In finding the particle-size distribution from the pattern of diffracted light and the intensity distribution, the layout of particles imposes a tremendous influence on the formation of the diffracted light pattern. To measure an accurate particle size distribution, it is a must to use an analyzer designed and made after considering not only the parameters including particle shape, direction and concentration but also the effect of the particle layout. The calibration specimens must also have been designed and made to cope with the random layout of particles, in which actual samples are distributed by the liquid or gas phase. It is improper to use a wire mesh sieve or its equivalent that is equipped with a regular hole array as an offhand specimen for calibration of a laser diffraction type particle size analyzer, for the reason that the particle diameter and the hole size are determined.
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