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Lane Martin
2007 U.S. Student
Advisor: Aristide Dogariu
"Determining Aspect Ratios of Microscopic
Particles Through Polarization Measurements"
Current methods for determining aspect ratios and shapes of particles
suspeded in a liquid involve the realization of a complete light scattering
pattern and futher theoretical modeling. This is often unsuitable for onthe-
fly work that would be benificial in a hospital setting. A new method
of using polarimetric measurements radiation scattered off nonspherical
particles to determine statistical aspect ratios of particles is discussed
here. This method relies on the particles aligning themselves in a flowing
fluid and scattering incident circularly polarized radiation such that the
polarization becomes elliptical with the long axis matching the long axis
of the particle. Then, the degree of circularly polarized scattered light
can be measured and related to the aspect ratio of the scatterer. ...full text
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