Optimization of charge neutralization based on computer simulation

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Phenomena of charge neutralization with several types of ionizers were investigated on the basis of a 2D-electrohydrodynamic modeling. The results obtained could explain how practical troubles occur. It was found that any spatiotemporal charge due to unbalance in positive and negative ion densities yields an offset voltage on an object to be neutralized. For optimum neutralization, quasi-neutralized distribution in all regions is of great importance ; therefore, ionizers with an ion source having quasi-neutralized charge densities are necessary. In addition, a modified method to get zero offset voltage for AC and pulse-DC ionizers was proposed.