GB861717A - Improved radiation detector - Google Patents
Improved radiation detectorInfo
- Publication number
- GB861717A GB861717A GB18543/57A GB1854357A GB861717A GB 861717 A GB861717 A GB 861717A GB 18543/57 A GB18543/57 A GB 18543/57A GB 1854357 A GB1854357 A GB 1854357A GB 861717 A GB861717 A GB 861717A
- Authority
- GB
- United Kingdom
- Prior art keywords
- signal
- resistor
- fire
- valve
- circuit
- 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
- 230000005855 radiation Effects 0.000 title abstract 3
- 230000005865 ionizing radiation Effects 0.000 abstract 2
- 230000001934 delay Effects 0.000 abstract 1
- 238000010791 quenching Methods 0.000 abstract 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T7/00—Details of radiation-measuring instruments
- G01T7/12—Provision for actuation of an alarm
- G01T7/125—Alarm- or controlling circuits using ionisation chambers, proportional counters or Geiger-Mueller tubes, also functioning as UV detectors
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B17/00—Fire alarms; Alarms responsive to explosion
- G08B17/12—Actuation by presence of radiation or particles, e.g. of infrared radiation or of ions
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- High Energy & Nuclear Physics (AREA)
- Molecular Biology (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Fire-Detection Mechanisms (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
861,717. Pulse discriminating circuits. MINNEAPOLIS-HONEYWELL REGULATOR CO. June 12, 1957 [June 21, 1956], No. 18543/57. Class 40(6) [Also in Group XL(b)] Apparatus, such as a fire or flame detector, for detecting ionizing radiations in the presence of "noise", comprises a Geiger-Muller tube type of sensor arranged in a circuit so as to produce a pulsating signal when exposed to ionizing radiation characteristic of a given condition and connected by two signal paths, one including an integrating network that integrates or delays the signal pulses relatively to the pulses in the other signal path, to an amplifying circuit arranged to respond only when the signals are received simultaneously through the two paths. In a fire detector, a non-self-quench Geiger-Muller tube 10 is connected in a circuit, including a thyratron valve 15, so arranged that the background count of the tube 10 produces only random pulses in the load resistor 32 of the thyratron, whereas radiation due to a fire to which the tube 10 is exposed causes a pulsating signal across the resistor 32. The signal developed across the resistor 32 is applied through a resistor 35 to one control grid 36 of a "gated beam" type valve 16 and also through a delay network 37, 48 to the other control grid 38 of the valve 16. When a pulsating signal, due to a fire, appears across the resistor 32 a signal reaches both grids 36, 38 simultaneously causing the valve 16 to conduct which biases triode 17 to cut-off causing a relay 56 to drop out to operate a fire indicator. Random pulses across the resistor 32 do not operate both grids 36, 38 simultaneously, so that the apparatus discriminates against the background radiation. The apparatus is arranged to "fail safe": In a flame detector, Fig. 2 (not shown), the Geiger- Muller tube and the thyratron valve and circuit are mounted as a unit having a relatively low output impedance so that it may be located at a substantial distance from a separate main amplifying unit.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US861717XA | 1956-06-21 | 1956-06-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB861717A true GB861717A (en) | 1961-02-22 |
Family
ID=22196763
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB18543/57A Expired GB861717A (en) | 1956-06-21 | 1957-06-12 | Improved radiation detector |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB861717A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109839652A (en) * | 2019-01-25 | 2019-06-04 | 深圳市帕蓝特检测有限公司 | A kind of monitoring method of radioactive source, monitoring device and monitor terminal |
-
1957
- 1957-06-12 GB GB18543/57A patent/GB861717A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109839652A (en) * | 2019-01-25 | 2019-06-04 | 深圳市帕蓝特检测有限公司 | A kind of monitoring method of radioactive source, monitoring device and monitor terminal |
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