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

doi:10.1007/s11783-011-0346-y

Front Envir Sci Eng Chin

2011, Vol. 5

Issue (3) : 313-319 https://doi.org/10.1007/s11783-011-0346-y

RESEARCH ARTICLE

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

Mikyung PARK, Jinkwan OH, Kihong PARK(

)

School of Environmental Science and Engineering, Gwangju Institute of Science and Technology, Gwangju 500-712, The Republic of Korea

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Abstract

A continuous flow streamwise thermal gradient cloud condensation nuclei (CCN) counter with an aerosol focusing and a laser-charge-coupled device (CCD) camera detector system was developed here. The counting performance of the laser-CCD camera detector system was evaluated by comparing its measured number concentrations with those measured with a condensation particle counter (CPC) using polystyrene latex (PSL) and NaCl particles of varying sizes. The CCD camera parameters (e.g. brightness, gain, gamma, and exposure time) were optimized to detect moving particles in the sensing volume and to provide the best image to count them. The CCN counter worked well in the particle number concentration range of 0.6–8000 #·cm^-3 and the minimum detectable size was found to be 0.5 μm. The supersaturation in the CCN counter with varying temperature difference was determined by using size-selected sodium chloride particles based on K?hler equation. The developed CCN counter was applied to investigate CCN activity of atmospheric ultrafine particles at 0.5% supersaturation. Data showed that CCN activity increased with increasing particle size and that the higher CCN activation for ultrafine particles occurred in the afternoon, suggesting the significant existence of hygroscopic or soluble species in photochemically-produced ultrafine particles.

Keywords aerosol cloud condensation nuclei (CCN) counter ultrafine particle

Corresponding Author(s): PARK Kihong,Email:kpark@gist.ac.kr

Issue Date: 05 September 2011

Cite this article:

Mikyung PARK,Jinkwan OH,Kihong PARK. Development of a cloud condensation nuclei (CCN) counter using a laser and charge-coupled device (CCD) camera[J]. Front Envir Sci Eng Chin, 2011, 5(3): 313-319.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-011-0346-y
https://academic.hep.com.cn/fese/EN/Y2011/V5/I3/313

Fig.1 Schematic of CCN counter system

Fig.2 CCD camera parameters adjusted to provide best particle image, (a) exposure time= 100 μs; (b) gamma= 700; (c) gain= 900

Fig.3 Comparison of the CPC and CCN number concentrations of 1.07 μm PSL particles in the concentration ranges of (a) 20-25000 #·cm; (b) 20-8000 #·cm; and (c) 20-25000 #·cm diluted by a factor of about 4

Fig.4 Comparison of the CPC and CCN number concentrations of PSL particles of varying sizes (0.5-10 μm)

Fig.5 CCN/CN values of NaCl particles of different sizes at varying temperature differences

Fig.6 Comparison of the CPC and CCN number concentrations of 170 nm NaCl particles at 0.3% (Δ= 5K) supersaturation

Fig.7 CCN/CN ratio of 50, 100, 163, and 200 nm atmospheric particles sampled at urban Gwangju, Korea on 23 November, 2009

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