GB1079929A - Improvements in and relating to smoke detection devices - Google Patents

Improvements in and relating to smoke detection devices

Info

Publication number
GB1079929A
GB1079929A GB4634664A GB4634664A GB1079929A GB 1079929 A GB1079929 A GB 1079929A GB 4634664 A GB4634664 A GB 4634664A GB 4634664 A GB4634664 A GB 4634664A GB 1079929 A GB1079929 A GB 1079929A
Authority
GB
United Kingdom
Prior art keywords
light
cells
smoke
casing
nov
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
GB4634664A
Inventor
Edward John Humber
Goodwin Alfred George Ive
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.)
Radiovisor Parent Ltd
Original Assignee
Radiovisor Parent 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 Radiovisor Parent Ltd filed Critical Radiovisor Parent Ltd
Priority to GB4634664A priority Critical patent/GB1079929A/en
Publication of GB1079929A publication Critical patent/GB1079929A/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
    • 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

Landscapes

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

Abstract

1,079,929. Smoke detectors. RADIOVISER PARENT Ltd., and G.A.G. IVE. Nov. 12, 1965 [Nov. 13, 1964], No. 46346/64. Heading G1A. A smoke detector probe comprises a tubular casing with a lamp housing and a detector chamber mounted at either end, the tube containing an optical system arranged to focus a narrow pencil of light from the source to a point in the detector chamber equidistant from a number of photo-cells. Normally, no light reaches the cells (13), Fig. 2 (not shown), but when smoke is present inside the casing, having passed through holes provided in the side, light is scattered into the cells, which are activated and can actuate an alarm (audible, telephone warning to control centre, &c). The optical system comprises collimating lenses (9), a very small aperture (10) and a focusing lens (12) and the photo-cells may number four, connected in parallel and equispaced round the inside wall of the tubular chamber (14). Means for manually or regularly and automatically testing the system (a light-scattering flag member introduced into the light path) may be provided, together with a source failure warning system. A filter to stop dust, but allowing smoke to enter the casing, may be provided.
GB4634664A 1964-11-13 1964-11-13 Improvements in and relating to smoke detection devices Expired GB1079929A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4634664A GB1079929A (en) 1964-11-13 1964-11-13 Improvements in and relating to smoke detection devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4634664A GB1079929A (en) 1964-11-13 1964-11-13 Improvements in and relating to smoke detection devices

Publications (1)

Publication Number Publication Date
GB1079929A true GB1079929A (en) 1967-08-16

Family

ID=10440877

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4634664A Expired GB1079929A (en) 1964-11-13 1964-11-13 Improvements in and relating to smoke detection devices

Country Status (1)

Country Link
GB (1) GB1079929A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2431693A1 (en) * 1978-07-17 1980-02-15 Grachev Konstantin Device for measuring size of particles in fluid medium - by scattering of light beam and measuring amplitude of detected pulse, used to monitor air pollution in shops
GB2176600A (en) * 1985-06-21 1986-12-31 Francis Edward Mckenna Fire hazard detection system
US5497144A (en) * 1993-07-07 1996-03-05 Cerberus Ag Testing and adjustment of scattered-light smoke detectors
US5523744A (en) * 1993-02-15 1996-06-04 Cerberus Ag Device for testing the operation of smoke detectors
GB2343946A (en) * 1996-05-03 2000-05-24 Vision Products Pty Ltd Reduced contamination smoke detector
US6285291B1 (en) 1996-05-03 2001-09-04 Vision Products Pty. Ltd. Detection of airborne pollutants

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2431693A1 (en) * 1978-07-17 1980-02-15 Grachev Konstantin Device for measuring size of particles in fluid medium - by scattering of light beam and measuring amplitude of detected pulse, used to monitor air pollution in shops
GB2176600A (en) * 1985-06-21 1986-12-31 Francis Edward Mckenna Fire hazard detection system
US5523744A (en) * 1993-02-15 1996-06-04 Cerberus Ag Device for testing the operation of smoke detectors
US5497144A (en) * 1993-07-07 1996-03-05 Cerberus Ag Testing and adjustment of scattered-light smoke detectors
GB2343946A (en) * 1996-05-03 2000-05-24 Vision Products Pty Ltd Reduced contamination smoke detector
US6285291B1 (en) 1996-05-03 2001-09-04 Vision Products Pty. Ltd. Detection of airborne pollutants

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