GB1116877A - Improvements relating to radiation detectors - Google Patents
Improvements relating to radiation detectorsInfo
- Publication number
- GB1116877A GB1116877A GB3259065A GB3259065A GB1116877A GB 1116877 A GB1116877 A GB 1116877A GB 3259065 A GB3259065 A GB 3259065A GB 3259065 A GB3259065 A GB 3259065A GB 1116877 A GB1116877 A GB 1116877A
- Authority
- GB
- United Kingdom
- Prior art keywords
- detectors
- outputs
- screened
- fire
- coincidence
- 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
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract 1
- 239000003990 capacitor Substances 0.000 abstract 1
- JJWKPURADFRFRB-UHFFFAOYSA-N carbonyl sulfide Chemical compound O=C=S JJWKPURADFRFRB-UHFFFAOYSA-N 0.000 abstract 1
- 238000004880 explosion Methods 0.000 abstract 1
- 229910052710 silicon Inorganic materials 0.000 abstract 1
- 239000010703 silicon Substances 0.000 abstract 1
Classifications
-
- 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
Abstract
1,116,877. Fire alarms. GRAVINER (COLNBROOK) Ltd. 14 Oct., 1966 [30 July, 1965], No. 32590/65. Heading G4N. [Also in Divisions G1 and H3] A flame, fire or explosion detector comprises a plurality of radiation sensitive detectors, which may be ultra-violet sensitive gas-discharge photo-cells, directed at an area and having their active surfaces screened one from another, their outputs being applied to gating means whereby an alarm or control is effected only if all detectors produce electrical signals within the same predetermined time interval which is a fraction of a second. Separate screened passages to the detectors are aimed at making the system unresponsive to cosmic radiation. Two detectors shown are energized from a common supply and are connected through respective capacitors to respective monostable transistor circuits which have their outputs applied to a transistor coincidence gate over Zener diodes. Coincidence signals trigger a silicon-controlled rectifier through inverter and buffer stages and may step a counter. The system may comprise more than two photocells.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3259065A GB1116877A (en) | 1965-07-30 | 1965-07-30 | Improvements relating to radiation detectors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3259065A GB1116877A (en) | 1965-07-30 | 1965-07-30 | Improvements relating to radiation detectors |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1116877A true GB1116877A (en) | 1968-06-12 |
Family
ID=10340999
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3259065A Expired GB1116877A (en) | 1965-07-30 | 1965-07-30 | Improvements relating to radiation detectors |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1116877A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2174224A (en) * | 1985-04-15 | 1986-10-29 | Philips Electronic Associated | Infra-red intruder detection system |
| GB2181201A (en) * | 1985-09-30 | 1987-04-15 | Hepworth Iron Co Ltd | Coupling pipes |
-
1965
- 1965-07-30 GB GB3259065A patent/GB1116877A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2174224A (en) * | 1985-04-15 | 1986-10-29 | Philips Electronic Associated | Infra-red intruder detection system |
| GB2181201A (en) * | 1985-09-30 | 1987-04-15 | Hepworth Iron Co Ltd | Coupling pipes |
| GB2181201B (en) * | 1985-09-30 | 1989-12-20 | Hepworth Iron Co Ltd | Coupling pipes |
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