JPS5550141A - Depreciation type smoke sensor - Google Patents

Depreciation type smoke sensor

Info

Publication number
JPS5550141A
JPS5550141A JP12332778A JP12332778A JPS5550141A JP S5550141 A JPS5550141 A JP S5550141A JP 12332778 A JP12332778 A JP 12332778A JP 12332778 A JP12332778 A JP 12332778A JP S5550141 A JPS5550141 A JP S5550141A
Authority
JP
Japan
Prior art keywords
receiver
light
hood
contaminated
contamination
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
JP12332778A
Other languages
Japanese (ja)
Inventor
Katsura Yamamoto
Yoshinori Shinohara
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.)
Nittan Co Ltd
Original Assignee
Nittan Co 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 Nittan Co Ltd filed Critical Nittan Co Ltd
Priority to JP12332778A priority Critical patent/JPS5550141A/en
Publication of JPS5550141A publication Critical patent/JPS5550141A/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)

Abstract

PURPOSE:To easily improve the reliability by making the light receiving surface of a smoke detecting light receiver more reluctant to be contaminated than the light receiving surface of a compensating light receiver. CONSTITUTION:The length l1 of the hood 9 of a smoke detecting light receiver, which is operative to receive the light from a light source 1 through reflecting mirrors 5 and 6 arranged to face a smoke sensing space D, is made larger than the length l2 of the hood 9 of a compensating light receiver 2 which is arranged in the vicinity of the light source 1. Thus, if the receivers 2 and 3 and the mirrors 5 and 6, which are arranged substantially in the same atmosphere, are left for a long time period so that they are contaminated with the ambient smoke or fine dusts, the percentage, at which the light receiving surface of the receiver 2 is contaminated, is enlarged than that of the receiver 3 due to the difference in the length of the hood 9. If the depreciation due to the difference in the contamination between the two surfaces is preset equal to that of the light flux to the receiver 3 based upon the contamination of the mirrors 5 and 6, the mutual depreciations are offset thereby to prevent the malfunctions due to the contamination of the optical system.
JP12332778A 1978-10-06 1978-10-06 Depreciation type smoke sensor Pending JPS5550141A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12332778A JPS5550141A (en) 1978-10-06 1978-10-06 Depreciation type smoke sensor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12332778A JPS5550141A (en) 1978-10-06 1978-10-06 Depreciation type smoke sensor

Publications (1)

Publication Number Publication Date
JPS5550141A true JPS5550141A (en) 1980-04-11

Family

ID=14857802

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12332778A Pending JPS5550141A (en) 1978-10-06 1978-10-06 Depreciation type smoke sensor

Country Status (1)

Country Link
JP (1) JPS5550141A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5757814A (en) * 1980-09-20 1982-04-07 Sumitomo Metal Ind Ltd Refining method for converter
US5024526A (en) * 1988-04-06 1991-06-18 Deutsche Forschungs- Und Versuchsanstalt Fur Luft- Und Raumfahrt E.V. Measuring instrument for determining the scattering and absorption coefficient of the atmosphere

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5757814A (en) * 1980-09-20 1982-04-07 Sumitomo Metal Ind Ltd Refining method for converter
US5024526A (en) * 1988-04-06 1991-06-18 Deutsche Forschungs- Und Versuchsanstalt Fur Luft- Und Raumfahrt E.V. Measuring instrument for determining the scattering and absorption coefficient of the atmosphere

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