GB715519A - Method and apparatus for detection of smoke - Google Patents

Method and apparatus for detection of smoke

Info

Publication number
GB715519A
GB715519A GB20345/52A GB2034552A GB715519A GB 715519 A GB715519 A GB 715519A GB 20345/52 A GB20345/52 A GB 20345/52A GB 2034552 A GB2034552 A GB 2034552A GB 715519 A GB715519 A GB 715519A
Authority
GB
United Kingdom
Prior art keywords
smoke
photo
cell
electric
reach
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
GB20345/52A
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 GB20345/52A priority Critical patent/GB715519A/en
Publication of GB715519A publication Critical patent/GB715519A/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 SYSTEMS, e.g. PERSONAL 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 SYSTEMS, e.g. PERSONAL 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

715,519. Photo-electric smoke detectors. KIDDE CO., Ltd., W. July 28, 1953 [Aug. 13, 1952], No. 20345/52. Class 40 (3) A photo-electric smoke detector comprises a housing 1 into which smoke from compartments under examination is drawn through an opening, 2, two sides of the compartment being of light polarizing material 3 polarized in planes at right angles to each other and having a photo-electric cell 5 situated behind one side and a light source 4 behind the other. The photo-electric cell feeds a micro-ammeter 6 serving as a current responsive switch controlling a relay. Thus in the absence of the smoke more of the light from source 4 is able to reach the photo-cell whereas with smoke present sufficient will reach the cell to actuate a relay controlling an alarm.
GB20345/52A 1952-08-13 1952-08-13 Method and apparatus for detection of smoke Expired GB715519A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB20345/52A GB715519A (en) 1952-08-13 1952-08-13 Method and apparatus for detection of smoke

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB20345/52A GB715519A (en) 1952-08-13 1952-08-13 Method and apparatus for detection of smoke

Publications (1)

Publication Number Publication Date
GB715519A true GB715519A (en) 1954-09-15

Family

ID=10144412

Family Applications (1)

Application Number Title Priority Date Filing Date
GB20345/52A Expired GB715519A (en) 1952-08-13 1952-08-13 Method and apparatus for detection of smoke

Country Status (1)

Country Link
GB (1) GB715519A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2104804A1 (en) * 1970-07-24 1972-04-21 Ericsson Telefon Ab L M
FR2369559A1 (en) * 1976-10-29 1978-05-26 Itt DEVICE FOR MEASURING THE RATE OF OIL POLLUTION
FR2404215A1 (en) * 1977-09-26 1979-04-20 Bendix Corp DEVICE FOR MONITORING THE DUST CONCENTRATION OF AN AEROSOL

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2104804A1 (en) * 1970-07-24 1972-04-21 Ericsson Telefon Ab L M
FR2369559A1 (en) * 1976-10-29 1978-05-26 Itt DEVICE FOR MEASURING THE RATE OF OIL POLLUTION
FR2404215A1 (en) * 1977-09-26 1979-04-20 Bendix Corp DEVICE FOR MONITORING THE DUST CONCENTRATION OF AN AEROSOL

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