GB2123950B - Intruder detection system - Google Patents

Intruder detection system

Info

Publication number
GB2123950B
GB2123950B GB08220516A GB8220516A GB2123950B GB 2123950 B GB2123950 B GB 2123950B GB 08220516 A GB08220516 A GB 08220516A GB 8220516 A GB8220516 A GB 8220516A GB 2123950 B GB2123950 B GB 2123950B
Authority
GB
United Kingdom
Prior art keywords
detection system
intruder detection
intruder
detection
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
Application number
GB08220516A
Other versions
GB2123950A (en
Inventor
Peter Southcott
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB08220516A priority Critical patent/GB2123950B/en
Publication of GB2123950A publication Critical patent/GB2123950A/en
Application granted granted Critical
Publication of GB2123950B publication Critical patent/GB2123950B/en
Expired 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
    • G08B13/18—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)
GB08220516A 1982-07-15 1982-07-15 Intruder detection system Expired GB2123950B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08220516A GB2123950B (en) 1982-07-15 1982-07-15 Intruder detection system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08220516A GB2123950B (en) 1982-07-15 1982-07-15 Intruder detection system

Publications (2)

Publication Number Publication Date
GB2123950A GB2123950A (en) 1984-02-08
GB2123950B true GB2123950B (en) 1985-07-31

Family

ID=10531689

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08220516A Expired GB2123950B (en) 1982-07-15 1982-07-15 Intruder detection system

Country Status (1)

Country Link
GB (1) GB2123950B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2370371B (en) * 2000-12-22 2002-11-27 Infrared Integrated Syst Ltd Use of distorting optics in imaging systems

Also Published As

Publication number Publication date
GB2123950A (en) 1984-02-08

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee