METHOD AND APPARATUS FOR OBTAINING PARTICLE SIZE DISTRIBUTION BY SPECTRAL LIGHT ABSORPTION MEASUREMENT DURING SEDIMENTATION

摘要

PURPOSE: To accurately obtain the grain size distribution of a wide range in a short analysis time by measuring permeability in suspension liquid in terms of sedimentation time of lights having different wavelengths, and calculating the distribution. ;CONSTITUTION: Both light absorption function K and grain size distribution q₃ (t) are obtained by formulae I and II from permeability measured value T (λ, t) at different light wavelength λ depending upon sedimentation time (t), where K (πx/λ) is light absorption function depending upon substance, ρf is the concentration of suspension liquid, &Ngr; is the viscosity of the liquid ρs is the density of solid particle, c is a constant, ωis number of revolutions per unit time of a centrifugal machine, r is the inner radius of a cuvette, and R is the radius of measuring permeability. For the wavelength i, first Φ(λi, x)=K(πx/λi)q₃(x) is calculated from the corresponding permeability measured value. Then, K (α) is obtained from a formula III. Last, the distribution q₃(x) is obtained from K (α) and Φ(λi, x)=K(πx/λi)q₃ (x). Thus, the spectral light absorption is measured during sedimentation capable of obtaining the distribution in the range of about 0.01 to 10μm.;COPYRIGHT: (C)1994,JPO