Measurement of Particle Size and Shape Distribution For ... - Nasa

which is to be expected. The noise at the bottom end of the number distribution is caused by the
visible light cut off and the resolution limit.
The Morpholgi G2 provides several shape distributions for each sample. Plots for some of the
most commonly used shape parameters are shown below for each sample. Figures 6-5 shows an
overplot circularity distributions for 121 and 026.
HS Circularity smoothed over 30 points
0.9
0.8
0.7
0.6
0.5
%
0.4
0.3
0.2
0.1
0.0
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1
HS Circularity
Record 3: Lunar Highlands Sim 121 Record 4: Lunar Highlands Sim 026
Figure 6-5 HS Circularity distribution for 121 (red) and 026 (green).
Sample 026 shows a larger proportion of lower circularity material than 121, although the bulk
of the material has a HS circularity around 0.9. Figure 6-6 show aspect ratio distributions for 121
and 026. Here again, 026 shows more material with a lower aspect ratio.