GB619133A - Improvements in or relating to ionization gauges suitable for leak detection in evacuated systems - Google Patents
Improvements in or relating to ionization gauges suitable for leak detection in evacuated systemsInfo
- Publication number
- GB619133A GB619133A GB622/46A GB62246A GB619133A GB 619133 A GB619133 A GB 619133A GB 622/46 A GB622/46 A GB 622/46A GB 62246 A GB62246 A GB 62246A GB 619133 A GB619133 A GB 619133A
- Authority
- GB
- United Kingdom
- Prior art keywords
- hydrogen
- window
- pressure
- evacuated
- valve
- 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
- 238000001514 detection method Methods 0.000 title 1
- 229910052739 hydrogen Inorganic materials 0.000 abstract 10
- 239000001257 hydrogen Substances 0.000 abstract 10
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 abstract 7
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 abstract 4
- 150000002431 hydrogen Chemical class 0.000 abstract 3
- 239000000463 material Substances 0.000 abstract 2
- 229910052763 palladium Inorganic materials 0.000 abstract 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 abstract 2
- 229910052721 tungsten Inorganic materials 0.000 abstract 2
- 239000010937 tungsten Substances 0.000 abstract 2
- 239000004215 Carbon black (E152) Substances 0.000 abstract 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 abstract 1
- 229910052788 barium Inorganic materials 0.000 abstract 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 abstract 1
- 238000003287 bathing Methods 0.000 abstract 1
- 239000011521 glass Substances 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 abstract 1
- 229930195733 hydrocarbon Natural products 0.000 abstract 1
- 150000002430 hydrocarbons Chemical class 0.000 abstract 1
- 239000007788 liquid Substances 0.000 abstract 1
- 229910052751 metal Inorganic materials 0.000 abstract 1
- 239000002184 metal Substances 0.000 abstract 1
- 229910052750 molybdenum Inorganic materials 0.000 abstract 1
- 239000011733 molybdenum Substances 0.000 abstract 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
-
- 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
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
619,133. Determining physical qualities of materials. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. Jan. 7, 1946, No. 622. Convention date, Jan. 31, 1945. [Class 37] [Also in Groups XIX and XL (a)] Apparatus for detecting a leak in an evacuated device comprises a thin metal window permeable only to hydrogen, means for subjecting one side of the window to the pressure in the device, the other side of the window being maintained at a pressure lower than the pressure in the device, means for bathing the exterior of the device in an atmosphere rich in hydrogen, and means for measuring the amount of hydrogen which passes from the interior of the device through the window. As shown, an ionization gauge comprising a sealed glass vessel 1 enclosing a cathode, grid, collector, and a barium berylliate getter, has an extension compartment 6 with an outlet 7 for connection to the evacuated device. Within the compartment 6 and sealed into the vessel 1 is a window 8 of palladium or other material permeable only to hydrogen and heated by a tungsten or molybdenum coil 9 connected to a battery &c. The outlet 7 is connected through a liquid air trap 12 to an exhaust system 13, provided with stop cocks 14, 15, and to the evacuated device 17 such as a radio valve. The'valve 17 may be surrounded by a hydrogen hood 18, or it may be probed for leaks by a jet of hydrogen, any hydrogen entering the valve passing through the system into the gauge which registers a corresponding rise in pressure. Traces of hydrogen may be introduced into the system to remove any oxide film formed on the window 8 by including in the system a palladium thimble 20, surrounded by a heating coil 21, to which the hydrogen can be supplied ; or hydrogen may be generated by a tungsten filament 19 exposed to the interior of the system and heated to about 900‹ C. to decompose oil vapours present in the system from the pump. Any hydrocarbon vapours in the system are prevented from reaching the window 8 by the trap 12.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US619133XA | 1945-01-31 | 1945-01-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB619133A true GB619133A (en) | 1949-03-04 |
Family
ID=22038951
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB622/46A Expired GB619133A (en) | 1945-01-31 | 1946-01-07 | Improvements in or relating to ionization gauges suitable for leak detection in evacuated systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB619133A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2880373A (en) * | 1953-12-21 | 1959-03-31 | Schlumberger Well Surv Corp | Apparatus for controlling gas pressure |
| WO2010094608A1 (en) * | 2009-02-18 | 2010-08-26 | Inficon Gmbh | Method for functionally testing a leak detector |
-
1946
- 1946-01-07 GB GB622/46A patent/GB619133A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2880373A (en) * | 1953-12-21 | 1959-03-31 | Schlumberger Well Surv Corp | Apparatus for controlling gas pressure |
| WO2010094608A1 (en) * | 2009-02-18 | 2010-08-26 | Inficon Gmbh | Method for functionally testing a leak detector |
| US8850866B2 (en) | 2009-02-18 | 2014-10-07 | Inficon Gmbh | Method for functionally testing a leak detector |
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