Electricity: measuring and testing – Using ionization effects – For analysis of gas – vapor – or particles of matter
Patent
1994-12-02
1996-07-30
Wieder, Kenneth A.
Electricity: measuring and testing
Using ionization effects
For analysis of gas, vapor, or particles of matter
324455, 73 2802, G01N 2762, G01N 2768
Patent
active
055415199
ABSTRACT:
A pulsed rare gas photoionization detector apparatus is set forth and incorporates a closed chamber for receiving a carrier gas flowing there through between inlets and outlets, and the carrier gas is exposed to a pair of electrodes forming a spark across the chamber and through the carrier gas. One component of the carrier gas is a dopant which selected from a plurality of rare gases. The sample to be analyzed is injected into the closed chamber where it commingles with the carrier gas. One reaction involves the formation of selected dopant in an excited state, which upon decay, serves as a source of ionizing radiation which reacts with sample compounds producing detectable events. These events are used to identify and quantify unknown compounds contained in the sample. The methods and apparatus are especially useful in selectively ionizing the compounds to be measured while not ionizing other constituents of the sample. This greatly enhances the signal-to-noise ratio for detecting impurity compounds. As an example, when the detection system is used to monitor air quality, the major constituents of air are not ionized.
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Stearns Stanley D.
Wentworth Wayne E.
Do Diep
Wieder Kenneth A.
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