GB894146A - Improved alarm system - Google Patents
Improved alarm systemInfo
- Publication number
- GB894146A GB894146A GB3751359A GB3751359A GB894146A GB 894146 A GB894146 A GB 894146A GB 3751359 A GB3751359 A GB 3751359A GB 3751359 A GB3751359 A GB 3751359A GB 894146 A GB894146 A GB 894146A
- Authority
- GB
- United Kingdom
- Prior art keywords
- radiation
- series
- rotating
- radiation pulses
- detector
- 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 abstract 5
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/18—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
- G08B13/181—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using active radiation detection systems
- G08B13/183—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using active radiation detection systems by interruption of a radiation beam or barrier
- G08B13/184—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using active radiation detection systems by interruption of a radiation beam or barrier using radiation reflectors
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Burglar Alarm Systems (AREA)
Abstract
894,146. Intruder alarms, DE HAVILLAND AIRCRAFT CO. Ltd. Oct. 21, 1960 [Nov. 5, 1959], No. 37513/59. Class 118. A rotating narrow beam of radiation (preferably infra-red) from a source 12 (Fig. 1) or 62 (Fig. 5) is reflected from stationary reflectors 16 (Fig. 1) or 66 (Fig. 5) as a series of radiation pulses to a detector 14 (Fig. 1) or 70 (Fig. 5); output signals from the detector are compared with a series of electrical signals corresponding to the radiation pulses, and an alarm is given when the output signals are interrupted. The beam of radiation may be produced by a lamp co-operating with a rotating reflector or with a rotating shutter having an eccentric aperture. The shutter may also include magnetized areas which co-operate with a stationary pick-up to produce the series of electrical signals corresponding to the radiation pulses.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3751359A GB894146A (en) | 1959-11-05 | 1959-11-05 | Improved alarm system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3751359A GB894146A (en) | 1959-11-05 | 1959-11-05 | Improved alarm system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB894146A true GB894146A (en) | 1962-04-18 |
Family
ID=10397032
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3751359A Expired GB894146A (en) | 1959-11-05 | 1959-11-05 | Improved alarm system |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB894146A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2174194A (en) * | 1985-03-27 | 1986-10-29 | Nigel Howard Walton | Monitoring a space |
-
1959
- 1959-11-05 GB GB3751359A patent/GB894146A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2174194A (en) * | 1985-03-27 | 1986-10-29 | Nigel Howard Walton | Monitoring a space |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| GB1527965A (en) | Optical fire detector | |
| GB894146A (en) | Improved alarm system | |
| KR840000005A (en) | Dual spectrum fire detector with identification function | |
| GB1017178A (en) | Beam interruption detector | |
| AU555096B2 (en) | Smoke detector containing a radiation source operating in a pulse mode | |
| JPS5244588A (en) | Disturbance detection system | |
| GB1082973A (en) | Electrical interrupted-beam alarm systems | |
| JPS52155100A (en) | I nfrated intrusion alarm | |
| JPS5235595A (en) | Moving object detection system | |
| GB1042129A (en) | Selective emission and detection of resonance lines in atomic spectra | |
| GB1417790A (en) | Photoelectric smoke detector | |
| SU580349A1 (en) | Superhigh vacuum installation | |
| GB1138115A (en) | Controlling system using modulated light | |
| GB992270A (en) | Radiation beam chopping system | |
| JPS5353296A (en) | Artificial signal generator for radar electromagnetic wave tracing location | |
| JPS524145A (en) | Unnecessary wave receiving prevention system | |
| GB1233063A (en) | ||
| JPS5362966A (en) | Photoelectric signal amplifier | |
| GB749537A (en) | Reflected-light signals | |
| GB1527506A (en) | Infra-red radiation detector | |
| GB833897A (en) | Improvements in infra-red ray detecting apparatus | |
| JPS5219095A (en) | Detectin alarm of movale body | |
| JPS52138899A (en) | Intrusion alarm device | |
| JPS5362999A (en) | Beam type alarm unit | |
| GB868886A (en) | Radiation energy comparison system |