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GB716654A - Improvements in or relating to smoke detecting systems - Google Patents

Improvements in or relating to smoke detecting systems

Info

Publication number
GB716654A
GB716654A GB10626/52A GB1062652A GB716654A GB 716654 A GB716654 A GB 716654A GB 10626/52 A GB10626/52 A GB 10626/52A GB 1062652 A GB1062652 A GB 1062652A GB 716654 A GB716654 A GB 716654A
Authority
GB
United Kingdom
Prior art keywords
smoke
photo
cell
light
relating
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
GB10626/52A
Inventor
Cyril Clifford Hall
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.)
Walter Kidde Ltd
Original Assignee
Walter Kidde 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 Walter Kidde Ltd filed Critical Walter Kidde Ltd
Priority to GB10626/52A priority Critical patent/GB716654A/en
Publication of GB716654A publication Critical patent/GB716654A/en
Expired 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
    • 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

  • 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)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Fire-Detection Mechanisms (AREA)

Abstract

716,654. Photo-electric smoke detectors. KIDDE CO., Ltd., W. July 1, 1953 [April 28, 1952], No. 10626/52. Class 40 (3) In a photo-electric smoke detector smoke enters a casing through an inlet 2 and leaves through an outlet 4 and a beam of light produced by a source 5 and lens 6 illuminates the smoke. Photo-cells 7 mounted on a pentagonal frame receive light diffused from the smoke, these cells forming one arm of a Wheatstone bridge circuit a balancing arm being constituted by a further cell 8 arranged with its face immediately above and facing the light beam. A vertical mask 9 blocks nearly the entire width of the light beam and enables cell 8 to receive only a narrow beam of light the intensity of which is reduced due to the presence of smoke rather than increased. A vertical mask may be provided in front of the photo-cell and the cell may be vertically adjustable. Specification 625,731 is referred to.
GB10626/52A 1952-04-28 1952-04-28 Improvements in or relating to smoke detecting systems Expired GB716654A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB10626/52A GB716654A (en) 1952-04-28 1952-04-28 Improvements in or relating to smoke detecting systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB10626/52A GB716654A (en) 1952-04-28 1952-04-28 Improvements in or relating to smoke detecting systems

Publications (1)

Publication Number Publication Date
GB716654A true GB716654A (en) 1954-10-13

Family

ID=9971333

Family Applications (1)

Application Number Title Priority Date Filing Date
GB10626/52A Expired GB716654A (en) 1952-04-28 1952-04-28 Improvements in or relating to smoke detecting systems

Country Status (1)

Country Link
GB (1) GB716654A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4242673A (en) * 1978-03-13 1980-12-30 American District Telegraph Company Optical particle detector
WO1991008459A1 (en) * 1989-11-28 1991-06-13 Tsi Incorporated Non-imaging laser particle counter

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4242673A (en) * 1978-03-13 1980-12-30 American District Telegraph Company Optical particle detector
WO1991008459A1 (en) * 1989-11-28 1991-06-13 Tsi Incorporated Non-imaging laser particle counter
US5085500A (en) * 1989-11-28 1992-02-04 Tsi Incorporated Non-imaging laser particle counter

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