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Method and apparatus for discriminating minute particles

  • US 4,778,593 A
  • Filed: 04/28/1986
  • Issued: 10/18/1988
  • Est. Priority Date: 03/25/1983
  • Status: Expired due to Fees
First Claim
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1. A method of discriminating minute particles, comprising the steps of:

  • producing a stream of minute particles, in which substantially each of said minute particles is separated from the adjacent particle with an interval, from a suspension of said minute particles;

    irradiating said produced stream of minute particles with high-intensity light pulses directed from a light source through a cavity dumper for controlling the number of light pulses;

    detecting the intensity of light emission from said irradiated particles by a streak camera;

    discriminating the particles in said stream by the intensity of light emission from said irradiated particles; and

    changing said irradiated stream of minute particles into a sequence of droplets;

    wherein said discrimination is carried out on the basis of characteristics of the change, with time, of the intensity of said light emission, represented by at least one of a rise time of the emitted light, an attenuation time of the emitted light and an orientation relaxation time, using the result of the detection of the intensity of light emission from said irradiated particles by the streak camera.

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