GB1436405A - Fire detectors - Google Patents

Fire detectors

Info

Publication number
GB1436405A
GB1436405A GB4237573A GB4237573A GB1436405A GB 1436405 A GB1436405 A GB 1436405A GB 4237573 A GB4237573 A GB 4237573A GB 4237573 A GB4237573 A GB 4237573A GB 1436405 A GB1436405 A GB 1436405A
Authority
GB
United Kingdom
Prior art keywords
detector
photo
filter
source
reflectors
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
GB4237573A
Other languages
English (en)
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.)
Anglo American Corp of South Africa Ltd
Original Assignee
Anglo American Corp of South Africa 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 Anglo American Corp of South Africa Ltd filed Critical Anglo American Corp of South Africa Ltd
Publication of GB1436405A publication Critical patent/GB1436405A/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
    • 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
    • G01N21/47—Scattering, i.e. diffuse reflection
    • G01N21/49—Scattering, i.e. diffuse reflection within a body or fluid
    • G01N21/53—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke
    • G01N21/534—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke by measuring transmission alone, i.e. determining opacity
    • 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

Landscapes

  • Analytical Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Biochemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
GB4237573A 1972-09-13 1973-09-10 Fire detectors Expired GB1436405A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ZA726258A ZA726258B (en) 1972-09-13 1972-09-13 Fire detector

Publications (1)

Publication Number Publication Date
GB1436405A true GB1436405A (en) 1976-05-19

Family

ID=25565379

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4237573A Expired GB1436405A (en) 1972-09-13 1973-09-10 Fire detectors

Country Status (8)

Country Link
US (1) US3921158A (fr)
JP (1) JPS4969099A (fr)
CA (1) CA1015042A (fr)
DE (1) DE2346249C3 (fr)
DK (1) DK137293B (fr)
FR (1) FR2199150B1 (fr)
GB (1) GB1436405A (fr)
ZA (1) ZA726258B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2176889A (en) * 1985-06-19 1987-01-07 Graviner Ltd Detecting the presence of gas
CN107829780A (zh) * 2017-10-27 2018-03-23 山西精英科技股份有限公司 一种基于煤矿安全监控联网系统的瓦斯误报警识别方法

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5193499U (fr) * 1975-01-24 1976-07-27
GB8309211D0 (en) * 1983-04-05 1983-05-11 Edinburgh Instr Infra red absorption gas detectors
GB9616809D0 (en) * 1996-08-10 1996-09-25 Eev Ltd Gas monitors
EP1087352A1 (fr) * 1999-09-22 2001-03-28 Siemens Building Technologies AG Détecteur optique de fumée
US6876305B2 (en) * 1999-12-08 2005-04-05 Gentex Corporation Compact particle sensor
DE10031555B4 (de) * 2000-06-28 2010-04-15 Robert Bosch Gmbh Optischer Sensor
US7564365B2 (en) * 2002-08-23 2009-07-21 Ge Security, Inc. Smoke detector and method of detecting smoke
AU2003268142A1 (en) * 2002-08-23 2004-03-11 General Electric Company Rapidly responding, false detection immune alarm signal producing smoke detector
CN103150590A (zh) * 2013-03-16 2013-06-12 赵明 矿井人员定位卡
DE102013212512A1 (de) * 2013-06-27 2015-01-15 Robert Bosch Gmbh Außenteil für ein Gerät und Gerät
CN103343701B (zh) * 2013-07-23 2018-09-21 北京圣博亚科技有限公司 一种井下环境监测预警系统及其智能传感器
DE102014019773B4 (de) 2014-12-17 2023-12-07 Elmos Semiconductor Se Vorrichtung und Verfahren zur Unterscheidung von festen Objekten, Kochdunst und Rauch mittels des Displays eines Mobiltelefons
DE102014019172B4 (de) 2014-12-17 2023-12-07 Elmos Semiconductor Se Vorrichtung und Verfahren zur Unterscheidung von festen Objekten, Kochdunst und Rauch mit einem kompensierenden optischen Messsystem
CN105089700A (zh) * 2015-08-10 2015-11-25 苏州欧可罗电子科技有限公司 一种矿井安全监测系统

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1695031A (en) * 1925-09-01 1928-12-11 Siemens Ag Determining gaseous carbonic acid
US2170435A (en) * 1937-12-14 1939-08-22 Standard Oil Dev Co Gas analysis apparatus
US3102257A (en) * 1958-07-21 1963-08-27 John M Miller Gas warning device
US3279308A (en) * 1963-12-02 1966-10-18 Dow Chemical Co Dispersive analyzer having means for segregating different wavelengths of radiation from a single source
US3435209A (en) * 1966-03-10 1969-03-25 Beckman Instruments Inc Two wavelength infrared analyzer having a pair of variable interference filters for determining the respective wavelengths
US3539770A (en) * 1967-11-14 1970-11-10 Barber Mfg Co Electric infrared heater
US3621200A (en) * 1968-10-31 1971-11-16 American Packaging Corp Heating element and packaging machine equipped therewith
US3677652A (en) * 1971-06-15 1972-07-18 Gte Sylvania Inc Fluid analyzer apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2176889A (en) * 1985-06-19 1987-01-07 Graviner Ltd Detecting the presence of gas
CN107829780A (zh) * 2017-10-27 2018-03-23 山西精英科技股份有限公司 一种基于煤矿安全监控联网系统的瓦斯误报警识别方法
CN107829780B (zh) * 2017-10-27 2019-11-05 精英数智科技股份有限公司 一种基于煤矿安全监控联网系统的瓦斯误报警识别方法

Also Published As

Publication number Publication date
CA1015042A (en) 1977-08-02
ZA726258B (en) 1973-11-28
DK137293B (da) 1978-02-13
DE2346249B2 (de) 1977-09-15
US3921158A (en) 1975-11-18
FR2199150B1 (fr) 1977-05-20
DE2346249A1 (de) 1974-03-21
DE2346249C3 (de) 1978-05-03
DK137293C (fr) 1978-07-10
AU6025073A (en) 1975-03-13
FR2199150A1 (fr) 1974-04-05
JPS4969099A (fr) 1974-07-04

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee