GB2317486A - Intrusion sensing systems - Google Patents
Intrusion sensing systemsInfo
- Publication number
- GB2317486A GB2317486A GB9726884A GB9726884A GB2317486A GB 2317486 A GB2317486 A GB 2317486A GB 9726884 A GB9726884 A GB 9726884A GB 9726884 A GB9726884 A GB 9726884A GB 2317486 A GB2317486 A GB 2317486A
- Authority
- GB
- United Kingdom
- Prior art keywords
- scaffold
- transmitter
- aerials
- receiver
- red
- 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.)
- Granted
Links
Classifications
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Burglar Alarm Systems (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
Vertical surface protection in a security installation is achieved by detecting disturbances in a microwave beam sent from a transmitter (30) to a receiver (31). The transmitter and receiver have associated beam aerials of extended horizontal aperture of not less than 0.50 metres (20 inches) to mitigate the effects of surface reflection from metal scaffold, plastic sheeting or netting, wooden boarding and brick or stone facing. The aerials are preferably slotted waveguide arrays and the advantages of using circular polarization are shown. Circularly-polarized slotted waveguide arrays are disclosed having a centre feed to minimize frequency dependent beam-spreading. The sensor may be used with an intruder detector (64) (to protect buildings in scafford) utilising triple technology exterior detection incorporating: microwave Doppler shift; at least one and preferably two passive infra-red devices linked together through timers and lens with horizontal curtains pattern; and anti-sabotage reflected active infra-red. The system can combine the aforementioned technologies into a new device and in this format mounted on scaffold overcomes the individual limitations of each of the prior art technologies when use in unison in an external scaffold environment.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9726884A GB2317486B (en) | 1995-06-22 | 1996-06-24 | Intrusion sensing systems |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GBGB9512753.6A GB9512753D0 (en) | 1995-06-22 | 1995-06-22 | Intrusion sensing system |
GB9726884A GB2317486B (en) | 1995-06-22 | 1996-06-24 | Intrusion sensing systems |
PCT/GB1996/001517 WO1997001160A1 (en) | 1995-06-22 | 1996-06-24 | Intrusion sensing systems |
Publications (3)
Publication Number | Publication Date |
---|---|
GB9726884D0 GB9726884D0 (en) | 1998-02-18 |
GB2317486A true GB2317486A (en) | 1998-03-25 |
GB2317486B GB2317486B (en) | 2000-01-12 |
Family
ID=26307269
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB9726884A Revoked GB2317486B (en) | 1995-06-22 | 1996-06-24 | Intrusion sensing systems |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB2317486B (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4079361A (en) * | 1974-01-23 | 1978-03-14 | Microwave And Electronic Systems Limited | Intrusion sensor and aerial therefor |
EP0337964A1 (en) * | 1988-04-13 | 1989-10-18 | ELKRON S.p.A. | A combined microwave and infra-red detector device, particularly for anti-intrusion systems |
EP0499177A1 (en) * | 1991-02-11 | 1992-08-19 | BITRON VIDEO S.r.l. | Anti-intrusion device |
US5276427A (en) * | 1991-07-08 | 1994-01-04 | Digital Security Controls Ltd. | Auto-adjust motion detection system |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3789384A (en) * | 1972-12-29 | 1974-01-29 | Lawrence Security Inc | Security system operated by changes in light at specified locations |
GB1548771A (en) * | 1976-11-05 | 1979-07-18 | Spirig Ernst | Intruder alarm systems |
US4590460A (en) * | 1984-10-03 | 1986-05-20 | Abbott Ralph E | Stairwell security system |
GB2174224B (en) * | 1985-04-15 | 1988-07-13 | Philips Electronic Associated | Infra-red intruder detection system |
-
1996
- 1996-06-24 GB GB9726884A patent/GB2317486B/en not_active Revoked
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4079361A (en) * | 1974-01-23 | 1978-03-14 | Microwave And Electronic Systems Limited | Intrusion sensor and aerial therefor |
EP0337964A1 (en) * | 1988-04-13 | 1989-10-18 | ELKRON S.p.A. | A combined microwave and infra-red detector device, particularly for anti-intrusion systems |
EP0499177A1 (en) * | 1991-02-11 | 1992-08-19 | BITRON VIDEO S.r.l. | Anti-intrusion device |
US5276427A (en) * | 1991-07-08 | 1994-01-04 | Digital Security Controls Ltd. | Auto-adjust motion detection system |
Non-Patent Citations (2)
Title |
---|
PROCS 1986 INT CARNAHAN CONF ON SECURITY TECH: ELEC CRIME COUNTERMEASURES,12-14 AUG 1986,pp 119-124 * |
PROCS 1993 INT CARNAHAN CONF ON SECURITY TECHNOLOGY, 13 OCTOBER 1993, pp 251-253 * |
Also Published As
Publication number | Publication date |
---|---|
GB2317486B (en) | 2000-01-12 |
GB9726884D0 (en) | 1998-02-18 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
773K | Patent revoked under sect. 73(2)/1977 |
Free format text: PATENT REVOKED ON 20040914 |