Drift tube structure for ion mobility spectrometer

Details Drift tube structure for ion mobility spectrometer Drift tube structure for ion mobility spectrometer

2008-12-23

2011-12-13

Johnston, Phillip A (Department: 2881)

Radiant energy

Ionic separation or analysis

With sample supply means

C250S286000, C250S287000

Reexamination Certificate

active

08076638

ABSTRACT:
A drift tube structure for ion mobility spectrometer is disclosed comprising electrode sheets and insulation parts arranged in alternation, with each electrode sheet being a mesh metal sheet having a radian or taper portion which is convexly curved toward an ion input. Further, the radian or taper portion of the electrode sheet has meshes of higher transparency. With the above structure of the present invention, an electric field having a periphery of uniform focusing center can be formed in the migration zone. The circular ring configuration of the electric field periphery can shield the migration electric field from any influence of external electric fields. The electrodes are each meshlike and have a circular hole at the center, thus they can focus and collect as many as possible ions that do not move along the central axis, and those ions moving along the central axis can pass through the electrodes transparently.

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Office Action issued in the corresponding German application No. 102008064130.8 with English translation of the German Office Action, Jan. 19, 2011.

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