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Wyszukujesz frazę "light scattering" wg kryterium: Temat


Wyświetlanie 1-2 z 2
Tytuł:
Algorithms and methods for analysis of the optical structure factor of fractal aggregates
Autorzy:
Mroczka, J.
Woźniak, M.
Onofri, F. R. A.
Powiązania:
https://bibliotekanauki.pl/articles/221757.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fractals
aggregates
light scattering
scattering diagrams
structure factor
Opis:
We introduce numerical methods and algorithms to estimate the main parameters of fractal-like particle aggregates from their optical structure factor (i.e. light scattering diagrams). The first algorithm is based on a direct and simple method, but its applicability is limited to aggregates with large size parameter and intermediate fractal dimension. The second algorithm requires to build calibration curves based on accurate particle agglomeration and particle light scattering models. It allows analyzing the optical structure factor of much smaller aggregates, regardless of their fractal dimension and the size of the single particles. Therefore, this algorithm as well as the introduction of a criteria curve to detect the different scattering regimes, are thought to be powerful tools to perform reliable and reproducible analyses.
Źródło:
Metrology and Measurement Systems; 2012, 19, 3; 459-470
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Using the DDA (Discrete Dipole Approximation) Method in Determining the Extinction Cross Section of Black Carbon
Autorzy:
Skorupski, K.
Powiązania:
https://bibliotekanauki.pl/articles/221846.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
black carbon
discrete dipole approximation
light scattering
fractal-like aggregates
Opis:
BC (Black Carbon), which can be found in the atmosphere, is characterized by a large value of the imaginary part of the complex refractive index and, therefore, might have an impact on the global warming effect. To study the interaction of BC with light often computer simulations are used. One of the methods, which are capable of performing light scattering simulations by any shape, is DDA (Discrete Dipole Approximation). In this work its accuracy was estimated in respect to BC structures using the latest stable version of the ADDA (vr. 1.2) algorithm. As the reference algorithm the GMM (Generalized Multiparticle Mie-Solution) code was used. The study shows that the number of volume elements (dipoles) is the main parameter that defines the quality of results. However, they can be improved by a proper polarizability expression. The most accurate, and least time consuming, simulations were observed for IGT_SO. When an aggregate consists of particles composed of ca. 750 volume elements (dipoles), the averaged relative extinction error should not exceed ca. 4.5%.
Źródło:
Metrology and Measurement Systems; 2015, 22, 1; 153-164
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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