gallery of selected flakes.
Besides writing the acquisition software for the MASC, we ran microwave scattering calculations on a few targets using DDSCAT software package. The results are shown in the paper. PBRT renderer was used to visualize the targets. The images below show the synthetic volumetric cube targets, where ice is shown as red and air is shwon as blue transparent cubes. From left to right are fully filled lattice, extruded front frace of alternating materials in 2D and lattice with materials alternating in 3D.
Since the MASC takes pictures of snowflakes, we are able to compute scattering off real snowflakes by using the volumes built by extruding the captured image of a snowflake. The top row of images below shows the targets used for scaterring, while the bottom row shows the corresponding captured images.
@article{amt-5-2625-2012,
title = {Fall speed measurement and high-resolution multi-angle photography of hydrometeors in free fall},
author = {Garrett, T. J. and Fallgatter, C. and Shkurko, K. and Howlett, D.},
journal = {Atmospheric Measurement Techniques},
volume = {5},
year = {2012},
number = {11},
pages = {2625--2633},
url = {http://www.atmos-meas-tech.net/5/2625/2012/},
doi = {10.5194/amt-5-2625-2012}
}
The MASC was developed with support from NASA, NSF, the US Army, and the University of Utah Technology Commercialization Office. We disclose that T. J. G. and C. F. are co-owners of Fallgatter Technologies which designs, builds and sells the MASC.