Furthermore, ParticleTech compared a sphericity analysis with a roughness analysis of both samples. As presented in the graph the sphericity analysis showed the same result for both samples. However, the roughness analysis showed a clear distinction between the two samples. Sample 1 (red) had a smaller roughness parameter than sample 2 (blue). A smaller roughness parameter indicates smoother edges.
The roughness parameter indicates the difference between the real edge of a particle and the smoothed edge of the particle. The larger the roughness parameter, the more rough is the particle.