Abstract: A static electricity removal device that removes static electricity by supplying positive and negative ions to a target of static electricity removal, comprising a surface potential measuring probe that measures a surface potential of the target of static electricity removal, wherein a potential detector (11a) that constitutes a surface potential measuring probe (11) and a conductive cap (13) placed so as to surround the potential detector (11a) in a non-contact state are provided and a potential generated in the cap (13) by charges of a target of static electricity removal (30) or ions supplied from a static electricity removal device (20) is detected by the potential detector (11a) and sent out to a control circuit (24) within the static electricity removal device (20) as a feedback signal.

Abstract: A neutralization apparatus 1 according to the present invention is a DC gas injection type neutralization apparatus which efficiently neutralizes a large subject to be neutralized at high speed without generating reverse electrification. Gas injection ports 60 are formed between plus electrodes 20 and minus electrodes 30. The plus electrodes 20 and the minus electrodes 30 respectively emit plus ions and minus ions toward gas flows from the gas injection ports 60, and the plus ions and minus ions reach the subject to be neutralized at high speed and neutralize the same.