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GB2251938B - Detector assemblies and apparatus - Google Patents

Detector assemblies and apparatus

Info

Publication number
GB2251938B
GB2251938B GB9200223A GB9200223A GB2251938B GB 2251938 B GB2251938 B GB 2251938B GB 9200223 A GB9200223 A GB 9200223A GB 9200223 A GB9200223 A GB 9200223A GB 2251938 B GB2251938 B GB 2251938B
Authority
GB
United Kingdom
Prior art keywords
detector assemblies
assemblies
detector
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 - Fee Related
Application number
GB9200223A
Other versions
GB9200223D0 (en
GB2251938A (en
Inventor
George Heftman
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.)
Smiths Group PLC
Original Assignee
Smiths Group 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 Smiths Group PLC filed Critical Smiths Group PLC
Publication of GB9200223D0 publication Critical patent/GB9200223D0/en
Publication of GB2251938A publication Critical patent/GB2251938A/en
Application granted granted Critical
Publication of GB2251938B publication Critical patent/GB2251938B/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • G08B13/189—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems
    • G08B13/19—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using infrared-radiation detection systems
    • G08B13/193—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using infrared-radiation detection systems using focusing means

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
GB9200223A 1991-01-15 1992-01-07 Detector assemblies and apparatus Expired - Fee Related GB2251938B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB919100791A GB9100791D0 (en) 1991-01-15 1991-01-15 Detector assemblies

Publications (3)

Publication Number Publication Date
GB9200223D0 GB9200223D0 (en) 1992-02-26
GB2251938A GB2251938A (en) 1992-07-22
GB2251938B true GB2251938B (en) 1994-07-13

Family

ID=10688430

Family Applications (2)

Application Number Title Priority Date Filing Date
GB919100791A Pending GB9100791D0 (en) 1991-01-15 1991-01-15 Detector assemblies
GB9200223A Expired - Fee Related GB2251938B (en) 1991-01-15 1992-01-07 Detector assemblies and apparatus

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB919100791A Pending GB9100791D0 (en) 1991-01-15 1991-01-15 Detector assemblies

Country Status (2)

Country Link
GB (2) GB9100791D0 (en)
HK (1) HK23195A (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4315183A1 (en) * 1993-05-07 1994-11-10 Merten Gmbh & Co Kg Geb motion detector
DE19625235A1 (en) * 1996-06-24 1998-01-02 Abb Patent Gmbh Motion detector for the detection of moving objects emitting heat radiation
KR0176625B1 (en) * 1996-11-05 1999-04-01 삼성전자주식회사 Infrared object detector
GB9805022D0 (en) * 1998-03-11 1998-05-06 Rds Electronics Limited Passive infrared detectors and housings therefor
DE10019999A1 (en) * 2000-04-22 2001-10-25 Abb Patent Gmbh Passive infrared movement detector for increasing the number of zones in a room under surveillance has detector/lens structures with an infrared detector having sensitive elements and convergent lenses

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4523095A (en) * 1982-11-19 1985-06-11 Eltec Instrument A.G. Radiation detector with asymmetrical pattern
EP0421119A1 (en) * 1989-10-03 1991-04-10 Asea Brown Boveri Aktiengesellschaft Passive infrared motion detector

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4523095A (en) * 1982-11-19 1985-06-11 Eltec Instrument A.G. Radiation detector with asymmetrical pattern
EP0421119A1 (en) * 1989-10-03 1991-04-10 Asea Brown Boveri Aktiengesellschaft Passive infrared motion detector

Also Published As

Publication number Publication date
HK23195A (en) 1995-03-03
GB9200223D0 (en) 1992-02-26
GB9100791D0 (en) 1991-02-27
GB2251938A (en) 1992-07-22

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Legal Events

Date Code Title Description
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20110107