JPS5483491A - Smoke detector - Google Patents

Smoke detector

Info

Publication number
JPS5483491A
JPS5483491A JP15128277A JP15128277A JPS5483491A JP S5483491 A JPS5483491 A JP S5483491A JP 15128277 A JP15128277 A JP 15128277A JP 15128277 A JP15128277 A JP 15128277A JP S5483491 A JPS5483491 A JP S5483491A
Authority
JP
Japan
Prior art keywords
photo detector
output
light
detector
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
JP15128277A
Other languages
Japanese (ja)
Inventor
Masatake Ayusawa
Hiroshi Isotani
Shuichiro Kishi
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 Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP15128277A priority Critical patent/JPS5483491A/en
Publication of JPS5483491A publication Critical patent/JPS5483491A/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
    • G01N21/532—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke with measurement of scattering and transmission
    • 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)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

PURPOSE:To realize stable operation for a long period of time, in a photoelectric scattering type amoke detector, by compensating the output of scattered light photo detector with the output of direct light photo detector, and compensating the changes in the quantity of light due to deterioration of light emitting body and photo detector or contamination of the surface. CONSTITUTION:By using a shield plate 4, a light emitting body 1(=12), a direct light photo detector 2 (=13), and a scattered light photo detector 3 (=14) are properly installed in an external light shielding structure 5 to compose a photo-electric scattering type smoke detector. The output of the photo detector 13 which receives the direct light from the light emitting body 12, and the output of the photo detector 14 whcih receives the scattered light due to smoke when smoke is present in the structure 5 are inputted into an analog divider 17 by way of amplifiers 15, 16, respectively. The output of the scattered light photo detector is divided by the output of the direct light photo detector, and the quotient thereof is compared with the set reference voltage inputted from a reference voltage generator 19 in a comparator 18. If exceeding the set valve, an ON signal is issued; if not, an OFF signal is issued.
JP15128277A 1977-12-15 1977-12-15 Smoke detector Pending JPS5483491A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15128277A JPS5483491A (en) 1977-12-15 1977-12-15 Smoke detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15128277A JPS5483491A (en) 1977-12-15 1977-12-15 Smoke detector

Publications (1)

Publication Number Publication Date
JPS5483491A true JPS5483491A (en) 1979-07-03

Family

ID=15515264

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15128277A Pending JPS5483491A (en) 1977-12-15 1977-12-15 Smoke detector

Country Status (1)

Country Link
JP (1) JPS5483491A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2626076A1 (en) * 1988-01-19 1989-07-21 France Etat Device intended for detecting variations in transparency of an atmosphere to be monitored
US8866083B2 (en) 2010-04-21 2014-10-21 Sprue Safety Products, Ltd. Alarm
EP3367358A3 (en) * 2007-11-15 2018-12-19 Garrett Thermal Systems Limited Particle detection

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2626076A1 (en) * 1988-01-19 1989-07-21 France Etat Device intended for detecting variations in transparency of an atmosphere to be monitored
EP3367358A3 (en) * 2007-11-15 2018-12-19 Garrett Thermal Systems Limited Particle detection
CN109255924A (en) * 2007-11-15 2019-01-22 爱克斯崔里斯科技有限公司 particle detection
US8866083B2 (en) 2010-04-21 2014-10-21 Sprue Safety Products, Ltd. Alarm

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