Corona-Imaging Colorimetric Method for Accurate Measurement of the Size of Water Droplets in an Expansion Chamber

被引:0
|
作者
Aoki, Hiroka [1 ]
Moteki, Nobuhiro [1 ]
Kondo, Yutaka [1 ]
机构
[1] Univ Tokyo, Grad Sch Sci, Dept Earth & Planetary Sci, Bunkyo Ku, Tokyo 1130033, Japan
基金
日本科学技术振兴机构;
关键词
LIGHT-SCATTERING; MIE SCATTERING; AEROSOL DROPLETS; IRIDESCENCE; COLOR;
D O I
10.1080/02786826.2013.824550
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Accurate and time-resolved measurement of the size of water droplets is a prerequisite for the study of the microphysical processes of cloud formation by using an expansion chamber. We developed a droplet sizing method that uses color images of coronae observed under illumination of a white-light beam, also known as the corona-imaging colorimetry (CIC) method. In the CIC method, RGB data from images obtained by a commercial digital camera are converted into standard colorimetric parameters. The droplet size is estimated by optimizing the agreement of the measured colorimetric parameters with those estimated from Mie theory. For polystyrene latex spheres suspended in water, the particles size estimated by the CIC method agrees to within 2% of the predetermined value. We apply this method to the time-resolved measurement of the size of water droplets formed in an expansion chamber. The CIC method is technically simple and enables accurate and instantaneous measurements of the size of droplets with diameters larger than about 10m, which is the typical size of cloud droplets that form in the atmosphere. Copyright 2013 American Association for Aerosol Research
引用
收藏
页码:1134 / 1143
页数:10
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