Optical properties of core-mantle spheroidal particles

Vadim V. Somsikov; Victor G. Farafonov

doi:10.1117/12.196666

23 December 1994 Optical properties of core-mantle spheroidal particles

Vadim V. Somsikov, Victor G. Farafonov

Proceedings Volume 2309, Passive Infrared Remote Sensing of Clouds and the Atmosphere II; (1994) https://doi.org/10.1117/12.196666
Event: Satellite Remote Sensing, 1994, Rome, Italy

Abstract

The new solution of the problem of light scattering by coated spheroids was used to calculate the optical properties of prolate and oblate particles. The solution was obtained by the method of separation of variables for confocal spheroids. We consider the silicate core ice mantle particles and present the extinction cross-sections for prolate and oblate spheroids with the refractive indices m_core equals 1.7 + Oi, 1.7 + 0.1i and m_mantle equals 1.3, the aspect ratio (a/b)_mantle equals 2 and various volume ratios V_core/V_total. The results are plotted for different size parameters x_v equals 2(pi) r_v/(lambda) , where r_v is the radius of equivolume sphere and (lambda) is the wavelength of incident radiation. The main conclusions are: (a) if V_core/V_total equals 0.5, the optical properties of a core-mantle particle are determined mainly by its core: for prolate non-absorbing spheroids when x_v <EQ 4.5; for prolate absorbing spheroids when x_v <EQ 4.5 or x_v > 10, for oblate absorbing and non-absorbing spheroids when x_v <EQ 10. (b) the linear growth of the extinction cross-sections on the volume ratio V_core/V_total is obtained for prolate particles with x_v equals 1 and 2. (c) the non-linear increase of cross- sections is obtained for oblate particles with size parameters x_v equals 1 - 5. (d) the small imaginary part of the core refractive index m [Im(m) < 0.01] practically does not change the optical properties of an inhomogeneous particle. When the imaginary part reaches 0.1, the noticeable changes of cross-sections may be detected.

Citation Download Citation

Vadim V. Somsikov and Victor G. Farafonov "Optical properties of core-mantle spheroidal particles", Proc. SPIE 2309, Passive Infrared Remote Sensing of Clouds and the Atmosphere II, (23 December 1994); https://doi.org/10.1117/12.196666

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