Patent ID: 9606038
Date: 2017-03-28
CPC Classifications: B03C,G01N

Claim:
1. A particle count measurement device for measuring a particle count concentration of an aerosol flowing through a measurement region, the particle count measurement device comprising: a preprocessing section configured to introduce the aerosol into the measurement region in an electrical state of a positively charged state or a negatively charged state; a unipolar charging section inside the measurement region, the unipolar charging section being configured to place the introduced aerosol in a positively charged state or a negatively charged state that is an electrical state different from at a time of introduction into the measurement region; an ion trap arranged inside the measurement region, on a downstream of the unipolar charging section in terms of a flow of the aerosol, the ion trap including an ion trap electrode for generating an electric field that draws only gas ions in the aerosol; an exhaust mechanism outside the measurement region, the exhaust mechanism being configured to discharge the aerosol from the measurement region at a constant flow rate; and an ammeter for detecting, wherein the ammeter measures a difference between a current value of charged particles entering the unipolar charging section and a current value of charged particles flowing through the unipolar charging section and the ion trap and leaving the ion trap, and wherein the measured values correspond to the particle count concentration.