Dynamic light scattering on stimulated droplet surface vibrations caused by high-power laser radiation: particle sizing

Alexander A. Zemlyanov; Yuri E. Geints; Andrei V. Pal'chikov

doi:10.1117/12.411941

29 December 2000 Dynamic light scattering on stimulated droplet surface vibrations caused by high-power laser radiation: particle sizing

Alexander A. Zemlyanov, Yuri E. Geints, Andrei V. Pal'chikov

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Proceedings Volume 4341, Seventh International Symposium on Atmospheric and Ocean Optics; (2000) https://doi.org/10.1117/12.411941
Event: 7th International Symposium on Atmospheric and Ocean Optics, 2000, Tomsk, Russian Federation

Abstract

The vibrations of droplet surface results in origin of a dynamic component of scattered light. These vibrations arise or by virtue of natural reasons connected with a movement of particles in the atmosphere, or can be stimulated by modulated light radiation. The vibration frequencies of droplets are unequivocally determined by their sizes and properties of a liquid, that gives an opportunity of reception of the quantitative information about size distribution, proceeding from frequency behavior of a dynamic light scattering component. The resonant stimulation of droplets vibration causes increase of dynamic light scattering component amplitude. Besides, use of the modulated radiation results in synchronizing of droplets vibrations, that leads to the best detecting of a dynamic light scattering component in comparison with spontaneous vibrations of drops. The numerical modeling of dynamic light scattering on stimulated ponderomotive vibrations of polydispersed aerosol droplets is carried out. The direct task is solved and is shown, that frequency behavior of intensity of light scattering is sensitive to the changes of an initial size distribution. The solution of inverse problem allows us to restore particle size distribution with satisfactory accuracy. The analysis of solution stability has shown, that for droplets sizes lager 1 micrometer the restored size distribution is stable to small mistakes in frequency behavior of scattered light intensity.

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Alexander A. Zemlyanov, Yuri E. Geints, and Andrei V. Pal'chikov "Dynamic light scattering on stimulated droplet surface vibrations caused by high-power laser radiation: particle sizing", Proc. SPIE 4341, Seventh International Symposium on Atmospheric and Ocean Optics, (29 December 2000); https://doi.org/10.1117/12.411941

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