Ion detection electrode arrangement
AssigneeHNU Systems, Inc.
InventorsJohn N. Driscoll, Frederick F. Spaziani
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Abstract
An electrode arrangement for the detection of species ionized by radiant energy from a radiation source, comprising: an annular cathode; a shield, opaque to the radiant energy, extending across the cathode and having an aperture smaller than and coaxial with the annulus formed by the cathode; and an elongated anode having its distal end coaxially of the cathode and the shield aperture, the cathode being shielded from and the anode being exposed to the radiant energy from the radiation source.
Claims21
An electrode arrangement for detecting ionized species in apparatus comprising a radiation source for ionizing said species and detection electrodes comprising an anode and a cathode, said arrangement comprising:
- said cathode having an annular configuration defining an annulus extending in a transverse plane across the axis of radiant energy emission from said radiation source;
- said anode having a distal end positioned centrally of said cathode annulus in the path of radiant energy emission from said radiation source;
- and
- a shield opaque to said radiant energy extending between said cathode and said radiation source, said shield having an aperture therethrough aligned with said cathode annulus and defining a wall of said shield spaced radially inwardly from said cathode annulus, said anode thereby adapted for direct exposure to said radiant energy through said aperture and said cathode shielded from said radiant energy by said shield.
Dependencies are inferred from the claim text.