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Particle counting method

  • US 8,497,989 B2
  • Filed: 11/30/2011
  • Issued: 07/30/2013
  • Est. Priority Date: 11/30/2010
  • Status: Active Grant
First Claim
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1. A method of particle counting, the method comprising:

  • irradiating a sample gas with a light;

    detecting a scattered light from a particle included in the sample gas by a photoelectric conversion device;

    counting a number of the particles of every particle size division by an output voltage wave pattern of the photoelectric conversion device; and

    calculating, with a Digital Signal Processor (DSP), a time difference (Ta−

    T1) with a point (T1) of a peak of output voltage wave pattern and a point (Ta) of a falling detection threshold (A), when the time difference (Ta−

    T1) exceeds a counting cancellation time (B), the output voltage wave pattern is not counted as a particle.

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