JPS5471683A - Smoke sensors - Google Patents

Smoke sensors

Info

Publication number
JPS5471683A
JPS5471683A JP13858977A JP13858977A JPS5471683A JP S5471683 A JPS5471683 A JP S5471683A JP 13858977 A JP13858977 A JP 13858977A JP 13858977 A JP13858977 A JP 13858977A JP S5471683 A JPS5471683 A JP S5471683A
Authority
JP
Japan
Prior art keywords
smoke
photo detector
detector
optical axis
output
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
JP13858977A
Other languages
Japanese (ja)
Inventor
Takashi Yoshikawa
Kenzo Miura
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 JP13858977A priority Critical patent/JPS5471683A/en
Publication of JPS5471683A publication Critical patent/JPS5471683A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL 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

  • Analytical Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Biochemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Fire-Detection Mechanisms (AREA)

Abstract

PURPOSE:To avoid malfunctions and let the abnormality of the device be displayed as well by providing a first photo detector on the optical axis of light emitting part and a second photo detector out of the optical axis, detecting the signals of both differentially to detect smoke and lighting a display lamp with the input to the first photo detector. CONSTITUTION:A first photo detector 2 is provided on the axis of a light emitting part 1 and a second light emitting element 3 is provided with a deviation by an angle theta from the optical axis and these are so disposed that only the element 2 receives light when there is no smoke and the element 3 receives the scattering light owing to smoke when the smoke has evolved. The output of the element 3 and the output of the element 2 having been amplified 8 are removed of the effect of interior lighting through filter parts 9, 9' respectively, after which these are applied to a differential amplifier 10 to obtain the input difference of both, which triggers an alarm device 5 when there is the input of more than specified scattering light. When an obstruction such as insect other than smoke has existed in the detector, the output from the element 2 is so small that the display lamp 4 does not go on, indicating the abnormal state of the detector. Here, the alarm device 5 does not actuate either.
JP13858977A 1977-11-17 1977-11-17 Smoke sensors Pending JPS5471683A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13858977A JPS5471683A (en) 1977-11-17 1977-11-17 Smoke sensors

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13858977A JPS5471683A (en) 1977-11-17 1977-11-17 Smoke sensors

Publications (1)

Publication Number Publication Date
JPS5471683A true JPS5471683A (en) 1979-06-08

Family

ID=15225629

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13858977A Pending JPS5471683A (en) 1977-11-17 1977-11-17 Smoke sensors

Country Status (1)

Country Link
JP (1) JPS5471683A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2516282A1 (en) * 1981-11-11 1983-05-13 Cerberus Ag SMOKE DETECTOR WITH PULSED OPERATED RADIATION SOURCE
JPS6057494A (en) * 1982-11-29 1985-04-03 ジエンテツクス　コ−ポレ−シヨン Photoelectric type smoke detection/alarm system

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5148297A (en) * 1974-10-22 1976-04-24 Nippon Denso Co Kemurinadono kanchisochi

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5148297A (en) * 1974-10-22 1976-04-24 Nippon Denso Co Kemurinadono kanchisochi

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2516282A1 (en) * 1981-11-11 1983-05-13 Cerberus Ag SMOKE DETECTOR WITH PULSED OPERATED RADIATION SOURCE
JPS6057494A (en) * 1982-11-29 1985-04-03 ジエンテツクス　コ−ポレ−シヨン Photoelectric type smoke detection/alarm system

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