期刊名称：IOP Conference Series: Earth and Environmental Science
印刷版ISSN：1755-1307
电子版ISSN：1755-1315
出版年度：2019
卷号：227
期号：6
页码：062040
DOI：10.1088/1755-1315/227/6/062040
出版社：IOP Publishing
摘要：In this study, a mini-Faraday cup for portable ultrafine particle sizer was designed, which consisted of a cylindrical metal case, a filter holder, a Teflon insulator, and an internal metal filter. In order to achieve high particle collection efficiency, a disc structure of metal filter was adopted in the proposed Faraday cup. Moreover, a high sensitive weak current amplifier was used and a spring probe electrode instead of the copper wire connecting between the Faraday cup and the weak current amplifier was used to eliminate the noise generated by vibration. The performance of Faraday cup electrometer was evaluated by a series of experiments. The results of the experiments showed that the current values of 220 nm charged particles for different number concentrations measured by the Faraday cup have good linear correlation, since the Adj. R-Square and the Pearson's correlation coefficient are greater than 0.98 and 0.99, respectively. And the experimental results of the prototype Faraday cup electrometer for particles ranging from 50 to 300 nm agreed well with the theoretical results. The comparative test between the self-developed aerosol electrometer and commercial electrometer were also presented. There was a good linear relationship between the current values measured by the two instruments. The self-developed mini-Faraday cup electrometer had advantages of high particle collection efficiency, small in size and light in weight, which was suitable for the portable measurements of atmosphere ultrafine particle.
