SE8101921L - OPTICAL FIRE DETECTOR - Google Patents

OPTICAL FIRE DETECTOR

Info

Publication number
SE8101921L
SE8101921L SE8101921A SE8101921A SE8101921L SE 8101921 L SE8101921 L SE 8101921L SE 8101921 A SE8101921 A SE 8101921A SE 8101921 A SE8101921 A SE 8101921A SE 8101921 L SE8101921 L SE 8101921L
Authority
SE
Sweden
Prior art keywords
detector
room
fire detector
received
air
Prior art date
Application number
SE8101921A
Other languages
Unknown language ( )
Swedish (sv)
Other versions
SE432029B (en
Inventor
E Lindgren
Original Assignee
Ericsson Telefon Ab L M
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 Ericsson Telefon Ab L M filed Critical Ericsson Telefon Ab L M
Priority to SE8101921A priority Critical patent/SE432029B/en
Priority to CH692882A priority patent/CH657929A5/en
Priority to DE19823239723 priority patent/DE3239723A1/en
Priority to PCT/SE1982/000089 priority patent/WO1982003487A1/en
Priority to GB08230821A priority patent/GB2111278B/en
Publication of SE8101921L publication Critical patent/SE8101921L/en
Priority to NO823640A priority patent/NO155469C/en
Publication of SE432029B publication Critical patent/SE432029B/en

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.
SE8101921A 1981-03-25 1981-03-25 OPTICAL FIRE DETECTOR SE432029B (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
SE8101921A SE432029B (en) 1981-03-25 1981-03-25 OPTICAL FIRE DETECTOR
CH692882A CH657929A5 (en) 1981-03-25 1982-03-25 OPTICAL FIRE DETECTOR.
DE19823239723 DE3239723A1 (en) 1981-03-25 1982-03-25 OPTICAL FIRE DETECTOR
PCT/SE1982/000089 WO1982003487A1 (en) 1981-03-25 1982-03-25 Optical fire detector
GB08230821A GB2111278B (en) 1981-03-25 1982-03-25 Optical fire detector
NO823640A NO155469C (en) 1981-03-25 1982-11-02 OPTICAL FIRE DETECTOR.

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
SE8101921L true SE8101921L (en) 1982-09-26
SE432029B SE432029B (en) 1984-03-12

Family

ID=20343435

Family Applications (1)

Application Number Title Priority Date Filing Date
SE8101921A SE432029B (en) 1981-03-25 1981-03-25 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
GB2111278A (en) 1983-06-29
CH657929A5 (en) 1986-09-30
WO1982003487A1 (en) 1982-10-14

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