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GB1417790A - Photoelectric smoke detector - Google Patents

Photoelectric smoke detector

Info

Publication number
GB1417790A
GB1417790A GB5298273A GB5298273A GB1417790A GB 1417790 A GB1417790 A GB 1417790A GB 5298273 A GB5298273 A GB 5298273A GB 5298273 A GB5298273 A GB 5298273A GB 1417790 A GB1417790 A GB 1417790A
Authority
GB
United Kingdom
Prior art keywords
receiver
smoke
energized
gate
smoke detector
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
GB5298273A
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.)
Hochiki Corp
Original Assignee
Hochiki Corp
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 Hochiki Corp filed Critical Hochiki Corp
Publication of GB1417790A publication Critical patent/GB1417790A/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
    • 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

  • Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Emergency Management (AREA)
  • Business, Economics & Management (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

1417790 Smoke detectors HOCHIKI KK 15 Nov 1973 [14 Dec 1972] 52982/73 Heading G1A [Also in Division G4] A smoke detector comprises a first pulse generator 1, 2 coupled via an AND gate 9 to a light emitter source 3 e.g. a LED device or a lamp, a light receiver 4 for receiving the radiated light scattered by smoke particles, a second pulse generator 8, 7 having a different oscillation period from that of generator 1, 2 coupled to the receiver 4 and the AND gate 9 so that the source 3 is energized only when both the generators are emitting pulses and the receiver 4 is being energized. The receiver 4 may be a photo-cell or a phototransistor and any incident radiation indicative of smoke is converted into an electric signal for activating an alarm signal circuit 6 via an amplifier 5.
GB5298273A 1972-12-14 1973-11-15 Photoelectric smoke detector Expired GB1417790A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1972142726U JPS5545506Y2 (en) 1972-12-14 1972-12-14

Publications (1)

Publication Number Publication Date
GB1417790A true GB1417790A (en) 1975-12-17

Family

ID=15322143

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5298273A Expired GB1417790A (en) 1972-12-14 1973-11-15 Photoelectric smoke detector

Country Status (6)

Country Link
US (1) US3887815A (en)
JP (1) JPS5545506Y2 (en)
CH (1) CH563630A5 (en)
DE (1) DE2361403C3 (en)
FR (1) FR2211128A5 (en)
GB (1) GB1417790A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2253902C1 (en) * 2003-12-25 2005-06-10 Санкт-Петербургский государственный горный институт им. Г.В. Плеханова (Технический университет) Fire detector
RU2258260C2 (en) * 2003-06-30 2005-08-10 Закрытое акционерное общество "Телесофт-Сервис" Smoke alarm
RU2314423C1 (en) * 2006-07-04 2008-01-10 Анатолий Владимирович Ремезов Automatic system for air-gas well explosion protection
RU2333362C1 (en) * 2007-01-29 2008-09-10 Анатолий Владимирович Ремезов Automatic system for detection and suppression of explosions of methane and coal dust in working faces at early stages

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH568627A5 (en) * 1974-07-15 1975-10-31 Cerberus Ag
US4198627A (en) * 1977-07-12 1980-04-15 Cybernet Electronics Corporation Photoelectric synchronous smoke sensor
US4125779A (en) * 1977-07-13 1978-11-14 Chloride, Incorporated Smoke detector
US4193069A (en) * 1978-03-13 1980-03-11 American District Telegraph Company Latching alarm smoke detector
RU2134907C1 (en) * 1998-06-15 1999-08-20 ТОО "Производственное объединение "Спецавтоматика" Method and device for smoke recording
RU2221278C2 (en) * 2001-01-26 2004-01-10 Общество с ограниченной ответственностью "Конструкторское Бюро Пожарной Автоматики" Smoke recording gear
RU2224293C1 (en) * 2002-06-20 2004-02-20 Корчунов Александр Владимирович Fire alarm with auto-testing means
UA74697C2 (en) * 2004-03-12 2006-01-16 Private Entpr Arton Linear smoke detector
UA75528C2 (en) * 2004-09-07 2006-04-17 Private Entpr Arton Smoke fire detector
UA75532C2 (en) * 2004-09-17 2006-04-17 Private Entpr Arton Smoke fire detector
UA87559C2 (en) * 2007-09-10 2009-07-27 Частное Предприятие "Артон" THERMAL FIRE DETECTOR
RU2420808C2 (en) * 2008-02-18 2011-06-10 Частное Предприятие "Артон" Heat fire detector by misevich
US12517048B2 (en) * 2023-04-28 2026-01-06 Texas Instruments Incorporated Light scattering measurement based on skip light pulses
US12424070B2 (en) * 2023-07-12 2025-09-23 Pixart Imaging Inc. Smoke detector and optical sensing system

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3702447A (en) * 1968-07-01 1972-11-07 Xerox Corp Electronic chopper system for use in facsimile communication comprising means for alternately grounding and ungrounding inputs of amplifier
US3655289A (en) * 1971-01-22 1972-04-11 Susquehanna Corp Opacity meter with noise suppression
GB1409653A (en) * 1971-09-23 1975-10-08 Masson Scott Thrissell Eng Ltd Methods and apparatus for inspecting the surface of sheet material

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2258260C2 (en) * 2003-06-30 2005-08-10 Закрытое акционерное общество "Телесофт-Сервис" Smoke alarm
RU2253902C1 (en) * 2003-12-25 2005-06-10 Санкт-Петербургский государственный горный институт им. Г.В. Плеханова (Технический университет) Fire detector
RU2314423C1 (en) * 2006-07-04 2008-01-10 Анатолий Владимирович Ремезов Automatic system for air-gas well explosion protection
RU2333362C1 (en) * 2007-01-29 2008-09-10 Анатолий Владимирович Ремезов Automatic system for detection and suppression of explosions of methane and coal dust in working faces at early stages

Also Published As

Publication number Publication date
FR2211128A5 (en) 1974-07-12
DE2361403C3 (en) 1975-08-21
US3887815A (en) 1975-06-03
JPS5545506Y2 (en) 1980-10-24
JPS4996891U (en) 1974-08-21
CH563630A5 (en) 1975-06-30
DE2361403B2 (en) 1975-01-09
DE2361403A1 (en) 1974-06-27

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee