AAAR 33rd Annual Conference
October 20 - October 24, 2014
Rosen Shingle Creek
Orlando, Florida, USA
Abstract View
Development and Evaluation of Real-time Nano-particle Counter
KANG-HO AHN, Hong-Ku Lee, Hanyang University, R. of Korea
Abstract Number: 434 Working Group: Instrumentation and Methods
Abstract Measuring particle size distribution is one of the primary concerns in aerosol studies. For a nano-particle size distribution measurement, many scientists use a combination of a differential mobility analyzer (DMA) and a condensation particle counter (CPC) system, which is a called scanning mobility particle sizer (SMPS). Although it has a very high particle size resolution, some issues still remain. One of a main problem is a long scanning time during the measurement. In particular, long scanning time is not adequate for measuring fast changing particle concentration during the measurement. Previous effort to overcome these problems has been performed by some researchers (Chung et al. 2006; Chen et al. 2007; Kim et al. 2007; Lee et al. 2013).
In this study, we developed a radial exhaust multi-port system (REM-system) with no scanning to measure real-time particle size distribution. This system consists of multi-condensation particle counter (M-CPC) and multi-port DMA (MP-DMA), which has a variable cross sectional area electrode. We also evaluated size distribution of the system using mono-dispersed NaCl particle. The average geometrical standard deviations (σg) of MP-DMA is 1.041, which is considered to be mono-disperse. After the evaluation, the system performance is compared with the commercial SMPS. The performance test was conducted under steady and unsteady particle concentration conditions.
As a result of this research, it is considered that this system is more suitable for measuring rapidly changing aerosol concentrations than SMPS.