The particle size distribution of MIM powders is generally measured by laser particle size analyzer, because laser has good monochromaticity and strong directivity.

When the beam encounters a particle barrier, a part of the light will scatter. The propagation direction of scattered light forms an angle with that of the main beam.

The size of scattering angle is related to the size of particles. The larger the particle is, the smaller the angle of scattering light is, while the smaller the particle is, the larger the angle of scattering light is.

The intensity of scattered light represents the particles quantity. So the particle size distribution can be obtained by measuring the intensity of scattered light at different angles.