Micro corona based particle steering air filter

Beelee Chua, Anthony S. Wexler, Norman C. Tien, Debbie A. Niemeier, Britt A. Holmén

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


We have successfully demonstrated a micro corona-based air filter that operates by charging air particles and electrostatically steering them to the exhaust outlet. The filter consists of a corona ionizer, a pair of steering electrodes and a flow divider. Analytical calculations indicated that as the steering voltage increases, the number of particles exiting the waste outlet will increase and those at the filtered outlet will decrease accordingly. In the experiment, ambient air was pumped into the filter element at a rate of 1.28 LPM and the corona ionizer was operated at 1.3 kV. Custom Faraday Cups were connected at both the exhaust and filtered outlets. As the steering voltage increased from 0 V to 5 V, the electrical current measured at the exhaust outlet increased from 6.0 pA to 9.1 pA, while that at the filtered outlet decreased from 5.8 pA to 1.4 pA. Further increase in steering voltage resulted in particle contact with the steering electrode. The Faraday cup current at the exhaust outlet also increased with flow rate. Applications include a miniaturized high efficiency low power air filtration system for respirators.

Original languageEnglish (US)
Pages (from-to)8-15
Number of pages8
JournalSensors and Actuators, A: Physical
StatePublished - 2013


  • Corona
  • Electrostatic steering
  • Filtering facepiece respirator
  • Filtration

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials
  • Metals and Alloys
  • Surfaces, Coatings and Films
  • Instrumentation


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