Method and an apparatus for an air sample analysis

Details Method and an apparatus for an air sample analysis Method and an apparatus for an air sample analysis

1995-07-31

1996-12-24

Anderson, Bruce C.

Radiant energy

Ionic separation or analysis

Ion beam pulsing means with detector synchronizing means

250282, B01D 5944, H01J 4900

Patent

active

055875815

ABSTRACT:
In an apparatus for an air sample analysis, employing a dual polarity Ion Mobility Spectrometer (IMS), a method for stabilizing equilibrium conditions associated with the switching of the electric fields in the IMS cell comprises the steps of modulating a duty cycle of the electric field at the shutter grid located between the reactor region and the drift region of the IMS cell. During the switching of the electric fields at the cell, the open time of the duty cycle of the electric field at the shutter grid is extended. After the background polarity has been switched to the opposite polarity, the open time is returned to its normal value.

REFERENCES:
patent: 4855595 (1989-08-01), Blanchard
patent: 5109157 (1992-04-01), Loen

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