Extended detection zone in an ionization detector

Details Extended detection zone in an ionization detector Extended detection zone in an ionization detector

1998-04-30

2000-08-22

Brown, Glenn W.

Electricity: measuring and testing

Using ionization effects

For analysis of gas, vapor, or particles of matter

324459, 324469, 324468, 250384, 73 2802, G01N 2762, G01N 3700, G01T 118

Patent

active

061078050

ABSTRACT:
An ionization detector for detection of an analyte includes a source chamber having a source of ionizing particles and receiving a fluid stream of detector gas; an ionization chamber connected to the source chamber at an ionization chamber entrance therebetween so as to allow metastables and photons to be generated in the source chamber and to be transferred in the fluid stream to the ionization chamber; a signal electrode assembly located in the ionization chamber; and a signal measuring circuit for measuring ionized analyte molecules. The signal electrode assembly includes a spaced array of electrodes including a collector electrode, a first signal electrode, and a second signal electrode. The first signal electrode is situated immediately downstream from the ionization chamber entrance and substantially upstream of the collector electrode, so as to extend the detection zone to the vicinity of the ionization chamber entrance.

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