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A modified method for detection of interface and onset point in the asphaltenic fluids
, Article Energy Sources, Part A: Recovery, Utilization and Environmental Effects ; 2020 ; Bayat Shahparast, M ; Barzegar, F ; Sharif University of Technology
Taylor and Francis Inc
2020
Abstract
Asphaltene precipitation and deposition causes many serious problems to the petroleum industry from the reservoir to the surface facilities. Therefore, it is important to bring it under control by finding a method to accelerate or slow down its precipitation and deposition. For achieving this purpose two parameters play an important role; onset point of the precipitation and amount of the deposited phase. When asphaltene precipitates, it is capable of depositing in the solution. After the deposition, the solution split into two phases; asphaltene-rich and asphaltene-lean. Determining the amount of the deposited phase needs to distinguish the interface between two phases. In this study, a...
Images of finite sized spherical particles in confocal and conventional microscopes when illuminated with arbitrary polarization
, Article Applied Optics ; Volume 47, Issue 3 , 2008 , Pages 453-458 ; 1559128X (ISSN) ; Massoumian, F ; Sharif University of Technology
OSA - The Optical Society
2008
Abstract
We investigate the form of the image of a finite sized spherical particle in confocal and conventional microscopes when the illuminating light has an arbitrary polarization. In particular, we take the cases of radial and azimuthal polarizations and use the Mie theory to find the scattered field from differently sized particles for these cases. We present numerical results for the changes in the detected intensity when subresolution and resolvable spherical particles are illuminated with particular wavelengths and polarizations. Further, we find the limiting size of a particle for which it can be considered a point scatterer for a particular wavelength. © 2008 Optical Society of America