CORRECTION OF THE EFFECT OF PARTICLE-SHAPE ON THE SIZE DISTRIBUTION MEASURED WITH A LASER DIFFRACTION INSTRUMENT

This paper gives a theoretical basis for calculating Fraunhofer diffra ction patterns of arbitrary polyhedron particles. It is shown that thi s solution can be used for calculating a scatter matrix adapted to the particle shape in a straightforward manner. Some simulations were mad e to show the difference between the size distribution by volume obtai ned with a scatter matrix for spheres and with that for the appropriat e shape. Finally, some experimentally measured signatures from platele ts and rods are evaluated in order to show that the spherical equivale nt diameter could be accurately retrieved.