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Published February 1990 | public
Journal Article

Scanning Electrical Mobility Spectrometer


The measurement of particle size distributions using electrical mobility can be accelerated significantly by an alternate mode of operating mobility instruments. Rather than changing the electric field in discrete steps to select particles in a given mobility range, the electric field can be scanned continuously. The particles are classified in a time-varying electric field, but for an exponential ramp in the field strength there remains a one-to-one correspondence between the time a particle enters the classifier and the time it leaves. By this method, complete scans of mobility with as many as 100 mobility measurements have been made in 30 seconds using a differential mobility classifier with a condensation nuclei counter as a detector.

Additional Information

© 1990 Elsevier Science Publishing Co., Inc. Received 31 March 1989; accepted 20 November 1989. The authors gratefully acknowledge many discussions with John Seinfeld that assisted in this research. Important suggestions were also made by Dr. William Hoppel of the Naval Research Laboratories. This research has been performed with support from the Coordinating Research Council.

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