Inventors:
Daniel G. Bills - Boulder CO
Paul C. Arnold - Boulder CO
Stephen L. Dodgen - Boulder CO
Craig B. Van Cleve - Boulder CO
Assignee:
Granville-Phillips Company - Boulder CO
International Classification:
A47B 500
Abstract:
An ionization gauge of the type including a source of electrons, an accelerating electrode for accelerating said electrons through a volume generally defined by said accelerating electrode and a collector electrode, disposed in the volume. Ions are collected by the collector electrode. The accelerating electrode comprises a substantially closed anode having an internal cavity to precisely define the volume. An aperture is disposed to admit said electrons from the source into the closed volume.