EP0360126A2 - 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
EP0360126A2
EP0360126A2 EP89116813A EP89116813A EP0360126A2 EP 0360126 A2 EP0360126 A2 EP 0360126A2 EP 89116813 A EP89116813 A EP 89116813A EP 89116813 A EP89116813 A EP 89116813A EP 0360126 A2 EP0360126 A2 EP 0360126A2
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EP
European Patent Office
Prior art keywords
light
receiver
measuring chamber
light source
smoke detector
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Granted
Application number
EP89116813A
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German (de)
English (en)
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EP0360126A3 (fr
EP0360126B1 (fr
EP0360126B2 (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
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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 operating an optical smoke detector according to the preamble of patent claim 1.
  • Optical smoke detectors contain at least one light source, for example in the form of a light-emitting diode (LED), which is usually operated in the infrared range, and a light-sensitive receiver, for example a photo element.
  • the radiation from the light source and the field of view of the light-sensitive receiver are usually directed; the elements are also arranged so that the photosensitive receiver is not directly exposed to the radiation from the light source.
  • Such smoke detectors take advantage of the fact that in the measuring chamber penetrated aerosols reflect the light radiation more or less strongly. The resulting scattered radiation also strikes the light-sensitive receiver. This responds and emits an alarm signal when the stray radiation has a predetermined intensity.
  • the measuring chamber naturally requires at least one opening through which the smoke can enter the measuring chamber.
  • An opening in the measuring chamber also allows light to enter.
  • the aim is to choose the optical arrangement in the measuring chamber so that it is largely shielded from the incoming light.
  • light entering the measuring chamber from outside leads to scattering due to multiple reflections on the walls of the measuring chamber.
  • the light source in the measuring chamber also causes stray radiation.
  • the scattered radiation composed of the components external light and light of the light source changes with increasing contamination of the measuring chamber walls. This pollution cannot be avoided at all because of the necessary entry opening for smoke.
  • Increasing pollution leads to an increase in the amount of scattered radiation.
  • the scattered radiation can assume values that exceed the response value of the light-sensitive receiver. Then there is a false alarm, which is known to be particularly uncomfortable in fire alarm systems.
  • the proportion of the scattered light from the light source that falls on the light-sensitive receiver when there is smoke in the measuring chamber is at most 1%. This clearly shows how serious the interference radiation caused by pollution can be.
  • An increase in the amount of interference radiation leads to an increase in the sensitivity of the smoke detector. Therefore, only small amounts of smoke are sufficient, which under certain circumstances do not yet pose a danger to trigger. False alarms can therefore already occur at a point in time when the amount of interference radiation is not yet sufficient to achieve the required response value of the light-sensitive receiver.
  • a smoke detector has become known which has two light-sensitive receivers.
  • the directional field of view of the first receiver crosses the radiation beam of the light source approximately perpendicularly.
  • the directional field of view of the second light-sensitive receiver extends approximately parallel to that of the first light-sensitive receiver past the light bundle of the light source, both receivers looking at a surface element on the wall of the measuring chamber, which in special cases can be the same.
  • the surface element is designed to absorb radiation.
  • the interference radiation component is to be compensated for by forming the difference between the output signals of the light-sensitive receivers. In the case of the known smoke detector, however, it is ignored that the disturbing scatter radiation from the entire space of the measuring chamber strikes the light-sensitive receiver.
  • the volume that generates the useful scattered radiation when smoke arrives has a significantly larger diameter than the radiation beam of the light source. Therefore, the stray radiation also strikes the second light-sensitive receiver. Compensation of the scattered radiation even when smoke is entering is therefore not possible.
  • the main disadvantage, however, is that the wall area viewed by the second light-sensitive receiver is the Measuring chamber is in the dark, so its reflection only reaches extremely low values that can hardly be processed by measuring technology. It is therefore scarcely possible, or only with a very high level of metrological effort, to detect scattered radiation caused by contamination of the measuring chamber.
  • DE-PS 27 54 139 it has also become known to provide a single light-sensitive receiver which is pivoted with the aid of a corresponding actuating device in order to either let the directed field of view cross the light beam of the light source or "see" past the light beam. . It is optionally proposed to design the light source to be pivotable.
  • the pivoting of an optical system or a light source with the aid of a suitable mechanism, for example an electromagnetic actuation, is extremely complex for optical smoke detectors. Furthermore, these embodiments do not lead to better consideration of the scattered radiation caused by contamination.
  • a smoke detector has become known from EP-0 079 010, in which a second light-sensitive element is located directly is exposed to the light from the light source. With the aid of the second light-sensitive element, the intensity of the light from the light source is measured and can be used for regulation in order to maintain the sensitivity to smoke despite the light source being contaminated.
  • an optical smoke detector has become known in which a light-sensitive receiver is surrounded by two or more light sources, the light beams of which cross the directional field of view of the receiver at an angle.
  • the light beams exit through openings in the smoke detector housing.
  • the purpose of this smoke detector is to avoid the disadvantage of a complicated and large labyrinth of conventional smoke detectors, the scattered light from the backward radiation being optimally used.
  • the known smoke detector does not take into account interference radiation caused by contamination.
  • the invention has for its object to provide a method for operating an optical smoke detector, the reliably prevents with very little effort that the stray radiation caused by contamination of the measuring chamber leads to a false alarm.
  • the measurement method according to the invention therefore leads to a relatively high signal level representative of the contamination, which can be processed by circuitry with simple components.
  • the increase in the signal level resulting from increasing dust deposition is a measure of the associated increase in interference radiation. If this level reaches a predetermined value, a maintenance signal can be issued, which, for example, is a reason to dismantle and clean the smoke detector.
  • the maintenance signal can also be used to change the sensitivity of the light-sensitive receiver receiving the useful scattered radiation accordingly. According to one embodiment of the invention, this can be done in that the photosensitive receiver receiving the useful scatter radiation is followed by a threshold value stage that can be changed in the threshold value.
  • the control signal is applied to the control input of the threshold value stage and increases the threshold value when the output signal of the light-sensitive receiver receiving the interference scatter radiation reaches a predetermined value.
  • the response threshold for emitting an alarm signal is therefore increased if a certain degree of contamination is found in the measuring chamber.
  • the response sensitivity when smoke occurs can be approximately the same being held. Otherwise it would increase with increasing pollution, so that less and less smoke is required to generate an alarm signal.
  • the response sensitivity for smoke detection can also be adjusted in several stages. Furthermore, it is easily possible to recognize different degrees of contamination and to signal them to a corresponding receiving device.
  • the maintenance signal can be used to block the alarm circuit in order to avoid the risk of a false alarm due to excessive interference radiation.
  • a particular advantage of the invention also lies in the fact that the interference radiation can be taken into account or compensated for even when there is smoke in the measuring chamber. If smoke is below the alarm threshold in the measuring chamber, it causes less reflection radiation to fall from the irradiated wall surface onto the receiver receiving the scattered radiation in the test phase. However, this is almost replaced by the reflection on smoke particles in the radiation beam. Therefore, with a constant degree of contamination, the intensity of the stray radiation incident on the optical receiver remains approximately the same with a relatively small amount of smoke.
  • both a separate light source and a separate light-sensitive receiver can be provided in order to measure the reflection of a surface area of the measuring chamber wall.
  • the effort for this is naturally greater than if only one additional light source or only one additional light-sensitive receiver is used alone.
  • care must be taken to ensure that the radiation for the additional light-sensitive receiver does not strike the actual user receiver and that the user receiver itself does not receive any scattered radiation from the additionally illuminated chamber wall. The latter requirement is not so important because the two optical measuring sections can only be optionally switched to the operating state by appropriate pulse-like control.
  • the optical arrangement of the smoke detector shown has an optical transmitter 10, a first optical receiver 11 and a second optical receiver 12.
  • the optical transmitter 10 has a light-emitting diode 13 (LED), which is preceded by a collecting lens 14.
  • the Optical receiver 11 has a photo element 15, to which a converging lens 16 is arranged.
  • the second optical receiver 12 has a photo element 17, to which a converging lens 18 is arranged.
  • Optical transmitter 10 and optical receiver 11, 12 are sunk into channels or bores, as shown for transmitter 10 and receiver 11 at 19 and 20, respectively. Due to the lens 14, the optical transmitter 10 has a directional radiation, which is designated by 21. Due to the lens 16, the photo element 15 has a directional field of view, which is designated by 22.
  • the optical receiver 12 also has a directional field of view, which is designated by 23.
  • the optical arrangement described is located within a cylindrical housing 30, the upper end of which is omitted in FIG. 2. It includes an electrical circuit arrangement and a fastening device for attaching the smoke detector, for example to the ceiling of a building room.
  • Slits 31 are formed circumferentially spaced near the lower end wall of the housing 30, from which inward angled portions 32, 33 extend.
  • the angled sections 32, 33 are intended to prevent too much outside light from entering the measuring chamber 35 formed in the housing 30. All parts in the measuring chamber, especially their walls black to ensure maximum absorption.
  • the axes of the optical transmitter 10 and the optical receiver 11 are arranged such that the radiation 21 of the optical transmitter 10 crosses the field of view 22 of the optical receiver 11, but does not fall directly onto the lens 16 . Ideally, therefore, only the scattered radiation, which is caused by smoke that has penetrated into the measuring chamber 35, falls on the optical receiver 11 in the volume within which the radiation 21 and the visual field 22 intersect.
  • Such an optical arrangement for smoke measurement is, however, state of the art.
  • the radiation 21 from the optical transmitter 10 strikes the obliquely inwardly pointing section 32 of the housing wall, approximately at right angles.
  • the irradiated area is labeled 36.
  • the field of view 22 of the optical receiver 12 is now aligned in such a way that it detects the area 36 irradiated by the optical transmitter 10, and likewise approximately perpendicular to the section 32. Part of the light reflected by the irradiated surface therefore falls on the optical receiver 12. Since, as mentioned, the measuring chamber 35 is formed by black boundary surfaces, the smoke results in the new state almost zero reflection. However, this changes when dust particles settle inside the measuring chamber 35. The more dust there is in the area 36, the more the light coming from the transmitter 10 is reflected.
  • the optical receiver 12 measures the intensity of the reflected radiation and emits a corresponding output signal. It is therefore representative of the degree of contamination of the measuring chamber by the ingress of dust and thus also of the scattered radiation in the measuring chamber 35 in general. It cannot be avoided that outside light penetrates into the measuring chamber 35 via the slots.
  • the radiation 21 from the optical transmitter 10 generates a scattered radiation in the chamber 35. Both stray radiation components can assume a level that the optical receiver 11 responds, although there is no useful stray radiation due to the occurrence of smoke. Even if the interference scatter radiation does not yet reach such a value, it leads to an undesired falsification of the measurement results brought about by the useful scatter radiation.
  • 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 or 66, to which a converging lens 67, 68 is connected upstream.
  • the optical receiver 50 has a photo element 70, which is preceded by a converging lens 71.
  • the optical transmitters 51, 52 and the optical receiver 50 are sunk into channels or bores in the housing 30, as shown for transmitters 51 and receivers 50 at 72 and 73, respectively. Due to the lens 67, the optical transmitter 51 has a directional radiation, which is denoted by 76. Due to the lens 71, the photo element 70 has a directional field of view, which is designated by 77.
  • the transmitter 52 has a directed beam, which is designated 78.
  • the axes of the optical transmitter 51 and the optical receiver 50 are arranged in such a way that the radiation 76 crosses the field of view 77 of the optical receiver 11 and therefore does not fall on the lens 71.
  • the scattered radiation which is caused by smoke that has entered the measuring chamber 35, falls on the optical receiver 50 in the volume within which the radiation 76 and the visual field 77 cross.
  • Such an optical arrangement for smoke measurement is, as already mentioned, known.
  • the radiation from the optical transmitter 52 strikes the obliquely inward-facing section 32 of the housing wall, approximately at right angles.
  • the irradiated area is labeled 80.
  • the field of vision of the recipient gers 50 is also aligned so that it detects the area 80 irradiated by the optical transmitter 52, and also approximately perpendicular to the section 32. Part of the light reflected by the irradiated surface therefore falls on the optical receiver 50. Since, as mentioned, the measuring chamber 35 is formed by black boundary surfaces, the new state of the smoke detector results in a reflection of almost zero. However, this changes when dust particles settle inside the measuring chamber 35. The more dust there is in the area 36, the more the light coming from the transmitter 52 is reflected.
  • the optical receiver 50 measures the intensity of the reflected radiation and emits a corresponding output signal. It is therefore representative of the degree of contamination of the measuring chamber by dust penetration and thus also of the scattered radiation in the measuring chamber 35 in general. However, it should be mentioned, and this will be explained further below with reference to further figures, that the light transmitters 51, 52 are operated alternately, the interference scatter radiation which is caused by contamination of the measuring chamber being measured only when the light source 52 is in operation.
  • FIG. 5 shows a circuit arrangement for operating the optical arrangement of the smoke detector according to FIGS. 1 and 2 shown.
  • the optical receivers 11 and 12 are connected to an amplifier and control circuit 41 via an electronic switch 40.
  • the circuit 41 is connected to a maintenance detection 43 via an AND gate 42. It is also connected to the optical transmitter 10, which works, for example, in the infrared range.
  • the circuit 41 is also connected to a decadal counter 44, which in turn is connected to the output of the amplifier and control circuit 41.
  • the output of the counter 44 is at the input of an AND gate 45, the further input of which is connected to the output of the circuit 41.
  • the output of the AND gate 45 is connected to the electronic switch 40.
  • the output of the counter 44 is connected to the input of a NAND gate 46, the output of which is connected to the input of a further AND gate 47.
  • the further input of the AND gate 47 is connected to an output of the amplifier and control circuit 41.
  • the output of the AND gate 47 goes to an alarm circuit 48.
  • the circuit shown operates as follows.
  • the optical transmitter 10 generates a pulse light. Simultaneously with the triggering of the light transmission pulse, the optical receiver 11 is activated, ie switched ready to receive. No use occurs in the normal state of the optical detector scattered in the beam path 21 of the optical transmitter 10, the optical receiver 11 is deactivated after the transmission pulse has ended. If the optical receiver generates a significant output signal during a light transmission pulse, the amplifier and control circuit 41 generates a corresponding pulse which spontaneously stops the decadal counter 44. Continuing transmission pulses from the amplifier and control circuit 41 can no longer change the counter reading. If a smoke signal is also detected during the following transmission pulses, a second output of the control circuit 41 becomes active and generates the AND condition for the AND gate 47. The alarm circuit 48 is then activated. The further AND condition for the AND gate 47 is generated by the output of the NAND gate 46 if the counter 44 does not output a corresponding output signal.
  • the counter 44 After a predetermined number of, for example, m transmission pulses, which is counted by the counter 44, the counter 44 generates an output signal which is sent to the electronic switch 40 via the AND gate 45 if the further AND condition generates a transmission clock was present.
  • the electronic switch 40 now connects the second optical receiver 12 with the amplifier and transmitter circuit 41 in order to initiate a test phase.
  • the electronic switch switches back to the original position in the smoke detection phase. It should also be mentioned that smoke detection is suppressed during the test phase.
  • the aforementioned NAND gate 46 is used for this purpose, the output signal of which is switched when a counter output signal is generated. As a result, an alarm signal can no longer be given to the alarm circuit 48 via the AND gate 47, even if the alarm condition is present. If, however, the radiation reflected from the chamber wall and incident on the optical receiver 12 exceeds a predetermined level, the optical receiver 12 generates an output signal; thereupon the amplifier and control circuit 41 in turn spontaneously sends a stop signal to the counter 44.
  • the interlock for smoke detection thus remains and the amplifier and control circuit is further connected to the receiver 12. Continuing transmission pulses from the amplifier and control circuit can no longer change the counter reading. If a correspondingly large scattered light strikes the optical receiver during the next n transmission pulses without interruption, a second output at the amplifier and control circuit 41 is activated and thus supplies the necessary one AND condition to the AND gate 42. The output of the AND gate 42 drives the maintenance circuit 43. For example, it can show the viewer what degree of contamination the chamber wall has reached. A corresponding display in the connected monitoring center can take place optically and / or acoustically.
  • optical receiver 50 In the embodiment according to FIG. 6, only a single optical receiver 50 is provided. Associated with it are an optical transmitter 51 for smoke detection and an optical transmitter 52 for determining contamination. Optical receiver 50 and optical transmitter 51 work in the same Chen together as the corresponding optical arrangement of FIG. 5. The directional radiation of the transmitter 52 is directed to a surface of the measuring chamber wall, which is in the field of view of the optical receiver 50.
  • the optical transmitters 51, 52 receive their clock pulses from the amplifier and control circuit 53, which is connected via an AND gate 54 at the input of the optical transmitter 52.
  • An AND gate 55 is arranged between the circuit 53 and the optical transmitter 51.
  • the clock pulses also reach a decadal counter 56, the output of which forms the second input of the AND gate 54.
  • a NAND gate 57 is connected, the output of which is connected to the second input of AND gate 55 and an input of AND gate 58.
  • An output of the amplifier and control circuit 53 is connected to an AND gate 59, the second input of which is connected to the output of the counter 56.
  • a maintenance circuit 60 is connected to the output of the AND gate 59.
  • An alarm circuit 51 is connected to the output of the AND gate 58.
  • the optical transmitter 51 is driven in pulses, the output of the NAND gate 57 generating the second AND condition in the AND gate 55.
  • the transmitter 52 is deactivated because the counter 56 has no corresponding output signal generated. If the output signal of the optical receiver 50 exceeds a predetermined value, the counter 56 is spontaneously stopped by the amplifier and control circuit, as already described in relation to FIG. 5, in order to bring about the necessary electronic interlocks and only after a predetermined number of measuring pulses the alarm circuit 61 triggered via the AND gate 58 by being driven by the amplifier and control circuit 53.
  • the second AND condition is generated via the output of the NAND gate 57.
  • the counter 56 If the number of transmit pulses preset in the counter is reached, the counter 56 generates a predetermined output signal, as a result of which the AND gates 55 and 58 are blocked via the NAND gate 57. A light pulse is now emitted by the optical transmitter 52 while the optical receiver 50 is activated synchronously. If the output signal of the optical receiver 50 exceeds a predetermined level, an electronic lock is first brought about in order to control the maintenance circuit 60 via the AND gate 59 after a predetermined level remains during a number of n measuring pulses. The second condition of the AND gate 59 is fulfilled by the output signal of the counter 56.
  • the processing of the signal input to the maintenance circuit 60 can be done as it is has been described in connection with FIG. 5.
  • the test phase described last also only lasts a predetermined number of transmission pulses, after which the counter 56 is reset.
  • the smoke detection phase and test phase are then started again alternately in the manner described above.
  • FIG. 7 shows a first time axis 100, which shows analog variables for the state of the measuring chamber, for example the measuring chamber 35 according to FIGS. 1 and 2, specifically for the smoke 101, which is shown with increasing tendency, for the scattered radiation of pollution, which is indicated with 104 and for which the increase in scattered radiation 104 'and the tracking threshold 102'.
  • Light pulses 106 are shown on the time axis 105, which are emitted by the optical transmitter 10 according to FIG. 5, for example.
  • test light pulses 107 are shown, which are somewhat wider than the light pulses 106 for smoke measurement. They are also emitted by the optical transmitter 10 according to FIG. 5, namely according to the recording in FIG. 7 after every four pulses 106.
  • Output pulses 111 for example from the optical receiver 11, and output pulses 108 from the optical receiver 12 are shown on the time axis 110. They are the reaction to light pulses 106 and 107, respectively recognizes that when the measuring chamber is still unpolluted (new condition), the output signal of the optical receiver 12, which corresponds to the reflection of the light pulse on a surface of the measuring chamber wall, is relatively low, but is already at a higher level than the output signal of the optical receiver 11. With the smoke increase the output pulses 111 of the optical receiver 11 also become larger in the measuring chamber.
  • the optical transmitter 10 controlled by the amplifier and control circuit 41, emits a light pulse sequence of a higher frequency. This can be seen at 106a. Accordingly, a pulse train 111a is generated at the output of the optical receiver 11. By generating a faster measuring pulse sequence over a certain time, it should be verified whether there is actually smoke in the measuring chamber.
  • the threshold value 102 can also be in the amplifier and control circuit are tracked. This is shown in the dash-dotted curve above the time axis 100 in stage 114. A higher output signal is therefore required for the optical receiver 11 so that an alarm signal is generated via the amplifier and control circuit 41.
  • the threshold value can be set in the amplifier and control circuit 41.
  • the threshold value for the pulses 108 which represent the degree of contamination, must also be reduced as a result, as shown at 113 '.
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 true EP0360126A2 (fr) 1990-03-28
EP0360126A3 EP0360126A3 (fr) 1991-02-06
EP0360126B1 EP0360126B1 (fr) 1994-02-16
EP0360126B2 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 (7)

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EP0530723A1 (fr) * 1991-09-06 1993-03-10 Cerberus Ag Détecteur optique de fumée avec surveillance active
DE102009054141A1 (de) 2009-11-13 2011-05-19 Job Lizenz Gmbh & Co Kg Verfahren zum Prüfen der Funktion eines Rauchmelders
DE10104861B4 (de) * 2001-02-03 2013-07-18 Robert Bosch Gmbh Verfahren zur Branderkennung
EP2808669A1 (fr) * 2013-05-31 2014-12-03 Durag GmbH Dispositif de mesure de la lumière diffusée à partir d'un volume de mesure en compensant les signaux d'arrière-plan
EP3474249A3 (fr) * 2017-09-28 2019-07-10 Robert Bosch GmbH Dispositif de mesure destiné à la mesure de particules
CN110296959A (zh) * 2008-06-10 2019-10-01 爱克斯崔里斯科技有限公司 粒子检测
EP3916691A1 (fr) * 2020-05-25 2021-12-01 Robert Bosch GmbH Procédé de détection de contamination d'un détecteur d'incendie, détecteur d'incendie, programme informatique et support d'enregistrement lisible par machine

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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
JPH09270085A (ja) * 1996-04-01 1997-10-14 Hamamatsu Photonics Kk 発煙検知装置
KR100470235B1 (ko) * 1997-05-29 2005-02-07 호치키 가부시키가이샤 광전자 스모크 센서용 광 투사 장치
DE10118913B4 (de) * 2001-04-19 2006-01-12 Robert Bosch Gmbh Streulichtrauchmelder
GB2397122B (en) * 2003-01-03 2006-02-08 David Appleby Fire detector with low false alarm rate
US7034702B2 (en) * 2003-12-23 2006-04-25 Robert Bosch Gmbh Optical smoke detector and method of cleaning
DE102004001699A1 (de) * 2004-01-13 2005-08-04 Robert Bosch Gmbh Brandmelder
DE102004023524B3 (de) * 2004-05-13 2005-09-15 Job Lizenz Gmbh & Co. Kg Verfahren zur Erfassung und Meldung von Betauungen in Rauchmeldern
DE102005025183A1 (de) * 2005-06-01 2006-12-07 Sick Engineering Gmbh Partikelkonzentrations-Messvorrichtung und Justageverfahren hierfür
CN102232183B (zh) 2008-09-05 2015-01-14 爱克斯崔里斯科技有限公司 微粒特性的光学探测
DE102014110460B3 (de) * 2014-07-24 2015-05-13 Eq-3 Entwicklung Gmbh Optischer Rauchmelder und Verfahren zur optischen Rauchdetektion
RU2565492C1 (ru) * 2014-11-28 2015-10-20 Санкт-Петербургский филиал ОАО "Воентелеком" Система противопожарной защиты контейнерной базовой несущей конструкции
EP3073458A1 (fr) * 2015-03-23 2016-09-28 Siemens Schweiz AG Dispositif d'alerte d'incendie doté d'un agencement à écran diffusant dans la zone d'un orifice d'entrée de fumée destiné à la surveillance de l'encrassement
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Cited By (10)

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Publication number Priority date Publication date Assignee Title
EP0530723A1 (fr) * 1991-09-06 1993-03-10 Cerberus Ag Détecteur optique de fumée avec surveillance active
US5381130A (en) * 1991-09-06 1995-01-10 Cerberus Ag Optical smoke detector with active self-monitoring
DE10104861B4 (de) * 2001-02-03 2013-07-18 Robert Bosch Gmbh Verfahren zur Branderkennung
CN110296959A (zh) * 2008-06-10 2019-10-01 爱克斯崔里斯科技有限公司 粒子检测
DE102009054141A1 (de) 2009-11-13 2011-05-19 Job Lizenz Gmbh & Co Kg Verfahren zum Prüfen der Funktion eines Rauchmelders
EP2808669A1 (fr) * 2013-05-31 2014-12-03 Durag GmbH Dispositif de mesure de la lumière diffusée à partir d'un volume de mesure en compensant les signaux d'arrière-plan
WO2014191550A1 (fr) * 2013-05-31 2014-12-04 Durag Gmbh Dispositif de mesure de la lumière diffusée provenant d'un volume de mesure avec compensation de signaux en arrière-plan
US9678008B2 (en) 2013-05-31 2017-06-13 Durag Gmbh Device for measuring scattered light from a measurement volume with compensation for background signals
EP3474249A3 (fr) * 2017-09-28 2019-07-10 Robert Bosch GmbH Dispositif de mesure destiné à la mesure de particules
EP3916691A1 (fr) * 2020-05-25 2021-12-01 Robert Bosch GmbH Procédé de détection de contamination d'un détecteur d'incendie, détecteur d'incendie, programme informatique et support d'enregistrement lisible par machine

Also Published As

Publication number Publication date
EP0360126A3 (fr) 1991-02-06
EP0360126B1 (fr) 1994-02-16
ATE101739T1 (de) 1994-03-15
ES2049786T5 (es) 1999-08-16
US5008559A (en) 1991-04-16
DE3831654A1 (de) 1990-03-22
ES2049786T3 (es) 1994-05-01
DE58906980D1 (de) 1994-03-24
EP0360126B2 (fr) 1999-04-14
DE3831654C2 (fr) 1991-06-13
CA1331649C (fr) 1994-08-23

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