Universality of fractal aggregates as probed by light scattering

1990 ◽  
pp. 71-88 ◽  
Keyword(s):  
Light Scattering ◽  
Fractal Aggregates

Characterization of large fractal aggregates by small-angle light scattering

2002 ◽  
Vol 13 (3) ◽  
pp. 357-364 ◽  
Author(s):  
S Stone ◽  
G Bushell ◽  
R Amal ◽  
Z Ma ◽  
H G Merkus ◽  
...  
Keyword(s):  
Light Scattering ◽  
Small Angle ◽  
Fractal Aggregates ◽  
Small Angle Light Scattering

Light scattering by fractal aggregates : a numerical investigation

1988 ◽  
Vol 49 (11) ◽  
pp. 1969-1976 ◽  
Author(s):  
J. Frey ◽  
J.J. Pinvidic ◽  
R. Botet ◽  
R. Jullien
Keyword(s):  
Light Scattering ◽  
Numerical Investigation ◽  
Fractal Aggregates

Structural Interpretations of Static Light Scattering Patterns of Fractal Aggregates

2000 ◽  
Vol 228 (2) ◽  
pp. 386-392 ◽  
Author(s):  
A. Thill ◽  
S. Lambert ◽  
S. Moustier ◽  
P. Ginestet ◽  
J.M. Audic ◽  
...  
Keyword(s):  
Light Scattering ◽  
Static Light Scattering ◽  
Fractal Aggregates

scholarly journals Simplifying the calculation of light scattering properties for black carbon fractal aggregates

2014 ◽  
Vol 14 (15) ◽  
pp. 7825-7836 ◽  
Author(s):  
A. J. A. Smith ◽  
R. G. Grainger
Keyword(s):  
Light Scattering ◽  
Black Carbon ◽  
Cross Sections ◽  
Asymmetry Parameter ◽  
Size Distributions ◽  
Fractal Aggregates ◽  
Lognormal Distributions ◽  
Spherical Models ◽  
Computationally Expensive ◽  
Scattering Cross Sections

Abstract. Black carbon fractal aggregates have complicated shapes that make the calculation of their optical properties particularly computationally expensive. Here, a method is presented to estimate fractal aggregate light scattering properties by optimising simplified models to full light scattering calculations. It is found that there are no possible spherical models (at any size or refractive index) that well represent the light scattering in the visible or near-thermal infrared. As such, parameterisations of the light scattering as a function of the number of aggregate particles is presented as the most pragmatic choice for modelling distributions of black carbon when the large computational overheads of rigorous scattering calculations cannot be justified. This parameterisation can be analytically integrated to provide light scattering properties for lognormal distributions of black carbon fractal aggregates and return extinction cross sections with 0.1% accuracy for typical black carbon size distributions. Scattering cross sections and the asymmetry parameter can be obtained to within 3%.

scholarly journals Determining of geometrical characteristic parameters of particle fractal aggregates from light scattering measurement signals

2020 ◽  
pp. 203-203
Author(s):  
Liang Xu ◽  
Zhen-Zong He ◽  
Jun-Kui Mao ◽  
Xing-Si Han
Keyword(s):  
Particle Swarm Optimization ◽  
Light Scattering ◽  
Fitness Function ◽  
Particle Swarm ◽  
Pso Algorithm ◽  
Fractal Aggregates ◽  
Swarm Optimization ◽  
Repulsive Particle Swarm Optimization ◽  
Light Scattering Measurement ◽  
Scattering Measurement

Two kind of light scattering measurement methods, i.e. the forward light scattering measurement (FLSM) method and the angular light scattering measurement (ALSM) method, are applied to reconstruct the geometrical morphology of particle fractal aggregates. An improved Attractive and Repulsive Particle Swarm Optimization (IARPSO) algorithm is applied to reconstruct the geometrical structure of fractal aggregates. It has been confirmed to show better convergence properties than the original Particle Swarm Optimization (PSO) algorithm and the Attractive and Repulsive Particle Swarm Optimization (ARPSO) algorithm. Compared with the FLSM method, the ASLM method can obtain more accurate and robust results as the distribution of the fitness function value obtained by the ALSM method is more satisfactory. Meanwhile, the retrieval accuracy can be improved by increasing the number of measurement angles or the interval between adjacent measurement angles even when the random noises are added. All the conclusions have important guiding significance for the further study of the geometry reconstruction experiment of fractal aggregates.

Structural Interpretations of Static Light Scattering Patterns of Fractal Aggregates

2000 ◽  
Vol 228 (2) ◽  
pp. 379-385 ◽  
Author(s):  
S. Lambert ◽  
A. Thill ◽  
P. Ginestet ◽  
J.M. Audic ◽  
J.Y. Bottero
Keyword(s):  
Light Scattering ◽  
Static Light Scattering ◽  
Fractal Aggregates
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