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
Other languages
English (en)
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)
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 (ja) 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 (ja)
JP (1) JPS5545506Y2 (ja)
CH (1) CH563630A5 (ja)
DE (1) DE2361403C3 (ja)
FR (1) FR2211128A5 (ja)
GB (1) GB1417790A (ja)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH568627A5 (ja) * 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

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

Also Published As

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