EP1596349A1 - Method for sensing and reporting of condensation in smoke detectors - Google Patents
Method for sensing and reporting of condensation in smoke detectors Download PDFInfo
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- 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
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- smoke
- signal
- received signal
- condensation
- light
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- 239000000779 smoke Substances 0.000 title claims abstract description 38
- 238000009833 condensation Methods 0.000 title claims description 17
- 230000005494 condensation Effects 0.000 title claims description 17
- 238000000034 method Methods 0.000 title claims description 9
- 230000003287 optical effect Effects 0.000 claims description 14
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 238000011156 evaluation Methods 0.000 claims description 2
- 239000002245 particle Substances 0.000 abstract description 3
- 239000003595 mist Substances 0.000 abstract 2
- 238000005286 illumination Methods 0.000 abstract 1
- 238000011109 contamination Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 244000052616 bacterial pathogen Species 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000000875 corresponding effect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000001795 light effect Effects 0.000 description 1
- 230000005923 long-lasting effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000004382 potting Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002966 varnish Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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.
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- Engineering & Computer Science (AREA)
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Fire-Detection Mechanisms (AREA)
Abstract
Description
Die Erfindung bezieht sich auf ein Verfahren zur Erfassung und Meldung von Betauungen in einem optischen Rauchmelder nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a method for detecting and reporting Condensations in an optical smoke detector according to the preamble of the claim 1.
Brandmeldesensoren sind häufig als optische Rauchmelder oder Rauchdetektoren ausgeführt. Sie arbeiten zumeist nach dem Tyndall- oder Streulichtprinzip. Nachstehend eine Anzahl von Schriften zum Stand der Technik, in der verschiedene Rauchmelderanordnungen offenbart sind: US 4,242,673, US 4,232,307, DE 27 54 139 A1, EP 0 076 338 A1, US 4,180,742 und EP 0 360 126.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.
Fehlerquellen für die Erfassung von Rauch mit Hilfe derartiger Rauchmelder ist Stör- oder Streulicht, das nicht von Rauchpartikeln herrührt. So kann von außen in das Meldergehäuse eintretende Licht zur Erzeugung eines Alarmsignals führen. Es wird daher bei derartigen Meldergehäusen angestrebt, daß nach Möglichkeit gar kein oder nur sehr wenig Außenlicht in die Meßstrecke hineingelangt. Da das Meldergehäuse jedoch ausreichend Öffnungen aufweisen muß, durch die Rauchpartikel eindringen können, läßt sich der Eintritt von Störlicht nicht gänzlich vermeiden.Sources of error for the detection of smoke with the help of such smoke detectors is interference or stray light that does not come from smoke particles. So from the outside in the Detector housing incoming light to generate an alarm signal. It will Therefore sought in such detector housings that, if possible, no or only very little outside light came into the test section. Because the detector housing but must have sufficient openings through which smoke particles penetrate can not be completely avoided the entry of stray light.
Eine weitere Quelle von Störlicht ist die Verschmutzung der Melderkammer. Auf den Wänden des Meldergehäuses ablagernder Schmutz führt zu einer Verstärkung des Streulichts. Je höher der Verschmutzungsgrad ist, je stärker der Streulichtanteil, der hiervon verursacht ist. Ab einem bestimmten Verschmutzungsgrad ist daher mit der Erzeugung eines Alarmsignals zurechnen, wenn keine Gegenmaßnahmen getroffen werden. Die Erzeugung von fälschlich generierten Alarmsignalen ist jedoch in jedem Falle zu vermeiden, weil sie für den Betreiber einer Anlage aus Rauchdetektoren wegen des Einsatzes der Feuerwehr kostspielig werden kann. In der bereits genannten EP 0 360 126 wird daher eine wirksame Anordnung vorgeschlagen, mit deren Hilfe die Verschmutzung der Meßkammerwände detektiert wird. Dies geschieht dadurch, daß die Reflexion einer bestrahlten Fläche einer Meßkammerwand detektiert und ausgewertet wird. Mit steigender Verschmutzung steigt der Reflexionsgrad an. Der die Verschmutzung wiedergebende Meßwert kann dazu verwendet werden, den Schwellwert nachzuführen, so daß die Empfindlichkeit des Rauchmelders annähernd gleich bleibt. Es ist jedoch auch möglich, durch Messung der Meßkammerverschmutzung ein Alarmsignal zu erzeugen, das vorzugsweise zu einer Meldezentrale gegeben wird, damit der verschmutze Melder ausgetauscht bzw. gereinigt wird.Another source of stray light is the contamination of the detector chamber. On the Walls of the detector housing depositing dirt leads to a reinforcement of the Scattered light. The higher the degree of contamination, the stronger the amount of scattered light, the caused by this. From a certain degree of pollution is therefore with the Generate an alarm signal if no countermeasures are taken become. However, the generation of incorrectly generated alarm signals is in each Avoid trap because they are the operator of a smoke detector system because of the use of the fire department can be expensive. In the already mentioned EP 0 360 126 therefore proposes an effective arrangement with the aid of which the contamination of the Meßkammerwände is detected. This happens by that the reflection of an irradiated surface of a Meßkammerwand detected and is evaluated. With increasing pollution, the reflectance increases. Of the The pollution reproducing measured value can be used to Follow threshold, so that the sensitivity of the smoke detector approximate stays the same. However, it is also possible by measuring the measuring chamber contamination to generate an alarm signal, preferably to a message center is given so that the polluted detector replaced or cleaned becomes.
Eine dritte Fehlerquelle besteht darin, daß innerhalb des Rauchmelders eine Betauung stattfindet. In diesem Fall entstehen kleine Wassertröpfchen an Betauungskeimen an der Oberfläche der Meßkammerwände und an den optischen Elementen, wie z.B. Linsen oder Kunststoffkörper der Lichtsender bzw. Lichtempfänger. Die elektronische Schaltung zur Auswertung der Meßsignale im Rauchmelder läßt sich hingegen sehr gut gegen Feuchtigkeit schützen und kann z.B. mit einem Schutzlack versehen werden oder in einer Vergußmasse vergossen werden.A third source of error is that within the smoke detector a condensation takes place. In this case, 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, however, can be very well protect against moisture and can e.g. provided with a protective varnish be cast or in a potting compound.
Die erhöhte Reflexionseigenschaft der Meßkammerwände aufgrund des Feuchtigkeitsbelages erzeugt ein größeres Empfangssignal am lichtempfindlichen Empfänger. Werden keine zusätzlichen Maßnahmen getroffen, so kommt es innerhalb kürzester Zeit zum Erreichen der Alarmschwelle für Rauch und damit zum Fehlalarm.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.
Es ist bekannt, konstruktive Maßnahmen zur Ausbildung eines Rauchkammergehäuses bzw. einer Meßkammer vorzusehen, sowie eine spezifische Anordnung der optischen Elemente, mit denen eine Betauung und damit ein Fehlalarm verhindert werden soll. Es ist jedoch einsehbar, daß letztlich eine Betauung nicht verhindert werden kann. Daher wurde auch bereits vorgeschlagen, derartige Melder mit einem Heizelement zu versehen. Das Heizelement erfordert jedoch einen entsprechenden Energiebedarf. Außerdem verändert es das Eindringverhalten des Rauchs in die Meßkammer des Rauchmelders.It is known constructive measures for the formation of a smoke chamber housing or to provide a measuring chamber, and a specific arrangement of optical elements that prevent condensation and thus a false alarm shall be. However, it is visible that ultimately does not prevent condensation can be. Therefore, it has also been proposed, such detectors with a To provide heating element. However, the heating element requires a corresponding Energy demand. It also changes the penetration of the smoke into the measuring chamber of the smoke detector.
Eine weitere Möglichkeit besteht darin, einen Feuchtesensor vorzusehen, der die Feuchtigkeit in unmittelbarer Umgebung des Rauchmelders mißt. Bei zunehmender Betriebsdauer besteht die Gefahr der Verschmutzung des Feuchtesensors. Damit ist auch die Messung der Luftfeuchtigkeit mit Fehlern behaftet. Ferner sind beständige und langlebige Feuchtesensoren relativ aufwendig. Schließlich ist erforderlich, bei der Herstellung von Brandmeldern mit Feuchtesensoren diese entsprechend abzugleichen, was den Fertigungsaufwand erhöht.Another possibility is to provide a humidity sensor, the Moisture in the immediate vicinity of the smoke detector measures. With increasing Operating life there is a risk of contamination of the humidity sensor. This is Also, the measurement of humidity with errors. Furthermore, they are stable and long-lasting humidity sensors relatively expensive. Finally, it is necessary at the Manufacture of fire detectors with humidity sensors to match them accordingly, which increases the production costs.
Aus DE 4 307 585 C1 ist ein Verfahren und eine Vorrichtung zur Kompensation der Feuchtigkeit in einem Streulichtmelder bekannt geworden. Mit Hilfe eines weiteren Lichtsenders und dem bereits vorhandenen Lichtempfänger wird ein Feuchtigkeitsbelag auf der Empfangsoptik detektiert, indem periodisch die Rauchdichte mit dem ersten Lichtsender und dazu zeitlich versetzt die Feuchtigkeit mit dem zweiten Lichtsender gemessen wird. Die beiden Meßwerte werden verarbeitet, wobei der Feuchtigkeitsbelag das Licht des zweiten Lichtsenders reflektiert und damit das Empfängerausgangssignal in Abhängigkeit von der Stärke des Feuchtigkeitsbelages schwächt. Eine derartige Anordnung ist ebenfalls relativ aufwendig und führt nicht mit absoluter Sicherheit zum Ziel, den schädlichen Einfluß der Betauung zu vermeiden.DE 4 307 585 C1 discloses a method and a device for compensating the Moisture has become known in a scattered light detector. With the help of another Light transmitter and the existing light receiver is 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.
Daher liegt der Erfindung die Aufgabe zugrunde, ein Verfahren zur Erfassung und Meldung von Rauch anzugeben, bei dem die Einflüsse durch Betauung eliminiert bzw. kompensiert werden. Therefore, the invention has the object, a method for detection and Indicate smoke message that eliminates the effects of condensation or be compensated.
Diese Aufgabe wird durch die Merkmale des Patentanspruchs 1 gelöst.This object is solved by the features of patent claim 1.
Bei dem erfindungsgemäßen Verfahren wird die Temperatur an oder im Meldergehäuse gemessen, und der zeitliche Verlauf der Temperatur wird mit dem Verlauf des Ausgangssignals des optischen Empfängers in Beziehung gesetzt. Es wird ein sogenanntes Betauungssignal erzeugt, wenn der Anstieg des Empfangssignals mit einem Anstieg der Temperatur korreliert.In the method according to the invention, 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.
Vorzugsweise wird ein Alarmsignal unterdrückt, wenn ein Betauungssignal erzeugt wird. Zusätzlich oder alternativ kann der Schwellwert für das Alarmsignal nach Maßgabe des Meldesignals nachgeführt werden, wenn ein Betauungssignal erzeugt worden ist. Auf diese Weise kann auch während der Betauung eine Rauchmessung stattfinden.Preferably, an alarm signal is suppressed when a dew signal is generated becomes. Additionally or alternatively, 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.
Damit der Melder gegebenenfalls an einen anderen Ort angebracht werden kann, wenn er an seinem Ort zur Betauung neigt, kann nach einer Ausgestaltung der Erfindung das Betauungssignal an eine Zentrale gesendet werden. In der Zentrale kann der Rauchmelder identifiziert und gegebenenfalls an einem anderen Ort angebracht werden, wo die Gefahr der Betauung vermindert oder nicht gegeben ist.If necessary, 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. In 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.
Die Erfindung geht von der Erkenntnis aus, daß eine Betauung in der Meßkammer eines Rauchmelders grundsätzlich dadurch hervorgerufen wird, daß der Taupunkt an der Oberfläche des Meßkammerraums erreicht wird.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 Meßkammerraums is reached.
Steigt die Intensität des empfangenen reflektierenden Lichts am Empfänger an, so zeigt dies das Vorhandensein von Rauch an, wenn man alle Störeinflüsse außen vor läßt. Eine Betauung führt ebenfalls zu einer Erhöhung des Streulichts und kann daher das Eindringen von Rauch vortäuschen. Wird nun mit ansteigendem Empfangssignal, das ein erhöhtes Streulicht repräsentiert, gleichzeitig ein Anstieg der Temperatur gemessen, ist dies ein Indikator dafür, daß eine Betauung in der Meßkammer vorliegt.If the intensity of the received reflected light at the receiver increases, then this indicates the presence of smoke, excluding all disturbances leaves. A condensation also leads to an increase in the scattered light and therefore can pretend the ingress of smoke. Will now with rising receive signal, which represents an increased scattered light, at the same time an increase in the temperature measured, this is an indicator that there is a condensation in the measuring chamber.
Die Erfindung soll nachfolgend anhand von Zeichnungen näher erläutert werden.
- Fig. 1
- zeigt äußerst schematisch einen optischen Rauchmelder nach der Erfindung.
- Fig. 2
- zeigt den zeitlichen Verlauf eines Meldersignals und der Temperatur in der Meßkammer.
- Fig. 1
- shows very schematically an optical smoke detector according to the invention.
- Fig. 2
- shows the time course of a detector signal and the temperature in the measuring chamber.
In Fig. 1 ist ein Rauchmelder 10 äußerst schematisch dargestellt. Er weist ein Gehäuse
12 auf, in dem eine Meßkammer 14 ausgebildet ist, die an gegenüberliegenden Enden
bei 14 bzw. 16 Öffnungen aufweist für den Eintritt von Rauch. Auf einer Schaltplatine
18 ist ein lichtempfindlicher Empfänger 20 angeordnet. Er ist von einer Box
22 umgeben, die bei 24 eine Öffnung aufweist für den Eintritt von Licht. In der
Platine 18 ist eine Öffnung 26 vorgesehen, unter der ein optischer Sender 28 angeordnet
ist, beispielsweise eine LED. Der Sender 28 sendet Licht nach oben in die Meßkammer,
quer zum Gesichtsfeld des Empfängers 20, wobei das reflektierende Licht
der Kammerwände als Streulicht vom Empfänger 20 aufgenommen wird.In Fig. 1, a
In der Meßkammer 14 ist außerdem ein Temperatursensor 30 angeordnet, zur
Messung der Temperatur in dem Gehäuse.In the measuring
Die Auswertung der Signale des lichtempfindlichen Empfängers 20 mit Hilfe einer
geeigneten elektronischen Schaltungsanordnung; sie ist im einzelnen nicht dargestellt.
Sie ist an sich bekannt. Üblicherweise wird ein Schwellwert vorgegeben, wobei ein
Alarmsignal erzeugt wird, wenn das Empfangssignal des Empfängers 20 diesen
Schwellwert erreicht bzw. überschreitet. Es können auch Kompensationsmaßnahmen
vorgesehen werden, die Streulichteinflüsse, die durch andere Ursachen hervorgerufen
werden, kompensieren. Hierzu ist weiter oben einiges ausgeführt.The evaluation of the signals of the
In dem Diagramm nach Fig. 2 ist mit der durchgezogenen Kurve 32 eine Temperaturkurve
des Temperaturfühlers 30 wiedergegeben. Sie zeigt an, daß in einem gewissen
Zeitraum die Temperatur in der Meßkammer 14 angestiegen ist. Mit der gestrichelten
Kurve 34 ist der Verlauf des Empfangssignals des lichtempfindlichen Empfängers 20
wiedergegeben, wodurch angezeigt ist, daß die auf dem Empfänger auftreffende
Menge Störlicht im Verlauf eines Zeitraums zugenommen hat.In the diagram of FIG. 2, the
Bei der Einrichtung des optischen Melders muß zunächst die optische Eigenschaft der
Meßkammerwand durch eine einfache Kombination aus Sender 28 und Empfänger 20
geprüft werden. Die Lichtstrahlen des Senders 28 werden von der Meßkammerwand
reflektiert und vom Empfänger 20 registriert. Im Neuzustand der Meßkammer 14
ohne Betauung wird z.B. eine Intensität E1 am Empfänger 20 gemessen. Durch die
Betauungskeime wird das Licht an den Meßkammerwänden gestreut und eine erhöhte
Intensität, z.B. in E2 gemessen. Findet zugleich ein Temperaturanstieg in der
Meßkammer 14 statt, wie durch Kurve 32 angezeigt, ist dies ein Indikator dafür, daß
eine Betauung in der Meßkammerwand stattgefunden hat und die erhöhte Intensität
des Empfangssignals zumindest nicht alleine auf Rauch zurückzuführen ist.When setting up the optical detector must first the optical property of the
Measuring chamber wall by a simple combination of
Mit Hilfe des Empfangssignal des Empfängers 20 kann die Alarmschwelle zur
Detektierung von Rauch nachgeführt werden. Damit wird nicht nur ein Fehlalarm
verhindert, sondern es ist auch noch eine Detektierung von Rauch möglich. Zudem
kann ein Signal von dem Rauchmelder 10 an eine Zentrale gesendet werden, so daß
dort erkennbar ist, welcher Rauchmelder unter einer Betauung leidet. Gegebenenfalls
kann der Rauchmelder an einen günstigeren Ort verlegt werden.With the help of the received signal of the
Claims (4)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102004023524 | 2004-05-13 | ||
| DE102004023524A DE102004023524B3 (en) | 2004-05-13 | 2004-05-13 | 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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1596349A1 true EP1596349A1 (en) | 2005-11-16 |
| EP1596349B1 EP1596349B1 (en) | 2006-07-19 |
Family
ID=34854135
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP05008953A Expired - Lifetime EP1596349B1 (en) | 2004-05-13 | 2005-04-23 | Method for sensing and reporting of condensation in smoke detectors |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US7209046B2 (en) |
| EP (1) | EP1596349B1 (en) |
| DE (2) | DE102004023524B3 (en) |
| ES (1) | ES2270399T3 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2463837A1 (en) * | 2010-12-09 | 2012-06-13 | Nxp B.V. | Smoke detector |
| US8899097B2 (en) * | 2011-10-18 | 2014-12-02 | The Boeing Company | Airborne impurities detection |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0418411A1 (en) * | 1989-09-19 | 1991-03-27 | Siemens Aktiengesellschaft | Fire alarm system with a combination sounder |
| DE4307585C1 (en) * | 1993-03-10 | 1994-03-10 | Siemens Ag | 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 |
| US5592147A (en) * | 1993-06-14 | 1997-01-07 | Wong; Jacob Y. | False alarm resistant fire detector with improved performance |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH600456A5 (en) | 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 (en) * | 1981-10-05 | 1983-04-13 | Gamewell Corporation | Broad-spectrum particle detector |
| JP2746920B2 (en) * | 1988-07-07 | 1998-05-06 | 能美防災株式会社 | Fire alarm |
| DE3831654A1 (en) * | 1988-09-17 | 1990-03-22 | Hartwig Beyersdorf | OPTICAL SMOKE DETECTOR |
| 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 |
-
2004
- 2004-05-13 DE DE102004023524A patent/DE102004023524B3/en not_active Expired - Fee Related
-
2005
- 2005-04-23 ES ES05008953T patent/ES2270399T3/en not_active Expired - Lifetime
- 2005-04-23 DE DE502005000039T patent/DE502005000039D1/en not_active Expired - Lifetime
- 2005-04-23 EP EP05008953A patent/EP1596349B1/en not_active Expired - Lifetime
- 2005-05-12 US US11/127,504 patent/US7209046B2/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0418411A1 (en) * | 1989-09-19 | 1991-03-27 | Siemens Aktiengesellschaft | Fire alarm system with a combination sounder |
| DE4307585C1 (en) * | 1993-03-10 | 1994-03-10 | Siemens Ag | 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 |
| EP0615218A1 (en) * | 1993-03-10 | 1994-09-14 | Siemens Aktiengesellschaft | Method and device for compensation of the moisture in a light scattering detector |
| 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 |
|---|---|
| US20050253730A1 (en) | 2005-11-17 |
| DE502005000039D1 (en) | 2006-08-31 |
| US7209046B2 (en) | 2007-04-24 |
| DE102004023524B3 (en) | 2005-09-15 |
| EP1596349B1 (en) | 2006-07-19 |
| ES2270399T3 (en) | 2007-04-01 |
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