Discharge ionization current detector and method for aging treatment of the same

摘要

An aging treatment is performed by using cleaning gas obtained by mixing inert gas, as an impurity, to plasma gas. Plasma generation by dielectric-barrier discharge is performed until a predetermined period of time has elapsed by applying high AC voltage to an electrode while supplying the cleaning gas to a dielectric tube from a gas inlet.

主权项

1. A method for aging treatment of a discharge ionization current detector including: a plasma generation section that is configured of a dielectric tube and a plurality of electrodes attached on an outer circumference of the dielectric tube, the plasma generation section continuously generating dielectric-barrier discharge inside the dielectric tube by applying high AC voltage to the electrodes while causing plasma gas to flow through the dielectric tube; a sample ionization section that is connected to a downstream end of the dielectric tube and that ionizes components in sample gas by light at a time of discharge generation at the plasma generation section; and an ion detection section that detects a sample component ionized by the sample ionization section, the method comprising:
supplying, as cleaning gas, mixed gas obtained by mixing inert gas with greater atomic weight than the plasma gas in the plasma gas, to the dielectric tube; and continuously generating the dielectric-barrier discharge over a predetermined period of time by the plasma generation section while supplying the cleaning gas.