GB1264809A - - Google Patents

Info

Publication number
GB1264809A
GB1264809A GB1264809DA GB1264809A GB 1264809 A GB1264809 A GB 1264809A GB 1264809D A GB1264809D A GB 1264809DA GB 1264809 A GB1264809 A GB 1264809A
Authority
GB
United Kingdom
Prior art keywords
detector
intruder
produce
polarized
regions
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
Other languages
English (en)
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 filed Critical
Publication of GB1264809A publication Critical patent/GB1264809A/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)
  • Geophysics And Detection Of Objects (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
GB1264809D 1968-05-29 1968-05-29 Expired GB1264809A (en17)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2575968 1968-05-29

Publications (1)

Publication Number Publication Date
GB1264809A true GB1264809A (en17) 1972-02-23

Family

ID=10232848

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1264809D Expired GB1264809A (en17) 1968-05-29 1968-05-29

Country Status (2)

Country Link
DE (1) DE1927131A1 (en17)
GB (1) GB1264809A (en17)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3972598A (en) 1974-09-09 1976-08-03 Leco Corporation Multifaceted mirror structure for infrared radiation detector
DE2653110A1 (de) * 1976-06-16 1977-12-22 Cerberus Ag Infrarotstrahlungs-einbruchdetektor
US5180910A (en) * 1990-09-20 1993-01-19 Leuze Electronic Gmbh & Co. Light barrier with retroreflector and optical means

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2103909C3 (de) * 1970-02-06 1983-04-07 Hörmann GmbH, 8000 München Überwachungseinrichtung zur Feststellung eines Eindringlings,
JPS5845645B2 (ja) * 1978-03-27 1983-10-12 株式会社東芝 炉心構成要素
DE2851444C2 (de) * 1978-11-28 1983-05-26 Erwin Sick Gmbh Optik-Elektronik, 7808 Waldkirch Lichtgitter
DE2904654A1 (de) * 1979-02-07 1980-08-14 Heimann Gmbh Optische anordnung fuer einen passiven infrarot-bewegungsmelder
DE3612653A1 (de) * 1985-12-21 1987-07-02 Megamos F & G Sicherheit Verfahren und anordnung zum ueberwachen eines raumes

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3972598A (en) 1974-09-09 1976-08-03 Leco Corporation Multifaceted mirror structure for infrared radiation detector
DE2653110A1 (de) * 1976-06-16 1977-12-22 Cerberus Ag Infrarotstrahlungs-einbruchdetektor
US5180910A (en) * 1990-09-20 1993-01-19 Leuze Electronic Gmbh & Co. Light barrier with retroreflector and optical means

Also Published As

Publication number Publication date
DE1927131A1 (de) 1969-12-04

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees