JPS522774A - Smoke detecting circuit of photoelectric smoke detector - Google Patents

Smoke detecting circuit of photoelectric smoke detector

Info

Publication number
JPS522774A
JPS522774A JP7896275A JP7896275A JPS522774A JP S522774 A JPS522774 A JP S522774A JP 7896275 A JP7896275 A JP 7896275A JP 7896275 A JP7896275 A JP 7896275A JP S522774 A JPS522774 A JP S522774A
Authority
JP
Japan
Prior art keywords
smoke
detecting circuit
photoelectric
detector
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.)
Pending
Application number
JP7896275A
Other languages
Japanese (ja)
Inventor
Kensaburo Tanemura
Yoshiharu Suzuki
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 JP7896275A priority Critical patent/JPS522774A/en
Publication of JPS522774A publication Critical patent/JPS522774A/en
Pending 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
    • G01N21/532—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke with measurement of scattering and transmission

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)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

PURPOSE:To provide a fire alarm system which is activated independently of the kind of fumes and is compensated for the changes in sensitivity due to aging of parts.
JP7896275A 1975-06-24 1975-06-24 Smoke detecting circuit of photoelectric smoke detector Pending JPS522774A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7896275A JPS522774A (en) 1975-06-24 1975-06-24 Smoke detecting circuit of photoelectric smoke detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7896275A JPS522774A (en) 1975-06-24 1975-06-24 Smoke detecting circuit of photoelectric smoke detector

Publications (1)

Publication Number Publication Date
JPS522774A true JPS522774A (en) 1977-01-10

Family

ID=13676507

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7896275A Pending JPS522774A (en) 1975-06-24 1975-06-24 Smoke detecting circuit of photoelectric smoke detector

Country Status (1)

Country Link
JP (1) JPS522774A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4870592A (en) * 1971-12-23 1973-09-25

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4870592A (en) * 1971-12-23 1973-09-25

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