Patent ID: 9534998
Date: 2017-01-03
CPC Classifications: B03C,G01F,G01N,G06F

Claim:
1. A size-classified particle size distribution measuring method comprising: (A) a step of, when a sample fluid containing charged aerosol particles and a clean fluid comprised of clean air are made to flow in a predetermined electric field and when the charged aerosol particles are classified in the electric field based on electrical mobility by using a Differential Mobility Analyzer, calculating a ratio of flow rate necessary for increasing accuracy of the classification, the ratio of flow rate being a ratio between a flow rate of the sample fluid and a flow rate of the clean fluid, the step comprising: (B) a step of putting aerosol particles into a charged equilibrium state; (C) a step of classifying the aerosol particles charged in the step (B) in the predetermined electric field based on the electrical mobility while making the sample fluid containing the aerosol particles charged in the step (B) and the clean fluid comprised of clean air flow in the electric field based on the ratio of flow rate calculated in the step (A), the step (C) being a step of initially setting a reference voltage supplied to form the electric field to the voltage value U used for classifying aerosol particles with a predetermined particle size whose number of charges is 1, and executing a first classifying of the aerosol particles under the supplied voltage having the initially set voltage value U; (D) a step of measuring the aerosol particles classified out in the step (C), by an electrical or/and optical measuring method and outputting a result of the measurement as a first measurement result M (E) a step of re-setting the voltage supplied to form the electric field, and supplying the voltage having the re-set voltage value to execute re-classifying of the aerosol particles, the step comprising: