GB2317486A - Intrusion sensing systems - Google Patents

Intrusion sensing systems

Info

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
Application number
GB9726884A
Other versions
GB2317486B (en
GB9726884D0 (en
Inventor
David John Dando
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from GBGB9512753.6A external-priority patent/GB9512753D0/en
Application filed by Individual filed Critical Individual
Priority to GB9726884A priority Critical patent/GB2317486B/en
Publication of GB9726884D0 publication Critical patent/GB9726884D0/en
Publication of GB2317486A publication Critical patent/GB2317486A/en
Application granted granted Critical
Publication of GB2317486B publication Critical patent/GB2317486B/en
Anticipated expiration legal-status Critical
Revoked legal-status Critical Current

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.
GB9726884A 1995-06-22 1996-06-24 Intrusion sensing systems Revoked GB2317486B (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Patent Citations (4)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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