MEASUREMENT METHODS FOR ELECTRIC CHARGES ON AEROSOLS

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Abstract
The electric charge of aerosol particles can be determined by measuring the electrical mobility and the diameter of the particle. In electrostatic elutriators the aerosol flows through a duct in which an electric field is maintained and particles are removed by deposition on to the wall due to electrical forces. In electrostatic spectrometers only a small amount of aerosol is added to a flow of particle-free gas in the duct. Particles have unique trajectories according to their electrical mobility. Electrostatic elutriators are handy for industrial applications. Particle sizes are usually measured by size-discriminating optical particle counters. Electrostatic and electrodynamic particle balances and also sensitive electrometer methods can be employed for measuring the particle charge without the use of the electrical mobility, but the application of these methods is limited to laboratory measurements.

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