[local physicists] Colloquium Announcement 11/20/2012 (Dr. Michael Twardowski)

[Malin, Delicia M.]

Old Dominion University
Department of Physics
Department of Ocean Earth & Atmospheric Sciences

Fall Colloquium Series

Tuesday November 20, 2012

"Angular scattering and holographic imaging microscopy as emerging techniques to characterize oceanic particles"


Dr. Michael Twardowski
WetLabs


Inversions have been developed to interpret unpolarized and polarized light scattering for undisturbed complex natural oceanic particle populations in terms of the particle subfractions (including bubbles) responsible for the scattering.  The inversions are able to quantitatively solve for subfraction size distributions, refractive index (closely linked to particle density), and particle coating thickness where applicable.  We have also developed an in-situ holographic microscope to characterize undisturbed particle size distributions, shapes, and orientations for particles as small as <1 um.  As a whole, these new techniques are showing promise as next generation particle characterization tools for the complex natural particle mixtures observed in aquatic systems.


Presentation: OCNPS 200 @ 3:00 pm
Refreshments: Atrium @ 2:30 pm

More details at http://sci.odu.edu/physics/
All are Welcome!




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