Virtual wall gas sampling for an ion mobility spectrometer

Details Virtual wall gas sampling for an ion mobility spectrometer Virtual wall gas sampling for an ion mobility spectrometer

2005-05-03

2005-05-03

Lee, John R. (Department: 2881)

Radiant energy

Ionic separation or analysis

C250S288000, C250S287000, C250S290000, C250S294000

Reexamination Certificate

active

06888128

ABSTRACT:
The presence of trace molecules in air may be determined using an ion mobility spectrometer. Such devices may be used in the fields of explosives detection, identification of narcotics, and in applications characterized by the presence of very low airborne concentrations of organic molecules of special interest. The sensitivity of such instruments may depend upon on the method of gas sampling utilized. A virtual wall gas sampling system can greatly improve the sampling efficiency, particularly when the sampling needs to be performed at a distance from the air intake and large volumes need to be sampled. The virtual wall gas sampling system consists of an intake gas flow and a separate group of one or more sheet-like gas flows, which may be either mutually deflected to move with a circular motion or may be formed into a cylindrical bounding surface.

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