FR2456529A1 - SMOKE DETECTOR - Google Patents

SMOKE DETECTOR

Info

Publication number
FR2456529A1
FR2456529A1 FR8010612A FR8010612A FR2456529A1 FR 2456529 A1 FR2456529 A1 FR 2456529A1 FR 8010612 A FR8010612 A FR 8010612A FR 8010612 A FR8010612 A FR 8010612A FR 2456529 A1 FR2456529 A1 FR 2456529A1
Authority
FR
France
Prior art keywords
smoke
radiation
detector
scattered
radiation source
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.)
Withdrawn
Application number
FR8010612A
Other languages
French (fr)
Inventor
John A Forss
Tzuo-Chang Lee
Richard G Schulze
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.)
Honeywell Inc
Original Assignee
Honeywell Inc
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
Priority claimed from US06/039,467 external-priority patent/US4230950A/en
Priority claimed from US06/045,025 external-priority patent/US4221485A/en
Application filed by Honeywell Inc filed Critical Honeywell Inc
Publication of FR2456529A1 publication Critical patent/FR2456529A1/en
Withdrawn legal-status Critical Current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
    • G01N21/47—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
    • 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
    • G08B17/107—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 for detecting light-scattering due to smoke
    • 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

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

Abstract

The scattered light brought about by small smoke particles is utilised to improve the response-sensitivity of an optical smoke detector to the said smoke particles. A reflector (16) is arranged opposite the radiation source (14) in such a way that when there is no smoke in the measurement chamber (13) the entire radiation output by the radiation source is reflected by the reflector to the radiation source and does not impinge on the detector (17). If smoke is present, a portion of the radiation is scattered by the said smoke. Only this scattered radiation strikes the detector (17).
FR8010612A 1979-05-16 1980-05-12 SMOKE DETECTOR Withdrawn FR2456529A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US06/039,467 US4230950A (en) 1979-05-16 1979-05-16 Electro-optic smoke detector
US06/045,025 US4221485A (en) 1979-06-04 1979-06-04 Optical smoke detector

Publications (1)

Publication Number Publication Date
FR2456529A1 true FR2456529A1 (en) 1980-12-12

Family

ID=26716158

Family Applications (1)

Application Number Title Priority Date Filing Date
FR8010612A Withdrawn FR2456529A1 (en) 1979-05-16 1980-05-12 SMOKE DETECTOR

Country Status (5)

Country Link
CH (1) CH651410A5 (en)
DE (1) DE3018021A1 (en)
FR (1) FR2456529A1 (en)
IT (1) IT1143096B (en)
SE (1) SE8003547L (en)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH417405A (en) * 1964-07-14 1966-07-15 Cerberus Ag Werk Fuer Elektron Device for the detection of aerosols in air
CH427356A (en) * 1963-07-24 1966-12-31 Union Carbide Corp Instrument for detecting the presence of relatively non-volatile substances in a volatile liquid stream
US3524707A (en) * 1967-08-14 1970-08-18 Julian E Hansen Sr Pulsating light source smoke detector
US3665201A (en) * 1968-12-23 1972-05-23 Gam Rad Turbidimeter utilizing back scatter
US3713743A (en) * 1970-11-25 1973-01-30 Agricultural Control Syst Forward scatter optical turbidimeter apparatus
DE2709866A1 (en) * 1976-03-18 1977-09-29 Cerberus Ag Detector for suspended particles - has radiation receivers for direct and scattered radiation and evaluation circuit
US4103997A (en) * 1975-07-15 1978-08-01 Matsushita Electric Works, Ltd. Light scattering type smoke detector

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE682869C (en) * 1929-02-24 1939-10-23 Zeiss Carl Fa Device for measuring the degree of turbidity of liquids
DE881877C (en) * 1949-08-22 1953-07-02 Hans H Dr Loeschcke Method for counting particles floating in a translucent medium and measuring device for carrying out the method
JPS5431833B2 (en) * 1972-12-28 1979-10-09
US4121110A (en) * 1976-11-04 1978-10-17 Solomon Elias E Optically biased smoke detector

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH427356A (en) * 1963-07-24 1966-12-31 Union Carbide Corp Instrument for detecting the presence of relatively non-volatile substances in a volatile liquid stream
CH417405A (en) * 1964-07-14 1966-07-15 Cerberus Ag Werk Fuer Elektron Device for the detection of aerosols in air
US3524707A (en) * 1967-08-14 1970-08-18 Julian E Hansen Sr Pulsating light source smoke detector
US3665201A (en) * 1968-12-23 1972-05-23 Gam Rad Turbidimeter utilizing back scatter
US3713743A (en) * 1970-11-25 1973-01-30 Agricultural Control Syst Forward scatter optical turbidimeter apparatus
US4103997A (en) * 1975-07-15 1978-08-01 Matsushita Electric Works, Ltd. Light scattering type smoke detector
DE2709866A1 (en) * 1976-03-18 1977-09-29 Cerberus Ag Detector for suspended particles - has radiation receivers for direct and scattered radiation and evaluation circuit

Also Published As

Publication number Publication date
SE8003547L (en) 1980-11-17
IT1143096B (en) 1986-10-22
DE3018021A1 (en) 1980-11-27
CH651410A5 (en) 1985-09-13
IT8048651A0 (en) 1980-05-12
DE3018021C2 (en) 1989-04-20

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Legal Events

Date Code Title Description
RE Withdrawal of published application