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Interferometric apparatus and method for detection and characterization of particles using light scattered therefrom

  • US 4,764,013 A
  • Filed: 03/23/1987
  • Issued: 08/16/1988
  • Est. Priority Date: 03/23/1987
  • Status: Expired due to Fees
First Claim
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1. Apparatus for the indentification and characterization of particles in a sample by observing light scattered therefrom, comprising in combination:

  • means for producing a first radiation having a first wavelength and a first polarization;

    means for producing a second radiation substantially collinear with said first radiation and having a second wavelength and a second polarization substantially orthogonal to said first polarization;

    containment means containing said sample, for allowing said first and second radiations to scatter from collisions with said particles in said sample;

    polarization means receiving scattered first and second radiations for resolving said scattered first and second radiations, said polarization means having an axis of transmission along which resolved scattered first and second radiations pass;

    photodetector means receiving and detecting said resolved scattered first and second radiations for outputting a beat frequency resulting from interaction between said resolved scattered first and second radiations, said beat frequency having a relative phase and amplitude; and

    measurement means receiving said beat frequency for measuring and outputting said relative phase of said beat frequency, for use in identifying and characterizing said particles.

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