A Method for Measuring Particle Charge by Its Induced Current

Abstract

The electrical charge on a moving single particle in the air can be determined by integrating its induced current on a measuring electrode with time. In this experiment, a circular plate and a sphere are used for the measuring electrode. For the sample particle, a charged water droplet is produced from a fine tube where high voltage is directly applied in order to obtain a certain constant value of electrical charge.
Judging from the good agreement with the experimental data measured by the Faradaycage method, it is considered that the proposed method should be applicable to measurement of particle charge.