GB919640A - Improvements in or relating to detectors of smoke and other suspensions - Google Patents

Improvements in or relating to detectors of smoke and other suspensions

Info

Publication number
GB919640A
GB919640A GB650060A GB650060A GB919640A GB 919640 A GB919640 A GB 919640A GB 650060 A GB650060 A GB 650060A GB 650060 A GB650060 A GB 650060A GB 919640 A GB919640 A GB 919640A
Authority
GB
United Kingdom
Prior art keywords
smoke
light
source
devices
causes
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
GB650060A
Inventor
Bernard Stephen Hansom
Jack Bertram Collins
Alfred George Clark
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.)
Wilkinson Sword Ltd
Graviner Manufacturing Co Ltd
Original Assignee
Wilkinson Sword Ltd
Graviner Manufacturing 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 Wilkinson Sword Ltd, Graviner Manufacturing Co Ltd filed Critical Wilkinson Sword Ltd
Priority to GB650060A priority Critical patent/GB919640A/en
Publication of GB919640A publication Critical patent/GB919640A/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

Landscapes

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

Abstract

919,640. Photo-electric smoke detection. GRAVINER MANUFACTURING CO. Ltd., and WILKINSON SWORD Ltd. May 19, 1961 [Feb. 24, 1960; April 9, 1960], Nos. 6500/60 and 12719/60. Class 40 (3). A detector for smoke and like suspensions includes a light source 12 and three photosensitive devices 14, 15 and 16. Light from source 12 passes through a slit 13a in a partition 13 in the apparatus and falls directly on device 15. The presence of smoke in the light path causes a reduction in the amount of light falling on device 15. In the absence of smoke, device 14 is not illuminated, or is illuminated to only a small extent. Smoke particles scatter light from the main beam and increase its illumination. Device 16 receives light direct from source 12 through adjustable attenuator 19, 20 and it is so arranged that under normal conditions (without smoke) the output from devices 14 and 16 exactly balances the output from device 15 with which they are connected in parallel but with opposite polarity. Smoke drifting in through louvres 11a causes an outof-balance current amplified by a transistor amplifier and used to operate a relay controlling an alarm lamp. For checking purposes a normally short-circuited lamp 17, in series with two lamps in parallel forming source 12 is provided. Removal of the short-circuit causes illumination of device 14 and operation of the relay unless one or both lamps 12 have failed. The devices 14, 15 and 16 are photo-voltaic cells and 14 may be a silicon cell and the remaining two selenium cells.
GB650060A 1960-02-24 1960-02-24 Improvements in or relating to detectors of smoke and other suspensions Expired GB919640A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB650060A GB919640A (en) 1960-02-24 1960-02-24 Improvements in or relating to detectors of smoke and other suspensions

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB650060A GB919640A (en) 1960-02-24 1960-02-24 Improvements in or relating to detectors of smoke and other suspensions

Publications (1)

Publication Number Publication Date
GB919640A true GB919640A (en) 1963-02-27

Family

ID=9815634

Family Applications (1)

Application Number Title Priority Date Filing Date
GB650060A Expired GB919640A (en) 1960-02-24 1960-02-24 Improvements in or relating to detectors of smoke and other suspensions

Country Status (1)

Country Link
GB (1) GB919640A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3980997A (en) * 1974-07-17 1976-09-14 General Signal Corporation Smoke detector
FR2420135A1 (en) * 1978-03-13 1979-10-12 American District Telegraph Co OPTICAL SMOKE DETECTOR
US4232307A (en) * 1978-12-18 1980-11-04 American District Telegraph Company Electrical test circuit for optical particle detector
US4237453A (en) * 1979-03-23 1980-12-02 Malinowski William J Smoke detection system and method

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3980997A (en) * 1974-07-17 1976-09-14 General Signal Corporation Smoke detector
FR2420135A1 (en) * 1978-03-13 1979-10-12 American District Telegraph Co OPTICAL SMOKE DETECTOR
US4242673A (en) * 1978-03-13 1980-12-30 American District Telegraph Company Optical particle detector
US4232307A (en) * 1978-12-18 1980-11-04 American District Telegraph Company Electrical test circuit for optical particle detector
US4237453A (en) * 1979-03-23 1980-12-02 Malinowski William J Smoke detection system and method

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