Photoionization detector and method of operating same
AssigneeMolex Incorporated
InventorsMiao Xu, Wenfeng Peng, Mariusz Kloza, Amram Netanel Afenzer
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Abstract
An electrode stack assembly includes an electrically insulative substrate having a cavity therethrough extending, a first counter electrode on a top surface thereof and extending through the substrate, a second sensing electrode on a bottom surface thereof and extending through the substrate, and a third electrode having a top body portion on a top of the substrate, a bottom body portion on a bottom of the substrate, and a coupling pin passing through the substrate and electrically coupling the top and bottom body portions. The third electrode electrically separates the pin of the sensing electrode from the counter electrode.
Claims20
A method of operating a photoionization detector, the method comprising:
- applying a first electric potential to a counter electrode on a top surface of an electrically insulative substrate;
- applying a second electric potential to a sensing electrode on a bottom surface of the electrically insulative substrate;
- applying a third electric potential to a third electrode having a pin mounting hole positioned for a first pin to pass therethrough the substrate and electrically separate the sensing electrode from the counter electrode;
- and
- causing ionization of gas in a cavity of the electrically insulative substrate.
A method of operating a photoionization detector in compensation mode, the method comprising:
- applying a first electric potential to a counter electrode on a top surface of an electrically insulative substrate;
- applying a second electric potential to a sensing electrode on a bottom surface of the insulative substrate;
- applying a third electric potential to a third electrode having a pin passing through the substrate and separating a current path of the counter electrode from a current path of the sensing electrode, wherein the first and third electric potentials are the same or generally the same, and the second electric potential is generally higher than the first potential;
- and
- causing ionization of gas in a cavity of the insulative substrate.
A method of operating a photoionization detector in a block mode, the method comprising:
- applying a first electric potential to a counter electrode on a top surface of an electrically insulative substrate;
- applying a second electric potential to a sensing electrode on a bottom surface of the insulative substrate;
- applying a third electric potential to a third electrode having a pin passing through the substrate and separating a current path of the counter electrode from a current path of the sensing electrode, wherein the second and third electric potentials are the same, and the second electric potential is generally higher than the first potential;
- and
- causing ionization of gas in a cavity of the insulative substrate.
Dependencies are inferred from the claim text.