DEVELOPMENT OF AEROSOL CHARGE ANALYZER
Special technical rept. no. 11, Jul 1965-Sep 1966
STANFORD RESEARCH INST MENLO PARK CA
Pagination or Media Count:
A technique was developed for measuring electrical mobility distribution of an aerosol and average effective size at each mobility level. An aerosol is passed through a purifier and a narrow mobility channel. The purifier removes charged particles from all but a thin central stream that enters the mobility chamber halfway between electrodes. Particles are deposited on an insulating surface according to their mobility. Total charge distribution on the walls was determined by a special scanning probe mass distribution was determined by chemical or colorimetric analysis. Tests to determine mobility distribution of a uranine aerosol generated by atomizing and evaporating a dilute water solution yielded fairly consistent results. Results were consistent with expected magnitudes average particle diameter volume-to-diameter mean was 0.8 micron, and particle charge levels ranged from 0.05 to 1 voltmicron specific particle surface gradient. Remaining problem areas are listed and suggestions are given for improving the technique and extending its usefulness.
- Test Facilities, Equipment and Methods