Abstract
It is well known that the second order differential mobility analyzer is an excellent apparatus. In this apparatus, we can expect to obtain mobility distributions with good resolusion and to reduce the errors involved in the data analysis process.
For these reasons, we developed a new differential mobility analyzer of second order. This analyzer was constructed to scan the mobility range from 3×10-4 to 5×10-2cm2/v•sec, which corresponds to the size range of 4×10-7 to 4×10-6cm in radius.
In this apparatus, the mobility resolution is determined by four factors; the flow rates of filtered clean air and aerosol sample air, and the lengths of the first and second inner electrode. The resolution of the present analyzer was about 0.4.
In this paper, we present the principle of the measurement of mobility distribution and experimental set-up of the analyzer, together with some examples of the mobility distribution and aerosol size distribution.
