Ks. Seol et al., A differential mobility analyzer and a Faraday cup electrometer for operation at 200-930 Pa pressure, J AEROS SCI, 31(12), 2000, pp. 1389-1395
We have developed a differential mobility analyzer (DMA) based on the DMA d
evised by Seto et al. (1997) and a Faraday cup electrometer for measurement
of nanometer-sized particles at a few hundred Pa and examined the operatin
g characteristics of the DMA using the tandem DMA technique. The tandem DMA
calibration establishes that the DMA successfully classifies particles in
the 200-930 Pa pressure range. It was also found that the transfer function
of the DMA follows the triangular transfer function and the resolution of
the DMA is close to that given for an ideal case. As a standard of a minimu
m pressure that may be probed with the present DMA system, 400 Pa is estima
ted when the DMA operates with a 3 nl min(-1) sheath flow and a 1 nl min(-1
) aerosol flow rate. (C) 2000 Elsevier Science Ltd. All rights reserved.