JPS5280880A - Attenuation type smoke detector - Google Patents

Attenuation type smoke detector

Info

Publication number
JPS5280880A
JPS5280880A JP15609775A JP15609775A JPS5280880A JP S5280880 A JPS5280880 A JP S5280880A JP 15609775 A JP15609775 A JP 15609775A JP 15609775 A JP15609775 A JP 15609775A JP S5280880 A JPS5280880 A JP S5280880A
Authority
JP
Japan
Prior art keywords
smoke detector
type smoke
attenuation type
attenuation
compartments
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.)
Pending
Application number
JP15609775A
Other languages
Japanese (ja)
Inventor
Kazunari Morisue
Shigeru Matsumoto
Kuniharu Tatezuki
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.)
Panasonic Electric Works Co Ltd
Original Assignee
Matsushita Electric Works 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 Matsushita Electric Works Ltd filed Critical Matsushita Electric Works Ltd
Priority to JP15609775A priority Critical patent/JPS5280880A/en
Publication of JPS5280880A publication Critical patent/JPS5280880A/en
Pending 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
    • G01N21/534—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke by measuring transmission alone, i.e. determining opacity

Abstract

PURPOSE:To compensate the attenuation of light owing to factors other than smoke and enable stable detection operation to be performed by dividing the inside of a housing longitudinally in two compartments, and disposing a light emitting device in the focal position of one of parabolic face mirrors and a photo detector on the other.
JP15609775A 1975-12-27 1975-12-27 Attenuation type smoke detector Pending JPS5280880A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15609775A JPS5280880A (en) 1975-12-27 1975-12-27 Attenuation type smoke detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15609775A JPS5280880A (en) 1975-12-27 1975-12-27 Attenuation type smoke detector

Publications (1)

Publication Number Publication Date
JPS5280880A true JPS5280880A (en) 1977-07-06

Family

ID=15620233

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15609775A Pending JPS5280880A (en) 1975-12-27 1975-12-27 Attenuation type smoke detector

Country Status (1)

Country Link
JP (1) JPS5280880A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1552489A2 (en) * 2002-08-23 2005-07-13 General Electric Company Rapidly responding, false detection immune alarm signal producing smoke detector
US7564365B2 (en) 2002-08-23 2009-07-21 Ge Security, Inc. Smoke detector and method of detecting smoke

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1552489A2 (en) * 2002-08-23 2005-07-13 General Electric Company Rapidly responding, false detection immune alarm signal producing smoke detector
EP1552489A4 (en) * 2002-08-23 2006-02-08 Gen Electric Rapidly responding, false detection immune alarm signal producing smoke detector
US7075445B2 (en) 2002-08-23 2006-07-11 Ge Security, Inc. Rapidly responding, false detection immune alarm signal producing smoke detector
US7564365B2 (en) 2002-08-23 2009-07-21 Ge Security, Inc. Smoke detector and method of detecting smoke

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