| 摘要 |
A device (1,2) for characterizing a size distribution of electrically-charged particles in an air flow (50), comprising: a particle charging unit (60), a parallel arrangement of a first measurement section (10) and a second measurement section (20), located downstream from the particle charging unit (60), and a data evaluation unit (40), wherein the first measurement section (10) comprises: a first particle sensing unit (11) arranged to precipitate substantially all entering electrically-charged particles, and to generate a first output signal (41), the second measurement section (20) comprises: a second particle sensing unit (21) arranged to precipitate at least part of all entering electrically-charged particles, and to generate a second output signal (42), and a first particle precipitation unit (22) arranged to partially reduce the concentration of electrically-charged particles having a size larger than a first particle size limit, the data evaluation unit (40) for calculating a particle number concentration and an average diameter based on first and second output signals.
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