FR2189801B1 - - Google Patents

Info

Publication number
FR2189801B1
FR2189801B1 FR7322489A FR7322489A FR2189801B1 FR 2189801 B1 FR2189801 B1 FR 2189801B1 FR 7322489 A FR7322489 A FR 7322489A FR 7322489 A FR7322489 A FR 7322489A FR 2189801 B1 FR2189801 B1 FR 2189801B1
Authority
FR
France
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
FR7322489A
Other versions
FR2189801A1 (fr
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.)
Nittan Co Ltd
Original Assignee
Nittan Co 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 Nittan Co Ltd filed Critical Nittan Co Ltd
Publication of FR2189801A1 publication Critical patent/FR2189801A1/fr
Application granted granted Critical
Publication of FR2189801B1 publication Critical patent/FR2189801B1/fr
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
    • 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

  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
FR7322489A 1972-06-21 1973-06-20 Expired FR2189801B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1972072536U JPS4932581U (fr) 1972-06-21 1972-06-21

Publications (2)

Publication Number Publication Date
FR2189801A1 FR2189801A1 (fr) 1974-01-25
FR2189801B1 true FR2189801B1 (fr) 1977-07-29

Family

ID=13492157

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7322489A Expired FR2189801B1 (fr) 1972-06-21 1973-06-20

Country Status (3)

Country Link
JP (1) JPS4932581U (fr)
FR (1) FR2189801B1 (fr)
GB (1) GB1400658A (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2434178C2 (de) * 1974-07-16 1983-12-08 Matsushita Electric Works, Ltd., Kadoma, Osaka Rauchmeldegerät nach dem Lichtstreuprinzip
JPS557888Y2 (fr) * 1974-09-28 1980-02-21
GB2272760A (en) * 1992-11-20 1994-05-25 Thorn Security Optical detection of combustion products
CN110148277B (zh) * 2019-04-20 2021-04-20 北京升哲科技有限公司 一种基于双波长检测的mems烟雾传感器

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3383670A (en) * 1964-07-13 1968-05-14 Gordon A. Roberts Smoke and heat detection unit
US3505529A (en) * 1968-02-08 1970-04-07 Bliss Co Radiation sensitive smoke detecting device
DE1915906A1 (de) * 1968-04-03 1969-11-06 Berkeley Scient Lab Inc Rauchdetektor
US3708675A (en) * 1969-09-19 1973-01-02 Furukawa Electric Co Ltd Smoke detector in which air entrance and egress are located in oppositely disposed surfaces which are shaped to cause an air velocity differential
JPS5230954U (fr) * 1975-08-27 1977-03-04

Also Published As

Publication number Publication date
JPS4932581U (fr) 1974-03-22
FR2189801A1 (fr) 1974-01-25
GB1400658A (en) 1975-07-23

Similar Documents

Publication Publication Date Title
JPS4884042A (fr)
JPS49103722U (fr)
JPS4932581U (fr)
JPS5129465B2 (fr)
JPS5213393Y2 (fr)
FR2173484A5 (fr)
JPS5226403Y2 (fr)
JPS5524268B2 (fr)
JPS551217B2 (fr)
CS149962B1 (fr)
CS162148B1 (fr)
JPS4941893U (fr)
CS161000B1 (fr)
CS161004B1 (fr)
CS160998B1 (fr)
CS160318B1 (fr)
JPS493323A (fr)
CS159432B1 (fr)
JPS4948356U (fr)
CS150080B1 (fr)
JPS4914011U (fr)
CS158500B1 (fr)
CS158498B1 (fr)
CS158340B1 (fr)
CS157597B1 (fr)

Legal Events

Date Code Title Description
ST Notification of lapse