Design and Performance Evaluation of Electrical Impactor for Nano Environmental Aerosols

나노 환경입자 측정용 전기적 임팩터의 설계 및 성능평가

  • 지준호 (연세대학교 나노과학기술연구단) ;
  • 조명훈 (연세대학교 기계공학과) ;
  • 배귀남 (한국과학기술연구원 지구환경연구센터) ;
  • 황정호 (연세대학교 기계공학과)
  • Published : 2003.04.23


An electrical cascade impactor is a multistage impaction device to separate airborne particles into aerodynamic size classes using electrical method. We designed a real-time three-stage electrical low-pressure impactor, which is proper to nanometer sized environmental aerosols. Performance evaluation was carried out for stage 1 and 2. The monodisperse liquid dioctyl sebacate (DOS) particles were generated using condensation-evaporation followed by electrostatic classification using DMA (differential mobility analizer) for particles with diameters in the range of $0.04{\sim}0.8{\mu}m$. The evaluation of the electrical impactor is based on the use of two electrometers, one connected to the impaction plate of the impactor, and the other to the faraday cage as backup filter. The results showed that the experimental 50% cutoff diameters in the operation pressure were 0.53 and $0.12{\mu}m$ for stage 1 and stage 2. The effect of operation pressure on the cutoff diameter and the steepness of collection effcieicy curves is investigated.