EP0142672B1 - Optical smoke detector - Google Patents

Optical smoke detector Download PDF

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Publication number
EP0142672B1
EP0142672B1 EP84111255A EP84111255A EP0142672B1 EP 0142672 B1 EP0142672 B1 EP 0142672B1 EP 84111255 A EP84111255 A EP 84111255A EP 84111255 A EP84111255 A EP 84111255A EP 0142672 B1 EP0142672 B1 EP 0142672B1
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EP
European Patent Office
Prior art keywords
light
detector
lobe
light source
optical smoke
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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.)
Expired
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EP84111255A
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German (de)
French (fr)
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EP0142672A1 (en
Inventor
Peer Dr.-Ing. Thilo
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Siemens AG
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Siemens AG
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Priority to AT84111255T priority Critical patent/ATE28008T1/en
Publication of EP0142672A1 publication Critical patent/EP0142672A1/en
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Publication of EP0142672B1 publication Critical patent/EP0142672B1/en
Expired legal-status Critical Current

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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
    • G08B17/103—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
    • G08B17/107—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 for detecting light-scattering due to smoke
    • 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 an optical smoke detector with a light transmitter and a light receiver arranged at an acute angle thereto, the overlapping zones of the transmitting and receiving lobes forming a measuring space in which existing smoke particles cause light scattering, which is received as reverse radiation, the receiver in at least one light transmitter is assigned in the immediate vicinity.
  • EP-A 1-031 096 describes an optical arrangement for a smoke detector based on the light scattering principle. It is proposed there to arrange the transmitter and receiver at an acute angle to one another in order to achieve a short overall length, so that the largest possible overlap zone of the transmitting and receiving lobes is formed in order to be able to make good use of the backward scattering. In addition to the optical systems, this requires a rather complicated labyrinth consisting of a large number of diaphragms. To avoid reflections in the interior of the detector and to form an optical sump, these diaphragms must be arranged in a very specific way with respect to the respective axes of the transmitting and receiving lobes.
  • the object of the invention is to avoid the disadvantage of the complicated and large labyrinth and to create an optical smoke detector of the type described at the outset, which allows a simple structure without a lot of glare, the scattered light from the backward radiation being optimally used.
  • this object is achieved according to the invention in that an unscattered light beam emanating from the light transmitter exits through an opening made in the housing of the detector, the angle of the transmitting lobe being at least so small that it corresponds to the outlet opening, and wherein Housing at the point up to which the receiving lobe extends has no opening.
  • a smoke detector constructed in this manner has the advantage that no labyrinth with a plurality of Blen - the light is required to form a sump.
  • the light outlet opening of the detector can also serve as a smoke inlet opening, so that the smoke can enter immediately and reach the measuring room if the arrangement is appropriately favorable. There is therefore no delay for the entry of smoke, as is very often the case with existing complicated labyrinths. This enables the detector to react more quickly.
  • the receiving lobe of the receiver is oriented in such a way that no extraneous light entering the detector interferes with the light receiver.
  • a smoke detector which uses the backward scattering, the transmitting and receiving lobes protruding from the housing.
  • the detection room is also outside the housing, which requires a high transmission power.
  • a plurality of light transmitters are arranged concentrically around a light receiver.
  • This has the advantage that the measuring room becomes much larger.
  • Another advantage is that by illuminating the measuring room with several transmitters, the scattered light intensity of the reverse radiation is significantly increased.
  • this structure permits a very dense arrangement of the light transmitters around the light receiver, so that the optical axes of the light transmitters are thereby arranged at a very acute angle to the optical axis of the light receiver. This creates a very large-volume measuring room.
  • a plurality of light receivers can be arranged concentrically around a light transmitter. This also has the advantage that, due to the plurality of light receivers, the relatively weak scattered light can be received better. The light reflected by smoke particles is received by several receivers and from several sides, the received signals add up, so that the signal intensity is increased.
  • the optical smoke detector it is expedient to limit the receiving lobe or lobes of the receiver or the receiver from almost parallel lines.
  • the housing wall opposite the receiver has no opening.
  • it is not necessary there to form a light sump with the aid of diaphragms because the light emitted by the transmitter or by the transmitters comes out tightly bundled and cannot cause a disturbing reflection inside the housing, which could hit the receiver if smoke is not present .
  • the arrangement of transmitter and receiver according to the invention it is possible to achieve an angle of the optical axes which can be substantially smaller than 45 °.
  • the large-volume measuring room achieved in this way particularly when several light transmitters are arranged, ensures a very high scattered light intensity compared to conventional smoke detectors with backward scattering.
  • the transmitters and the receiver (s) are arranged in such a way that the transmitting or receiving lobes are aligned approximately perpendicular to the detector base.
  • the transmission beam enters the room downwards.
  • the light exit openings, the expedient In some cases the smoke inlets can be the same on the front of the detector so that smoke can penetrate directly into the interior of the detector housing.
  • the smoke detector shown schematically has a base SOK with base contacts K, a subrack BGT on which, among other things. a receiver E and two light transmitters S1 and S2 are arranged accordingly close to the lens L of the receiver E.
  • the detector M has a housing G which has an opening ⁇ and ⁇ 2 opposite each of the light transmitters S1 and S2.
  • the transmission lobes SK1 and SK2 have a relatively narrow beam angle a.
  • the size of the light exit openings ⁇ 1 and ⁇ 2 is designed in accordance with this angle a, so that the transmitted beam cannot be reflected inside the housing.
  • This arrangement allows a very acute angle ⁇ between the optical axis OAE of the receiver E and the optical axes OA1 and OA2 of the transmitters S1 and S2. As a result, large overlap zones are formed, which result in a large-volume measurement area MR. As long as no smoke gets into the interior of the detector and thus into the measuring room, the light emitted by the light transmitters is not reflected, it can escape unhindered. If smoke occurs, the light is scattered in the measuring room and received with the receiver on the back.
  • This arrangement represents only a simple exemplary embodiment.
  • several transmitters can be arranged concentrically around a receiver in order to increase the efficiency of the optical smoke detector.
  • a reverse arrangement is also possible, namely to arrange several receivers around a transmitter, the light beam of the transmitter exiting through a correspondingly arranged opening in the detector housing without causing reflections in the interior of the detector.

Abstract

1. An optical smoke sensor comprising a light source (S) and a light detector (E) arranged at an acute angle (beta) in relation thereto, where the overlap zones of the transmitting lobe (SK) and the receiving lobe (EK) form a measurement zone (MR) in which smoke particles present produce a scattering of light to be received as reflected radiation, wherein the detector (E) is assigned at least one light source (S1, S2) in its direct vicinity, characterised in that a non-scattered light beam (SK1, SK2) which emanates from the light source emerges through an opening (O1, O2) in the housing (G) of the sensor (M), where the angle (alpha) of the transmitting lobe (SK) is at least sufficiently small to correspond to the outlet opening (O), and where the housing has no opening at the point to which the receiving lobe (EK) extends.

Description

Die Erfindung bezieht sich auf einen optischen Rauchmelder mit einem Lichtsender und einem im spitzen Winkel dazu angeordneten Lichtempfänger, wobei die Überlappungszonen von Sende- und Empfangskeule einen Messraum bilden, in dem vorhandene Rauchpartikel eine Lichtstreuung verursachen, die als Rückwärtsstrahlung empfangen wird, wobei dem Empfänger in unmittelbarer Nähe mindestens ein Lichtsender zugeordnet ist.The invention relates to an optical smoke detector with a light transmitter and a light receiver arranged at an acute angle thereto, the overlapping zones of the transmitting and receiving lobes forming a measuring space in which existing smoke particles cause light scattering, which is received as reverse radiation, the receiver in at least one light transmitter is assigned in the immediate vicinity.

Die meisten optischen Rauchmelder, die nach dem Lichtstreuungsprinzip arbeiten, nützen die Vorwärtsstreuung aus. Hier verursachen grosse Rauchaerosole einen starken Effekt, während kleine Aerosole nur wenig Streulicht verursachen. Rauchmelder, die die Rückwärtsstreuung ausnutzen, haben eine gleichmässigere Empfindlichkeit, was einen universellen Einsatz ermöglicht. Die schwächere Streulichtintensität erfordert jedoch einen höheren elektronischen Aufwand. Insbesondere ist bei Streulichtmeldern nach dem Prinzip der Rückwärtsstreuung der optische Aufbau recht kompliziert und aufwendig, da sonst Licht vom Sender in den Empfänger über das Meldergehäuse reflektiert wird, auch wenn kein Rauch vorhanden ist.Most optical smoke detectors, which work according to the light scattering principle, use forward scattering. Large smoke aerosols have a strong effect here, while small aerosols cause little scattered light. Smoke detectors that use the backward scattering have a more uniform sensitivity, which enables universal use. The weaker scattered light intensity, however, requires more electronic effort. In particular, in the case of scattered light detectors based on the principle of backward scattering, the optical structure is quite complicated and expensive, since otherwise light is reflected from the transmitter into the receiver via the detector housing, even if there is no smoke.

In der EP-A 1-031 096 ist eine optische Anordnung für einen Rauchmelder nach dem Lichtstreuungsprinzip beschrieben. Es wird dort vorgeschlagen, zur Erzielung einer geringen Baulänge Sender und Empfänger in einem spitzen Winkel zueinander anzuordnen, so dass eine möglichst grossvolumige Überlappungszone von Sende- und Empfangskeule gebildet wird, um die Rückwärtsstreuung günstig ausnutzen zu können. Dazu ist aber neben den optischen Systemen ein recht kompliziertes Labyrinth notwendig, das aus einer Vielzahl von Blenden besteht. Zur Vermeidung von Reflexionen im Melderinneren und zur Bildung eines optischen Sumpfes müssen diese Blenden in ganz bestimmter Weise zu den jeweiligen Achsen der Sende- und Empfangskeule angeordnet werden.EP-A 1-031 096 describes an optical arrangement for a smoke detector based on the light scattering principle. It is proposed there to arrange the transmitter and receiver at an acute angle to one another in order to achieve a short overall length, so that the largest possible overlap zone of the transmitting and receiving lobes is formed in order to be able to make good use of the backward scattering. In addition to the optical systems, this requires a rather complicated labyrinth consisting of a large number of diaphragms. To avoid reflections in the interior of the detector and to form an optical sump, these diaphragms must be arranged in a very specific way with respect to the respective axes of the transmitting and receiving lobes.

Aufgabe der Erfindung ist es, den Nachteil des komplizierten und grossen Labyrinths zu vermeiden und einen optischen Rauchmelder der eingangs beschriebenen Art zu schaffen, der einen einfachen Aufbau ohne viel Blenden erlaubt, wobei das Streulicht der Rückwärtsstrahlung optimal genutzt werden kann.The object of the invention is to avoid the disadvantage of the complicated and large labyrinth and to create an optical smoke detector of the type described at the outset, which allows a simple structure without a lot of glare, the scattered light from the backward radiation being optimally used.

Diese Aufgabe wird bei einem eingangs beschriebenen optischen Rauchmelder erfindungsgemäss dadurch gelöst, dass ein vom Lichtsender ausgehender nicht gestreuter Lichtstrahl durch eine im Gehäuse des Melders angebrachte Öffnung austritt, wobei der Winkel der Sendekeule zumindest so klein ist, dass er der Austrittsöffnung entspricht, und wobei das Gehäuse an jener Stelle, bis zu der die Empfangskeule reicht, keine Öffnung aufweist.In the case of an optical smoke detector described at the outset, this object is achieved according to the invention in that an unscattered light beam emanating from the light transmitter exits through an opening made in the housing of the detector, the angle of the transmitting lobe being at least so small that it corresponds to the outlet opening, and wherein Housing at the point up to which the receiving lobe extends has no opening.

Ein derartig aufgebauter Rauchmelder hat den Vorteil, dass kein Labyrinth mit einer Vielzahl von Blen- den zur Bildung eines Lichtsumpfes erforderlich ist. Die Lichtaustrittsöffnung des Melders kann gleichzeitig als Raucheintrittsöffnung dienen, so dass bei entsprechend günstiger Anordnung der Rauch unmittelbar eintreten und zum Messraum gelangen kann. Es tritt also für den Raucheintritt keine Verzögerung ein, wie dies sehr häufig bei vorhandenen komplizierten Labyrinths der Fall ist. Dadurch kann der Melder schneller reagieren. Bei der erfindungsgemässen Anordnung ist die Empfangskeule des Empfängers so ausgerichtet, dass kein in das Melderinnere eindringende Fremdlicht den Lichtempfänger stört.A smoke detector constructed in this manner has the advantage that no labyrinth with a plurality of Blen - the light is required to form a sump. The light outlet opening of the detector can also serve as a smoke inlet opening, so that the smoke can enter immediately and reach the measuring room if the arrangement is appropriately favorable. There is therefore no delay for the entry of smoke, as is very often the case with existing complicated labyrinths. This enables the detector to react more quickly. In the arrangement according to the invention, the receiving lobe of the receiver is oriented in such a way that no extraneous light entering the detector interferes with the light receiver.

Aus der DE-A-2 632 876 ist ein Rauchmelder bekannt, der die Rückwärtsstreuung ausnützt, wobei Sende- und Empfangskeule aus dem Gehäuse hinausragen. Der Detektionsraum ist aber ebenfalls ausserhalb des Gehäuses, was eine hohe Sendeleistung erforderlich macht.From DE-A-2 632 876 a smoke detector is known which uses the backward scattering, the transmitting and receiving lobes protruding from the housing. However, the detection room is also outside the housing, which requires a high transmission power.

In einer zweckmässigen Weiterbildung der Erfindung sind mehrere Lichtsender konzentrisch um einen Lichtempfänger angeordnet. Dies hat den Vorteil, dass der Messraum wesentlich grösser wird. Ein weiterer Vorteil besteht darin, dass durch das Ausleuchten des Messraums mit mehreren Sendern die Streulichtintensität der Rückwärtsstrahlung wesentlich erhöht wird. Ferner erlaubt dieser Aufbau eine sehr dichte Anordnung der Lichtsender um den Lichtempfänger, so dass dadurch die optischen Achsen der Lichtsender in einem sehr spitzen Winkel zur optischen Achse des Lichtempfängers angeordnet sind. Dadurch wird ein sehr grossvolumiger Messraum gebildet.In an expedient development of the invention, a plurality of light transmitters are arranged concentrically around a light receiver. This has the advantage that the measuring room becomes much larger. Another advantage is that by illuminating the measuring room with several transmitters, the scattered light intensity of the reverse radiation is significantly increased. Furthermore, this structure permits a very dense arrangement of the light transmitters around the light receiver, so that the optical axes of the light transmitters are thereby arranged at a very acute angle to the optical axis of the light receiver. This creates a very large-volume measuring room.

In einer weiteren Ausgestaltung der Erfindung können mehrere Lichtempfänger konzentrisch um einen Lichtsender angeordnet werden. Dabei ergibt sich ebenfalls der Vorteil, dass aufgrund der Mehrzahl von Lichtempfängern das relativ schwache Streulicht besser empfangen werden kann. Das von Rauchpartikeln reflektierte Licht wird mit mehreren Empfängern und von mehreren Seiten empfangen, die Empfangssignale addieren sich, so dass dadurch die Signalintensität vergrössert wird.In a further embodiment of the invention, a plurality of light receivers can be arranged concentrically around a light transmitter. This also has the advantage that, due to the plurality of light receivers, the relatively weak scattered light can be received better. The light reflected by smoke particles is received by several receivers and from several sides, the received signals add up, so that the signal intensity is increased.

Bei dem erfindungsgemässen optischen Rauchmelder ist es zweckmässig die Empfangskeule bzw. -keulen des Empfängers bzw. der Empfänger von nahezu parallelen Linien zu begrenzen. Die dem Empfänger gegenüberliegende Gehäusewand weist keine Öffnung auf. Es ist dort jedoch nicht erforderlich, mit Hilfe von Blenden einen Lichtsumpf auszubilden, weil das vom Sender bzw. von den Sendern abgestrahlte Licht eng gebündelt nach aussen tritt und im Gehäuseinneren keine störende Reflexion verursachen kann, die bei nicht vorhandenen Rauch auf dem Empfänger treffen könnte. Mit der erfindungsgemässen Anordnung von Sender und Empfänger ist es möglich, einen Winkel der optischen Achsen zu erzielen, der wesentlich kleiner als 45° sein kann. Der damit erreichte grossvolumige Messraum, insbesondere bei Anordnung von mehreren Lichtsendern, gewährleistet eine sehr hohe Streulichtintensität gegenüber herkömmlichen Rauchmeldern mit Rückwärtsstreuung.In the optical smoke detector according to the invention, it is expedient to limit the receiving lobe or lobes of the receiver or the receiver from almost parallel lines. The housing wall opposite the receiver has no opening. However, it is not necessary there to form a light sump with the aid of diaphragms, because the light emitted by the transmitter or by the transmitters comes out tightly bundled and cannot cause a disturbing reflection inside the housing, which could hit the receiver if smoke is not present . With the arrangement of transmitter and receiver according to the invention, it is possible to achieve an angle of the optical axes which can be substantially smaller than 45 °. The large-volume measuring room achieved in this way, particularly when several light transmitters are arranged, ensures a very high scattered light intensity compared to conventional smoke detectors with backward scattering.

Bei dem erfindungsgemässen Rauchmelder ist es vorteilhaft, die Sender und den bzw. die Empfänger so anzuordnen, dass die Sende- bzw. Empfangskeulen in etwa senkrecht zum Meldersockel ausgerichtet sind. Bei einem an einer Raumdecke montierten Rauchmelder tritt der Sendestrahl nach unten in den Raum. Die Lichtaustrittsöffnungen, die zweckmässigerweise gleich die Raucheintrittsöffnungen sein können, sind dann an der Melderfrontseite, so dass ein entstehender Rauch unmittelbar in das Innere des Meldergehäuses eindringen kann.In the smoke detector according to the invention, it is advantageous to arrange the transmitters and the receiver (s) in such a way that the transmitting or receiving lobes are aligned approximately perpendicular to the detector base. With a smoke detector mounted on a ceiling, the transmission beam enters the room downwards. The light exit openings, the expedient In some cases the smoke inlets can be the same on the front of the detector so that smoke can penetrate directly into the interior of the detector housing.

Anhand eines Ausführungsbeispiels und der Zeichnung wird der erfindungsgemässe Rauchmelder im folgenden erläutert. Dabei zeigt die

  • Fig. 1 eine Prinzipdarstellung des Rauchmelders und
  • Fig. 2 entsprechend dazu die Draufsicht.
The smoke detector according to the invention is explained below using an exemplary embodiment and the drawing. The shows
  • Fig. 1 is a schematic diagram of the smoke detector and
  • Fig. 2 corresponding to the top view.

Der schematisch dargestellte Rauchmelder besitzt einen Sockel SOK mit Sockelkontakten K, einen Baugruppenträger BGT auf dem u.a. ein Empfänger E und entsprechend dicht bei der Linse L des Empfängers E zwei Lichtsender S1 und S2 angeordnet sind. Der Melder M weist ein Gehäuse G auf, das gegenüber von den Lichtsendern S1 und S2 jeweils eine Öffnung Ö und Ö2 besitzt. Mit Hilfe der Linse wird die Empfangskeule EK des Lichtempfängers E parallel gerichtet, so dass eintretendes Fremdlicht nicht in den Lichtempfänger gelangen kann. Die Sendekeulen SK1 und SK2 besitzen einen verhältnismässig schmalen Bündelungswinkel a. Entsprechend diesem Winkel a ist die Grösse der Lichtaustrittsöffnungen Ö1 und Ö2 ausgebildet, so dass der Sendestrahl im Gehäuseinneren nicht reflektiert werden kann. Diese Anordnung erlaubt einen sehr spitzen Winkel ß zwischen der optischen Achse OAE des Empfängers E und den optischen Achsen OA1 und OA2 der Sender S1 und S2. Dadurch werden grosse Überlappungszonen gebildet, die einen grossvolumigen Messraum MR ergeben. Solange kein Rauch in das Melderinnere und damit in den Messraum gelangt, wird das von den Lichtsendern abgestrahlte Licht nicht reflektiert, es kann ungehindert austreten. Tritt Rauch ein, so wird in dem Messraum das Licht gestreut und mit dem rückseitig angeordneten Empfänger empfangen. Diese Anordnung stellt lediglich ein einfaches Ausführungsbeispiel dar. Wie oben schon erwähnt können um einen Empfänger mehrere Sender konzentrisch angeordnet werden um den Wirkungsgrad des optischen Rauchmelders zu erhöhen. Es ist ebenso eine umgekehrte Anordnung möglich, nämlich um einen Sender mehrere Empfänger herum anzuordnen, wobei der Lichtstrahl des Senders durch eine entsprechend angeordnete Öffnung im Meldergehäuse nach aussen tritt ohne Reflexionen im Melderinneren zu verursachen.The smoke detector shown schematically has a base SOK with base contacts K, a subrack BGT on which, among other things. a receiver E and two light transmitters S1 and S2 are arranged accordingly close to the lens L of the receiver E. The detector M has a housing G which has an opening Ö and Ö2 opposite each of the light transmitters S1 and S2. With the help of the lens, the receiving lobe EK of the light receiver E is directed in parallel, so that incoming extraneous light cannot get into the light receiver. The transmission lobes SK1 and SK2 have a relatively narrow beam angle a. The size of the light exit openings Ö1 and Ö2 is designed in accordance with this angle a, so that the transmitted beam cannot be reflected inside the housing. This arrangement allows a very acute angle β between the optical axis OAE of the receiver E and the optical axes OA1 and OA2 of the transmitters S1 and S2. As a result, large overlap zones are formed, which result in a large-volume measurement area MR. As long as no smoke gets into the interior of the detector and thus into the measuring room, the light emitted by the light transmitters is not reflected, it can escape unhindered. If smoke occurs, the light is scattered in the measuring room and received with the receiver on the back. This arrangement represents only a simple exemplary embodiment. As already mentioned above, several transmitters can be arranged concentrically around a receiver in order to increase the efficiency of the optical smoke detector. A reverse arrangement is also possible, namely to arrange several receivers around a transmitter, the light beam of the transmitter exiting through a correspondingly arranged opening in the detector housing without causing reflections in the interior of the detector.

Claims (6)

1. An optical smoke sensor comprising a light source (S) and a light detector (E) arranged at an acute angle (a) in relation thereto, where the overlap zones of the transmitting lobe (SK) and the receiving lobe (EK) form a measurement zone (MR) in which smoke particles present produce a scattering of light to be received as reflected radiation, wherein the detector (E) is assigned at least one light source (S1, S2) in its direct vicinity, characterised in that a non- scattered light beam (SK1, SK2) which emanates from the light source emerges through an opening (61, Ö2) in the housing (G) of the sensor (M), where the angle (a) of the transmitting lobe (SK) is at least sufficiently small to correspond to the outlet opening (0), and where the housing has no opening at the point to which the receiving lobe (EK) extends.
2. An optical smoke sensor as claimed in Claim 1, characterised in that a plurality of light sources (S1, S2 ...) are arranged concentrically about a light detector (E).
3. An optical smoke sensor as claimed in Claim 1, characterised in that a plurality of light detectors (E 1, E2) are arranged concentrically about a light source (S).
4. An optical smoke sensor as claimed in Claim 1 or 2, characterised in that the receiving lobe (EK) is delimited by approximately parallel lines.
5. An optical smoke sensor comprising a light source (S) and a light detector (E) arranged at an acute angle (ß) in relation thereto, characterised in that the acute angle (ß) is substantially smaller than 45°.
6. An optical smoke sensor as claimed in one of the preceding Claims, characterised in that the transmitting lobe and receiving lobe (SK, EK) are aligned fundamentally at right angles to the sensor base (SOK).
EP84111255A 1983-09-23 1984-09-20 Optical smoke detector Expired EP0142672B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84111255T ATE28008T1 (en) 1983-09-23 1984-09-20 OPTICAL SMOKE DETECTOR.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3334545 1983-09-23
DE19833334545 DE3334545A1 (en) 1983-09-23 1983-09-23 OPTICAL SMOKE DETECTOR

Publications (2)

Publication Number Publication Date
EP0142672A1 EP0142672A1 (en) 1985-05-29
EP0142672B1 true EP0142672B1 (en) 1987-06-24

Family

ID=6209923

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84111255A Expired EP0142672B1 (en) 1983-09-23 1984-09-20 Optical smoke detector

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Country Link
EP (1) EP0142672B1 (en)
AT (1) ATE28008T1 (en)
DE (2) DE3334545A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3831654A1 (en) * 1988-09-17 1990-03-22 Hartwig Beyersdorf OPTICAL SMOKE DETECTOR
DE4414166C1 (en) * 1994-04-22 1995-12-07 Lorenz Mesgeraetebau Method and device for measuring light scattering on particles
EP0821330B1 (en) * 1996-07-22 2002-09-04 Siemens Building Technologies AG Smoke detector
EP0987663A1 (en) * 1998-09-14 2000-03-22 Siemens Building Technologies AG Optical smoke detector according to the extinguish principle and method for compensating the temperature drift
EP1017034B1 (en) * 1998-09-14 2003-08-27 Siemens Building Technologies AG Optical smoke detector according to the extinguish principle and method for compensating the temperature drift
RU2450361C1 (en) * 2010-12-28 2012-05-10 Общество с ограниченной ответственностью "Группа компаний "РУБЕЖ" Optical electric fire-smoke detector

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB729140A (en) * 1952-04-04 1955-05-04 Pyrene Co Ltd Improvements relating to smoke indicators
JPS5855446B2 (en) * 1975-07-15 1983-12-09 松下電工株式会社 Scattered light smoke detector
ZA763862B (en) * 1975-07-21 1977-05-25 Gen Signal Corp Photodiode smoke detector
GB1592475A (en) * 1977-09-06 1981-07-08 Cheung King Fung Smoke detectors
DE2951459C2 (en) * 1979-12-20 1984-03-29 Heimann Gmbh, 6200 Wiesbaden Optical arrangement for a smoke detector based on the light scattering principle

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Publication number Publication date
DE3464424D1 (en) 1987-07-30
DE3334545A1 (en) 1985-04-04
ATE28008T1 (en) 1987-07-15
EP0142672A1 (en) 1985-05-29

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