PHOTOELECTRIC METHOD OF DETERMINING SIZE AND CONCENTRATION OF SUSPENDED PARTICLES Russian patent published in 2014 - IPC G01N15/02 

FIELD: measuring equipment.

SUBSTANCE: method of determining the size and concentration of suspended particles comprises probing the flow of the medium under study with the light beam, as well as the registration of signals of probing beam interaction with the particles. Also, the method comprises measuring the amplitude and number of photoelectric pulses of these signals, according to which the size and concentration of particles are respectively determined. At that the flow of photoelectric pulses is subjected to primary amplitude discrimination with upper and lower thresholds, and then pulse selector provides the passage of pulses with a duration exceeding a certain threshold, the device of correction of multiple coincidences subjects the photoelectric pulses to the forced interruption through the time equal to the duration of the particles flight through the counting volume. The photoelectric pulses are subjected to forced interruption through the time equal to the duration of the particles flight through the counting volume and depending on the pulses coming to the PC, the blower and the duration of pulse of forced interruption is operated, as well as the amplitude of the laser radiation and the upper threshold level of the amplitude discrimination.

EFFECT: improving the accuracy of measurement of concentration and size of the particles.

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