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ATE142807T1 - METHOD AND DEVICE FOR COMPENSATING MOISTURE IN A SCATTERED LIGHT DETECTOR - Google Patents

METHOD AND DEVICE FOR COMPENSATING MOISTURE IN A SCATTERED LIGHT DETECTOR

Info

Publication number
ATE142807T1
ATE142807T1 AT94103217T AT94103217T ATE142807T1 AT E142807 T1 ATE142807 T1 AT E142807T1 AT 94103217 T AT94103217 T AT 94103217T AT 94103217 T AT94103217 T AT 94103217T AT E142807 T1 ATE142807 T1 AT E142807T1
Authority
AT
Austria
Prior art keywords
light
receiver
light transmitter
moisture
scattered light
Prior art date
Application number
AT94103217T
Other languages
German (de)
Inventor
Otfried Post
Original Assignee
Siemens Ag
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 Siemens Ag filed Critical Siemens Ag
Application granted granted Critical
Publication of ATE142807T1 publication Critical patent/ATE142807T1/en

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
    • G08B29/18—Prevention or correction of operating errors
    • G08B29/20—Calibration, including self-calibrating arrangements
    • G08B29/24—Self-calibration, e.g. compensating for environmental drift or ageing of components
    • 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
    • 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
    • G08B17/11—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using an ionisation chamber for detecting smoke or gas
    • G08B17/113—Constructional details

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Fire-Detection Mechanisms (AREA)

Abstract

The compensating method involves using a second light transmitter(LS2) is provided, which with the existing light receiver(LE) detects a moisture coating on the receiver optic(EL). Whilst periodically the smoke density(MWR) is measured with t he first light transmitter(LS1), and at times alternates with the humidity(MWF) measured with the first light transmitter(LS2). The two measurement values are processed. The second light transmitter is arranged in the direct vicinity of the light receiver(LE) or its receiver optic(EL), such that the transmitted light brushes the receiver optic(EL) approximately tangentially, and the moisture coating(WT) reflects the light of the second light transmitter. So that the receiver output signal weakens, depending on the thickness of the moisture coating.
AT94103217T 1993-03-10 1994-03-03 METHOD AND DEVICE FOR COMPENSATING MOISTURE IN A SCATTERED LIGHT DETECTOR ATE142807T1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE4307585A DE4307585C1 (en) 1993-03-10 1993-03-10 Compensating for air humidity in stray light signal unit for fire alarm system - contg. first light transmitter with associated optic and light receiver with associated optic with its output signal representing measured value of smoke density

Publications (1)

Publication Number Publication Date
ATE142807T1 true ATE142807T1 (en) 1996-09-15

Family

ID=6482440

Family Applications (1)

Application Number Title Priority Date Filing Date
AT94103217T ATE142807T1 (en) 1993-03-10 1994-03-03 METHOD AND DEVICE FOR COMPENSATING MOISTURE IN A SCATTERED LIGHT DETECTOR

Country Status (6)

Country Link
EP (1) EP0615218B1 (en)
AT (1) ATE142807T1 (en)
DE (2) DE4307585C1 (en)
DK (1) DK0615218T3 (en)
ES (1) ES2091645T3 (en)
GR (1) GR3021486T3 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5781291A (en) * 1996-10-22 1998-07-14 Pittway Corporation Smoke detectors utilizing a hydrophilic substance
DE19912911C2 (en) * 1999-03-22 2001-07-19 Schako Metallwarenfabrik Device for detecting smoke
DE102004020489B4 (en) * 2004-04-26 2007-06-28 Minimax Gmbh & Co. Kg Fire detector for use in outdoor atmosphere
DE102004023524B3 (en) 2004-05-13 2005-09-15 Job Lizenz Gmbh & Co. Kg Smoke and mist detection device for activation of fire alarm and sprinkler system in building has chamber with grilles at ends containing support for photosensor and indirect illumination LED
DE102004032294B4 (en) * 2004-07-03 2012-02-09 Minimax Gmbh & Co. Kg Heated fire alarm
EP3899501B1 (en) 2020-02-05 2023-06-07 Durag GmbH Device for the scattered light measurement of particles in a gas

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH571750A5 (en) * 1974-09-10 1976-01-15 Nohmi Bosai Kogyo Co Ltd Photoelectricccc aerosol or smoke detector - second photo cell receives reflected light from prism surface to compensate for contamination
DE58908329D1 (en) * 1989-09-19 1994-10-13 Siemens Ag Method and device for compensating for air humidity in an optical smoke detector.

Also Published As

Publication number Publication date
EP0615218B1 (en) 1996-09-11
EP0615218A1 (en) 1994-09-14
DE4307585C1 (en) 1994-03-10
DK0615218T3 (en) 1996-11-04
DE59400613D1 (en) 1996-10-17
GR3021486T3 (en) 1997-01-31
ES2091645T3 (en) 1996-11-01

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Legal Events

Date Code Title Description
REN Ceased due to non-payment of the annual fee