JPS5497476A - Transmitted light type smoke detector - Google Patents

Transmitted light type smoke detector

Info

Publication number
JPS5497476A
JPS5497476A JP463978A JP463978A JPS5497476A JP S5497476 A JPS5497476 A JP S5497476A JP 463978 A JP463978 A JP 463978A JP 463978 A JP463978 A JP 463978A JP S5497476 A JPS5497476 A JP S5497476A
Authority
JP
Japan
Prior art keywords
output
capacitor
light emitting
emitting device
amplifier
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
JP463978A
Other languages
Japanese (ja)
Inventor
Kiyomi Murai
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.)
Omron Corp
Original Assignee
Omron Tateisi Electronics Co
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 Omron Tateisi Electronics Co filed Critical Omron Tateisi Electronics Co
Priority to JP463978A priority Critical patent/JPS5497476A/en
Publication of JPS5497476A publication Critical patent/JPS5497476A/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 realize stable operation at small current consumption and without output fluctuations, by controlling the accumulated charge of capacitor according to the photo reception output, and lighting and driving the light emitting device with this capacitor output. CONSTITUTION:Through a transistor Tr of which base is set to ON periodically by the pulse signal from a pulse lighting circuit 8, a light emitting device 1 is lit in pulses at a specified period. The light of the light emitting device 1 transmits through the smoke and is detected by a photo detector 2 to be sent into an amplifier 3 and a level judging circuit 4. If it is less than the set threshold value, an alarm circuit 5 is operated. The output of the amplifier 3 is integrated for a long period in an integrator 6. The voltage inversely proportional to the output voltage of the integrator 6 outputted from an inverting type direct-current amplifier 7 is gradually charged in a capacitor C through resistance R1 for time constant while Tr is in OFF state. When Tr is ON, the charge in the capacitor C is discharged through Tr and resistance R2 for current limitation, so that the device 1 is lit up in pulses.
JP463978A 1978-01-19 1978-01-19 Transmitted light type smoke detector Pending JPS5497476A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP463978A JPS5497476A (en) 1978-01-19 1978-01-19 Transmitted light type smoke detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP463978A JPS5497476A (en) 1978-01-19 1978-01-19 Transmitted light type smoke detector

Publications (1)

Publication Number Publication Date
JPS5497476A true JPS5497476A (en) 1979-08-01

Family

ID=11589554

Family Applications (1)

Application Number Title Priority Date Filing Date
JP463978A Pending JPS5497476A (en) 1978-01-19 1978-01-19 Transmitted light type smoke detector

Country Status (1)

Country Link
JP (1) JPS5497476A (en)

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