GB555134A - Improvements in or relating to apparatus for measuring low gas pressure - Google Patents
Improvements in or relating to apparatus for measuring low gas pressureInfo
- Publication number
- GB555134A GB555134A GB140642A GB140642A GB555134A GB 555134 A GB555134 A GB 555134A GB 140642 A GB140642 A GB 140642A GB 140642 A GB140642 A GB 140642A GB 555134 A GB555134 A GB 555134A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cathode
- anode
- voltage
- current
- 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
- 239000011248 coating agent Substances 0.000 abstract 1
- 238000000576 coating method Methods 0.000 abstract 1
- 230000004048 modification Effects 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
- 230000002285 radioactive effect Effects 0.000 abstract 1
- ZCUFMDLYAMJYST-UHFFFAOYSA-N thorium dioxide Chemical compound O=[Th]=O ZCUFMDLYAMJYST-UHFFFAOYSA-N 0.000 abstract 1
- 229910003452 thorium oxide Inorganic materials 0.000 abstract 1
- VGBPIHVLVSGJGR-UHFFFAOYSA-N thorium(4+);tetranitrate Chemical compound [Th+4].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O VGBPIHVLVSGJGR-UHFFFAOYSA-N 0.000 abstract 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 abstract 1
- 230000000007 visual effect Effects 0.000 abstract 1
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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
- H01J9/42—Measurement or testing during manufacture
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
555,134. Measuring pressure. KLEMPERER, O. E. H. Feb. 3, 1942, No. 1406. [Class 37] [Also in Groups XIX and XL] A pressure gauge comprises an electric discharge device adapted to be immersed in the atmosphere of which the pressure is to be measured, said device including a cathode substantially surrounded an anode and means for causing electrons to travel in long paths between cathode and anode so that sufficient ionization takes place to produce a desired indicating current. The cathode C is a cylinder having end discs through central holes in which a rod A of tungsten wire passes, the wire having been dipped in thorium nitrate and warmed up gently to provide a thin radio-active coating of thorium oxide on the anode. The electrodes are set up in a bulb T communicating by a pipe V with the space in which is the gas to be measured. A solenoid M disposed coaxially with the cathode C provides the axial magnetic field. The cathode is earthed through a microammeter ÁA, while a voltmeter KV is provided for measuring the voltage between the anode and cathode. In a preferable indicating circuit, Fig. 5, the load resistance is in the cathode lead and comprises a high resistance N and a lower resistance R, the voltage across the latter being amplified in a variable valve V1. In a modification, the valve is connected to operate as a cathode follower valve and a voltameter across the device AC is adjusted until the milliammeter gives the particular indication corresponding to a particular current through the device AC. In a final form, the instrument MA is dispensed with and a visual indicator used of the kind described in Specification 481,790 and known as the " Magic Eye " the pattern on which closes at a particular value of the current through the gauge and the vacuum is determined by the voltage across AC when the pattern just closes. The voltage is derived from a potentiometer in connection with a main supply. Specifications 474,845, 481,790, [Group XL], and 493,274 are referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB140642A GB555134A (en) | 1942-02-03 | 1942-02-03 | Improvements in or relating to apparatus for measuring low gas pressure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB140642A GB555134A (en) | 1942-02-03 | 1942-02-03 | Improvements in or relating to apparatus for measuring low gas pressure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB555134A true GB555134A (en) | 1943-08-05 |
Family
ID=9721454
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB140642A Expired GB555134A (en) | 1942-02-03 | 1942-02-03 | Improvements in or relating to apparatus for measuring low gas pressure |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB555134A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2774936A (en) * | 1952-07-29 | 1956-12-18 | Int Standard Electric Corp | Ionisation manometers |
| US2817030A (en) * | 1951-04-20 | 1957-12-17 | Int Standard Electric Corp | Ionisation manometers |
| DE1044446B (en) * | 1955-06-02 | 1958-11-20 | Heraeus Gmbh W C | Ionization manometer with cold cathode |
| US3399341A (en) * | 1965-05-24 | 1968-08-27 | United Aircraft Corp | Vacuum pressure measurement apparatus utlizing hollow cathode discharge |
| US4967157A (en) * | 1988-08-29 | 1990-10-30 | Mks Instruments, Inc. | Method and circuit for extending the range of a cold cathode discharge vacuum gauge |
| GB2256310A (en) * | 1991-05-31 | 1992-12-02 | Boc Group Plc | A vacuum gauge |
| US7098667B2 (en) | 2003-12-31 | 2006-08-29 | Fei Company | Cold cathode ion gauge |
| US7173430B2 (en) | 2002-09-19 | 2007-02-06 | Otto-Von-Guericke Universitaet Magdeburg | Cold-cathode ionization manometer having a longer service life due to two separate cathodes |
-
1942
- 1942-02-03 GB GB140642A patent/GB555134A/en not_active Expired
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2817030A (en) * | 1951-04-20 | 1957-12-17 | Int Standard Electric Corp | Ionisation manometers |
| US2774936A (en) * | 1952-07-29 | 1956-12-18 | Int Standard Electric Corp | Ionisation manometers |
| DE1044446B (en) * | 1955-06-02 | 1958-11-20 | Heraeus Gmbh W C | Ionization manometer with cold cathode |
| US3399341A (en) * | 1965-05-24 | 1968-08-27 | United Aircraft Corp | Vacuum pressure measurement apparatus utlizing hollow cathode discharge |
| US4967157A (en) * | 1988-08-29 | 1990-10-30 | Mks Instruments, Inc. | Method and circuit for extending the range of a cold cathode discharge vacuum gauge |
| GB2256310A (en) * | 1991-05-31 | 1992-12-02 | Boc Group Plc | A vacuum gauge |
| US7173430B2 (en) | 2002-09-19 | 2007-02-06 | Otto-Von-Guericke Universitaet Magdeburg | Cold-cathode ionization manometer having a longer service life due to two separate cathodes |
| US7098667B2 (en) | 2003-12-31 | 2006-08-29 | Fei Company | Cold cathode ion gauge |
| EP1700093A4 (en) * | 2003-12-31 | 2007-09-26 | Fei Co | Cold cathode ion gauge |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Sanders | The value of the Townsend coefficient for ionization by collision at large plate distances and near atmospheric pressure | |
| GB555134A (en) | Improvements in or relating to apparatus for measuring low gas pressure | |
| US1697339A (en) | Process of manufacturing electronic devices | |
| US2383600A (en) | Vacuum gauge indicator system | |
| US2874304A (en) | Ionization chamber | |
| US2238234A (en) | Pressure indicator | |
| GB840935A (en) | Improvements in and relating to apparatus for continuously measuring the concentration of substances present in a fluid | |
| GB772474A (en) | Improvements in or relating to the detection of leaks in vacuum apparatus | |
| Kuffel | The effect of irradiation on the breakdown voltage of sphere-gaps in air under direct and alternating voltages | |
| US3379967A (en) | Vacuum gauge including a cold cathode ionization tube | |
| Emeléus | Notes on the electrical counter | |
| GB780828A (en) | Improvements in or relating to electric glow discharge apparatus for measuring low gas-pressures | |
| GB566470A (en) | Improvements in and relating to electrical apparatus for the measurement of pressurein vacuum systems | |
| GB742076A (en) | Electric discharge tube and circuit arrangement for measuring gas pressure | |
| GB757147A (en) | Improvements in or relating to devices for measuring very low gas pressures | |
| US2157823A (en) | High voltage measurement means | |
| GB956141A (en) | Electrical getter-ion vacuum pump or gauge apparatus | |
| DE892833C (en) | Ionization vacuum gauge with cold cathode | |
| GB612345A (en) | Improvements in or relating to devices for determining a time integral of an electric current | |
| GB722788A (en) | Improvements in or relating to a method of measuring low pressures with an ionisation gauge comprising a cold cathode | |
| DE663389C (en) | Device for checking and / or displaying the vacuum in vacuum discharge apparatus with glow or mercury cathode | |
| GB611333A (en) | Vacuum tube voltmeter | |
| CH195697A (en) | Electrical method for measuring the dust and smoke content of gases. | |
| GB590046A (en) | Improvements in apparatus for the measurement of high vacua | |
| GB574798A (en) | Apparatus for measuring medium and high vacua |