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Published October 2000 | public
Journal Article

The scanning flow DMA


A new method of DMA operation has been implemented in which the flow rates are continuously changed in conjunction with the applied voltage. By optimizing the flow and voltage ramps, improvements can be made in the DMA's measurable size range, counting statistics, resolution, or a partial combination of each of these. Detailed modeling of this technique suggests that errors on the order of 2 to 5% result from incorrect assumptions concerning the flow profile within the DMA. The experimental system enabled accurate control of flows that were varied by an order of magnitude in as little as 30 s. Excellent agreement was obtained between mobility distributions recovered from a voltage ramp, a flow ramp, and a combined voltage and flow ramp. Slight deviations were apparent in the recovered data as the flow scan time was reduced from 60 to 30 s.

Additional Information

© 2000 Elsevier. (First received 25 February 1999; and in final form 3 December 1999) The authors gratefully acknowledge the assistance of Jian Wang, Patrick Chuang, and Jim Smith for their help in the construction and implementation of this measurement system. This work has been supported by the National Science Foundation Grant ATM-9614105, and by the Office of Naval Research Grant N00014-91-0119.

Additional details

August 19, 2023
October 23, 2023