GB1400658A - Light scattering type smoke detector - Google Patents

Light scattering type smoke detector

Info

Publication number
GB1400658A
GB1400658A GB2739073A GB2739073A GB1400658A GB 1400658 A GB1400658 A GB 1400658A GB 2739073 A GB2739073 A GB 2739073A GB 2739073 A GB2739073 A GB 2739073A GB 1400658 A GB1400658 A GB 1400658A
Authority
GB
United Kingdom
Prior art keywords
box
light
detector
source
smoke
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
GB2739073A
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 GB1400658A publication Critical patent/GB1400658A/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
    • 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)

Abstract

1400658 Smoke detectors NITTAN CO Ltd 8 June 1973 [21 June 1972] 27390/73 Heading G1A In a light scattering type smoke detector comprising a dark box permitting smoke to enter, a light source and a light sensor are arranged with their optical axes intersecting at an obtuse angle at a point within an aperture in a plate which prevents illumination of the sensor either directly or by reflection from the walls of the box. As shown, Fig.2, the source 2 projects a beam of light across the box 1 and a detector 3 is arranged with its axis at an angle to that of the source so that it only receives light scattered by smoke entering the box. A plate 4 having an aperture 41 is arranged across the box near the intersection of the source and detector axes to limit the area of the light beam and prevent light reflected from the top and bottom surfaces of the box from reaching the detector.
GB2739073A 1972-06-21 1973-06-08 Light scattering type smoke detector Expired GB1400658A (en)

Applications Claiming Priority (1)

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

Publications (1)

Publication Number Publication Date
GB1400658A true GB1400658A (en) 1975-07-23

Family

ID=13492157

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2739073A Expired GB1400658A (en) 1972-06-21 1973-06-08 Light scattering type smoke detector

Country Status (3)

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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2272760A (en) * 1992-11-20 1994-05-25 Thorn Security Optical detection of combustion products
CN110148277A (en) * 2019-04-20 2019-08-20 北京升哲科技有限公司 A kind of MEMS smoke sensor device based on double UV check

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2434178C2 (en) * 1974-07-16 1983-12-08 Matsushita Electric Works, Ltd., Kadoma, Osaka Smoke alarm device based on the light scattering principle
JPS557888Y2 (en) * 1974-09-28 1980-02-21

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 (en) * 1968-04-03 1969-11-06 Berkeley Scient Lab Inc Smoke detector
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 (en) * 1975-08-27 1977-03-04

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2272760A (en) * 1992-11-20 1994-05-25 Thorn Security Optical detection of combustion products
CN110148277A (en) * 2019-04-20 2019-08-20 北京升哲科技有限公司 A kind of MEMS smoke sensor device based on double UV check

Also Published As

Publication number Publication date
FR2189801A1 (en) 1974-01-25
FR2189801B1 (en) 1977-07-29
JPS4932581U (en) 1974-03-22

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Legal Events

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