System for detecting compounds in a gaseous sample by measuring photoionization and electron capture induced by spark excitation of helium

  • US 5,394,091 A
  • Filed: 02/25/1994
  • Issued: 02/28/1995
  • Est. Priority Date: 02/28/1991
  • Status: Expired due to Term
First Claim
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1. A charged particle detector comprising:

  • (a) a closed chamber having an inert gas flow inlet and spaced outlet to enable gas flow therethrough;

    (b) spark forming electrodes cooperating with a pulsed DC current source thereby forming a spark sufficient to enable an electrical arc to be formed between said electrodes defining the spark thereacross, said electrodes being positioned in said chamber to form a spark gap across inert gas flow through said chamber;

    (c) spaced detector means downstream in said chamber for collection of current formed as a result of the spark across the gap wherein the inert gas flow moves toward said detector means and a current is formed indicative of eluted sample concentration introduced, from an external source, into said chamber downstream from said spark forming electrodes;

    (d) a voltage source connected to said detector means to provide a controlled voltage thereto for enabling said detector means for current detection; and

    (e) wherein the detector means quantifies the eluted sample in said chamber by measuring said detected current.

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