Eric R Lee et al 2004 Metrologia 41 S147 doi:10.1088/0026-1394/41/5/S05
Eric R Lee, Valerie Halyo, Irwin T Lee and Martin L Perl
Show affiliationsAutomated measurements of the electric charge of fluid microdrops precise to up to 0.016 of an electron charge have been made using machine-vision systems to observe the motion of fluid microdrops in air under the influence of an oscillating electric field. The fluid drop diameters have ranged from 7 µm to 25 µm with smaller diameter drops being measured to higher precision. The experimental runs performed for the purpose of attempting to find isolated fractionally electrically charged particles have measured the charges of tens of millions of fluid microdrops using piezoelectrically driven drop-on-demand inkjet-like droplet ejectors as fluid drop sources.
41.20.Cv Electrostatics; Poisson and Laplace equations, boundary-value problems
Issue 5 (October 2004)
Received 23 January 2004
Published 16 September 2004
Eric R Lee et al 2004 Metrologia 41 S147
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