EP0360126B2 - Méthode d'opération d'un détecteur optique de fumée et détecteur de fumée pour la mise en oeuvre de la méthode - Google Patents

Méthode d'opération d'un détecteur optique de fumée et détecteur de fumée pour la mise en oeuvre de la méthode Download PDF

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Publication number
EP0360126B2
EP0360126B2 EP89116813A EP89116813A EP0360126B2 EP 0360126 B2 EP0360126 B2 EP 0360126B2 EP 89116813 A EP89116813 A EP 89116813A EP 89116813 A EP89116813 A EP 89116813A EP 0360126 B2 EP0360126 B2 EP 0360126B2
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EP
European Patent Office
Prior art keywords
light
sensitive receiver
measuring chamber
optical
smoke detector
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Expired - Lifetime
Application number
EP89116813A
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German (de)
English (en)
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EP0360126A3 (fr
EP0360126A2 (fr
EP0360126B1 (fr
Inventor
Hartwig Dipl.-Ing. Beyersdorf
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Individual
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Individual
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Priority to AT89116813T priority Critical patent/ATE101739T1/de
Publication of EP0360126A2 publication Critical patent/EP0360126A2/fr
Publication of EP0360126A3 publication Critical patent/EP0360126A3/fr
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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
    • 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
    • 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 method for the operation of an optical smoke detector the preamble of claim 1.
  • Optical smoke detectors contain at least a light source, for example in the form of a light emitting Diode (LED), mostly in the infrared range is operated, as well as a light-sensitive Receiver, for example a photo element.
  • a light source for example in the form of a light emitting Diode (LED), mostly in the infrared range is operated, as well as a light-sensitive Receiver, for example a photo element.
  • the radiation from the light source and the visual field of the photosensitive receiver are common directed; the elements are beyond that arranged so that the photosensitive receiver not directly the radiation of the light source is exposed.
  • Such smoke detectors turn on take advantage of the fact that penetrated into the measuring chamber Aerosols the light radiation more or reflect less strongly. The caused by it Scattered radiation also strikes the light-sensitive one Receiver. This responds and gives an alarm signal if the stray radiation hits a has predetermined intensity.
  • the measuring chamber naturally requires at least an opening through which the smoke enters the Measuring chamber can enter.
  • An opening in the Measuring chamber also allows the entry of Light.
  • Light entering the measuring chamber from the outside leads to scattering due to multiple reflections on the walls of the measuring chamber.
  • the Light source in the measuring chamber causes one Scattered radiation. Coming from the components of outside light and composing light from the light source Scattered radiation changes with increasing Contamination of the measuring chamber walls. Because of the necessary entry opening for smoke this pollution cannot be avoided at all.
  • Increasing pollution leads to increase the amount of scattered radiation.
  • the scattered radiation can assume values that the Response value of the light-sensitive receiver exceed. Then there is a false alarm, which is known to be special in fire alarm systems is felt uncomfortable.
  • the amount of scattered light from the light source, the smoke in the measuring chamber on the photosensitive receiver falls is at most 1%. This shows how serious it is the interference radiation increased by pollution can impact.
  • a smoke alarm has become known has two light-sensitive receivers. That directed Field of vision of the first recipient crosses the radiation beam of the light source approximately perpendicular.
  • the directional field of vision of the second photosensitive receiver extends approximately parallel to that of the first photosensitive Receiver on the light beam of the light source past, with both receivers a surface element look at the wall of the measuring chamber, which in the special case can be the same.
  • the surface element is radiation-absorbing.
  • the volume that the Ingress of smoke which generates stray radiation has a much larger diameter than that Beams of radiation from the light source. Therefore, the Stray radiation also on the second photosensitive Receiver. A compensation of the Scattered radiation even when smoke enters not possible.
  • the main disadvantage, however, is that that of the second photosensitive Receiver considered wall area of the measuring chamber is in the dark, so their reflection only extremely low values achieved, the metrological can hardly be processed. It is therefore hardly or only with a very high metrological Effort possible due to pollution of the Measuring chamber to detect scattered radiation.
  • DE-PS 27 54 139 In another embodiment of the DE-PS 27 54 139 has also become known, one to provide photosensitive receiver which with the help of an appropriate actuator is pivoted to selectively the directed Field of view the light beam of the light source to be crossed or past the bundle of lights " see ".
  • the light source is suggested trained swivel.
  • the pivoting optics or a light source with the help a suitable mechanism, for example one electromagnetic actuation, is for optiscne Smoke detectors are extremely complex. About that furthermore, these embodiments do not lead to better consideration of pollution caused scattered radiation.
  • EP-0 079 010 is a smoke detector become known in which a second photosensitive Element immediately with the light of the Light source is applied. With the help of the second photosensitive element, the intensity of the Light of the light source is measured and can be used for regulation used to smoke sensitivity to maintain despite the light source being contaminated.
  • An optical smoke detector has become known from DE-A-42 42 673, at least for the detection of smoke a light-sensitive receiver the useful scatter radiation measures that starts from a spatial element that is in the intersection area the directional field of view of the photosensitive Receiver and the directed beam of a light source lies.
  • a second photosensitive receiver the radiation that starts from the measuring chamber wall, the reflection radiation of an illuminated surface element is measured.
  • the Field of view of the second light-sensitive receiver however also other areas of the measuring chamber wall.
  • the circuit of the well-known smoke detector is designed that the measured by the further photosensitive element Reflection radiation that from the first photosensitive Element measured stray light compensates for the influence the contamination of the measuring chamber wall on the smoke measurement to meet.
  • EP-A-0 076 338 discloses several To operate light sources sequentially for measurement purposes. This is the case, for example, with an arrangement such that those in the directional field of view of a second photosensitive Surface of the measuring chamber lying on the receiver Light source is irradiated.
  • the invention is based on the object Method for operating an optical smoke detector specify that with very little effort certainly prevents that from pollution scattered radiation into one caused by the measuring chamber False alarm.
  • Signal level is a measure of the associated Increase in interference radiation. Reached this level a predetermined value, a Maintenance signal are given, for example The reason is to dismantle the smoke detector and clean.
  • the maintenance signal can also used to adjust the sensitivity of the the light-sensitive receiving the stray radiation To change the recipient accordingly.
  • This can according to an embodiment of the invention happen that the useful scattered radiation receiving photosensitive receiver threshold level changeable in the threshold value is connected downstream.
  • the control signal is on the Control input of the threshold value given and increases the threshold when the output signal of the light-sensitive receiving the interference scatter radiation A given recipient Value reached.
  • the response threshold for the submission an alarm signal is therefore increased when a certain degree of contamination in the measuring chamber is detected.
  • a particular advantage of the invention also lies in that consideration or compensation interference radiation can also occur if there is smoke in the measuring chamber. Located smoke in the measuring chamber below the Alarm threshold, it causes that in the test phase less reflection radiation from the irradiated Wall surface on the one receiving the scattered radiation Recipient falls. However, this becomes approximate replaced by the reflection on smoke particles in the Radiation beam. Therefore stay at a constant Degree of pollution the intensity of the on the optical receiver stray interference radiation approximately with a relatively small amount of smoke equal.
  • both are separate Light source as well as a separate photosensitive Receiver can be provided to the reflection of a surface area of the measuring chamber wall to eat.
  • the effort for this is natural larger than when using only one additional Light source or only one additional photosensitive receiver alone.
  • the latter requirement is not so essential because by appropriate pulse-like control the two optical measuring sections are only optional be switched to the operating state can.
  • the optical arrangement of the smoke detector shown has an optical transmitter 10, one first optical receiver 11 and one second optical receiver 12.
  • the optical Transmitter 10 has a light-emitting diode 13 (LED) on, which upstream of a converging lens 14 is.
  • the optical receiver 11 has a photo element 15, which is preceded by a converging lens 16 is.
  • the second optical receiver 12 has one Photo element 17, which is preceded by a converging lens 18 is.
  • Optical transmitter 10 and optical receiver 11, 12 are sunk in channels or bores arranged as for the transmitter 10 or the receiver 11 at 19 and 20 respectively.
  • the optical transmitter 10 has due to the lens 14 a directed radiation, designated by 21 is. Due to the lens 16, the photo element 15 a directed field of view, which with 22 is designated.
  • the optical receiver 12 has also a directional field of vision, which at 23 is designated.
  • the optical arrangement described is located within a cylindrical housing 30, the upper end of which is omitted in FIG. 2.
  • An electrical circuit arrangement belongs to it and a fastening device for attachment of the smoke detector, for example on the Ceiling of a building room.
  • Near the bottom End wall of the housing 30 are circumferential spaced slots 31 formed, of which inward angled sections 32, 33 extend.
  • the angled sections 32, 33 are said to prevent too much outside light from entering the Housing 30 formed measuring chamber 35 occurs. All parts in the measuring chamber, in particular their walls are black to a maximum To ensure absorption.
  • the radiation 21 of the optical transmitter 10 meets the sloping inward section 32 of the housing wall, approximately at a right angle.
  • the irradiated area is with 36 designated.
  • the visual field 22 of the optical Receiver 12 is now aligned so that it the area irradiated by the optical transmitter 10 36 detected, and also approximately perpendicular to section 32. On the optical receiver 12 therefore falls part of that of the irradiated Area of reflected light. Since, as mentioned, the Measuring chamber 35 of black boundary surfaces is formed in the new state of the Smoke detector has a reflection of almost zero. However, this changes when there are dust particles settle inside the measuring chamber 35. The more Dust is in area 36, all the more so there is a reflection of the coming from the transmitter 10 Light.
  • the optical receiver 12 measures the Intensity of reflected radiation and inputs corresponding output signal. It is therefore representative of the degree of pollution of the Measuring chamber through penetrating dust and thus also for the scattered radiation in the measuring chamber 35 general. It cannot be avoided that Outside light through the slits into the measuring chamber 35 penetrates.
  • the radiation 21 generates optical transmitter 10 in the chamber 35 a Scattered radiation. Both stray radiation components can assume a height that the optical receiver 11 responds, although useful scattered radiation due to the occurrence of smoke. Even if the interference radiation is such If the value has not yet been reached, it leads to a unwanted falsification of the radiation from the use induced measurement results.
  • the optical arrangement according to FIGS. 3 and 4 has two optical transmitters 51, 52 and an optical receiver 50.
  • the optical transmitters have a light-emitting diode 65 and 66 on which a converging lens 67, 68 is connected upstream is.
  • the optical receiver 50 has a photo element 70, which is preceded by a converging lens 71 is.
  • the optical transmitter 51, 52 and the optical Receivers 50 are in channels or holes in Housing 30 sunk, as for transmitters 51 and receiver 50 at 72 and 73 respectively.
  • the optical transmitter 51 faces due to the lens 67 a directed radiation, designated by 76 is. Because of the lens 71, the photo element 70 a directed field of view that is designated 77.
  • the transmitter 52 has a directed beam, which with 78 is designated.
  • the axes of the optical transmitter 51 and the optical receiver 50 arranged so that the radiation 76 the field of view 77 of the optical receiver 11 crosses, therefore not on the lens 71 falls.
  • the optical receiver 50 ideally, therefore, only the scattered radiation falls by penetrating into the measuring chamber 35 Smoke is caused in the volume inside which the radiation 76 and the visual field 77 cross.
  • smoke measurement is known.
  • the radiation from the optical transmitter 52 hits on the obliquely inward section 32 the housing wall, approximately in the right Angle.
  • the irradiated area is labeled 80.
  • the field of view of the receiver 50 is also aligned so that it from the optical Transmitter 52 detects irradiated area 80, namely also approximately perpendicular to section 32.
  • the optical receiver 50 is therefore incident Part of the reflected from the irradiated area Light. Since, as mentioned, the measuring chamber 35 of black boundary surfaces is formed a reflection when the smoke detector is new of almost zero. However, this changes if there are dust particles inside the measuring chamber 35 discontinue. The more dust there is in the area 36 is located, the more there is a reflection of the light coming from the transmitter 52.
  • the optical one Receiver 50 measures the intensity of the reflected Radiation and gives a corresponding output signal from. It is therefore representative of the degree of pollution the measuring chamber by penetrating Dust and therefore also for scattered radiation in the measuring chamber 35 in general. However, it is to mention, and this is illustrated by other figures explained further below that the light transmitter 51, 52 are operated alternately, the Interference radiation caused by pollution of the Measurement chamber is caused only in the operation of the Light source 52 is measured.
  • FIG. 5 is a circuit arrangement for Operation of the optical arrangement of the smoke detector shown in Figures 1 and 2.
  • the optical receivers 11 and 12 are over a electronic switch 40 with an amplifier and control circuit 41 connected.
  • the circuit 41 is via an AND gate 42 with a maintenance detection 43 connected. It is also with the optical transmitter 10 connected, for example works in the infrared range.
  • the circuit 41 is finally also with a decadal counter 44 connected, which in turn is connected to the exit of the Amplifier and control circuit 41 is connected.
  • the output of counter 44 is at the input an AND gate 45, whose further input with is connected to the output of the circuit 41. Of the Output of the AND gate 45 is with the electronic Switch 40 connected.
  • the output of the Counter 44 is connected to the input of a NAND gate 46 connected, the output of which Input of a further AND gate 47 connected is.
  • the further input of the AND gate 47 is with an output of the amplifier and control circuit 41 connected.
  • the exit of the AND gate 47 goes to an alarm circuit 48 Circuit works as follows.
  • Controlled by the amplifier and control circuit 41 generates the optical transmitter 10 Pulse light. Simultaneously with the triggering of the Light transmission pulse becomes the optical receiver 11 activated, i.e. switched ready to receive. Occurs in Normal state of the optical detector, no useful stray light in the beam path 21 of the optical transmitter 10 on, after the transmission pulse the optical receiver 11 is deactivated. Generated the optical receiver during a Light transmission pulse a significant output signal, generates the amplifier and control circuit 41 a corresponding impulse that spontaneously the decadic counter 44 stops. Continuing transmission pulses from the amplifier and control circuit 41 can no longer change the counter reading.
  • the counter 44 After a predetermined number of, for example m transmit pulses counted by the counter 44 the counter 44 generates an output signal, that via the AND gate 45 on the electronic Switch 40 is given if the further AND condition, that a send clock was generated.
  • the electronic switch 40 now switches the second optical receiver 12 with the Amplifier and transmit circuit 41 together to initiate a test phase.
  • Transmit pulses from the amplifier and Control circuit can not count change more. Meets during the next n Transmit pulses also without interruption the optical receiver during the light transmission pulse a correspondingly large amount of stray light becomes a second output on the amplifier and Control circuit 41 activates and thus delivers the necessary AND condition to the AND gate 42.
  • the output of the AND gate 42 controls the maintenance circuit 43 on. For example, you can Viewers show what degree of pollution has reached the chamber wall.
  • a corresponding Display in the connected monitoring center can be done optically and / or acoustically.
  • a corresponding output signal of the Maintenance circuit 43 on the amplifier and transmitter circuit 41 is given, for example, the Responsiveness when smoke occurs to reduce according to pollution the degree of pollution a perfect Allows smoke detection, the one shown works Circuit continues in the usual cycle. Reached however, the degree of pollution is critical Size so as to avoid a false alarm also suppresses another smoke measurement will. It is understood that through a appropriate design of the maintenance circuit 43 also different degrees of pollution can be recognized and displayed.
  • optical receiver 50 is only one only optical receiver 50 is provided. Him are assigned an optical transmitter 51 for the Smoke detection and an optical transmitter 52 for Determination of pollution. Optical receiver 50 and optical transmitter 51 work in the the same way together as the corresponding one optical arrangement according to Fig. 5.
  • the directed Radiation from transmitter 52 is on an area of the Measuring chamber wall directed in the visual field of the optical receiver 50.
  • the optical Transmitters 51, 52 receive their clock pulses from the Amplifier and control circuit 53, these via an AND gate 54 at the input of the optical Sender 52 lies. Between the circuit 53 and the optical transmitter 51 is an AND gate 55 arranged. The clock pulses also arrive a decadal counter 56, the output of which forms the second input of the AND gate 54.
  • a NAND gate 57 switched, its output with the second input of the AND gate 55 and an input of the AND gate 58 is connected.
  • An exit from Amplifier and control circuit 53 is with one AND gate 59 connected, the second input is connected to the output of counter 56.
  • a maintenance circuit 60 connected.
  • an alarm circuit 51 is connected.
  • the optical transmitter 51 driven in pulses, wherein the output of the NAND gate 57 is the second AND condition generated in the AND gate 55.
  • the smoke detection phase is the transmitter 52 disabled since counter 56 does not have a corresponding one Output signal generated.
  • the counter 56 spontaneously from the amplifier and control circuit stopped to the necessary bring about electronic interlocks and only after a predetermined number of Measuring pulses, the alarm circuit 61 on the AND gate 58 triggered by it from the amplifier and control circuit 53 is driven.
  • the second AND condition is over the output of the NAND gate 57 is generated.
  • counter 56 If the number of When transmission pulses are reached, counter 56 generates an predetermined output signal, which means that NAND gate 57 and AND gates 55 and 58 blocked will. Now the optical transmitter 52 a light pulse is emitted during the optical receiver 50 is activated synchronously. Exceeds the output signal of the optical receiver 50 a predetermined level, will first brought about an electronic lock to after further pending a predetermined level during a number of n measuring pulses the maintenance circuit 60 via the AND gate 59 controlled. The second condition of the AND gate 59 is by the output signal of the counter 56 met.
  • the processing of the in the maintenance circuit 60 input signal can be in the way they occur in connection with Fig. 5 has been described. The last one described The test phase also only takes a predefined one Number of transmission pulses after which the counter 56 is put back again. Smoke detection phase and test phase are then alternately in started in the manner described above.
  • FIG. 7 shows a first time axis 100, which analog variables for the state of the measuring chamber, for example after the measuring chamber 35 Figures 1 and 2 reproduces, namely for the Rauch 101, plotted with increasing tendency is for the scattered radiation due to Pollution, which is indicated with 104 as well for which the increase in scattered radiation 104 ' and the tracking threshold 102 '.
  • On the light axis 106 is shown on the time axis 105, which, for example, from the optical transmitter 10 Fig. 5 are delivered.
  • test light pulses 107 which are slightly wider than that Light pulses 106 for smoke measurement. you will be likewise from the optical transmitter 10 according to FIG. 5 delivered, according to the record in Fig. 7 after every four pulses 106.

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Claims (8)

  1. Détecteur optique de fumée comportant :
    une chambre de mesure (35) absorbant, de préférence, fortement la lumière, à laquelle sont associés une source de lumière (10) et deux récepteurs (11, 12) sensibles à la lumière de telle façon que le champ optique dirigé (22) de l'un (11) des récepteurs sensibles à la lumière coupe le rayon dirigé (21) de la source de lumière et que le champ optique (23) du deuxième récepteur (12) sensible à la lumière est dirigé sur une surface (36) de la chambre de mesure,
    un circuit d'alarme (48) émettant un signal d'alarme si le signal de sortie du premier récepteur sensible à la lumière atteint une valeur prédéterminée,
       carcatérisé en ce qu'un circuit d'interprétation (43) émet un signal de commande si, en raison d'un encrassement de la chambre de mesure, le signal de sortie du deuxième récepteur sensible à la lumière atteint une valeur prédéterminée et
       en ce que la surface de la chambre de mesure qui se trouve dans le champ optique dirigé du deuxième récepteur (12) sensible à la lumière reçoit directement le rayonnement émis par une source de lumière (10).
  2. Détecteur optique de fumée comportant :
    une chambre de mesure (35) absorbant, de préférence, fortement la lumière, à laquelle sont associés une source de lumière (51) et au moins un récepteur (50) sensible à la lumière de telle façon que le champ optique dirigé (77) d'un premier récepteur sensible à la lumière coupe le rayon dirigé (76) de la source de lumière,
    un circuit d'alarme (48) émettant un signal d'alarme si le signal de sortie du récepteur sensible à la lumière atteint une valeur prédéterminée,
    et un dispositif optique qui détecte et traite une variation du signal de sortie du récepteur sensible à la lumière, variation provoquée par un encrassement de la chambre de mesure, caractérisé en ce qu'une deuxième source de lumière (52) envoie un rayonnement sur une surface de la chambre de mesure qui se trouve dans le champ optique du premier récepteur (50) sensible à la lumière ou d'un autre récepteur sensible à la lumière, étant entendu qu'un circuit de commande (40) active alternativement l'une des deux sources de lumière (51, 52),
       et en ce qu'un circuit d'interprétation (41, 48) est prévu, qui émet un signal de commande si le signal de sortie du récepteur (50) sensible à la lumière atteint, pendant la phase active de la deuxième source de lumière (52), une valeur prédéterminée.
  3. Détecteur optique de fumée suivant la revendication 1, caractérisé en ce que le premier et le deuxième récepteur (11, 12) sensible à la lumière sont reliés, par l'intermédiaire d'un inverseur (40), de préférence électronique, aux circuits d'interprétation et d'alarme (43, 48).
  4. Détecteur optique de fumée suivant l'une quelconque des revendications 1 à 3, caractérisé en ce que le circuit de commande coupe le circuit d'alarme quand le deuxième récepteur (12) sensible à la lumière est relié, par l'intermédiaire de l'inverseur (40) au circuit de contrôle (43, 60) ou quand la deuxième source de lumière (52) est activée.
  5. Détecteur optique de fumée suivant l'une quelconque des revendications 1 à 4, caractérisé en ce que le circuit de commande (40, 53) comporte un générateur d'impulsions et un compteur électronique réglable (44, 56), relié au générateur d'impulsions, compteur qui active le deuxième récepteur (12) sensible à la lumière et/ou la deuxième source de lumière (52) si une première position prédéterminée du compteur est atteinte et qui active le premier récepteur sensible à la lumière et/ou la première source de lumière (51) si une deuxième position du compteur est atteinte.
  6. Détecteur optique de fumée suivant la revendication 4 et la revendication 5, caractérisé en ce que l'inverseur (40) est commandé par un signal de sortie du compteur (44).
  7. Détecteur optique de fumée suivant l'une quelconque des revendications 1 à 6, caractérisé en ce que signal de contrôle est émis à un étage donnant une valeur-seuil, dont le signal de sortie coupe le circuit d'alarme si le signal de contrôle atteint une valeur prédéterminée.
  8. Détecteur optique de fumée suivant l'une quelconque des revendications 1 à 7, caractérisé en ce que la surface de la chambre de mesure (35) recevant le rayonnement émis par le premier ou le deuxième récepteur sensible à la lumière est disposée sensiblement en formant un angle de 90° avec l'axe optique respectivement de la première ou de la deuxième source de lumière.
EP89116813A 1988-09-17 1989-09-12 Méthode d'opération d'un détecteur optique de fumée et détecteur de fumée pour la mise en oeuvre de la méthode Expired - Lifetime EP0360126B2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89116813T ATE101739T1 (de) 1988-09-17 1989-09-12 Verfahren zum betrieb eines optischen rauchmelders sowie rauchmelder zur durchfuehrung des verfahrens.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3831654 1988-09-17
DE3831654A DE3831654A1 (de) 1988-09-17 1988-09-17 Optischer rauchmelder

Publications (4)

Publication Number Publication Date
EP0360126A2 EP0360126A2 (fr) 1990-03-28
EP0360126A3 EP0360126A3 (fr) 1991-02-06
EP0360126B1 EP0360126B1 (fr) 1994-02-16
EP0360126B2 true EP0360126B2 (fr) 1999-04-14

Family

ID=6363155

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89116813A Expired - Lifetime EP0360126B2 (fr) 1988-09-17 1989-09-12 Méthode d'opération d'un détecteur optique de fumée et détecteur de fumée pour la mise en oeuvre de la méthode

Country Status (6)

Country Link
US (1) US5008559A (fr)
EP (1) EP0360126B2 (fr)
AT (1) ATE101739T1 (fr)
CA (1) CA1331649C (fr)
DE (2) DE3831654A1 (fr)
ES (1) ES2049786T5 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105358962A (zh) * 2013-05-31 2016-02-24 杜拉革有限公司 用于在补偿背景信号的情况下测量来自测量体积的散射光的装置

Families Citing this family (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH683464A5 (de) * 1991-09-06 1994-03-15 Cerberus Ag Optischer Rauchmelder mit aktiver Ueberwachung.
CH684556A5 (de) * 1992-09-14 1994-10-14 Cerberus Ag Optischer Rauchmelder.
DE4333911C2 (de) * 1993-10-05 1998-10-22 Preussag Ag Minimax Optischer Rauchmelder
DE4414166C1 (de) * 1994-04-22 1995-12-07 Lorenz Mesgeraetebau Verfahren und Vorrichtung zur Messung der Lichtstreuung an Partikeln
FR2723233B1 (fr) * 1994-07-29 1996-10-04 Lewiner Jacques Perfectionnements aux detecteurs optiques de fumees
US5581241A (en) * 1994-08-12 1996-12-03 Voice Products Inc. Ultra-sensitive smoke detector
AUPN179995A0 (en) * 1995-03-17 1995-04-13 Vision Systems Limited Improvements relating to gas pollution detection equipment
EP0733894B1 (fr) * 1995-03-24 2003-05-07 Nohmi Bosai Ltd. Capteur pour détection des particules fines comme fumée
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DE3831654C2 (fr) 1991-06-13
EP0360126A3 (fr) 1991-02-06
ATE101739T1 (de) 1994-03-15
DE58906980D1 (de) 1994-03-24
ES2049786T3 (es) 1994-05-01
US5008559A (en) 1991-04-16
ES2049786T5 (es) 1999-08-16
EP0360126A2 (fr) 1990-03-28
DE3831654A1 (de) 1990-03-22
CA1331649C (fr) 1994-08-23
EP0360126B1 (fr) 1994-02-16

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