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The effect of airborne dust on astronomical polarization measurements
(2008-05-11)
In the past, it has generally been assumed that polarization observations made with ground-based telescopes are unaffected by the passage of light through the Earth's atmosphere. Here, we report observations with a new ...
Measurement and modeling of light scattering by small particles.
(University of Bremen, 2008)
At the University of Hertfordshire we measure and model light scattering by small particles, in particular by such relevant for climate research. The measurements comprise phase functions, linear polarization of single ...
Initial investigation into using Fourier spectra as a means of classifying ice crystal shapes
(University of Hertfordshire, 2008)
Fast Fourier Transforms of azimuthal light scattering patterns are investigated as a method for classifying cirrus cloud ice crystals. Small Ice Detector Mk. 2 data is compared to modelled reference data of various aspect ...
Application of RTDF to particles with curved surfaces
(University of Hertfordshire, 2008)
The applicability of RTDF is extended to particles with curved surfaces. This allows tests against T-matrix calculations for larger size parameter and modeling of light scattering by more realistic particle shapes, such ...
Theoretical determination of the radiation force for a spherical particle illuminated by a focused laser beam
(2008)
Trapping forces on dielectric spheres in single beam laser tweezers are computed. A focused beam description based on an exact solution of Maxwell’s equations is compared to the 5th order Gaussian beam approximation due ...
A light scattering instrument for investigating cloud ice microcrystal morphology
(2008)
We describe an optical scattering instrument designed to assess the shapes and sizes of microscopic atmospheric cloud particles, especially the smallest ice crystals that can profoundly affect cloud processes and radiative ...
Investigation into Single Scattering Properties of Airborne Saharan Dust Particles
(2008)
The phase functions of single mineral dust particles levitated in an electrodynamic balance have been measured. Normalized phase functions and the asymmetry parameter could be determined because nearly the full range of ...
Influence of Alignment on the Scattering Properties Atmospheric Mineral Dust
(2008)
We carry out an investigation of the influence of particle alignment on the scattering properties of mineral dust layers. Our modelling indicates that in addition to modifying optical thickness, the alignment can significantly ...