009, Pages 1755-1770
نویسندگان
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