AAAR 34th Annual Conference
October 12 - October 16, 2015
Hyatt Regency
Minneapolis, Minnesota, USA
Abstract View
Development and Evaluation of New Hy-NPS
Kang-Ho Ahn, HONG-KU LEE, Gun-Ho Lee, Hee-Ram Eun, Yong-Hee Park, Jinhong Ahn, Hanyang University, R. of Korea
Abstract Number: 591 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. Long scanning time is not adequate for measuring unsteady particle concentration condition. 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). They tried to improve DMA performance by increasing the number of sampling port. However, It necessarily needs excessive longitudinal extension of DMA and many commercial CPCs along with sampling ports. Then, it makes the system complicated and larger.
In this study, we developed a Hanyang nano-particle sizer (Hy-NPS) with no scanning time and relatively compact size to measure real-time particle size distribution. This system consists of multi-condensation particle counter (M-CPC), which has its own condenser and saturator, and multi-port DMA (MP-DMA), which has a variable cross sectional area electrode. We also performed an evaluation of the system using mono-dispersed particle. Then, the system performance is compared with the SMPS (TSI 3776 with customized standard DMA). The performance test was conducted under steady and unsteady particle concentration conditions.
As a result of this research, it is considered that Hy-NPS is more suitable for measuring rapidly changing aerosol concentrations than SMPS.
Acknowledgements: This research is supported by Korea Ministry of Environment as “The Eco-Innovation project”.