Yli-Ojanperä, Jaakko; Ukkonen, Ari; Järvinen, Anssi; Layzell, Steve; Niemelä, Ville; Keskinen, Jorma
Bipolar Charge Analyzer (BOLAR): A new aerosol instrument for bipolar charge measurements
Teil von
  • Journal of aerosol science, November 2014, Vol.77, pp.16-30
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The Bipolar Charge Analyzer (BOLAR, Dekati Ltd.) is a new commercial instrument developed to characterize bipolar charge and charge-to-mass ratio of powders and inhaled aerosols as a function of particle size. The instrument combines aerodynamic size classification with electrostatic precipitator based bipolar charge measurement. As a result bipolar charge and charge-to-mass ratios are obtained for 5 size fractions between zero and 11.6µm. In this study we present the operation concept, design and the performance characteristics of the BOLAR. The instrument was calibrated using monodisperse particles in laboratory conditions. The performance of the instrument in inhaler measurement was tested by measuring aerosol produced by a dry powder inhaler (DPI). The DPI was found to produce noticeable levels of positively and negatively charged particles. For a single size fraction the largest observed positive and negative values were +300pC and −200pC, respectively, although the net charge...
ISSN: 0021-8502
ISSN: 1879-1964
DOI: 10.1016/j.jaerosci.2014.07.004

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