A novel piezoelectric plasma generator developed by TDK Electronics GmbH & Co OG, the CeraPlas®, was investigated for its feasibility as a charger for aerosol particles. The CeraPlas® charger was directly compared to a commercially available bipolar X-ray charger regarding its efficiency of charging atomized NaCl particles in a size range from 30nm–100nm. First results show the ability of the CeraPlas® to perform bipolar aerosol charging with high reproducibility, and measurements of the charge distribution in the Nit product yielded about E12/m3s for our experimental charging configuration. Unwanted generation of ozone was suppressed by a dedicated charging chamber and operation in N2 atmosphere.
The introduction of particle number (PN) emission limits in periodical technical inspection for passenger cars leads to the need of PN measurements for any individual car. Besides the need for measurement devices, a fast and simple PN calibration method to allow for high-throughput calibration is key. In this work we present such a calibration method to evaluate the linearity and the plateau counting efficiency region of a PN counter is on-site.
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