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

Frank, Göran LU ; Cederfelt, S-I and Martinsson, Bengt LU (2004) In Journal of Aerosol Science 35(1). p.117-134
Abstract
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... (More)
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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
DAA, unipolar charging, Droplet Aerosol Analyser, fog, cloud droplet, droplet
in
Journal of Aerosol Science
volume
35
issue
1
pages
117 - 134
publisher
Elsevier
external identifiers
  • wos:000187794700009
  • scopus:0344825167
ISSN
0021-8502
DOI
10.1016/S0021-8502(03)00384-7
language
English
LU publication?
yes
id
a2dec1fe-76e6-4d39-8c82-61bc4b8304cd (old id 290082)
date added to LUP
2007-10-22 18:49:48
date last changed
2017-01-01 07:19:50
@article{a2dec1fe-76e6-4d39-8c82-61bc4b8304cd,
  abstract     = {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.},
  author       = {Frank, Göran and Cederfelt, S-I and Martinsson, Bengt},
  issn         = {0021-8502},
  keyword      = {DAA,unipolar charging,Droplet Aerosol Analyser,fog,cloud droplet,droplet},
  language     = {eng},
  number       = {1},
  pages        = {117--134},
  publisher    = {Elsevier},
  series       = {Journal of Aerosol Science},
  title        = {Characterisation of a unipolar charger for droplet aerosols of 0.1-20 mu m in diameter},
  url          = {http://dx.doi.org/10.1016/S0021-8502(03)00384-7},
  volume       = {35},
  year         = {2004},
}