Vacuum ionization gauging tube

Details Vacuum ionization gauging tube Vacuum ionization gauging tube

1992-08-26

1997-02-11

Arana, Louis M.

Electric lamp and discharge devices

Discharge device with positive ion emitter

313 93, H01J 2700

Patent

active

056024410

ABSTRACT:
A vacuum ionization gauging tube, particularly a Bayard-Alpert (B-A) type vacuum ionization gauging tube, has a firmly compact construction, and provides the capabilities for minimizing outgassing gases and measuring pressures accurately without affecting the ultimate pressure range. The B-A vacuum ionization gauging tube includes a filament having a total surface area of between 6 mm.sup.2 and 20 mm.sup.2, a grid formed like a coil from a 0.1 mm to 0.3 mm diameter metal wire, the coil having a diameter of 5 mm to 7 mm and a length of 15 mm to 20 mm and across which it can be energized, an ion collector electrode having substantially the same length as the filament, and a metal envelope for enclosing the above electrode elements and which is maintained at a potential lower than that of the filament. The grid coil has a winding pitch of between 1.5 mm and 2.5 mm. The filament and grid are spaced apart from each other by the distance of between 2 mm and 4 mm. The metal envelope has an inner diameter of 20 mm to 30 mm, and the filament is located not more than 8 mm away from the inner wall of the metal envelope.

REFERENCES:
patent: 3267326 (1966-08-01), Hayward et al.
patent: 3743876 (1973-07-01), Redhead
patent: 3839655 (1974-10-01), Helgeland et al.
patent: 4471661 (1984-09-01), Edwards, Jr.
Practical Vacuum Technology (pp. 238-241 and 244-245, Aug. 1986).
New Wide-Range B-A Gauge from UHV to 10.sup.-1 Torr (Journal of Vacuum and Scientific Technology, 20(4), Apr., 1982.
The Influence of the Grid and Ion Collector Diameters on the Sensitivity Factor and the Measuring Range of the Bayard-Alpert, Bulletin De L'Accademes, Polonaise Des Sciences Volumn XIX, No. 11-12, Sep., 1971.

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