EP1777670B1 - Smoke detector - Google Patents
Smoke detector Download PDFInfo
- Publication number
- EP1777670B1 EP1777670B1 EP06020998A EP06020998A EP1777670B1 EP 1777670 B1 EP1777670 B1 EP 1777670B1 EP 06020998 A EP06020998 A EP 06020998A EP 06020998 A EP06020998 A EP 06020998A EP 1777670 B1 EP1777670 B1 EP 1777670B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- light
- intensity
- signal
- reflector
- smoke
- 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
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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
- 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
-
- 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
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- 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
Definitions
- the invention relates to a smoke detector, which is insensitive to interference from extraneous light or unwanted reflections.
- a fail-safe smoke detector (1) it is proposed to form the sensor system as a reflex light barrier, so that a light signal (6) is constantly emitted by a light transmitter (2) onto a reflector (5).
- the reflector reflects the signal as a reflection (7) on a light receiver (3).
- the light signal (6) is intensity-modulated with a fixed clock frequency.
- the received signal (7) can be recognized at its clock frequency, so that extraneous light is excluded for signal evaluation in the electronics (4).
- Particularly suitable for the signal evaluation proposed in the German Patent DE 103 00 223 B3 the disclosure content of which is to be included in the disclosure content of this application, to use the described measuring arrangement and method for the phase-correct compensation of a signal.
- the smoke detector according to the invention constantly emits a light signal (6) and evaluates its reflection (7), further reflections interfere within of the housing, the measurement, because they are detected as a reflection of the transmitted signal (6) and evaluated as such in the measurement. By contrast, penetrating extraneous light does not participate in the measurement.
- the reflector (5) may simply be an untreated wall or part of the housing. Because the smoke detector can adjust to the reflector, as explained below in the description of the "maintenance cycle".
- the reflector can also be a reflective foil made of microspheres or microtriples, but especially as a microcube reflector, as in the DE 197 27 527 C2 , the disclosure content of which is to be included in the disclosure content of this application, is described, because these are suitable as "IMOS" reflectors on the market cubic reflectors for maximum ranges for Reflexsensorsysteme, in particular those in the DE 102 16 579 A1 and EP 1 251 367 B1 , the disclosure content of which is to be included in the disclosure content of this application, described IMOS wide-angle reflectors are preferred as a reflective surface, if over an arc of well over 80 °, for example, with the HALIOS system, the reflector should be observed.
- the smoke detector can be designed for the smallest observation areas, for example within a small machine and also in large workshops for monitoring of distances of over 100 m. Because of the reflector, the possible distance between the light emitter (2) and the reflector (5) can be varied considerably. This advantage is obtained by the smoke detector in that it does not use the previous sensor system that detects reflections, but rather its novel system, which initially relies on the measuring system used to emit a continuous measuring beam and also to constantly receive it as a reflection.
- the smoke detector does not lose its function due to dust accumulation due to dust accumulation or due to aging of the electronic components changes measured values that could lead to malfunctions, it regularly switches between a work cycle and a maintenance cycle.
- the work cycle can be described particularly well, based on the HALIOS principle mentioned above.
- the emitted signal (6) is readjusted using a compensation LED when the reflection signal (7) has changed. This means that if a readjustment in the work cycle is required, then the beam path has been disturbed, for example by smoke or smoke particles.
- the smoke detector triggers an alarm.
- the duty cycle has a tolerance range in which it does not readjust, that is, the duty cycle depends on the disturbance. Only from a certain disturbance alarm is triggered.
- the aging of the electronic components and the changes on the reflector (5) are compensated by low dust deposits. Because the work cycle is interrupted. In the maintenance cycle, the measuring electronics are allowed, even below the threshold value, which would trigger an alarm if exceeded, to readjust. This means that the smoke detector finds a new state of equilibrium by readjustment. The readjustment in the maintenance state does not lead to the alarm. In addition, before judging maintenance, a vibrator or blower can remove the deposited dust from the smoke detector. In a very small construction, it is proposed to use a micropump as a blower. This requires little energy, so that even battery-powered smoke detectors according to the invention can clean themselves during the maintenance cycle.
- This smoke detector described here thus solves fundamental problems of the detection of smoke. He is not disturbed by extraneous light. He is special when using the HALIOS measuring principle during the working cycle, very sensitive to smoke and smoke particles, because any change in the reflected beam (7) would then lead to readjustment if the change were outside the tolerance range. In the maintenance phase, however, there is no tolerance range, but it is mandatory to readjusted to find a new balance of the measuring system. This newly adjusted balance serves as the starting condition for the following new cycle.
- the novel smoke detector also has no problem with unwanted reflections of its transmission signal (6) within its housing (8). For he recognizes these reflections as emitted by him and as part of his reception measurement in the light receiver (3).
- the smoke detector does not need a darkroom in the housing as before, no extraneous light protection and no measures to suppress reflections.
- the smoke detector can free itself of dust deposits in the maintenance phase, can adapt to slowly progressive changes in its environmental situation and / or aging and power consumption of electronic components by readjustment during the maintenance cycle.
- the smoke detector indicate its duty cycle and / or maintenance cycle by, for example, an LED. It is particularly suitable that the smoke detector gives a signal for manual maintenance by a maintenance expert after a predetermined number of maintenance cycles. So a permanent safety through the smoke detector is possible.
- FIG. 1 the smoke detector (1) according to the invention, consisting of the light emitter (2), the light receiver (3), the electronics (4), the control, as "R” characterized, for the duty cycle and the maintenance cycle contains, and a reflector (5).
- the light transmitter (2) sends a light signal (6) to the reflector (5).
- the light signal is reflected by the reflector (5) as a reflection signal (7) to the light receiver (3).
- the received light signal (7) is evaluated by the electronics (4).
- the described sensor arrangement is accommodated in a housing (8).
- the housing has openings (9), which allow the smoke to enter.
- the electronics (4) are designed so that they can detect even the slightest intensity variations of the signal.
- the sensor system described above can be used not only as a smoke detector.
- the evaluation electronics can be designed such that they can count the occurring disturbances by means of a counter.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Fire-Detection Mechanisms (AREA)
Abstract
Description
Die Erfindung betrifft einen Rauchdetektor, der gegen Störungen von Fremdlicht oder unerwünschten Reflexionen unempfindlich ist.The invention relates to a smoke detector, which is insensitive to interference from extraneous light or unwanted reflections.
Herkömmliche Rauchdetektoren, die mit Lichtsensorik arbeiten, haben vier grundsätzliche Probleme:
- 1. Die Lichtsensorik der Rauchdetektoren kann durch Fremdlicht gestört werden. Das Gehäuse für den Rauchdetektor muss deshalb häufig so gestaltet werden, dass zunächst die Lichtsensorik vor Fremdlicht geschützt wird, statt den Detektor auf den Raucheingang und/oder Rauchdurchgang hin zu optimieren. Besonders bei der Überwachung von großen Räumen, wie zum Beispiel Fabrikhallen, ist es erforderlich, dass der Rauchdetektor mit seiner Lichtsensorik über weite Entfernungen arbeiten kann auch ohne Gehäuse, das ihn vor Fremdlicht schützen soll.
- 2. Herkömmliche Rauchdetektoren arbeiten oft nach einem Prinzip, bei dem die Lichtsensorik Licht aussendet in einem dunklen Gehäuse und Reflexionen von Rauchteilchen erwartet. Bei diesem Prinzip sind Reflexionen des Sensorlichtes innerhalb des Gehäuses unerwünscht, weil die Empfindlichkeit des Detektors herabgesetzt wird. Denn er muss die Reflexionen von Rauchteilchen gegenüber Reflexionen, die von den Gehäusewänden ausgehen, unterscheiden.
- 3. Die Rauchdetektoren werden langfristig durch Verstauben gestört und unbrauchbar.
- 4. Rauchdetektoren altern und bedürfen einer Wartung. Die vorliegende Erfindung schlägt eine automatische Selbstüberwachung und mögliche Selbstreinigung vor.
- 1. The light sensor of the smoke detectors can be disturbed by extraneous light. The housing for the smoke detector must therefore often be designed so that initially the light sensor is protected from extraneous light, instead of optimizing the detector to the smoke inlet and / or smoke passage. Particularly in the monitoring of large rooms, such as factory buildings, it is necessary that the smoke detector with its light sensors can operate over long distances, even without housing, which should protect him from extraneous light.
- 2. Conventional smoke detectors often operate on a principle in which the light sensor emits light in a dark housing and expects reflections from smoke particles. With this principle, reflections of the sensor light within the housing are undesirable because the sensitivity of the detector is lowered. Because he must distinguish the reflections of smoke particles against reflections emanating from the housing walls.
- 3. The smoke detectors are disturbed in the long term by dusting and unusable.
- 4. Smoke detectors age and require maintenance. The present invention proposes automatic self-monitoring and possible Self-cleaning before.
Alle vier aufgeführten Probleme der herkömmlichen Rauchdetektoren können mit dem erfindungsgemäßen Rauchdetektor gelöst werden.All four listed problems of conventional smoke detectors can be solved with the smoke detector according to the invention.
Aus der
Für einen störsicheren Rauchdetektor (1) wird vorgeschlagen, die Sensorik als Reflexlichtschranke auszubilden, so dass ständig von einem Lichtsender (2) ein Lichtsignal (6) auf einen Reflektor (5) ausgesandt wird. Der Reflektor reflektiert das Signal als Reflexion (7) auf einen Lichtempfänger (3). Das Lichtsignal (6) ist mit fester Taktfrequenz intensitätsmoduliert. Das empfangene Signal (7) kann an seiner Taktfrequenz wiedererkannt werden, so dass zur Signalauswertung in der Elektronik (4) Fremdlicht ausgeschlossen wird. Als besonders geeignet wird für die Signalauswertung vorgeschlagen, die in der Deutschen Patentschrift
www.elektroniknet.de/topics/automatisieren/fachthemen/2002/0032/print.htm ., die das so genannte HALIOS Messprinzip anschaulich erläutert. Eine Kopie dieser Veröffentlichung, deren Offenbarungsgehalt in den Offenbarungsgehalt dieser Anmeldung aufgenommen werden soll, ist der Anmeldung beigefügt. Dieses Messverfahren besitzt die notwendige Empfindlichkeit zur Detektion von Reflexionsstörungen.For a fail-safe smoke detector (1), it is proposed to form the sensor system as a reflex light barrier, so that a light signal (6) is constantly emitted by a light transmitter (2) onto a reflector (5). The reflector reflects the signal as a reflection (7) on a light receiver (3). The light signal (6) is intensity-modulated with a fixed clock frequency. The received signal (7) can be recognized at its clock frequency, so that extraneous light is excluded for signal evaluation in the electronics (4). Particularly suitable for the signal evaluation proposed in the German Patent
www.elektroniknet.de/topics/automatisieren/fachthemen/2002/0032/print.htm ., which clearly explains the so-called HALIOS measuring principle. A copy of this publication, the disclosure of which is to be included in the disclosure of this application, is attached to the application. This measuring method has the necessary sensitivity for the detection of reflection disturbances.
Auch andere Messverfahren, die nach dem Reflexionsprinzip arbeiten und die in der Lage sind, Fremdlicht wirkungsvoll aus der Messung auszuschliessen, sind verwendbar, wenn sie die weiteren Anforderungen, die unten dargestellt werden erfüllen.Other measuring methods which work according to the reflection principle and which are able to effectively exclude extraneous light from the measurement, are usable if they meet the other requirements that are presented below.
Weil der erfindungsgemäße Rauchdetektor ständig ein Lichtsignal (6) aussendet und dessen Reflexion (7) auswertet, stören weitere Reflexionen innerhalb des Gehäuses die Messung nicht, denn sie werden als Reflexion des ausgesandten Signals (6) erkannt und als solches in der Messung mit ausgewertet. Dagegen nimmt eindringendes Fremdlicht nicht an der Messung teil.Because the smoke detector according to the invention constantly emits a light signal (6) and evaluates its reflection (7), further reflections interfere within of the housing, the measurement, because they are detected as a reflection of the transmitted signal (6) and evaluated as such in the measurement. By contrast, penetrating extraneous light does not participate in the measurement.
Von Bedeutung ist bei dem erfindungsgemäßen Rauchdetektor die mögliche Ausgestaltungsvielfalt des Reflektors (5). Der Reflektor (5) kann einfach eine unbehandelte Wand oder Teil des Gehäuses sein. Denn der Rauchdetektor kann sich auf den Reflektor einregeln, wie weiter unten in der Beschreibung des "Wartungszyklus" erläutert wird. Der Reflektor kann auch eine Reflexfolie sein aus Mikrokugeln oder Mikrotripeln, besonders aber als Microcube-Reflektor, wie in der
Damit der Rauchdetektor durch langsames Verstauben in Folge von Staubablagerungen nicht seine Funktion verliert oder durch Alterung der Elektronikbauteile Messwerte verändert, die zu Fehlfunktionen führen könnten, schaltet er regelmäßig zwischen einem Arbeitszyklus und einem Wartungszyklus um.So that the smoke detector does not lose its function due to dust accumulation due to dust accumulation or due to aging of the electronic components changes measured values that could lead to malfunctions, it regularly switches between a work cycle and a maintenance cycle.
Besonders gut lässt sich der Arbeitszyklus beschreiben, in dem man das oben genannte HALIOS Prinzip zugrunde legt. Darin wird unter Verwendung einer Kompensations-LED das ausgesandte Signal (6) nachgeregelt, wenn das Reflexionssignals (7) sich verändert hat. Das bedeutet, wird eine Nachregelung im Arbeitszyklus erforderlich, dann ist der Strahlengang gestört worden, zum Beispiel durch Rauch oder Rauchteilchen. Der Rauchdetektor löst Alarm aus. Aber der Arbeitszyklus hat einen Toleranzbereich, in dem er nicht nachregelt, das bedeutet, der Arbeitszyklus ist abhängig von der Störgröße. Nur ab einer bestimmten Störgröße wird Alarm ausgelöst.The work cycle can be described particularly well, based on the HALIOS principle mentioned above. Therein, the emitted signal (6) is readjusted using a compensation LED when the reflection signal (7) has changed. This means that if a readjustment in the work cycle is required, then the beam path has been disturbed, for example by smoke or smoke particles. The smoke detector triggers an alarm. But the duty cycle has a tolerance range in which it does not readjust, that is, the duty cycle depends on the disturbance. Only from a certain disturbance alarm is triggered.
Im Wartungszyklus werden die Alterungen der elektronischen Bauteile und die Veränderungen auf dem Reflektor (5), zum Beispiel durch geringe Staubablagerungen kompensiert. Denn der Arbeitszyklus wird unterbrochen. In dem Wartungszyklus wird der Messelektronik erlaubt, auch unterhalb des Schwellenwertes, der bei Überschreiten einen Alarm auslösen würde, sich nachzuregeln. Das bedeutet, der Rauchdetektor findet durch Nachregeln einen neuen Gleichgewichtszustand. Das Nachregeln im Wartungszustand führt nicht zum Alarm. Außerdem kann vor der Einmessung im Wartungszustand ein Rüttler oder ein Gebläse den abgelagerten Staub aus dem Rauchdetektor entfernen. Bei sehr kleiner Bauweise wird vorgeschlagen, als Gebläse eine Mikropumpe zu verwenden. Diese benötigt wenig Energie, so dass auch batteriebetriebene erfindungsgemäße Rauchdetektoren sich selbst reinigen können während des Wartungszykluses.In the maintenance cycle, the aging of the electronic components and the changes on the reflector (5), for example, are compensated by low dust deposits. Because the work cycle is interrupted. In the maintenance cycle, the measuring electronics are allowed, even below the threshold value, which would trigger an alarm if exceeded, to readjust. This means that the smoke detector finds a new state of equilibrium by readjustment. The readjustment in the maintenance state does not lead to the alarm. In addition, before judging maintenance, a vibrator or blower can remove the deposited dust from the smoke detector. In a very small construction, it is proposed to use a micropump as a blower. This requires little energy, so that even battery-powered smoke detectors according to the invention can clean themselves during the maintenance cycle.
Dieser hier beschriebene Rauchdetektor löst also grundsätzliche Probleme der Detektion von Rauch. Er ist durch Fremdlicht nicht zu stören. Er ist besonders bei der Verwendung des HALIOS Messprinzips während des Arbeitszyklusses sehr empfindlich gegenüber Rauch und Rauchteilchen, weil jede Veränderung des reflektierten Strahles (7) dann zu einem Nachregeln führen würde, wenn die Veränderung ausserhalb des Toleranzbereiches liegen würde. In der Wartungsphase hingegen gibt es keinen Toleranzbereich, sondern es wird zwingend nachgeregelt, um ein neues Gleichgewicht des Messsystems zu finden. Dieses neu eingeregelte Gleichgewicht dient als Startbedingung für den folgenden neuen Arbeitszyklus. Der neuartige Rauchdetektor hat auch kein Problem mehr mit unerwünschten Reflexionen seines Sendesignals (6) innerhalb seines Gehäuses (8). Denn er erkennt diese Reflexionen als von ihm ausgesandt und als Teil seiner Empfangsmessung im Lichtempfänger (3). Der Rauchmelder braucht im Gehäuse keinen Dunkelraum wie bisher, keinen Fremdlichtschutz und keine Maßnahmen zur Unterdrückung von Reflexionen. Der Rauchdetektor kann sich in der Wartungsphase von Staubablagerungen selbst befreien, kann sich langsam voranschreitenden Veränderungen seiner Umgebungssituation und/oder Alterung und Leistungsabnahme von Elektronikbauteilen anpassen durch das Nachregeln während des Wartungszyklusses.This smoke detector described here thus solves fundamental problems of the detection of smoke. He is not disturbed by extraneous light. He is special when using the HALIOS measuring principle during the working cycle, very sensitive to smoke and smoke particles, because any change in the reflected beam (7) would then lead to readjustment if the change were outside the tolerance range. In the maintenance phase, however, there is no tolerance range, but it is mandatory to readjusted to find a new balance of the measuring system. This newly adjusted balance serves as the starting condition for the following new cycle. The novel smoke detector also has no problem with unwanted reflections of its transmission signal (6) within its housing (8). For he recognizes these reflections as emitted by him and as part of his reception measurement in the light receiver (3). The smoke detector does not need a darkroom in the housing as before, no extraneous light protection and no measures to suppress reflections. The smoke detector can free itself of dust deposits in the maintenance phase, can adapt to slowly progressive changes in its environmental situation and / or aging and power consumption of electronic components by readjustment during the maintenance cycle.
Es wird vorgeschlagen, dass der Rauchdetektor seinen Arbeitszyklus und/oder Wartungszyklus durch zum Beispiel eine LED anzeigt. Besonders geeignet ist es, dass der Rauchdetektor nach einer vorgegebenen Zahl von Wartungszyklen ein Signal gibt zur händischen Wartung durch einen Wartungsfachmann. So ist eine dauerhafte Sicherheit durch den Rauchdetektor möglich.It is suggested that the smoke detector indicate its duty cycle and / or maintenance cycle by, for example, an LED. It is particularly suitable that the smoke detector gives a signal for manual maintenance by a maintenance expert after a predetermined number of maintenance cycles. So a permanent safety through the smoke detector is possible.
Es zeigt die
Das Lichtsignal wird von dem Reflektor (5) als Reflexionssignal (7) zum Lichtempfänger (3) reflektiert. Das empfangene Lichtsignal (7) wird von der Elektronik (4) ausgewertet. Die beschriebene Sensoranordnung ist in einem Gehäuse (8) untergebracht. Das Gehäuse besitzt Öffnungen (9), die den Raucheintritt ermöglichen.The light signal is reflected by the reflector (5) as a reflection signal (7) to the light receiver (3). The received light signal (7) is evaluated by the electronics (4). The described sensor arrangement is accommodated in a housing (8). The housing has openings (9), which allow the smoke to enter.
Tritt Rauch durch die Öffnungen (9) in das Gehäuse (8), so wird der Strahlengang (6) und/oder (7) gestört. Diese Störung wird von dem Lichtempfänger (3) als Intensitätsveränderung des eintreffenden Signals (7) gemessen. Die Elektronik (4) ist so beschaffen, dass sie auch geringste Intensitätsver-änderungen des Signals detektieren kann.If smoke passes through the openings (9) in the housing (8), the beam path (6) and / or (7) is disturbed. This interference is measured by the light receiver (3) as a change in intensity of the incoming signal (7). The electronics (4) are designed so that they can detect even the slightest intensity variations of the signal.
Es versteht sich von selbst, dass das oben beschriebene Sensorsystem nicht nur als Rauchdetektor einsetzbar ist. Es sind vielfältige Anwendungsmöglichkeiten denkbar, so z. B. als Lichtschranke für die Detektion von bewegten Gegenständen wie beispielsweise in Produktions- oder Transportprozessen. Die Auswerteelektronik kann so beschaffen sein, dass sie mittels eines Zählers die auftretenden Störungen zählen kann.It goes without saying that the sensor system described above can be used not only as a smoke detector. There are many possible applications conceivable, such. B. as a light barrier for the detection of moving objects such as in production or transport processes. The evaluation electronics can be designed such that they can count the occurring disturbances by means of a counter.
Claims (4)
- Method for detecting smoke, in which an intensity-modulated light signal (6) with a constant pulse frequency is transmitted by a light transmitter (2) to a reflector (5) located at a distance from the light transmitter (2), in which a reflection signal (7) is reflected by the reflector (5) to a light receiver (3) located at a distance from the reflector (5), in which by means of an evaluation unit (4) the reflection signal (7) is recognised on the basis of its pulse frequency and a change in the intensity of the reflection signal (7) compared to the intensity of the light signal (6) is measured, and in which the light signal (6) is readjusted if the intensity of the reflection signal (7) deviates from its intensity by at least a specific disturbance variable.
- Method according to Claim 1, characterised in that an alarm is triggered if the intensity of the reflection signal (7) has changed by at least the specific disturbance variable compared to the intensity of the light signal (6).
- Method according to any one of the preceding claims, characterised in that in a maintenance cycle the intensity of the light signal (6) depending on the intensity of the reflection signal (7) is readjusted without the alarm being triggered.
- Method according to Claim 3, characterised in that during the maintenance cycle dust deposited on the reflector (5) and/or light receiver (3) and/or light transmitter (2) is removed by means of a blower or a vibrator.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102005050451A DE102005050451A1 (en) | 2005-10-19 | 2005-10-19 | smoke detector |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1777670A2 EP1777670A2 (en) | 2007-04-25 |
EP1777670A3 EP1777670A3 (en) | 2007-07-25 |
EP1777670B1 true EP1777670B1 (en) | 2009-01-21 |
Family
ID=37680613
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06020998A Not-in-force EP1777670B1 (en) | 2005-10-19 | 2006-10-06 | Smoke detector |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1777670B1 (en) |
AT (1) | ATE421742T1 (en) |
DE (2) | DE102005050451A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP4270344A1 (en) * | 2022-04-26 | 2023-11-01 | Honeywell International Inc. | Self-testing fire sensing device for confirming a fire |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3889579A1 (en) * | 2020-03-30 | 2021-10-06 | Carrier Corporation | Cleaning system for a smoke detector |
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US3885162A (en) * | 1973-10-31 | 1975-05-20 | Contraves Goerz Corp | Optical measuring apparatus |
DE4320873A1 (en) * | 1993-06-23 | 1995-01-05 | Hekatron Gmbh | Circuit arrangement for an optical detector for environmental monitoring and display of an interference medium |
JPH07239958A (en) * | 1994-02-28 | 1995-09-12 | Ito Seisakusho:Kk | Passenger confirming device |
DE4432114C1 (en) * | 1994-09-09 | 1995-06-08 | Hella Kg Hueck & Co | Stray light suppression circuit for light barrier arrangement |
JP4373535B2 (en) * | 1999-07-22 | 2009-11-25 | 住友電設株式会社 | Air blow type fire alarm system |
WO2004019294A2 (en) * | 2002-08-23 | 2004-03-04 | General Electric Company | Rapidly responding, false detection immune alarm signal producing smoke detector |
DE10346741B3 (en) * | 2003-10-08 | 2005-03-24 | Mechaless Systems Gmbh | Determining and/or evaluating differential optical signal involves regulating intensity radiated into measurement arrangement with control parameter generated from incoming light intensity at receiver measured relative to phase position |
-
2005
- 2005-10-19 DE DE102005050451A patent/DE102005050451A1/en not_active Withdrawn
-
2006
- 2006-10-06 DE DE502006002695T patent/DE502006002695D1/en active Active
- 2006-10-06 EP EP06020998A patent/EP1777670B1/en not_active Not-in-force
- 2006-10-06 AT AT06020998T patent/ATE421742T1/en not_active IP Right Cessation
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP4270344A1 (en) * | 2022-04-26 | 2023-11-01 | Honeywell International Inc. | Self-testing fire sensing device for confirming a fire |
US11900791B2 (en) | 2022-04-26 | 2024-02-13 | Honeywell International Inc. | Self-testing fire sensing device for confirming a fire |
Also Published As
Publication number | Publication date |
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EP1777670A2 (en) | 2007-04-25 |
ATE421742T1 (en) | 2009-02-15 |
DE102005050451A1 (en) | 2007-05-03 |
EP1777670A3 (en) | 2007-07-25 |
DE502006002695D1 (en) | 2009-03-12 |
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