Development of a cloud condensation nuclei(CCN)counter using a laser and charge-coupled device(CCD)camera

作     者：Mikyung PARK Jinkwan OH Kihong PARK 

作者机构：School of Environmental Science and EngineeringGwangju Institute of Science and TechnologyGwangju 500-712The Republic of Korea 

出 版 物：《Frontiers of Environmental Science & Engineering》 (环境科学与工程前沿（英文）)

年 卷 期：2011年第5卷第3期

页      面：313-319页

核心收录：

学科分类：07[理学] 070202[理学-粒子物理与原子核物理] 0702[理学-物理学] 

基　　金：The research described in this paper was supported by the National Research Foundation of Korea(NRF)Grant Funded by the Korean Government(MEST)(NRF-2011-0015548 and NRF-2010-013-D00034) 

主　　题：aerosol cloud condensation nuclei(CCN)counter ultrafine particle 

摘      要：A continuous flow streamwise thermal gradientcloud condensation nuclei(CCN)counter with anaerosol focusing and a laser-charge-coupled device(CCD)camera detector system was developed *** countingperformance of the laser-CCD camera detector system wasevaluated by comparing its measured number concentrationswith those measured with a condensation particlecounter(CPC)using polystyrene latex(PSL)and NaClparticles of varying *** CCD camera parameters(***,gain,gamma,and exposure time)wereoptimized to detect moving particles in the sensing volumeand to provide the best image to count *** CCNcounter worked well in the particle number concentrationrange of 0.6-8000#·cm^(-3)and the minimum detectablesize was found to be 0.5μ*** supersaturation in theCCN counter with varying temperature difference wasdetermined by using size-selected sodium chloride particlesbased on Köhler *** developed CCNcounter was applied to investigate CCN activity ofatmospheric ultrafine particles at 0.5%*** showed that CCN activity increased with increasingparticle size and that the higher CCN activation forultrafine particles occurred in the afternoon,suggesting thesignificant existence of hygroscopic or soluble species inphotochemically-produced ultrafine particles.