The Umov effect for irregular shaped particles larger than the wavelength
I.V. Tkachev1,2, D.N. Timofeev1, N.V. Kustova1, A.V. Konoshonkin1,2, K.A. Shmirko3
1V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, Tomsk, Russia
2National Research Tomsk State University, Tomsk, Russia
3Far Eastern Federal University, Vladivostok, Russia
Keywords: light scattering, absorption, Umov effect, physical optics, geometric optics, non-spherical particles
Abstract
The paper presents the results of the study of the Umov effect for large compare to the wavelength of the incident radiation nonspherical particles. The calculation was carried out for particles with maximal sizes of 100, 140, 170 and 200 microns. The results were obtained for 210 different refractive indices, the real part of which varied from 1.3 to 1.6 with a step of 0.5, the imaginary part varied from 0 to 0.1344. It has been shown that the Umov effect is fulfilled for all the particles when the imaginary part of the refractive index is less than 0.001.
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