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Holographic detection and characterization of large impurity particles in precision slurries

  • US 10,641,696 B2
  • Filed: 09/15/2016
  • Issued: 05/05/2020
  • Est. Priority Date: 09/18/2015
  • Status: Active Grant
First Claim
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1. A method of characterizing impurities in a sample of a slurry of particles a fluid, comprising:

  • flowing the slurry through an observation volume of a holographic microscope;

    generating a first holographic image, by a holographic video microscopy system having a laser, of the sample within the observation volume at a first time;

    analyzing the first holographic image for one or more regions of interest corresponding to a particle of interest;

    normalizing the region of interest for a contribution of a diffuse wave created by interaction of the laser with the slurry;

    fitting the normalized region of interest to a light scattering theory; and

    characterizing, based upon the fitting of the normalized region of interest, one or more properties of particle of interest;

    wherein a depth of the observation volume is less than the attenuation depth of the laser in the slurry.

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