AAAR 32nd Annual Conference
September 30 - October 4, 2013
Oregon Convention Center
Portland, Oregon, USA
Abstract View
Performance Study of a Miniature, Corona-based Unipolar Aerosol Charger for Compact Particle Sizers
SIQIN HE, Da-Ren Chen, Paul Greenberg, Washington University in St. Louis
Abstract Number: 371 Working Group: Instrumentation and Methods
Abstract As the rising concern of the health effect due to the exposure of ultrafine particles, A low-cost, ultrafine particle sizer enabling to measuring spatial distribution of particles is in high demand. In our group, the low-cost sizers are developed based on the electrical mobility classification technique, of which an aerosol charger is an essential component for each unit. To improve the charging performance while covering the particle size ranging from 10 to 500 nm, a new prototype of miniature unipolar aerosol charger was designed and constructed and in this study.
By challenging the prototype with DMA-classified neutral particles, the extrinsic charging efficiency of the charger was significantly improved by 20% for the whole size range when compared with that developed by Qi et al (2008). And 100% extrinsic charging efficiency for particles was achieved for the sizes larger than 80 nm. The experimental result of this study will be presented in this talk.