EP4339914A1 - Dispositif et procédé de fonctionnement d'un détecteur de fumée - Google Patents

Dispositif et procédé de fonctionnement d'un détecteur de fumée Download PDF

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Publication number
EP4339914A1
EP4339914A1 EP22196274.9A EP22196274A EP4339914A1 EP 4339914 A1 EP4339914 A1 EP 4339914A1 EP 22196274 A EP22196274 A EP 22196274A EP 4339914 A1 EP4339914 A1 EP 4339914A1
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EP
European Patent Office
Prior art keywords
optical signal
smoke detector
light guide
light
signal
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Granted
Application number
EP22196274.9A
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German (de)
English (en)
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EP4339914B1 (fr
EP4339914C0 (fr
Inventor
Norbert Karl SCHAAF
Tobias Viertel
Christoph Kroh
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Sept S Sas
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Atral Secal GmbH
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Priority to EP22196274.9A priority Critical patent/EP4339914B1/fr
Publication of EP4339914A1 publication Critical patent/EP4339914A1/fr
Application granted granted Critical
Publication of EP4339914B1 publication Critical patent/EP4339914B1/fr
Publication of EP4339914C0 publication Critical patent/EP4339914C0/fr
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
    • G08B29/02—Monitoring continuously signalling or alarm systems
    • G08B29/04—Monitoring of the detection circuits
    • G08B29/043—Monitoring of the detection circuits of fire detection circuits
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL 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

Definitions

  • the registration concerns a method for operating a smoke detector.
  • the application also relates to a processing device, a system for operating a smoke detector and a smoke detector.
  • Smoke detectors are conventionally used to use technical means to detect smoke resulting from a fire in fire-prone locations that are not subject to constant human supervision and to emit a signal indicating the presence of the smoke.
  • a smoke detector is usually installed at the location to be monitored, for example in a fire-prone room in a building.
  • the signal output can be in the form of an acoustic alarm, which is emitted by the smoke detector and which alerts people within earshot of the alarm to the presence of smoke.
  • the signal output can also take place in the form of an optical, electrical or electromagnetic signal, by radio or via a line, for example to a central security system of the building in question, to a public fire alarm center, to a user terminal of a resident, etc.
  • the signal can be transmitted some of these also take place via a private or public communication network.
  • smoke detector signals are sometimes also used to initiate technical processes, such as triggering an automatic extinguishing device.
  • Smoke detectors contain sensors to detect smoke. Optical measurement methods are mostly used. Light is usually emitted from a light source over a test path that runs through a volume of room air. A photosensor is arranged in the area of the test section. In the event that smoke particles enter the area of the test section via the room air, they cause increased absorption and scattering of the emitted light, which influences the light intensity recorded by the photosensor. The deviation of the recorded light intensity from a reference value that corresponds to smoke-free room air serves as a criterion for the assumed presence of smoke.
  • the photosensor In many smoke detectors, the photosensor is located outside the test section. Normally, little or no light from the light source reaches the sensor. When smoke enters the test section, the light is scattered more towards the sensor, among other things, which thereby detects increased light intensity. In other smoke detectors, the photosensor is located at the end of the test section. Normally there is light from the light source to the sensor unhindered. When smoke enters the test section, however, there is increased absorption and scattering of light away from the direction towards the sensor, which thereby detects a reduced light intensity.
  • Smoke detectors are therefore usually equipped with a housing in which the sensors are protected.
  • the housing has at least one opening through which ambient air can enter the housing for measurement using the sensors.
  • smoke inlet opening(s) are chosen to be as small as possible in order to largely avoid the penetration of ambient light into the measuring area, i.e. the so-called smoke chamber within the housing.
  • a small smoke inlet opening also delays the entry of dust, which usually settles in the smoke chamber over a period of use of the smoke detector and also has an increased influence on the propagation behavior of the sensor light there, in particular through reflection on the inside of the housing, as the amount of dust increases.
  • the smoke inlet opening must be chosen to be sufficiently large to allow unhindered circulation of ambient air in and out of the smoke chamber and to prevent the smoke inlet opening from becoming clogged, for example due to dust, steam and grease deposits from the ambient air, or at least to have an intended use. or to delay the maintenance interval of the smoke detector.
  • the dimensioning of the smoke inlet opening therefore often represents a compromise between the aforementioned conflicting requirements.
  • the choice of a suitable triggering threshold value for the deviation between a current sensor result and a reference value that corresponds to smoke-free room air is also crucial.
  • the triggering threshold value must be chosen to be sufficiently small in order to alert as early as possible in the event of a fire and also to point out fires with little smoke development.
  • the triggering threshold value must be chosen to be sufficiently large in order to avoid false alarms, for example due to harmless particles such as steam or dust, which are often unavoidably present in the room air. Determining the triggering threshold is therefore also based on a compromise between conflicting requirements.
  • the aforementioned criteria are also mutually dependent in that increasing sensor light scattering over the period of use of the smoke detector as a result of dust deposits in the smoke chamber means that an increasingly small number of particles in the air can cause the triggering threshold value to be exceeded. Um therefore To counteract an increased frequency of false alarms, it is known to adapt the triggering threshold value to an assumed deposit of dust in the smoke chamber over a period of use of the smoke detector.
  • the criteria are also mutually dependent in that progressive clogging of the smoke inlet opening by dust, vapor and grease deposits from the ambient air over a period of use of the smoke detector can inhibit the entry of smoke into the smoke chamber, thus delaying the exceeding of the triggering threshold in the event of a fire or absent altogether.
  • the measured light intensity at the output of the light guide allows conclusions to be drawn about the extent to which the smoke inlet opening of the smoke detector is blocked. Based on this, a maintenance requirement for the smoke detector can then be determined or the sensitivity of the smoke detector, i.e. the triggering threshold, can also be set.
  • a method for operating a smoke detector includes detecting, by means of at least one sensor device, at least a first optical signal that is transmitted by means of a first light guide, and a second optical signal that is transmitted by means of a second light guide.
  • the method further comprises determining at least one signal property of each of the first optical signal and the second optical signal, wherein the signal property indicates a light-guiding behavior of the first or second light guide, and evaluating, by means of a processing device, the signal property of the first optical signal and the second optical signal in relation to at least one criterion that indicates the presence of an operating condition of a smoke detector that is suitable for influencing a functionality of the smoke detector, wherein the at least one operating condition influences the light-guiding behavior of at least one of the first and second light guides.
  • the method also includes, if the evaluation shows that the at least one criterion is met, controlling at least one device function of the smoke detector, which is related to the existence of the operating condition and/or the influenced functionality of the smoke detector, and/or outputting an indication signal indicates the existence of the operating condition and/or the affected functionality of the smoke detector.
  • the reliability and accuracy of an evaluation result with regard to the at least one operating condition can be improved.
  • Providing the first and second light guides also allows distinction between different operating conditions of the smoke detector.
  • the smoke detector can include the at least one sensor device, the first light guide, the second light guide and/or the processing device.
  • the at least one signal property can be determined using the sensor device and/or the processing device.
  • the indication signal can be output by means of the processing device.
  • the first light guide and the second light guide can be arranged outside a smoke chamber of the smoke detector.
  • the first light guide and the second light guide can be at least partially uncovered or transparently covered.
  • At least one of the first light guide and the second light guide can be curved in a plane of the smoke detector.
  • the second light guide can be curved in the plane of the smoke detector and at least partially surround the first light guide with respect to the plane. Additionally or alternatively, the second light guide can be curved in the plane of the smoke detector and at least partially form or surround a boundary of the smoke detector.
  • possible operating conditions of the smoke detector that act on the smoke detector from a lateral direction, in particular lateral impacts, lateral application of paint or adhesive objects and / or an influx of chemical substances from a lateral direction, can also affect at least one of the first and the second Light guides act. This promotes determining such operating conditions based on the detected first and second optical signals.
  • the first light guide and the second light guide may be different with respect to a light guide material, a coating, a light guide geometry and/or an arrangement relative to a boundary, a housing and/or a smoke chamber of the smoke detector.
  • a light guide material a coating, a light guide geometry and/or an arrangement relative to a boundary, a housing and/or a smoke chamber of the smoke detector.
  • different possible operating conditions of the smoke detector can influence the light conduction behavior of the first light guide and the second light guide differently. This facilitates a distinction between the various possible operating conditions based on the detected first and second optical signals.
  • the first optical signal and the second optical signal can be generated by at least one light source of the smoke detector.
  • the signal property can include an intensity of the respective optical signal. Included The at least one criterion can include exceeding or falling below a threshold difference between an intensity of the first optical signal and an intensity of the second optical signal. The at least one signal property can in particular include a maximum or an average light intensity of the respective optical signal in at least one light wavelength range.
  • the at least one criterion can be variable over time according to a predetermined rule.
  • the at least one operating condition can influence the light-guiding behavior of at least one of the first and second light guides at least partially by influencing a transmission rate in at least one region of a lateral surface of the respective light guide.
  • a processing device includes at least one processor unit, and at least one memory device operatively connected to the processor unit and containing portions of program code that, when executed by means of the processor unit, configures the processing device to perform the following steps: Receive, from at least one Sensor device, at least a first sensor signal indicative of a first optical signal detected by the sensor device, and a second sensor signal indicative of a second optical signal detected by the sensor device, and determining at least one signal characteristic of each of the first optical signal and the second optical signal, or receiving, from the at least one sensor device, at least one first sensor signal, which indicates at least one signal property of the first optical signal detected by the sensor device, and a second sensor signal, which indicates at least one Signal property of the second optical signal, which is detected by means of the sensor device, indicates, wherein the first optical signal is transmitted by means of a first light guide and the second optical signal is transmitted by means of a second light guide, and the signal property in each case refers to a light conduction behavior of the first
  • a system for operating a smoke detector comprises a processing device of the type presented here.
  • the system also comprises at least one light source which is designed to generate at least a first optical signal and a second optical signal, at least one first light guide which is designed to generate the first optical signal to transmit, and a second light guide which is designed to transmit the second optical signal, and at least one sensor device which is operatively connected to the processing device and which is designed to detect the first optical signal and the second optical signal.
  • a smoke detector comprises a processing device of the type presented here.
  • the smoke detector also comprises at least one light source which is designed to generate at least a first optical signal and a second optical signal, at least one first light guide which is designed to generate the first optical signal to transmit, and a second light guide which is designed to transmit the second optical signal, and at least one sensor device which is operatively connected to the processing device and which is designed to detect the first optical signal and the second optical signal.
  • Fig. 1 shows schematically and by way of example a system 100 for operating a smoke detector 190.
  • the system 100 comprises a first light guide 112 and a second light guide 114, each of which is arranged outside a smoke chamber 192 of the smoke detector 190.
  • the smoke detector 190 is part of the system 100. As shown by the dashed lines in Fig. 1 indicated, is in other versions of the system 100 the Smoke detector 190 is not part of the system 100.
  • the system 100 is in operational connection with the smoke detector 190, for example. In some implementations in which the system 100 is formed separately from the smoke detector 190, the system 100 is not directly connected to the smoke detector 190.
  • the system 100 is designed, for example, to communicate with a signaling center (not shown), which also receives signals from the smoke detector 190 and evaluates them depending on signals from the system 100.
  • the system 100 includes a light source 120.
  • the light source 120 is arranged so that an optical signal generated by the light source 120 can be coupled into the first light guide 112 and into the second light guide 114.
  • the system 100 also includes a sensor device 124.
  • the sensor device 124 is designed to detect optical signals that are generated by the light source 120 and coupled into the first light guide 112 or the second light guide 114 after passing through the respective first light guide 112 or second light guide 114 to capture.
  • the sensor device 124 includes a first sensor 126 assigned to the first light guide 112 and a second sensor 128 assigned to the second light guide 114.
  • the sensor device 124 comprises a common sensor for the first and second light guides 112, 114.
  • a common sensor for the first and second light guides 112, 114.
  • means are provided, for example, to selectively separate optical signals in time only to be coupled into one of the first and second light guides 112, 114.
  • the common light source 120 for example, an independently controllable light source is provided for each of the light guides 112, 114.
  • the system 100 also includes a processing device 130.
  • the processing device 130 includes a processor unit 140 and a memory device 150 operatively connected to the processor unit 140.
  • the processing device 130 is connected to the light source 120 and the sensor device 124 via interfaces 132, 134.
  • the processing device 130 also includes a communication module 160 that is operatively connected to the processor unit 140.
  • the communication module 160 is used, for example, to transmit signals, by radio or via a line, to a signaling center.
  • the smoke detector 190 includes a smoke chamber 192 into which ambient air can enter through a smoke inlet opening 194.
  • a smoke sensor 196 of the smoke detector 190 is arranged in the smoke chamber 192.
  • the smoke sensor 196 is operative with a control unit 198 of the smoke detector 190 connected.
  • the smoke sensor 196 is designed to detect the presence of smoke in the smoke chamber 192. The detection takes place, for example, optically.
  • the smoke sensor 196 is also designed to output a signal to the control unit 198, which indicates a detected presence of smoke in the smoke chamber 192.
  • the control unit 198 evaluates the signal received from the smoke sensor 196 in relation to a triggering criterion, for example a threshold concentration of smoke in the smoke chamber 192, and generates a smoke detector signal depending on the evaluation result.
  • the system 100 is primarily intended to allow conclusions to be drawn about possible clogging of the smoke inlet opening 194 as a result of deposits from the ambient air, for example steam, dust or grease mist.
  • at least one of the first and second light guides 112, 114 is designed so that deposits from the ambient air, which can clog the smoke inlet opening 194, also occur on the corresponding first or second light guide 112, 114 and a light conduction behavior of the light guide in question 112, 114 influence.
  • the light guide 112, 114 in question is, for example, unclad, i.e. without an opaque casing, and is arranged at least in sections outside a housing of the smoke detector 190 or in an open area of a housing of the smoke detector 190.
  • Deposits for example due to steam, dust or grease mist in the ambient air, which occur on a surface of the relevant light guide 112, 114, typically have a higher refractive index than smoke-free air. These deposits thus reduce the reflection rate of the light that hits the surface from within the respective light guide. This leads to an increased decoupling of light from the light guide, which is no longer detected at an output end of the light guide by means of the sensor device 124.
  • the system 100 thus allows the determination of a light guiding behavior by detecting a light intensity at an output end of the respective light guide 112, 114 by means of the sensor device 124 and by evaluating the detected light intensity in relation to a light intensity coupled into the respective light guide 112, 114 by means of the light source 120 , including possible impairments in the light conduction behavior, for the light guide 112, 114 in question. Based on the specific light conduction behavior, it is possible to conclude that there are deposits on the surface of the light guide and thus corresponding deposits in the area of the smoke inlet opening 194 of the smoke detector 190.
  • the first and second light guides 112, 114 are curved.
  • a non-straight geometry of the light guides 112, 114 causes the frequency of light reflection on the outer surface of the respective light guide and thus the influence of light reflection on the light guide in the light guide is increased.
  • An increased outcoupling of light from the light guide due to deposits on the outside of the light guide is thus easier to measure.
  • the first and second light guides 112, 114 also surround the smoke detector 190 in one plane of the smoke detector 190. This ensures that deposits that primarily reach the smoke detector 190 from a certain direction do not pass through a housing of the smoke detector 190 are shielded by the first and second light guides 112, 114.
  • the first and second light guides 112, 114 are equally designed to determine a light guiding behavior of the first and second light guides 112, 114, respectively.
  • an optical signal generated by means of the light source 120 is coupled equally into the first light guide 112 and into the second light guide 114 and its intensity is detected after passing through the respective light guide using the sensor device 124.
  • the intensity recorded in each case is evaluated by means of the processor unit 140 of the processing device 130 in relation to an operating condition of the smoke detector 190.
  • An operating condition of the smoke detector 190 corresponds, for example, to a quantity of deposits from the ambient air of the smoke detector 190. If, for example, the light conduction behavior of both the first and the second light guide 112, 114 indicates the same or similar level of impairment, the processing device 130 indicates Deposits from the ambient air on the light guide 112, 114 are considered to be the cause of the impairment.
  • the respective evaluation results based on the optical signal from the first and second light guides 112, 114 can be averaged to determine a deposit amount more reliably.
  • the processing device 130 can be used to infer a different or additional operating condition of the smoke detector.
  • Possible causes for a different impairment of the light-guiding behavior of the light guides 112, 114 are, for example, mechanical damage to one of the light guides 112, 114, mechanical and/or optical shadowing of one of the light guides 112, 114, for example due to paint or strips of adhesive tape adhering to the light guide in question, increased corrosion of one of the light guides 112, 114 due to chemical or climatic influences acting unequally on the light guides 112, 114, etc.
  • the criteria include, for example, a difference between an impairment of the light-guiding behavior of the first and second light guides 112, 114 compared to a standard value of the light-guiding behavior of the respective light guide 112, 114.
  • the criteria additionally or alternatively include a temporal change in the light-guiding behavior of the first or .Second light guide 112, 114 compared to a previously determined light guide behavior of the relevant first or second light guide 112, 114.
  • the temporal change is determined, for example, using a comparison with logged data of a light guide behavior of the first and second light guide 112, 114 from previous measurements or evaluations of the system 100.
  • the evaluation by means of the processing device 130 is carried out with regard to whether the determined operating condition of the smoke detector 190 is suitable for impairing the functionality of the smoke detector 190.
  • Does the evaluated light conduction behavior of the first and second light guides 112, 114 indicate, for example, uniform deposits from the ambient air in the area of the smoke detector 190 and the deposits have an extent that corresponds to clogging of the smoke inlet opening 194 to an extent at which functionality is possible of the smoke detector 190 is not guaranteed
  • the processing device 130 for example, outputs an advisory signal to a signaling center using the communication module 160.
  • the warning signal serves, for example, to indicate that the smoke detector 190 requires maintenance.
  • the processing device 130 the output of a control signal via an interface 136 to the control unit 198 of the smoke detector 190.
  • the control signal causes, for example, that a triggering threshold of the smoke detector 190 is lowered in order to avoid a delayed output of a smoke detector signal as a result of a delayed entry of the ambient air into the smoke chamber in the event of a fire .
  • an indication signal is output as standard to a reporting center by means of the processing device 130.
  • the information signal serves, for example, to indicate that conclusions about clogging of the smoke inlet opening 194 can be made based on the light conduction behavior of the smoke detector 190 first and second light guides 112, 114 are currently not possible with sufficient reliability and therefore, for example, there is a need for maintenance of the smoke detector 190 or the system 100.
  • the provision of the first light guide 112 and the second light guide 114 allows improved reliability in the evaluation of a determined signal characteristic of an optical signal transmitted through the first and second light guides 112, 114, respectively to an assumed operating condition of the smoke detector 190.
  • the provision of the first light guide 112 and the second light guide 114 also allows an improved distinction between various possible operating conditions of the smoke detector 190, at least to the extent that such an operating condition relates to a light guiding behavior of at least one of the first and second light guides 112, 114 impacts.
  • the possibility of plausibility of an evaluation result of the light-guiding behavior of the first and second light guides 112, 114 with respect to an operating condition is further favored by the fact that signals from the sensor device 124 and/or evaluation results from the processing device 130 are stored in a storage device 150 the processing device 130 are logged.
  • This allows the signal properties of optical signals to be evaluated additionally in relation to a change over time, for example a change over time in the light conduction behavior of each of the first and second light guides 112, 114.
  • This allows continuous processes, such as continuous deposition of particles from the ambient air, to be carried out acute events, such as mechanical damage to one of the light guides 112, 114 or a covering of one of the light guides 112, 114 as a result of manipulation.
  • the possibility of plausibility and distinguishing between different possible operating conditions of the smoke detector 190 is further facilitated by the fact that the first and second light guides 112, 114 have different geometries and/or different materials that have different light conduction properties or have different corrosion resistance , etc., include.
  • This is in Fig. 1 indicated by different hatching of the first and second light guides 112, 114.
  • Different operating conditions for example, have different effects on the light conduction behavior of the first and second light guides 112, 114.
  • such operating conditions can be distinguished based on the light conduction behavior of the first and second light guides 112, 114 and a device function of the smoke detector 190 can be appropriately controlled or an information signal can be appropriately output in accordance with the respective operating condition.
  • the smoke detector 190 is formed separately from the system 100 in some examples. In other examples, however, the smoke detector 190 also includes some or all of the features of the system 100 described above. In examples in which the smoke detector 190 includes some of the aforementioned features of the system 100, the smoke detector is in operational connection with the system 100, for example, to operate these features remaining components of the system 100 that are not included in the smoke detector 190. In particular, in some examples, the smoke detector 190 includes the first and second light guides 112, 114, which are attached, for example, to a housing of the smoke detector 190 to form a lateral boundary of the smoke detector 190.
  • Fig. 2 shows a flowchart of a method 200 for operating a smoke detector.
  • the method 200 is by means of a system 100, as related to Fig. 1 described, and for operating a smoke detector, such as the smoke detector 190 in Fig. 1 , feasible.
  • the smoke detector is part of the system.
  • the method 200 is performed using a system for operating a smoke detector, where the smoke detector itself is not part of the system, as in connection with Fig. 1 described.
  • the method 200 includes detecting at least one first optical signal and at least one second optical signal by means of at least one sensor device.
  • the first optical signal is transmitted by means of a first light guide and the second optical signal by means of a second light guide, step 210.
  • the method 200 also includes determining at least one signal property of each of the first optical signal and the second optical signal.
  • the signal property indicates the light conduction behavior of the first and second light guides, step 220.
  • the method 200 further includes evaluating the signal properties of the first optical signal and the second optical signal with respect to at least one criterion.
  • the criterion indicates the existence of an operating condition of the relevant smoke detector that is suitable for influencing the functionality of the smoke detector.
  • the at least one operating condition simultaneously influences the light-guiding behavior of at least one of the first and second light guides, step 230.
  • At least one device function of the smoke detector is controlled in accordance with the method 200 in a subsequent step 240 in some examples.
  • the device function is related to the existence of the operating condition and/or the influenced functionality of the smoke detector, Substep 242.
  • Controlling a device function of the smoke detector 190 takes place, for example, in implementations in which the processing device 130 is operationally connected directly to a control unit 198 of the smoke detector 190 via the interface 136.
  • an indication signal is output which indicates the existence of the operating condition and/or the influenced functionality of the smoke detector, sub-step 244.
  • the information signal is output via a communication module 160 of the processing device 130, by radio or via a line, for example to a reporting center.
  • both substeps 242, 244 are carried out. In other examples of the method 200, only one of the sub-steps 242, 244 is carried out in connection with step 240.
  • Fig. 3 shows schematically and by way of example a smoke detector 300.
  • the smoke detector 300 comprises a smoke chamber 392, which is arranged in a housing of the smoke detector 300 and can enter the ambient air through a smoke inlet opening 394 of the smoke detector 300.
  • a smoke sensor 396 is arranged in the smoke chamber 392. This applies to the functionality of these features of the smoke detector 300 in connection with the smoke detector 190 in Fig. 1 Described accordingly.
  • the smoke detector 300 also includes a first light guide 312 and a second light guide 314, each of which is arranged outside the smoke chamber 392.
  • An optical signal can be coupled into each of the first and second light guides 312, 314 by means of at least one light source 320, 322.
  • An optical signal, which is transmitted by means of the first or second light guide 312, 314, can be detected by means of a sensor device 324.
  • Sensor signals from the sensor device 324 are output to a processing device 330. This also applies in connection with the functioning of the first light guide 312, the second light guide 314, the at least one light source 320, 322, the sensor device 324 and the processing device 330 Fig. 1 Described accordingly, as far as possible Fig. 3 and the following description does not indicate anything different.
  • the aforementioned features are components of the smoke detector 300.
  • the processing device 330 also serves as a control unit of the smoke detector 300, similar to the control unit 198 of the smoke detector 190 in Fig. 1 .
  • each of the first smoke detector 312 and the second smoke detector 314 is assigned a light source 320, 322, which can be controlled independently of one another by means of the processing device 330.
  • Smoke detector 300 has a common sensor device 324 provided for both the first light guide 312 and the second light guide 314.
  • a distinction between an optical signal that is transmitted through the first light guide 312 and an optical signal that is transmitted through the second light guide 314 is done, for example, by means of different sensor areas of the sensor device 324.
  • the signals are differentiated through time separate control of the light sources 320, 322.
  • the smoke detector 300 turns off compared to the system 100 Fig. 1 represents a completely integrated implementation. All functionalities of the system 100 are integrated in the smoke detector 300.
  • the signal properties of the optical signals transmitted through the first and second light guides 312, 314 are evaluated and a device function of the smoke detector 300 is subsequently controlled and implemented, all within the processing device 330.
  • this includes, similar to the example of Fig. 1 , a common light source for the first and second light guides 312, 314.
  • the signals are differentiated, for example, on the sensor side, for example by means of different sensors that are assigned to the first and second light guides 312, 314.
  • a distinction between optical signals transmitted through the first and second light guides 312, 314 and detected by sensors is made in a different way, for example by using suitable color filters.

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  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fire-Detection Mechanisms (AREA)
EP22196274.9A 2022-09-19 2022-09-19 Dispositif et procédé de fonctionnement d'un détecteur de fumée Active EP4339914B1 (fr)

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EP4339914A1 true EP4339914A1 (fr) 2024-03-20
EP4339914B1 EP4339914B1 (fr) 2025-07-16
EP4339914C0 EP4339914C0 (fr) 2025-07-16

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN120748115A (zh) * 2025-09-01 2025-10-03 深圳市安室智能有限公司 火灾警报系统的防误报方法及相关装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1870866A1 (fr) * 2006-06-24 2007-12-26 Brunata Wärmemesser Hagen GmbH & Co. KG Détecteur de fumée
EP3113133A2 (fr) * 2015-06-29 2017-01-04 Atral-Secal GmbH Detecteur de fumee dote d'un dispositif combine de detection de particule et de recouvrement de l'orifice d'entree de fumee

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1870866A1 (fr) * 2006-06-24 2007-12-26 Brunata Wärmemesser Hagen GmbH & Co. KG Détecteur de fumée
EP3113133A2 (fr) * 2015-06-29 2017-01-04 Atral-Secal GmbH Detecteur de fumee dote d'un dispositif combine de detection de particule et de recouvrement de l'orifice d'entree de fumee

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN120748115A (zh) * 2025-09-01 2025-10-03 深圳市安室智能有限公司 火灾警报系统的防误报方法及相关装置

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