He-Neレーザによるカオリンおよび底泥の光散乱特性

抄録

The aim of this paper is to describe an apparatus for determining scattering characteristics of suspension by the dissymmetry method which enables the average particle size to be estimated quickly.
This dissymmetry method is based on the fact that the intensity of scattered light is not distributed symmetrically around the axis passing throught the particles in a direction perpendicular to the light beam, because the particle is not a point light-source. Rays scattered from different parts of the particle may give interference.
Therefore, it is possible to estimate the average particle size from the ratio of the intensities of scattered light at two angles, e. g. Z₄₅ at 45°and 135°.
The dependence of the average particle size D_av(μm) by the photo-extinction method of kaolin minerals and sediment on the dissymmetry parameter Z₄₅ is given as follows:
Z₄₅=-0.841D_av+8.363
The dissymmetry method with a He-Ne gas laser as a light source is considered applicable to the estimation of the average particle size in the disposal process of factory wastes containing suspended particles, and to the control of particle size in the wastes as well as the quality control in the production process of factory.