GB2111278A - Optical fire detector - Google Patents

Optical fire detector

Info

Publication number
GB2111278A
GB2111278A GB08230821A GB8230821A GB2111278A GB 2111278 A GB2111278 A GB 2111278A GB 08230821 A GB08230821 A GB 08230821A GB 8230821 A GB8230821 A GB 8230821A GB 2111278 A GB2111278 A GB 2111278A
Authority
GB
United Kingdom
Prior art keywords
detector
room
fire detector
received
air
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
GB08230821A
Other versions
GB2111278B (en
Inventor
Erik Gustaf Lindgren
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.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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 Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Publication of GB2111278A publication Critical patent/GB2111278A/en
Application granted granted Critical
Publication of GB2111278B publication Critical patent/GB2111278B/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
    • G08B17/103—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device

Landscapes

  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

An optical fire detector in which a radiation source (4) generates a ray beam, which, after having passed through the air in a room, is received by a detector (5) for determining if the characteristic properties (intensity, modulation) of the received beam have been affected by combustion, generating aerosols or convection in the air. The fire detector includes a Fresnel lens (1) with two focal points, on one side of the room, the radiation source (4) being disposed at one focal point and the beam detector (5) at the other. On the other side of the room there is arranged a retroreflector (6), which by total internal reflection re-emits the beam sent from the Fresnel lens (1). An indicating circuit (11) connected to the radiation detector (5) indicates that the change in the characteristic values of the emitted and received beam exceed threshold value.
GB08230821A 1981-03-25 1982-03-25 Optical fire detector Expired GB2111278B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE8101921A SE432029B (en) 1981-03-25 1981-03-25 OPTICAL FIRE DETECTOR

Publications (2)

Publication Number Publication Date
GB2111278A true GB2111278A (en) 1983-06-29
GB2111278B GB2111278B (en) 1985-05-22

Family

ID=20343435

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08230821A Expired GB2111278B (en) 1981-03-25 1982-03-25 Optical fire detector

Country Status (4)

Country Link
CH (1) CH657929A5 (en)
GB (1) GB2111278B (en)
SE (1) SE432029B (en)
WO (1) WO1982003487A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2935549B2 (en) * 1990-08-23 1999-08-16 能美防災株式会社 Fire detection method and device
DE10228013B4 (en) * 2002-06-22 2005-11-03 Hans-Erich Sen. Gubela Partial transmission reflector, use of the partial transmission reflector and optical sensor system
EP2093731A1 (en) * 2008-02-19 2009-08-26 Siemens Aktiengesellschaft Linear optical smoke alarm with multiple part-beams
FR3027438B1 (en) * 2014-10-16 2016-11-04 Soc D'etude Et De Fabrication Ind LINEAR SMOKE DETECTOR.

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1047470B (en) * 1956-07-28 1958-12-24 Zeiss Ikon Ag Multi-focal length lens, preferably field lens
DE2303040C3 (en) * 1973-01-23 1978-03-30 Erwin Sick Gmbh Optik-Elektronik, 7808 Waldkirch Optical measuring device, in particular for measuring smoke density or visibility

Also Published As

Publication number Publication date
GB2111278B (en) 1985-05-22
SE432029B (en) 1984-03-12
CH657929A5 (en) 1986-09-30
SE8101921L (en) 1982-09-26
WO1982003487A1 (en) 1982-10-14

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Legal Events

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