State-of-the-art laser diffraction particle size analyserMeasuring method

To calculate the particle size distribution from the measured scattering spectra, the theory of either FRAUNHOFER or MIE is applied. The FRAUNHOFER theory is based on the hypothesis of opaque and spherical particles: the scattered pattern corresponds to a thin opaque two-dimensional plate – diffraction only occurs at the edges. Therefore no additional optical input constants of the material are necessary for this calculation.

The cumulative throughput curve Q3 (blue) and the resulting histogram (q3, black bar) can be seen.

ISO 13320 – Particle size analysis – Laser diffraction methods

particle size instrument , particle measurement