GB511434A - Improvements in or relating to apparatus for indicating the presence or intensity of charges of static electricity - Google Patents
Improvements in or relating to apparatus for indicating the presence or intensity of charges of static electricityInfo
- Publication number
- GB511434A GB511434A GB478338A GB478338A GB511434A GB 511434 A GB511434 A GB 511434A GB 478338 A GB478338 A GB 478338A GB 478338 A GB478338 A GB 478338A GB 511434 A GB511434 A GB 511434A
- Authority
- GB
- United Kingdom
- Prior art keywords
- electrode
- indicating
- valve
- ionization
- sleeve
- 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
- 230000003068 static effect Effects 0.000 title abstract 2
- 230000005611 electricity Effects 0.000 title 1
- 239000000463 material Substances 0.000 abstract 2
- 239000002184 metal Substances 0.000 abstract 2
- 230000002285 radioactive effect Effects 0.000 abstract 2
- 208000015181 infectious disease Diseases 0.000 abstract 1
- 238000012856 packing Methods 0.000 abstract 1
- 238000012216 screening Methods 0.000 abstract 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/24—Arrangements for measuring quantities of charge
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Radiation (AREA)
Abstract
511,434. Electrification & ionization detectors. CHADFIELD, C. R. A. Feb. 16, 1938, No. 4783. [Class 37 ] Apparatus for indicating ionization, static charges and similar conditions, for example the degree of radio-active infection of materials, comprises an electrometer triode valve 3 located in a screening case 1, the grid being connected to a long thin electrode 25 insulated from a surrounding metal tube 26. The outer end of the electrode 25 is covered by a retractable sleeve 29 for exposing the electrode, a scale 33 indicating the area of the surface exposed. The electrode 25 is also sheathed in metal braid 28, and the valve 3 may be housed in an internal casing 2. The microammeter 14 may comprise a relay, which may be polarised, for actuating warning devices. Current and voltage controls 20-22 for the valve supply are provided. Instead of the cap 29a, a collar with axially extended prongs can be provided for spacing purposes. Variation of the induced charge can be effected by altering the position of sleeve 29, or by rotating a cut-off vane between the electrode 25 and object under test. A press button 32 is employed for earthing the electrode 25. Fig. 4 shows an arrangement wherein the electrode 25 is located in an air stream that is passed through a tank 42 containing packing cardboard for photographic films. If the material is infected by radioactive emissions, the air is slightly ionized and and indication thereof is given on the meter 14.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB478338A GB511434A (en) | 1938-02-16 | 1938-02-16 | Improvements in or relating to apparatus for indicating the presence or intensity of charges of static electricity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB478338A GB511434A (en) | 1938-02-16 | 1938-02-16 | Improvements in or relating to apparatus for indicating the presence or intensity of charges of static electricity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB511434A true GB511434A (en) | 1939-08-18 |
Family
ID=9783722
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB478338A Expired GB511434A (en) | 1938-02-16 | 1938-02-16 | Improvements in or relating to apparatus for indicating the presence or intensity of charges of static electricity |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB511434A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1281573B (en) * | 1964-12-08 | 1968-10-31 | Kalle Ag | Measuring probe for determining the local charge distribution on the surfaces of solids |
| US3774108A (en) * | 1971-12-13 | 1973-11-20 | Frl Inc | Electrostatic potential detector |
| US4139813A (en) * | 1977-04-01 | 1979-02-13 | Xerox Corporation | Adaptor for an electrometer probe to permit contact potential measurements and method for using same |
| US4520318A (en) * | 1983-02-17 | 1985-05-28 | Marcel Hascal | Electric field strength indicator |
-
1938
- 1938-02-16 GB GB478338A patent/GB511434A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1281573B (en) * | 1964-12-08 | 1968-10-31 | Kalle Ag | Measuring probe for determining the local charge distribution on the surfaces of solids |
| US3774108A (en) * | 1971-12-13 | 1973-11-20 | Frl Inc | Electrostatic potential detector |
| US4139813A (en) * | 1977-04-01 | 1979-02-13 | Xerox Corporation | Adaptor for an electrometer probe to permit contact potential measurements and method for using same |
| US4520318A (en) * | 1983-02-17 | 1985-05-28 | Marcel Hascal | Electric field strength indicator |
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