Coherent and incoherent additions of light beams at solutions of the light scattering problem by use the beam tracing method within the framework of physical optics

2015 ◽  
Author(s):  
Alexander V. Konoshonkin ◽  
Natalia V. Kustova ◽  
Anatoli G. Borovoi ◽  
Hajime Okamoto
Keyword(s):  
Light Scattering ◽  
Scattering Problem ◽  
Physical Optics ◽  
Light Beams ◽  
Tracing Method

scholarly journals Using the Physical Optics Approximation for Estimating the Light Scattering Properties of Large Dust Particles for Lidar Applications

2020 ◽  
Vol 237 ◽  
pp. 08025
Author(s):  
Alexander Konoshonkin ◽  
Natalia Kustova ◽  
Anatoli Borovoi ◽  
Alexandra Tsekeri ◽  
Josef Gasteiger
Keyword(s):  
Light Scattering ◽  
Extinction Coefficient ◽  
Scattering Problem ◽  
Power Laws ◽  
Scattering Matrix ◽  
Dust Particles ◽  
Physical Optics ◽  
Depolarization Ratio ◽  
Physical Optics Approximation ◽  
Dda Method

The physical optics approximation was used to solve the light scattering problem of large dust particles with irregular shape. The comparison between the physical optics approximation and the DDA method was made for particles with volume-equivalent size parameters of 44.21. A full light scattering matrix (Mueller matrix) was calculated for particles with volume-equivalent size parameters from 44 up to 220 for two wavelengths: 0.532 and 1.064 μm. The dependences of the lidar and depolarization ratio, and extinction coefficient on the number of spatial orientations of the particle were obtained. It was shown that the elements of the light backscattering matrix obey power laws.

scholarly journals Light Backscattering by Ice Crystals of Cirrus Clouds Within the Physical Optics Approximation

2020 ◽  
Vol 237 ◽  
pp. 08011
Author(s):  
Alexander Konoshonkin ◽  
Anatoli Borovoi ◽  
Natalia Kustova ◽  
Zhenzhu Wang ◽  
Dong Liu ◽  
...  
Keyword(s):  
Light Scattering ◽  
Spatial Orientation ◽  
Scattering Problem ◽  
Cirrus Clouds ◽  
Ice Crystals ◽  
Physical Optics ◽  
Nonspherical Particles ◽  
Physical Optics Approximation ◽  
Computer Resources

Lidar technologies are widely used for retrieving microphysics of cirrus clouds, i.e. sizes, shapes and spatial orientation of ice crystals constituting the clouds. Interpretation of the lidar signals are based on the backscattered light. However, properties of the light backscattered by the ice crystals have not been well known and understood yet. The reason of this is that the problem of light scattering by the ice crystals much larger that incident wavelengths has not been solved satisfactorily yet because of great demands to computer resources. In this contribution we review the physical optics approximation as a prospective method to solve the light scattering problem on large nonspherical particles in lidar application.

Study of the convergence of the numerical solution of the light scattering problem by atmospheric ice crystals within the physical optics method

2021 ◽  
Author(s):  
Alexander V. Konoshonkin ◽  
Ilia V. Tkachev ◽  
Victor A. Shishko ◽  
Dmitrii N. Timofeev ◽  
Natalia V. Kustova
Keyword(s):  
Light Scattering ◽  
Numerical Solution ◽  
Scattering Problem ◽  
Ice Crystals ◽  
Physical Optics

Application of the Solution of the Inverse Light Scattering Problem for Characterization of Mononuclear Cells

2009 ◽  
Vol 4 (2) ◽  
pp. 61-68
Author(s):  
Dmitriy Strokotov ◽  
Yuriy Pichugin ◽  
Maxim Yurkin ◽  
Mariya Gridina ◽  
Oleg Serov ◽  
...  
Keyword(s):  
Stem Cells ◽  
Light Scattering ◽  
Mononuclear Cells ◽  
Human Lymphocytes ◽  
Scattering Problem ◽  
Refractive Indices ◽  
Single Particles ◽  
Differentiation Status

In this manuscript we propose two methods to solve inverse light scattering problem for single particles, which can be described as a coated sphere. The efficiency of the methods is illustrated by characterization of lymphocytes and stem cells using light scattering patterns obtained with scanning flow cytometer. Both methods, spectral and global optimization, were used to obtain diameters and refractive indices of the cytoplasm and the nucleus of mice embryo stem cells and human lymphocytes. These results agree with data obtained from other studies. Determination of these parameters is important for diagnostics of pathological states of lymphocytes and differentiation status of embryo stem cells. Moreover, methods described in this manuscript are applicable to all mononuclear cells. We also considered limitations of these methods and their possible improvements.

Light scattering by ice crystals of cirrus clouds: From exact numerical methods to physical-optics approximation

2017 ◽  
Vol 195 ◽  
pp. 132-140 ◽  
Author(s):  
Alexander Konoshonkin ◽  
Anatoli Borovoi ◽  
Natalia Kustova ◽  
Hajime Okamoto ◽  
Hiroshi Ishimoto ◽  
...  
Keyword(s):  
Light Scattering ◽  
Numerical Methods ◽  
Cirrus Clouds ◽  
Ice Crystals ◽  
Physical Optics ◽  
Physical Optics Approximation
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