GB709266A - Improvements in or relating to ionisation gauges - Google Patents
Improvements in or relating to ionisation gaugesInfo
- Publication number
- GB709266A GB709266A GB336650A GB336650A GB709266A GB 709266 A GB709266 A GB 709266A GB 336650 A GB336650 A GB 336650A GB 336650 A GB336650 A GB 336650A GB 709266 A GB709266 A GB 709266A
- Authority
- GB
- United Kingdom
- Prior art keywords
- shield
- ion collector
- volts
- negative potential
- collector
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J41/00—Discharge tubes for measuring pressure of introduced gas or for detecting presence of gas; Discharge tubes for evacuation by diffusion of ions
- H01J41/02—Discharge tubes for measuring pressure of introduced gas or for detecting presence of gas
- H01J41/04—Discharge tubes for measuring pressure of introduced gas or for detecting presence of gas with ionisation by means of thermionic cathodes
Landscapes
- Measuring Fluid Pressure (AREA)
- Electron Tubes For Measurement (AREA)
Abstract
709,266. Thermionic cathode tubes. POSTMASTER GENERAL. Oct. 17, 1951 [Feb. 9, 1950], No. 3366/50. Class 39(1) An ionization gauge is provided with a shield 6 arranged between an electron collector 4 and an ion collector 5 and maintained at a negative potential sufficient to suppress substantially the emission of electrons from the ion collector during operation of the gauge. The shield 6 is preferably in the form of a cylinder closed at one end by a member 7 provided with a slit 8 having a width of the same order as the distance between the shield 6 and the thermionic cathode 2. The anode 4 may be at a potential of 100 to 200 volts, the ion collector at a negative potential of about 2 volts, and the shield 6 at a negative potential of about 40 volts relative to the cathode. The surface of the ion collector is preferably blackened to prevent reflection of radiation on to the inner surface of the shield 6. The electrodes are enclosed in a glass envelope provided with side tube 3 for connection with the source of low pressures to be measured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB336650A GB709266A (en) | 1950-02-09 | 1950-02-09 | Improvements in or relating to ionisation gauges |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB336650A GB709266A (en) | 1950-02-09 | 1950-02-09 | Improvements in or relating to ionisation gauges |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB709266A true GB709266A (en) | 1954-05-19 |
Family
ID=9756963
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB336650A Expired GB709266A (en) | 1950-02-09 | 1950-02-09 | Improvements in or relating to ionisation gauges |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB709266A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2889478A (en) * | 1953-07-02 | 1959-06-02 | Int Standard Electric Corp | Electron discharge apparatus |
| US3292078A (en) * | 1961-12-08 | 1966-12-13 | Gca Corp | Vacuum gauge having an X-ray trap and a shield |
-
1950
- 1950-02-09 GB GB336650A patent/GB709266A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2889478A (en) * | 1953-07-02 | 1959-06-02 | Int Standard Electric Corp | Electron discharge apparatus |
| US3292078A (en) * | 1961-12-08 | 1966-12-13 | Gca Corp | Vacuum gauge having an X-ray trap and a shield |
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