Читать книгу The ESD Control Program Handbook - Jeremy M. Smallwood - Страница 78

The ion density in the air typically reduces with the distance from the ionizer. This is in part because the ion cloud tends to spread out due to repulsion forces between like polarity ions. In addition, attraction between positive and negative charges in the cloud causes them to move toward each other and recombine to neutralize each other (Jonassen 2016a).

As the ion cloud is drifting in air, movement of the air can have a significant effect on the location of the cloud and the local ion concentration. Ions can be blown toward or away from the region where they are wanted (e.g. by drafts from a fan or open window). Conversely, in many situations a fan can be used to blow ions to the location they are needed to improve charge neutralization effectiveness.