FR2377033A1 - Optical smoke detector system - uses light beam with screen and lens system operating in air sampling chamber to measure optical density - Google Patents

Optical smoke detector system - uses light beam with screen and lens system operating in air sampling chamber to measure optical density

Info

Publication number
FR2377033A1
FR2377033A1 FR7800157A FR7800157A FR2377033A1 FR 2377033 A1 FR2377033 A1 FR 2377033A1 FR 7800157 A FR7800157 A FR 7800157A FR 7800157 A FR7800157 A FR 7800157A FR 2377033 A1 FR2377033 A1 FR 2377033A1
Authority
FR
France
Prior art keywords
screen
light beam
smoke detector
sampling chamber
light
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.)
Pending
Application number
FR7800157A
Other languages
French (fr)
Inventor
Lawrence Richard Snowman
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.)
General Electric Co
Original Assignee
General Electric Co
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 General Electric Co filed Critical General Electric Co
Publication of FR2377033A1 publication Critical patent/FR2377033A1/en
Pending 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
    • 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
    • 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
    • G08B17/11—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)

Abstract

An optical smoke detector comprises an internal sample chamber in which air carrying combustion products such as smoke is permitted to enter. A source of light generates a beam which is directed into the chamber to diffuse through the air sample. The sample chamber is provided with a screen on which the light beam permeating the gas sample is imaged. An output lens is arranged to transmit same of the light coacting with the screen and a detector of light furnishes warning signals under combustible condition.
FR7800157A 1977-01-07 1978-01-04 Optical smoke detector system - uses light beam with screen and lens system operating in air sampling chamber to measure optical density Pending FR2377033A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US75760577A 1977-01-07 1977-01-07

Publications (1)

Publication Number Publication Date
FR2377033A1 true FR2377033A1 (en) 1978-08-04

Family

ID=25048493

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7800157A Pending FR2377033A1 (en) 1977-01-07 1978-01-04 Optical smoke detector system - uses light beam with screen and lens system operating in air sampling chamber to measure optical density

Country Status (6)

Country Link
JP (1) JPS53106081A (en)
AU (1) AU3100277A (en)
BE (1) BE862626A (en)
DE (1) DE2758517A1 (en)
FR (1) FR2377033A1 (en)
NL (1) NL7800184A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6153550A (en) * 1984-08-23 1986-03-17 Nohmi Bosai Kogyo Co Ltd Photoelectric smoke sensor
DE3580817D1 (en) * 1984-08-23 1991-01-17 Nohmi Bosai Kogyo Co Ltd PHOTOELECTRIC SMOKE DETECTOR.
JP2536901B2 (en) * 1988-06-27 1996-09-25 日本テクトロン株式会社 Fluorescence measurement device
KR100470235B1 (en) 1997-05-29 2005-02-07 호치키 가부시키가이샤 Light projection device for a photoelectric smoke sensor

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3364030A (en) * 1964-04-29 1968-01-16 Du Pont Leuco dye-diacylazino light-sensitive dye former compositions

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3364030A (en) * 1964-04-29 1968-01-16 Du Pont Leuco dye-diacylazino light-sensitive dye former compositions

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
RESEARCH DEVELOPMENT MAGAZINE, vol. 26, no. 1, janvier 1975, BARRINGTON, ILL (US), D. FISCHER et al.: 'Potential for miniature spectrophotometers', pages 32 - 36 *

Also Published As

Publication number Publication date
JPS53106081A (en) 1978-09-14
DE2758517A1 (en) 1978-07-13
AU3100277A (en) 1979-06-07
NL7800184A (en) 1978-07-11
BE862626A (en) 1978-05-02

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