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Optical process and apparatus for determining particle size of colloidal solution

  • US 4,274,740 A
  • Filed: 07/19/1979
  • Issued: 06/23/1981
  • Est. Priority Date: 07/21/1978
  • Status: Expired due to Term
First Claim
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1. A method for determining the particle size of a colloidal solution, especially a synthetic resin dispersion, the method including the steps of:

  • providing a colloidal solution sample with a thickness which varies in a given direction;

    directing a light beam to propagate through the colloidal solution sample in the direction normal to said given direction;

    causing the emerging light beam from the sample to undergo chromatic dispersion and to be incident onto an image screen;

    establishing, by a relative displacement between the light beam and the varying thickness of the colloidal solution sample, a sample position which results in only the long-wave part of the visible spectrum to appear on the screen;

    determining the thickness of the colloidal solution section which is traversed by the beam at said position; and

    , determining the particle size of the colloidal solution in accordance with the formula;

    ##EQU5## where r=radius of the particle (μ

    m),c=concentration of the colloidal solution in volume %,d=thickness of measured colloidal solution sample section (mm),E.sub.(c) =concentration factor at concentration c, andn=a constant.

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