Electricity: measuring and testing – Using ionization effects – For monitoring pressure
Patent
1995-03-31
1996-10-22
O'Shea, Sandra L.
Electricity: measuring and testing
Using ionization effects
For monitoring pressure
313157, G01L 2134, G01L 2132
Patent
active
055680534
ABSTRACT:
A cold cathode ionization gauge includes a first and second electrode spaced apart and insulated from one another and having a common axis. A magnetic field generator surrounds the gauge and applies a non-time varying magnetic field along the common axis of the electrodes. The magnetic field generator includes at least one pair of opposed axially magnetized magnets adjacent each other. In one embodiment of the invention a non-magnetic annular spacer is placed between the opposed magnets. The magnet arrangement minimizes magnetic flux outside of the gauge while increasing the strength of the magnetic flux inside of the gauge. The magnetic arrangement also allows the gauge to be ignited in a very high vacuum, thereby extending the operating range of the gauge.
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Drubetsky Emil
Taylor, Jr. Donald R.
O'Shea Sandra L.
Patidar Jay M.
The Fredericks Company
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