Laser diode-excited biological particle detection system

  • US 20030098421A1
  • Filed: 11/27/2001
  • Published: 05/29/2003
  • Est. Priority Date: 11/27/2001
  • Status: Active Grant
First Claim
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1. An improved apparatus for identifying the existence of viable biological particles from a particle population containing a mixture of biologically viable and biologically inert particles, the improvement comprising:

  • a solid state excitation source wherein said source is a laser diode for emitting a light beam being directed to contact particles of the particle population and having a wavelength above about 320 nm which is operative to excite biomolecules contained therein to produce fluorescence;

    a photon counter for measuring the intensity of fluorescence emitted from each contacted particle and producing a signal indicative thereof; and

    a microprocessor for comparing each contacted particle'"'"'s fluorescent intensity signal against predetermined criteria and establishing whether that particle is a biologically viable particle or an inert particle.

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