Численное исследование особенностей альбедо однократного рассеяния лучистой энергии, прошедшей через полидисперсное кристаллическое образование
| Parent link: | Известия вузов. Физика: научный журнал.— , 1957- Т. 57, № 10, ч. 2.— 2014.— [С. 116-121] |
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| Summary: | Заглавие с экрана Выполнен анализ влияния оптических и микрофизических параметров неоднородной среды на спектральную зависимость вероятности выживания кванта излучения видимого и ИК-диапазонов длин волн. В качестве моделей частиц рассмотрены сферические частицы и горизонтально ориентированные пластинчатые кристаллы с учетом функции распределения частиц по размерам. Для расчета характеристик светорассеяния применялись теория Ми и метод физической оптики. Studies of the role of atmospheric formations and cosmic dust clouds in the transmission of radiation is one of the most uncertain and difficult problems in astrophysics and climatology. One of the main tasks of practical astrophysics is the interpretation of the results of observations of space objects. There is a necessity of describing the propagation of electromagnetic waves in the environment. In this paper, applying the numerical methods, we study the optical characteristics of polydisperse media consisting of randomly oriented and preferentially oriented crystals, taking into account the distribution function of particle sizes. Particles of spherical shape and ensembles preferentially oriented plate crystals are considered as models. Mie theory and method of physical optics are used to calculate the scattering characteristics. Numerical study of the effects of extinction, scattering and absorption on the single scattering albedo of radiation allowed us to establish the basic patterns of the passage of radiant energy through a translucent medium. At the visible range of wavelengths, both for small and large particles, the single scattering albedo is almost equal to 1. The spectral course of this optical performance is mainly determined by the refractive index of the particles. Features of wave dependence of single scattering albedo are associated with microphysical parameters of the environment, which are more pronounced when the attenuation of the radiation is determined mainly by the scattering. Higher values of the absorption index and optical thickness of the crystal reduce the value of the single scattering albedo, smoothing the features of its spectral course. Режим доступа: по договору с организацией-держателем ресурса |
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2014
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| Online Access: | http://elibrary.ru/item.asp?id=23573494 |
| Format: | Electronic Book Chapter |
| KOHA link: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=644502 |