| 摘要 |
PCT No. PCT/RU93/00186 Sec. 371 Date Apr. 5, 1994 Sec. 102(e) Date Apr. 5, 1994 PCT Filed Aug. 5, 1993 PCT Pub. No. WO94/03039 PCT Pub. Date Feb. 17, 1994.A photoelectric method of sedimentation analysis of dispersion systems of a homogeneous substances, wherein a beam of rays having an arbitrary shape is first passed through an unloaded cell and the initial value of the photocurrent created by a non-scattered ray passing through the unloaded cell is measured. The length of the line h between two furtherest spaced from each other points of the projections of two light spots formed on the walls of an unloaded cell is determined on a plane parallel to the direction of sedimentation. Setting the value of the relative methodical error sigma , the quantity H is determined. The beam of rays is positioned so that the middle of the line h is at a depth H from the surface of the suspension. the cell is loaded with the suspension and the period of time tau is measured during which the optical density of the suspension of dispersed particles of powder remains constant from the moment sedimentation begins, and the relative optical density D(t) of the suspension is measured. the radius rmax of the largest powder particles is determined using Stoke's equation. And the velocity of the change of the relative optical density upsilon D with t> tau is used to determine the density nu (r) of powder particle distribution as a function of radius, the density mu (r) of powder mass distribution, the mean value of the radius <r>, the mean square value of the radius <r2>, and the standard deviation DELTA . Scanning of the beam of rays is conducted to speed up sedimentation analysis, where for the beam of rays is positioned nearer to the bottom of the cell by a quantity DELTA H. A converging, diverging or parallel beam of rays is used, the rays being within the wavelength band of from 0.6 mu . to 0.05 mu . |
