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Göran Frank

Studierektor forskarutbildning

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Characterisation of a unipolar charger for droplet aerosols of 0.1-20 mu m in diameter

Författare

  • Göran Frank
  • S-I Cederfelt
  • Bengt Martinsson

Summary, in English

A charging unit for unipolar charging of cloud and fog droplets has been developed and calibrated regarding ion current, angular distribution of ions, mean droplet charge and droplet charge distribution. The charger is part of the droplet aerosol analyser, which is an instrument used for characterisation of droplets and interstitial particles in atmospheric clouds and fog. Three different calibration methods have been used for the charge calibration, whereof the third and newest method makes use of a differential mobility analyser, especially developed for large particles, up to at least 20 mum in diameter. The number of charges acquired is a strictly increasing function of the droplet diameter. Two charging models have been used for comparisons with the measurements and both models show good agreement with the data regarding the size dependency of the charge level. Both models can thus be used to describe the performance of the charger. (C) 2003 Elsevier Ltd. All rights reserved.

Avdelning/ar

  • Kärnfysik

Publiceringsår

2004

Språk

Engelska

Sidor

117-134

Publikation/Tidskrift/Serie

Journal of Aerosol Science

Volym

35

Issue

1

Dokumenttyp

Artikel i tidskrift

Förlag

Elsevier

Ämne

  • Subatomic Physics

Nyckelord

  • DAA
  • unipolar charging
  • Droplet Aerosol Analyser
  • fog
  • cloud droplet
  • droplet

Status

Published

Forskningsgrupp

  • Aerosol, Nuclear Physics

ISBN/ISSN/Övrigt

  • ISSN: 0021-8502