GB1398977A - Gas detector - Google Patents

Gas detector

Info

Publication number
GB1398977A
GB1398977A GB4657371A GB4657371A GB1398977A GB 1398977 A GB1398977 A GB 1398977A GB 4657371 A GB4657371 A GB 4657371A GB 4657371 A GB4657371 A GB 4657371A GB 1398977 A GB1398977 A GB 1398977A
Authority
GB
United Kingdom
Prior art keywords
detector
filter
oct
fire
radiation
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
GB4657371A
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.)
EMI Ltd
Original Assignee
EMI Ltd
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 EMI Ltd filed Critical EMI Ltd
Priority to GB4657371A priority Critical patent/GB1398977A/en
Publication of GB1398977A publication Critical patent/GB1398977A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
    • G01N21/3504—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
    • 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
    • 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
    • G08B17/11—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using an ionisation chamber for detecting smoke or gas
    • G08B17/113—Constructional details
    • 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
    • G08B17/117—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means by using a detection device for specific gases, e.g. combustion products, produced by the fire
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G01N21/314—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry with comparison of measurements at specific and non-specific wavelengths
    • G01N2021/317—Special constructive features
    • G01N2021/3174—Filter wheel

Landscapes

  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

1398977 Gas detector EMI Ltd 4 Oct 1972 [7 Oct 1971] 46573/71 Heading G1A A non-dispersive infrared gas detector is used in a fire and/or intruder alarm system. Radiation from a tungsten filament lamp 2 is internally reflected along an internally reflectively coated tube towards a lead selenide cell 5. An interference filter 4 allows infrared only to reach the detector. Ingress of e.g. CO 2 , CO, methane via entries 21 or apertures at 22, causes absorption of radiation and an alarm, audible and/or visible, to be actuated if the amplitude change or rate of change is sufficient. CO 2 is indicative of a fire, an intruder's breath or use of heat generating apparatus. The filter 4 is chosen for the gas to be detected. A multi-channel arrangement for detecting two or more gases may be provided by a segmented structure and plurality of filters. A filter wheel and single detector may be used. The lamp output is modulated and a tuned amplifier 8 used, to reduce noise. A phase sensitive detector circuit 9 is coupled to the amplifier.
GB4657371A 1971-10-07 1971-10-07 Gas detector Expired GB1398977A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4657371A GB1398977A (en) 1971-10-07 1971-10-07 Gas detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4657371A GB1398977A (en) 1971-10-07 1971-10-07 Gas detector

Publications (1)

Publication Number Publication Date
GB1398977A true GB1398977A (en) 1975-06-25

Family

ID=10441779

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4657371A Expired GB1398977A (en) 1971-10-07 1971-10-07 Gas detector

Country Status (1)

Country Link
GB (1) GB1398977A (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4497373A (en) * 1981-08-20 1985-02-05 Graviner Limited Fire and explosion detection and suppression
FR2576423A1 (en) * 1985-01-09 1986-07-25 Int Standard Electric Corp OPTICAL DETECTOR AND OPTICAL DETECTION METHOD
WO1995013528A1 (en) * 1993-11-12 1995-05-18 Saphir Device for detecting gases by infrared absorption
EP0794423A1 (en) * 1996-03-06 1997-09-10 Endress + Hauser Conducta Gesellschaft für Mess- und Regeltechnik mbH + Co. Gas analyzer
DE4326694C2 (en) * 1993-08-10 2003-12-24 Gunther Krieg Device for the detection of urine in containers
GB2390462A (en) * 2002-07-05 2004-01-07 Paul Marriott Vehicle intruder detector using carbon dioxide sensor
US7174766B2 (en) * 2005-05-24 2007-02-13 Honeywell International Inc. Calibration device for carbon dioxide sensor
US8826724B2 (en) 2010-12-24 2014-09-09 Honeywell International Inc. Carbon dioxide sensor
WO2023037269A1 (en) * 2021-09-08 2023-03-16 Onpoint Technologies, Llc Spectrometer and method for detecting volatile organic compounds

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4497373A (en) * 1981-08-20 1985-02-05 Graviner Limited Fire and explosion detection and suppression
FR2576423A1 (en) * 1985-01-09 1986-07-25 Int Standard Electric Corp OPTICAL DETECTOR AND OPTICAL DETECTION METHOD
DE4326694C2 (en) * 1993-08-10 2003-12-24 Gunther Krieg Device for the detection of urine in containers
WO1995013528A1 (en) * 1993-11-12 1995-05-18 Saphir Device for detecting gases by infrared absorption
FR2712390A1 (en) * 1993-11-12 1995-05-19 Saphir Gas detection device by infrared absorption.
US5608219A (en) * 1993-11-12 1997-03-04 Saphir Device for detecting gas by infrared absorption
DE19608604A1 (en) * 1996-03-06 1997-09-11 Conducta Endress & Hauser Gas analyzer
DE19608604C2 (en) * 1996-03-06 1998-09-10 Conducta Endress & Hauser Gas analyzer and measuring cell for use in a gas analyzer
EP0794423A1 (en) * 1996-03-06 1997-09-10 Endress + Hauser Conducta Gesellschaft für Mess- und Regeltechnik mbH + Co. Gas analyzer
GB2390462A (en) * 2002-07-05 2004-01-07 Paul Marriott Vehicle intruder detector using carbon dioxide sensor
US7174766B2 (en) * 2005-05-24 2007-02-13 Honeywell International Inc. Calibration device for carbon dioxide sensor
US8826724B2 (en) 2010-12-24 2014-09-09 Honeywell International Inc. Carbon dioxide sensor
WO2023037269A1 (en) * 2021-09-08 2023-03-16 Onpoint Technologies, Llc Spectrometer and method for detecting volatile organic compounds

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Legal Events

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