GB1090777A - Apparatus for detecting the presence of suspended matter, such as smoke, in the air - Google Patents

Apparatus for detecting the presence of suspended matter, such as smoke, in the air

Info

Publication number
GB1090777A
GB1090777A GB29043/65A GB2904365A GB1090777A GB 1090777 A GB1090777 A GB 1090777A GB 29043/65 A GB29043/65 A GB 29043/65A GB 2904365 A GB2904365 A GB 2904365A GB 1090777 A GB1090777 A GB 1090777A
Authority
GB
United Kingdom
Prior art keywords
smoke
light
detector
photo
casing
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
GB29043/65A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB1090777A publication Critical patent/GB1090777A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • G08B17/11—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

1,090,777. Photo-electric smoke detectors. G.A. ROBERTS. July 8, 1965 [July 13, 1964], No.29043/65. Heading G1A. A smoke detector operates on the principle that light scattered from the smoke particles increases the illumination of a photo-cell, operating an alarm. The apparatus comprises a casing, containing the alarm circuit components, a lamp 44 (Fig. 1), located at one end of a light transmission conduit, containing a lens 64 and various aperture plates 56, 68, 70 and directing light into a light trap 92, and a photo-sensitive resistor detector 96. Various apertures for entry and exit of air are provided in the casing, the components and lamp being mounted so that normally a convection current of air flows through casing. Suitable light baffles are also provided. Normally little light is scattered towards the detector 96, mounted out of the direct light path, but when smoke is present, it is illuminated, causing a reduction in its resistance. The detector is arranged in a bridge circuit, two arms of which comprise the detector itself and a resistor 104, the other two capacitors 124, 126 of equal magnitude or a certain ratio. When the photo-resistor 96 decreases to the value of resistors 104 or a predetermined value proportional to it, the silicon controlled rectifier 122 is switched on, energizing a relay 128. This closes contact 128 and a buzzer 110 is energized. A temperature sensitive switch 112 is provided. An alternative circuit Fig. 5 (not shown) is arranged to switch off automatically when the smoke has dispersed, whereas in the case of the circuit of Fig. 1, this has to be done manually by breaking the supply current. An alternative casing construction is also described Fig.4 (not shown).
GB29043/65A 1964-07-13 1965-07-08 Apparatus for detecting the presence of suspended matter, such as smoke, in the air Expired GB1090777A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US382173A US3383670A (en) 1964-07-13 1964-07-13 Smoke and heat detection unit

Publications (1)

Publication Number Publication Date
GB1090777A true GB1090777A (en) 1967-11-15

Family

ID=23507828

Family Applications (1)

Application Number Title Priority Date Filing Date
GB29043/65A Expired GB1090777A (en) 1964-07-13 1965-07-08 Apparatus for detecting the presence of suspended matter, such as smoke, in the air

Country Status (4)

Country Link
US (1) US3383670A (en)
CH (1) CH430507A (en)
FR (1) FR1453920A (en)
GB (1) GB1090777A (en)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3469250A (en) * 1966-04-26 1969-09-23 Dynatron Inc Smoke,heat and excessive moisture multiple alarm device
US3460124A (en) * 1966-06-06 1969-08-05 Interstate Eng Corp Smoke detector
US3505529A (en) * 1968-02-08 1970-04-07 Bliss Co Radiation sensitive smoke detecting device
US3659278A (en) * 1970-04-15 1972-04-25 Jensen Ind Inc Fire and smoke alarm device
JPS4932581U (en) * 1972-06-21 1974-03-22
US3980997A (en) * 1974-07-17 1976-09-14 General Signal Corporation Smoke detector
US4099065A (en) * 1976-10-12 1978-07-04 Chloride, Incorporated Smoke detector with chamber for producing eddy currents
US4249169A (en) * 1979-05-18 1981-02-03 Malinowski William J Optical smoke detector
US4313110A (en) * 1980-02-19 1982-01-26 Thomas Subulak Smoke alarm having temporary disabling features
US4642615A (en) * 1984-07-31 1987-02-10 Nittan Company, Limited Light-scattering type smoke detector
DE4028188A1 (en) * 1990-09-05 1992-03-12 Esser Sicherheitstechnik FIRE DETECTORS WITH A SPARKLIGHT AND IONIZATION SYSTEM
EP0569712B1 (en) * 1992-04-25 1998-03-04 Nohmi Bosai Ltd. Fire detector
CN111594477B (en) * 2020-05-24 2022-06-10 湖北绿维精工智能系统有限公司 Smoke exhaust device with automatic rotating speed and angle adjusting function for building fire protection
CN113405703B (en) * 2021-06-16 2024-04-09 哲弗智能系统（上海）有限公司 Optical sensor and fire alarm device

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2033466A (en) * 1931-11-11 1936-03-10 Kidde & Co Walter Selective smoke detector
US2537028A (en) * 1945-10-02 1951-01-09 C O Two Fire Equipment Co Smoke detector and signal
GB625731A (en) * 1946-04-25 1949-07-04 Kidde Walter Co Ltd Improvements relating to smoke detecting and similar systems
US2476958A (en) * 1946-09-28 1949-07-26 C O Two Fire Equipment Co Smoke detector and signal
US2684008A (en) * 1949-11-23 1954-07-20 Gen Electric Method and apparatus for measuring the concentration of condensation nuclei
US2593616A (en) * 1949-12-16 1952-04-22 Rca Corp Electronic spectroscope
US2654242A (en) * 1950-07-07 1953-10-06 Shell Dev Measurement of water vapor in gases
US3231748A (en) * 1961-10-30 1966-01-25 Fyr Fyter Co Smoke detector
US3222662A (en) * 1961-12-27 1965-12-07 Electronics Corp America Signalling apparatus incorporating a differential relay
US3185975A (en) * 1962-06-18 1965-05-25 Honeywell Inc Photoelectric smoke detector

Also Published As

Publication number Publication date
US3383670A (en) 1968-05-14
CH430507A (en) 1967-02-15
FR1453920A (en) 1966-07-22

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