EP1596349A1 - Méthode pour la détection et l'annoncer de la condensation dans des détecteurs de fumée - Google Patents

Méthode pour la détection et l'annoncer de la condensation dans des détecteurs de fumée Download PDF

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Publication number
EP1596349A1
EP1596349A1 EP05008953A EP05008953A EP1596349A1 EP 1596349 A1 EP1596349 A1 EP 1596349A1 EP 05008953 A EP05008953 A EP 05008953A EP 05008953 A EP05008953 A EP 05008953A EP 1596349 A1 EP1596349 A1 EP 1596349A1
Authority
EP
European Patent Office
Prior art keywords
smoke
signal
received signal
condensation
light
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.)
Granted
Application number
EP05008953A
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German (de)
English (en)
Other versions
EP1596349B1 (fr
Inventor
Gerhard Röpke
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.)
Job Lizenz GmbH and Co KG
Original Assignee
Job Lizenz GmbH and Co KG
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 Job Lizenz GmbH and Co KG filed Critical Job Lizenz GmbH and Co KG
Publication of EP1596349A1 publication Critical patent/EP1596349A1/fr
Application granted granted Critical
Publication of EP1596349B1 publication Critical patent/EP1596349B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • G08B29/02—Monitoring continuously signalling or alarm systems
    • G08B29/04—Monitoring of the detection circuits
    • G08B29/043—Monitoring of the detection circuits of fire detection circuits
    • 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

Definitions

  • the invention relates to a method for detecting and reporting Condensations in an optical smoke detector according to the preamble of the claim 1.
  • Fire detection sensors are often used as optical smoke detectors or smoke detectors executed. They usually work according to the Tyndall or scattered light principle. Below a number of prior art documents in which various Smoke detector arrangements are disclosed: US 4,242,673, US 4,232,307, DE 27 54 139 A1, EP 0 076 338 A1, US Pat. No. 4,180,742 and EP 0 360 126.
  • the pollution reproducing measured value can be used to follow threshold, so that the sensitivity of the smoke detector approximate stays the same.
  • a third source of error is that within the smoke detector a condensation takes place.
  • small water droplets are formed on dew germs the surface of the measuring chamber walls and on the optical elements, e.g. Lenses or plastic body of the light emitter or light receiver.
  • the electronic Circuit for evaluating the measured signals in the smoke detector can be very well protect against moisture and can e.g. provided with a protective varnish be cast or in a potting compound.
  • the increased reflection property of the measuring chamber walls due to the moisture coating generates a larger received signal at the photosensitive receiver. If no additional measures are taken, then it comes within the shortest possible time Time to reach the alarm threshold for smoke and thus false alarm.
  • DE 4 307 585 C1 discloses a method and a device for compensating the Moisture has become known in a scattered light detector.
  • a moisture barrier detected on the receiving optics by periodically the smoke density with the first light transmitter and temporally offset the moisture with the second light emitter is measured.
  • the two measured values are processed, the moisture coating the light of the second light transmitter reflects and thus the Receiver output signal as a function of the thickness of the moisture coating weakens.
  • Such an arrangement is also relatively expensive and does not lead with the absolute goal of avoiding the detrimental influence of condensation.
  • the invention has the object, a method for detection and Indicate smoke message that eliminates the effects of condensation or be compensated.
  • the temperature is at or in the detector housing measured, and the time course of the temperature is with the course the output signal of the optical receiver in relation. It will be a so-called Betauungssignal generated when the rise of the received signal with correlated to an increase in temperature.
  • an alarm signal is suppressed when a dew signal is generated becomes.
  • the threshold for the alarm signal in accordance with track the reporting signal when a Betauungssignal been generated is. In this way, a smoke measurement can take place even during the condensation.
  • the detector can be attached to another location, if it tends to condensation in its place, according to one embodiment of the invention the dewing signal is sent to a central office.
  • the central office of the Smoke detectors are identified and, if appropriate, installed at a different location, where the danger of condensation is reduced or not given.
  • the invention is based on the recognition that a condensation in the measuring chamber a smoke detector is basically caused by the fact that the dew point the surface of the Meßhuntraums is reached.
  • a smoke detector 10 is shown very schematically. He has a housing 12, in which a measuring chamber 14 is formed, which at opposite ends at 14 or 16 openings for the entry of smoke. On a circuit board 18, a photosensitive receiver 20 is disposed. He is from a box 22, which has an opening at 24 for the entry of light. In the Board 18, an opening 26 is provided, below which an optical transmitter 28 is arranged is, for example, an LED. The transmitter 28 sends light up into the measuring chamber, across the field of view of the receiver 20, with the reflective light the chamber walls is received as stray light from the receiver 20.
  • a temperature sensor 30 is also arranged to Measurement of the temperature in the housing.
  • the evaluation of the signals of the photosensitive receiver 20 by means of a suitable electronic circuitry; it is not shown in detail. She is known. Usually, a threshold is given, with a Alarm signal is generated when the received signal of the receiver 20 this Threshold reached or exceeded. It can also compensate be provided, the stray light effects caused by other causes will compensate. For this purpose, something is done above.
  • the solid curve 32 is a temperature curve of the temperature sensor 30 reproduced. It indicates that in a certain Period the temperature in the measuring chamber 14 has risen.
  • the dashed Curve 34 is the course of the received signal of the photosensitive receiver 20 which indicates that the incident on the receiver Amount of stray light has increased over a period of time.
  • the optical detector When setting up the optical detector must first the optical property of the Measuring chamber wall by a simple combination of transmitter 28 and receiver 20th being checked.
  • the light rays of the transmitter 28 are from the Meßschwand reflected and registered by the receiver 20.
  • the measuring chamber 14th without condensation e.g. an intensity E1 measured at the receiver 20.
  • the Betauungskeime the light is scattered on the Meßhuntcontactn and increased Intensity, e.g. measured in E2.
  • a temperature rise in the Measuring chamber 14 instead, as indicated by curve 32, this is an indicator that a condensation has taken place in the measuring chamber wall and the increased intensity the reception signal is at least not due solely to smoke.
  • the alarm threshold for Detection of smoke to be tracked. This is not just a false alarm prevents, but it is also still a detection of smoke possible. moreover For example, a signal from the smoke detector 10 may be sent to a central office so that It can be seen which smoke detector suffers from condensation. Possibly The smoke detector can be relocated to a more favorable location.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Fire-Detection Mechanisms (AREA)
EP05008953A 2004-05-13 2005-04-23 Méthode pour la détection et l'annoncer de la condensation dans des détecteurs de fumée Not-in-force EP1596349B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004023524 2004-05-13
DE102004023524A DE102004023524B3 (de) 2004-05-13 2004-05-13 Verfahren zur Erfassung und Meldung von Betauungen in Rauchmeldern

Publications (2)

Publication Number Publication Date
EP1596349A1 true EP1596349A1 (fr) 2005-11-16
EP1596349B1 EP1596349B1 (fr) 2006-07-19

Family

ID=34854135

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05008953A Not-in-force EP1596349B1 (fr) 2004-05-13 2005-04-23 Méthode pour la détection et l'annoncer de la condensation dans des détecteurs de fumée

Country Status (4)

Country Link
US (1) US7209046B2 (fr)
EP (1) EP1596349B1 (fr)
DE (2) DE102004023524B3 (fr)
ES (1) ES2270399T3 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2463837A1 (fr) * 2010-12-09 2012-06-13 Nxp B.V. Détecteur de fumée
US8899097B2 (en) * 2011-10-18 2014-12-02 The Boeing Company Airborne impurities detection

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0418411A1 (fr) * 1989-09-19 1991-03-27 Siemens Aktiengesellschaft Système d'avertissement d'incendie avec un avertisseur combiné
DE4307585C1 (de) * 1993-03-10 1994-03-10 Siemens Ag Verfahren und Vorrichtung zur Kompensation der Feuchtigkeit in einem Streulichtmelder
US5592147A (en) * 1993-06-14 1997-01-07 Wong; Jacob Y. False alarm resistant fire detector with improved performance

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH600456A5 (fr) 1976-12-23 1978-06-15 Cerberus Ag
US4242673A (en) * 1978-03-13 1980-12-30 American District Telegraph Company Optical particle detector
US4180742A (en) * 1978-03-27 1979-12-25 Chloride Incorporated Detector with supervisory signal from monitor cell
US4232307A (en) * 1978-12-18 1980-11-04 American District Telegraph Company Electrical test circuit for optical particle detector
EP0076338A1 (fr) * 1981-10-05 1983-04-13 Gamewell Corporation Détecteur de particules à large spectre
JP2746920B2 (ja) * 1988-07-07 1998-05-06 能美防災株式会社 火災警報装置
DE3831654A1 (de) 1988-09-17 1990-03-22 Hartwig Beyersdorf Optischer rauchmelder
US5482371A (en) * 1991-04-18 1996-01-09 Osaka Sanso Kogyo Ltd. Method and apparatus for measuring the dew point and/or frost point of a gas having low water content
US5568130A (en) * 1994-09-30 1996-10-22 Dahl; Ernest A. Fire detector

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0418411A1 (fr) * 1989-09-19 1991-03-27 Siemens Aktiengesellschaft Système d'avertissement d'incendie avec un avertisseur combiné
DE4307585C1 (de) * 1993-03-10 1994-03-10 Siemens Ag Verfahren und Vorrichtung zur Kompensation der Feuchtigkeit in einem Streulichtmelder
EP0615218A1 (fr) * 1993-03-10 1994-09-14 Siemens Aktiengesellschaft Procédé et dispositif pour la compensation de l'humidité dans un détecteur à dispersion de lumière
US5592147A (en) * 1993-06-14 1997-01-07 Wong; Jacob Y. False alarm resistant fire detector with improved performance

Also Published As

Publication number Publication date
ES2270399T3 (es) 2007-04-01
DE502005000039D1 (de) 2006-08-31
US20050253730A1 (en) 2005-11-17
US7209046B2 (en) 2007-04-24
DE102004023524B3 (de) 2005-09-15
EP1596349B1 (fr) 2006-07-19

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