Dielectric barrier discharge ionization detector and method for tuning the same

  • US 10,161,906 B2
  • Filed: 02/02/2015
  • Issued: 12/25/2018
  • Est. Priority Date: 03/04/2014
  • Status: Active Grant
First Claim
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1. A dielectric barrier discharge ionization detector, comprising:

  • a discharge electrode;

    a voltage supplier for applying AC voltage to the discharge electrode so as to generate plasma by causing a dielectric barrier discharge in a gas passage through which a predetermined gas is passed;

    a sample gas injector placed on a gas downstream side from a generation area of the plasma within the gas passage, for ejecting a sample gas in a direction opposite to a flowing direction of the gas; and

    an ion detector placed on the gas downstream side from the generation area of the plasma within the gas passage, including a collector electrode for collecting ions generated from a sample component in the sample gas by light emitted from the plasma,wherein an ejection port for ejecting the sample gas into the gas passage in the sample gas injector is placed on the gas downstream side of the predetermined gas from the collector electrode;

    the ion detector includes a bias electrode placed on the gas upstream side of the predetermined gas from the collector electrode in order to form a DC electric field for promoting a movement of ions in the gas passage, andthe ejection port of the sample-gas injector is placed on a gas downstream side from an end of the collector electrode on a side where the bias electrode is located.

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