Patent ID: 8217365
Filing Date: 2012-07-10
Classification: H01J

Abstract:
1. A dual ion mobility spectrometer comprising: an ion source, a first gate electrode placed on one side of the ion source, wherein a potential at the first gate electrode is higher than a potential at the ion source; a second gate electrode placed on the other side of the ion source, wherein a potential at the second gate electrode is lower than the potential at the ion source; a negative gate placed on the side of the first gate electrode away from the ion source; a positive gate placed on the side of the second gate electrode away from the ion source; a negative drift tube connected with the negative gate; a positive drift tube connected with the positive gate; wherein the ion source is a meshy double-faced ion source, comprising a plate-shaped source body which has radioactivity on both sides and is configured to ionize sample gas to generate positive and negative ions such that the generated positive and negative ions penetrate through the source body; and the source body has a thickness between 0.01 mm and 1 mm.