Abstract
A fast approach to calculate scanning differential mobility analyzer (DMA) transfer functions is introduced. The trajectory-based approach of Dubey and Dhaniyala (2008, Analysis of Scanning DMA Transfer Function. Aerosol Sci. Technol., 42:544–555) is extended to determine mobility-based transfer functions of diffusional particles in scanning DMAs. The mobility-based transfer functions are obtained from the transformation of calculated arrival-times of the particles of a selected mobility, i.e., the arrival-time transfer function (ATF). The ATFs are calculated from Monte Carlo simulations of the motion of particles of different diameters, under a range of DMA operating conditions. The results suggest that the nondiffusional ATFs for up-scan operation can be approximated as triangular in shape and the diffusional ATFs as Gaussian. The simulation results show that for high-voltage operation, the effect of fast scanning determines the measurement resolution, while for low-voltage operation, the effect of diff...
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