Abstract
A new method for the determination of particle size and size distribution in powders of rigid particles is described. The method is based on the fact that rigid particles when impinging upon each other emit sound signals whose features are related to the size of the particles, to the size distribution in a powder and also to the shape of the particles. The acoustic frequencies of interest lie in the ultrasonic range and audio-noise can be filtered out. So far, the size of metallic spheres and of glass beads has been measured accurately in the range 3 cm down to 50 μm diameter with less than 10 millisec required to take data for one complete size analysis. The method appears to be applicable to continuous on-line monitoring in crushing, powder processing and in mixing and blending.
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