EP1596349B1 - 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
EP1596349B1
EP1596349B1 EP05008953A EP05008953A EP1596349B1 EP 1596349 B1 EP1596349 B1 EP 1596349B1 EP 05008953 A EP05008953 A EP 05008953A EP 05008953 A EP05008953 A EP 05008953A EP 1596349 B1 EP1596349 B1 EP 1596349B1
Authority
EP
European Patent Office
Prior art keywords
signal
smoke
condensation
reception signal
generated
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.)
Not-in-force
Application number
EP05008953A
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German (de)
English (en)
Other versions
EP1596349A1 (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 condensation in an optical smoke detector according to the preamble of patent claim 1.
  • Fire detection sensors are often designed as optical smoke detectors or smoke detectors. They usually work according to the Tyndall or scattered light principle. The following are a number of prior art documents disclosing various smoke detector assemblies: US 4,242,673, US 4,232,307, DE 27 54 139 A1, EP 0 076 338 A1, US 4,180,742 and EP 0 360 126.
  • the measured value representing the contamination can be used to track the threshold, so that the sensitivity of the smoke detector remains approximately the same.
  • a third source of error is that condensation takes place inside the smoke detector.
  • small water droplets are formed on dew germs on 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 measurement signals in the smoke detector can be very well protected against moisture and can e.g. be provided with a protective coating or cast in a potting compound.
  • the increased reflection property of the measuring chamber walls due to the moisture coating produces a larger received signal at the photosensitive receiver. If no additional measures are taken, it comes within a very short time to reach the alarm threshold for smoke and thus the false alarm.
  • Another possibility is to provide a humidity sensor that measures the humidity in the immediate vicinity of the smoke detector. With increasing operating time there is a risk of contamination of the humidity sensor. Thus, the measurement of humidity is subject to errors. Furthermore, durable and long-lasting humidity sensors are relatively expensive. Finally, it is necessary in the production of fire detectors with humidity sensors to match them accordingly, which increases the production cost.
  • the invention is therefore based on the object of specifying a method for detecting and reporting smoke, in which the effects of condensation are eliminated or compensated.
  • the temperature is measured on or in the detector housing, and the time course of the temperature is related to the course of the output signal of the optical receiver.
  • a so-called dewing signal is generated when the rise of the received signal correlates with a rise in temperature.
  • an alarm signal is suppressed when a dewing signal is generated.
  • the threshold value for the alarm signal can be tracked in accordance with the message signal when a Betauungssignal has been generated. In this way, a smoke measurement can take place even during the condensation.
  • the dewing signal may be sent to a control center.
  • the smoke detector can be identified and, if necessary, installed at another 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 of a smoke detector is basically caused by the fact that the dew point is reached at the surface of Meßhuntraums.
  • a smoke detector 10 is shown very schematically. It has a housing 12 in which a measuring chamber 14 is formed having at opposite ends at 14 and 16 openings for the entry of smoke.
  • a photosensitive receiver 20 is arranged on a circuit board 18. It is surrounded by a box 22 having an opening at 24 for the entry of light.
  • an opening 26 is provided, below which an optical transmitter 28 is arranged, for example an LED. The transmitter 28 sends light up into the measuring chamber, across the field of view of the receiver 20, the reflective light of the chamber walls being received by the receiver 20 as stray light.
  • a temperature sensor 30 is also arranged for measuring the temperature in the housing.
  • the evaluation of the signals of the photosensitive receiver 20 by means of a suitable electronic circuit arrangement; it is not shown in detail. She is known. Usually, a threshold is given, with an alarm signal is generated when the received signal of the receiver 20 this Threshold reached or exceeded. Compensation measures can also be provided which compensate for stray light effects caused by other causes. For this purpose, something is done above.
  • a temperature curve of the temperature sensor 30 is shown with the solid curve 32. It indicates that in a certain period of time the temperature in the measuring chamber 14 has risen. With the dashed curve 34, the course of the received signal of the photosensitive receiver 20 is reproduced, indicating that the incident on the receiver amount of stray light has increased over a period of time.
  • the optical property of the measuring chamber wall must first be checked by a simple combination of transmitter 28 and receiver 20.
  • the light beams of the transmitter 28 are reflected by the measuring chamber wall and registered by the receiver 20.
  • an intensity E1 measured at the receiver 20 By the dew germs the light is scattered at the measuring chamber walls and an increased intensity, e.g. measured in E2.
  • the alarm threshold for detecting smoke can be tracked. This not only prevents a false alarm, but it is also possible to detect smoke.
  • a signal can be sent from the smoke detector 10 to a central office, so that it can be seen which smoke detector is suffering from dewing. If necessary, the smoke detector can be relocated to a more favorable location.

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  • 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)

Claims (4)

  1. Procédé de détection et d'avertissement de fumée à l'aide d'un dispositif optique dans un boîtier d'avertisseur, le dispositif optique comportant au moins un élément émetteur optique et au moins un élément récepteur optique qui émet un signal de réception représentatif de la quantité de lumière incidente, un dispositif électronique d'interprétation comparant alors le signal de réception à une valeur de consigne, et un signal d'alarme étant émis, si le signal de réception atteint la valeur de seuil prédéfinie,
    caractérisé en ce que
    la température est mesurée au niveau du ou dans le boîtier d'avertisseur (12), et l'évolution dans le temps de la température (32) est comparée à l'évolution dans le temps du signal de réception (34) de l'élément optique de réception (20) et un signal de rosée est produit, si la montée du signal de réception est en corrélation avec une augmentation de la température.
  2. Procédé suivant la revendication 1, caractérisé en ce que la création d'un signal d'alarme est bloquée si un signal de rosée a été produit.
  3. Procédé suivant la revendication 1 ou 2, caractérisé en ce que la valeur de seuil est réajustée en fonction de la grandeur du signal de réception si un signal de rosée a été produit.
  4. Procédé suivant l'une des revendications 1 à 3, caractérisé en ce que le signal de rosée, ou l'apparition d'un signal de rosée, sont envoyés à une centrale.
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 EP1596349A1 (fr) 2005-11-16
EP1596349B1 true 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

Family Cites Families (12)

* 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
DE58907131D1 (de) * 1989-09-19 1994-04-07 Siemens Ag Brandmeldeanlage mit einem Kombinationsmelder.
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
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
US5568130A (en) * 1994-09-30 1996-10-22 Dahl; Ernest A. Fire detector

Also Published As

Publication number Publication date
DE502005000039D1 (de) 2006-08-31
US7209046B2 (en) 2007-04-24
ES2270399T3 (es) 2007-04-01
US20050253730A1 (en) 2005-11-17
DE102004023524B3 (de) 2005-09-15
EP1596349A1 (fr) 2005-11-16

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