GB1424351A - Intrusion detector system - Google Patents
Intrusion detector systemInfo
- Publication number
- GB1424351A GB1424351A GB379772A GB379772A GB1424351A GB 1424351 A GB1424351 A GB 1424351A GB 379772 A GB379772 A GB 379772A GB 379772 A GB379772 A GB 379772A GB 1424351 A GB1424351 A GB 1424351A
- Authority
- GB
- United Kingdom
- Prior art keywords
- intrusion
- section
- gate
- received
- code
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/22—Electrical actuation
- G08B13/24—Electrical actuation by interference with electromagnetic field distribution
- G08B13/2491—Intrusion detection systems, i.e. where the body of an intruder causes the interference with the electromagnetic field
- G08B13/2497—Intrusion detection systems, i.e. where the body of an intruder causes the interference with the electromagnetic field using transmission lines, e.g. cable
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Burglar Alarm Systems (AREA)
Abstract
1424351 Intruder alarms EMI Ltd 17 Jan 1973 [27 Jan 1972] 3797/72 Addition to 1289513 Headings G4N and G4H An intruder alarm comprises a plurality of fence sections S 1 , S 2 ... S n connected in series around a protected area, each section acting as a waveguide for electromagnetic energy injected by a transmitter T x and received by a receiver R x , repeaters R 12 , R 23 ..., between each pair of sections including an arrangement for sensing an intrusion in the leading section and for impressing upon the energy transmitted into the trailing section a code indicative of the leading section in the event of intrusion and a further arrangement including a detector DU and a console CC of lamps selectively lit in response to the code to indicate in which section an intrusion occurs. In each repeater shown in Fig. 2 the signal received by R x is applied via a pulse shaper PS for setting a bi-stable BS which in turn triggers a monostable MS for producing a pulse of predetermined duration which enables an AND gate A and keeps BS latched on via an inverter I and an OR gate X. When an echo pulse resulting from intrusion is received, it is sensed by gate A for modulating the regenerated signal transmitted by T x . A code detector DPC detects and enhances codes already present in the incoming signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB379772A GB1424351A (en) | 1972-01-27 | 1972-01-27 | Intrusion detector system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB379772A GB1424351A (en) | 1972-01-27 | 1972-01-27 | Intrusion detector system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1424351A true GB1424351A (en) | 1976-02-11 |
Family
ID=9765085
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB379772A Expired GB1424351A (en) | 1972-01-27 | 1972-01-27 | Intrusion detector system |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1424351A (en) |
Cited By (115)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0109552A1 (en) * | 1982-10-22 | 1984-05-30 | Siemens Aktiengesellschaft | Micro-wave intrusion detector system |
| US4562428A (en) * | 1982-05-14 | 1985-12-31 | Senstar Security Systems Corp. | Intrusion detector |
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-
1972
- 1972-01-27 GB GB379772A patent/GB1424351A/en not_active Expired
Cited By (128)
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