JPS5280881A - Attenuation type smoke detector - Google Patents

Attenuation type smoke detector

Info

Publication number
JPS5280881A
JPS5280881A JP50156098A JP15609875A JPS5280881A JP S5280881 A JPS5280881 A JP S5280881A JP 50156098 A JP50156098 A JP 50156098A JP 15609875 A JP15609875 A JP 15609875A JP S5280881 A JPS5280881 A JP S5280881A
Authority
JP
Japan
Prior art keywords
smoke detector
type smoke
attenuation type
opposedly
smoke
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
JP50156098A
Other languages
Japanese (ja)
Inventor
Kazunari Morisue
Toru Kahara
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 JP50156098A priority Critical patent/JPS5280881A/en
Publication of JPS5280881A publication Critical patent/JPS5280881A/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

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

PURPOSE:To achieve the improvement in light emission efficiency and reduce the rate of occurrence of false alarm as far as possible despite the presence of foreign materials other than smoke by opposedly providing two parabolic face mirrors and disposing a light emitting device and photo detector in respective focal positions.
JP50156098A 1975-12-27 1975-12-27 Attenuation type smoke detector Pending JPS5280881A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP50156098A JPS5280881A (en) 1975-12-27 1975-12-27 Attenuation type smoke detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP50156098A JPS5280881A (en) 1975-12-27 1975-12-27 Attenuation type smoke detector

Publications (1)

Publication Number Publication Date
JPS5280881A true JPS5280881A (en) 1977-07-06

Family

ID=15620256

Family Applications (1)

Application Number Title Priority Date Filing Date
JP50156098A Pending JPS5280881A (en) 1975-12-27 1975-12-27 Attenuation type smoke detector

Country Status (1)

Country Link
JP (1) JPS5280881A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01232775A (en) * 1988-03-14 1989-09-18 Iwasaki Electric Co Ltd Transmission type photosensor
JPH0538558U (en) * 1991-08-02 1993-05-25 カルソニツク株式会社 Oil deterioration detector

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01232775A (en) * 1988-03-14 1989-09-18 Iwasaki Electric Co Ltd Transmission type photosensor
JPH0538558U (en) * 1991-08-02 1993-05-25 カルソニツク株式会社 Oil deterioration detector

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