Particle counting method

Details Particle counting method Particle counting method

2008-04-04

2010-06-08

Toatley, Jr., Gregory J (Department: 2877)

Optics: measuring and testing

By particle light scattering

C356S335000, C356S336000

Reexamination Certificate

active

07733487

ABSTRACT:
A particle counting method is provided whereby a liquid sample is radiated by a laser light, scattered light produced by causing the laser light to hit a particle in the liquid sample is detected by a photoelectric conversion element, and a sample value which is the output of the photoelectric conversion element is sequentially compared to a threshold preset for each particle size range, thereby counting the number of particles for each particle size range, the method comprising: a timer start-up step for starting a timer of a predetermined time when the sample value becomes smaller than a threshold of a minimum particle size for the first time and for sequentially holding the maximum value of the sample value; and a timer extension step for restarting the timer to sequentially hold the maximum value of the sample value when the sample value at the time-out of the timer start-up step is larger than the threshold of the minimum particle size.

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