GB1327231A - Fire detecting apparatus - Google Patents

Fire detecting apparatus

Info

Publication number
GB1327231A
GB1327231A GB1327231DA GB1327231A GB 1327231 A GB1327231 A GB 1327231A GB 1327231D A GB1327231D A GB 1327231DA GB 1327231 A GB1327231 A GB 1327231A
Authority
GB
United Kingdom
Prior art keywords
jan
photo
detecting apparatus
incidence
fire detecting
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
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.)
National Research Development Corp UK
Original Assignee
National Research Development Corp UK
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 National Research Development Corp UK filed Critical National Research Development Corp UK
Publication of GB1327231A publication Critical patent/GB1327231A/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
    • G08B17/12—Actuation by presence of radiation or particles, e.g. of infrared radiation or of ions

Landscapes

  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Optical Measuring Cells (AREA)

Abstract

1327231 Lenses NATIONAL RESEARCH DEVELOPMENT CORP 1 Jan 1971 [7 Jan 1970 14 July 1970 (3)] 857/70 34216/70 34217/70 and 34218/70 Heading G2J [Also in Divisions G1 G4] A beam of light, the position of incidence of which on a convex lens 94 may be varied by variations in atmospheric refraction due to the heating effects of a fire, is directed to one or the other of two foci falling on photo-cells 91, 92 by an arrangement comprising a plurality of prisms 96, the beam being fed alternately from one photo-cell to the other as the point of incidence moves across the lens surface.
GB1327231D 1970-01-07 1970-01-07 Fire detecting apparatus Expired GB1327231A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB85770 1970-01-07

Publications (1)

Publication Number Publication Date
GB1327231A true GB1327231A (en) 1973-08-15

Family

ID=9711709

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1327231D Expired GB1327231A (en) 1970-01-07 1970-01-07 Fire detecting apparatus

Country Status (1)

Country Link
GB (1) GB1327231A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2714130A1 (en) * 1976-04-15 1977-10-27 Ericsson Telefon Ab L M OPTICAL FIRE DETECTOR
DE2823957A1 (en) * 1977-06-10 1979-01-25 Nohmi Bosai Kogyo Co Ltd Light absorption smoke detector - is insensitive to position of light beam reflectors due to multi-facet surface of remote reflector
GB2154756A (en) * 1980-10-31 1985-09-11 Humphrey Instruments Inc Refractive optical element
GB2188725A (en) * 1986-03-18 1987-10-07 Hochiki Co Detecting system and detector
GB2414549A (en) * 2004-05-27 2005-11-30 Fire Beam Company Ltd A light beam alarm having a control which aligns its transmitter with its receiver
EP1983495A1 (en) * 2007-04-20 2008-10-22 Fabrication d'Applications et de Réalisations Electroniques Smoke detector with device adjacent to a reflector for selecting a light beam

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2714130A1 (en) * 1976-04-15 1977-10-27 Ericsson Telefon Ab L M OPTICAL FIRE DETECTOR
DE2823957A1 (en) * 1977-06-10 1979-01-25 Nohmi Bosai Kogyo Co Ltd Light absorption smoke detector - is insensitive to position of light beam reflectors due to multi-facet surface of remote reflector
GB2154756A (en) * 1980-10-31 1985-09-11 Humphrey Instruments Inc Refractive optical element
GB2188725A (en) * 1986-03-18 1987-10-07 Hochiki Co Detecting system and detector
GB2188725B (en) * 1986-03-18 1990-02-28 Hochiki Co Detecting system and detector
AT399786B (en) * 1986-03-18 1995-07-25 Hochiki Co MONITORING SYSTEM
GB2414549A (en) * 2004-05-27 2005-11-30 Fire Beam Company Ltd A light beam alarm having a control which aligns its transmitter with its receiver
GB2414549B (en) * 2004-05-27 2006-10-11 Fire Beam Company Ltd A light beam alarm
EP1983495A1 (en) * 2007-04-20 2008-10-22 Fabrication d'Applications et de Réalisations Electroniques Smoke detector with device adjacent to a reflector for selecting a light beam
FR2915284A1 (en) * 2007-04-20 2008-10-24 Fabrication D Applic Et De Rea SMOKE DETECTOR

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Legal Events

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