

Die vorliegende Erfindung betrifft einen Streulicht-Rauchmelder mit einer opto-elektronischen Anordnung zur Messung von Streusignalen unter einem Vorwärts- und einem Rückwärtsstreuwinkel, und mit einer Auswerteelektronik für die Gewinnung eines Messwerts aus den Streusignalen und den Vergleich eines von diesem abgeleiteten Alarmwerts mit einer Alarmschwelle.The present invention relates to a scattered light smoke detector with an opto-electronic device for measuring stray signals at a forward and a backward scattering angle, and with evaluation electronics for obtaining a measured value from the stray signals and the comparison of an alarm value derived therefrom with an alarm threshold.
Die
Die
Die
Es ist schon lange bekannt, dass das bei Vorwärts- und Rückwärtsstreuung die beiden Streulichtanteile für verschiedene Arten von Bränden in charakteristischer Weise verschieden sind. Dieses Phänomen ist beispielsweise in der
Durch die Erfindung soll nun die Fehlalarmsicherheit der Streulicht-Rauchmelder der eingangs genannten Art erhöht werden, wobei gleichzeitig ein möglichst rasches Ansprechen gewährleistet sein soll.
Diese Aufgabe wird erfindungsgemäss durch einen Streulicht-Rauchmelder nach Anspruch 1 und ein Verfahren nach Anspruch 19 gelöst.It has long been known that in forward and backward scattering, the two stray light components are characteristically different for different types of fires. This phenomenon is for example in the
 With the invention, the false alarm safety of the scattered light smoke detector of the type mentioned is now to be increased, at the same time the fastest possible response should be ensured.
 This object is achieved by a scattered light smoke detector according to claim 1 and a method according to
Die Verwendung der Differenz der Streusignale oder Rauchsignale für die Bildung des Messwerts anstatt einer Gewichtung des Messwerts in Abhängigkeit vom Verhältnis der Streusignale hat den Vorteil, dass wesentlich weniger Rechneraufwand benötigt wird und somit eine kurze Ansprechzeit des Melders gewährleistet ist. Die Differenz der Streusignale ermöglicht ebenso wie deren Quotient die Erkennung der Rauchart.The use of the difference of the stray signals or smoke signals for the formation of the measured value instead of a weighting of the measured value as a function of the ratio of the stray signals has the advantage that much less computer effort is needed and thus a short response time of the detector is ensured. The difference of the scattered signals as well as their quotient allows the recognition of the type of smoke.
Eine erste bevorzugte Ausführungsform des erfindungsgemässen Streulicht-Rauchmelders ist dadurch gekennzeichnet, dass die genannte lineare Verknüpfung nach der Formel [k1(BW+FW) + k2(BW-FW)] erfolgt, in welcher k1 und k2 zwei unter anderem von einem von den Umgebungsbedingungen am vorgesehenen Installationsort des Melder abhängigen Applikationsfaktor beeinflusste Konstanten sind. Für die genannten Konstanten gilt 0 < k1. k2 < 5, vorzugsweise 0< k1. k2 ≤ 3.A first preferred embodiment of the scattered-light smoke detector according to the invention is characterized in that said linear combination takes place according to the formula [k1 (BW + FW) + k2 (BW-FW)], in which k1 and k2 are two among others are constants influenced by an application factor dependent on the environmental conditions at the intended installation location of the detector. For the stated constants, 0 <k1 . k2 <5, preferably 0 <k1 . k2 ≤ 3.
Der Applikationsfaktor ist anwendungsspezifisch wählbar, und zwar vorzugsweise in Abhängigkeit von einem den Anforderungen des Kunden entsprechenden Satz von Einstellparametern des Melders.
Eine Zweite bevorzugte Ausführungsform des erfindungsgemässen Streulicht-Rauchmelders ist dadurch gekennzeichnet, dass eine Verarbeitung des Messwerts in zwei Pfaden erfolgt, dass im ersten Pfad eine Bestimmung des Typs des betreffenden Feuers erfolgt und ein entsprechendes Steuersignal gebildet wird und im zweiten Pfad eine Verarbeitung des genannten Messwerts und dessen Vergleich mit einer Alarmschwelle erfolgt, und dass die Verarbeitung des Messwerts im zweiten Pfad durch das im ersten Pfad gebildete Steuersignal gesteuert ist.
Eine dritte bevorzugte Ausführungsform des erfindungsgemässen Streulicht-Rauchmelders ist dadurch gekennzeichnet, dass bei der Bestimmung des Typs des betreffenden Feuers eine Unterscheidung nach Schwelbrand und offenem Brand und gegebenenfalls weiteren Brandarten erfolgt.
Eine vierte bevorzugte Ausführungsform ist dadurch gekennzeichnet, dass die Verarbeitung des Messwerts im zweiten Pfad eine Begrenzung des Messwerts in einer nachfolgend als Slope Regler bezeichneten Stufe umfasst, wobei eine Beschränkung des Messwerts auf ein bestimmtes Niveau oder dessen Verstärkung durch Addition eines Zusatzsignals erfolgt.
Eine weitere bevorzugte Ausführungsform des erfindungsgemässen Streulicht-Rauchmelders ist dadurch gekennzeichnet, dass der Slope Regler sowohl einen raschen Anstieg des Messwerts aufgrund von Signalspitzen verhindert als auch langsame Signalanstiege bei Schwelbränden akzentuiert. Vorzugsweise ist der Slope Regler durch das im ersten Pfad gebildete Steuersignal gesteuert. Im Slope Regler wird durch eine sehr langsame Filterung des Messwerts ein langsames Rauchsignal gewonnen.
Weitere bevorzugte Weiterentwicklungen und Verbesserungen des erfindungsgemässen Streulicht-Rauchmelders sind in den Ansprüchen 12 bis 18 beansprucht.
Im Folgenden wird die Erfindung anhand eines Ausführungsbeispiels und der Zeichnungen näher erläutert; es zeigt:
| Application Number | Priority Date | Filing Date | Title | 
|---|---|---|---|
| EP04023740AEP1630758B1 (en) | 2004-08-31 | 2004-10-06 | Scattered light smoke detector | 
| BRPI0516553-9ABRPI0516553A (en) | 2004-10-06 | 2005-10-06 | stray light smoke detector | 
| MX2007004102AMX2007004102A (en) | 2004-10-06 | 2005-10-06 | Scattered light smoke detector. | 
| CA002583731ACA2583731A1 (en) | 2004-10-06 | 2005-10-06 | Scattered light smoke detector | 
| AU2005291248AAU2005291248A1 (en) | 2004-10-06 | 2005-10-06 | Scattered light smoke detector | 
| CNA2005800340892ACN101036173A (en) | 2004-10-06 | 2005-10-06 | Scattered light smoke detector | 
| US11/664,874US7777634B2 (en) | 2004-10-06 | 2005-10-06 | Scattered light smoke detector | 
| KR1020077009287AKR20070058647A (en) | 2004-10-06 | 2005-10-06 | Scattered Light Smoke Detector | 
| PCT/EP2005/055076WO2006037804A1 (en) | 2004-10-06 | 2005-10-06 | Scattered light smoke detector | 
| RU2007116951/09ARU2007116951A (en) | 2004-10-06 | 2005-10-06 | SMOKE SIGNALS USING DIFFERENT LIGHT | 
| Application Number | Priority Date | Filing Date | Title | 
|---|---|---|---|
| EP04020577AEP1630759B1 (en) | 2004-08-31 | 2004-08-31 | Scattered-light smoke detector | 
| EP04023740AEP1630758B1 (en) | 2004-08-31 | 2004-10-06 | Scattered light smoke detector | 
| Publication Number | Publication Date | 
|---|---|
| EP1630758A2 EP1630758A2 (en) | 2006-03-01 | 
| EP1630758A3 EP1630758A3 (en) | 2006-03-08 | 
| EP1630758B1true EP1630758B1 (en) | 2008-01-02 | 
| Application Number | Title | Priority Date | Filing Date | 
|---|---|---|---|
| EP04023740AExpired - LifetimeEP1630758B1 (en) | 2004-08-31 | 2004-10-06 | Scattered light smoke detector | 
| Country | Link | 
|---|---|
| US (1) | US7777634B2 (en) | 
| EP (1) | EP1630758B1 (en) | 
| KR (1) | KR20070058647A (en) | 
| CN (1) | CN101036173A (en) | 
| AU (1) | AU2005291248A1 (en) | 
| BR (1) | BRPI0516553A (en) | 
| CA (1) | CA2583731A1 (en) | 
| MX (1) | MX2007004102A (en) | 
| RU (1) | RU2007116951A (en) | 
| WO (1) | WO2006037804A1 (en) | 
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