×

Method for measuring the size and velocity of spherical particles using the phase and intensity of scattered light

  • US 4,986,659 A
  • Filed: 10/03/1989
  • Issued: 01/22/1991
  • Est. Priority Date: 02/29/1988
  • Status: Expired due to Term
First Claim
Patent Images

1. In an apparatus for measuring parameters associated with particles, droplets and the like employing first and second Gaussian laser beams caused to cross to establish an interference pattern forming a sample volume, a method for detecting errors due to mixed components in light scattered by said particles, droplets and the like passing through said interference pattern, comprising the steps of:

  • (a) generating said first and second Gaussian laser beams and directing said beams to cross at a known angle to form said sample volume;

    (b) collecting said light scattered by said particles, droplets and the like passing through said sample volume and determining the phase of said scattered light;

    (c) determining the size of said particles, droplets and the like from the phase of said scattered light;

    (d) determining the amplitude of said scattered light and comparing said amplitude to predefined upper and lower amplitude limits for the particle size, such that if said amplitude determined is outside said limits an error is detected and said measurement is considered invalid.

View all claims
  • 4 Assignments
Timeline View
Assignment View
    ×
    ×