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System and method for detecting and classifying biological particles

  • US 6,885,440 B2
  • Filed: 11/07/2002
  • Issued: 04/26/2005
  • Est. Priority Date: 11/07/2001
  • Status: Expired due to Term
First Claim
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1. A system for detecting and classifying an airborne biological particle, comprising;

  • a single laser to illuminate an individual biological particle wherein the particle is dimensioned to be an inhalable particle;

    a first detector to detect light scattered due to illumination of the airborne biological particle by the laser;

    a second detector to detect fluorescence emission from the airborne biological particle due to illumination of the airborne biological particle by the laser;

    a processor to determine a first peak or integrated pulse amount of light detected by the first detector, a second peak or integrated pulse amount of light detected by the second detector, and to calculate a ratio of the first and second peak or integrated pulse and to compare to a library comprising a plurality of ratios of scattering peaks to auto-fluorescence peaks; and

    wherein the processor compares the calculated ratio with the plurality of ratios stored in the library to classify the airborne biological particle in substantially real-time.

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