BE818322A - Smoke detector utilising Tyndall effect - uses pulsed light source and voltage responsive to light pulses - Google Patents

Smoke detector utilising Tyndall effect - uses pulsed light source and voltage responsive to light pulses

Info

Publication number
BE818322A
BE818322A BE147142A BE147142A BE818322A BE 818322 A BE818322 A BE 818322A BE 147142 A BE147142 A BE 147142A BE 147142 A BE147142 A BE 147142A BE 818322 A BE818322 A BE 818322A
Authority
BE
Belgium
Prior art keywords
smoke detector
light source
voltage responsive
tyndall effect
uses pulsed
Prior art date
Application number
BE147142A
Other languages
French (fr)
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 filed Critical
Publication of BE818322A publication Critical patent/BE818322A/en

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
    • 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

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)
  • Fire-Detection Mechanisms (AREA)

Abstract

The voltage means is connected to a level detector, producing an output signal when the voltage level exceeds a given value. This signal is passed to a multivibrator cct. which is itself connected to an alarm unit. Voltage levels are assessed by a differential comparator.
BE147142A 1973-11-26 1974-07-31 Smoke detector utilising Tyndall effect - uses pulsed light source and voltage responsive to light pulses BE818322A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US41920673A 1973-11-26 1973-11-26

Publications (1)

Publication Number Publication Date
BE818322A true BE818322A (en) 1974-11-18

Family

ID=23661257

Family Applications (1)

Application Number Title Priority Date Filing Date
BE147142A BE818322A (en) 1973-11-26 1974-07-31 Smoke detector utilising Tyndall effect - uses pulsed light source and voltage responsive to light pulses

Country Status (2)

Country Link
BE (1) BE818322A (en)
ZA (1) ZA745122B (en)

Also Published As

Publication number Publication date
ZA745122B (en) 1975-09-24

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Legal Events

Date Code Title Description
RE Patent lapsed

Owner name: PYROTECTOR INC.

Effective date: 19840731