EP2093733B1 - Détection de fumée à l'aide de deux mesures à lumière diffusée spectrales différentes - Google Patents

Détection de fumée à l'aide de deux mesures à lumière diffusée spectrales différentes Download PDF

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Publication number
EP2093733B1
EP2093733B1 EP08101742A EP08101742A EP2093733B1 EP 2093733 B1 EP2093733 B1 EP 2093733B1 EP 08101742 A EP08101742 A EP 08101742A EP 08101742 A EP08101742 A EP 08101742A EP 2093733 B1 EP2093733 B1 EP 2093733B1
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EP
European Patent Office
Prior art keywords
light
output signal
scattered
scattered light
smoke
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Revoked
Application number
EP08101742A
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German (de)
English (en)
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EP2093733A1 (fr
Inventor
Kurt Dr. Müller
Markus Loepfe
Georges A. Dr. Tenchio
Walter Vollenweider
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Siemens Schweiz AG
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Siemens AG
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Application filed by Siemens AG filed Critical Siemens AG
Priority to AT08101742T priority Critical patent/ATE507544T1/de
Priority to DE502008003347T priority patent/DE502008003347D1/de
Priority to EP08101742A priority patent/EP2093733B1/fr
Priority to PCT/EP2009/051756 priority patent/WO2009103668A1/fr
Priority to US12/735,846 priority patent/US20110037971A1/en
Priority to CN200980105644.4A priority patent/CN101952863B/zh
Publication of EP2093733A1 publication Critical patent/EP2093733A1/fr
Publication of EP2093733B1 publication Critical patent/EP2093733B1/fr
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Anticipated expiration legal-status Critical

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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
    • G08B29/02—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 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 present invention relates to the technical field of danger detection technology. More particularly, the present invention relates to an apparatus for discriminating between detection of smoke and detection of insects based on scattered light optical measurements. The present invention further relates to a corresponding method based on the principle of optical scattered light measurements.
  • Optical or photoelectric smoke detectors usually work according to the scattered light method. It is exploited that clear air reflects virtually no light. However, if smoke particles are in the air, an illumination light emitted by a light source is at least partially scattered on the smoke particles. Part of this scattered light then falls on a light receiver, which is not directly illuminated by the light beam. Without smoke particles in the air, the illumination light can not reach the photosensitive sensor.
  • a fire detector is known, which is based on the known scattered radiation principle.
  • the fire detector has a plurality of radiation transmitters and a plurality of radiation receivers whose radiation paths define a plurality of spaced-apart scattering volumes or detection spaces.
  • the detection spaces are spatially spaced such that small objects such as insects can not move through multiple detection spaces simultaneously. In this way, a distinction can be made between a light scattered by a small object to be measured and a case of fire, in which smoke a distinction is made between smoke distributed over all detection spaces.
  • the fire detector has the disadvantage that it has several independent light paths each having both a light transmitter and a light receiver. The equipment required for the fire alarm is thus relatively high.
  • the smoke detector has a sensor housing with two light transmitters received therein, which emit light of different wavelengths and which are aligned with a smoke detection space located outside the sensor housing. It is recorded in the sensor housing, a light receiver for detecting scattered light, which comes from the illuminated by the light emitter smoke detection room. The light receiver outputs in each case a signal corresponding to the received light quantity.
  • the fire detector also has an evaluation unit which, from the intensity ratio of the two signals, makes it possible to distinguish the smoke into light smoke and dark smoke.
  • a smoke detector according to the backscatter principle which determines the presence of a non-fire case from the ratio of the received backscatter signals of two different wavelengths by means of an evaluation unit when the ratio of the two-wavelength signals is less than 2.
  • a fire detector which has a laser light source.
  • the laser light source is set up to emit short laser pulses in a surveillance area.
  • the fire detector also has a light detector which is arranged next to the laser light source and which is set up to detect laser light scattered back by 180 ° from smoke or other objects located in the monitoring area. Based on the time difference between emitted and received laser pulses, the position of a backscatter object within the Be determined monitoring area. By a suitable comparison with time differences obtained by reference measurements, the type of detected smoke can also be detected. In particular, a distinction can be made between black and white smoke.
  • the fire detector described has the disadvantage that the cost of measuring and evaluating the time difference is relatively high.
  • a smoke detector which comprises a housing and disposed within the housing has a light emitter and a light receiver. A defined by the spatial arrangement of light emitter and light receiver smoke detection area is located outside the smoke detector.
  • the smoke detector described has the disadvantage that in the smoke detection area penetrating insects can distort the detection of smoke.
  • the invention is based on the device-related object to provide a simply constructed open scattered light smoke detector, which is characterized on the one hand by a high reliability in the detection of smoke and on the other by a low false alarm probability in insects located in the detection room.
  • the invention is based on the method-related object to provide a method for detecting smoke on the basis of optical scattered light measurements, which is also characterized by a high reliability in the detection of smoke and on the other hand by a low false alarm probability in insects located in the detection room.
  • an apparatus for detecting smoke based on scattered light optical measurements has (a) a light emitting device configured to emit a temporal sequence of light pulses, wherein a first light pulse has a first spectral distribution and a second light pulse has a second spectral distribution that is different from the first spectral distribution (b ) a light receiver configured to receive a first scattered light from the first light pulse and a second scattered light from the second light pulse, and to provide a first output indicative of the first stray light and a second output indicative of the second stray light , and (c) an evaluation unit configured to compare the first output signal with the second output signal and to determine an insect presence index if the two output signals of great and approximately equal amplitude vary in time.
  • the described device for detecting smoke which is also referred to below as a scattered light smoke detector, is based on the finding that different light scatterers, which may be within the detection range of the scattered light detector, can be discriminated from one another by comparing their optical scattering properties at different wavelengths become.
  • the light receiver is preferably arranged spatially relative to the light-emitting device such that the primary illumination light emitted by the light-emitting device does not strike the light receiver. This applies to both the first and the second light pulses. Thus, in the absence of any light scatterers in the detection range of the scattered light smoke detector, no light rays reach the light receiver.
  • the described scattered light smoke detector may in particular be an open smoke detector. This means that a spatially separated scatter chamber, which is often referred to as a labyrinth, is not required.
  • Such other light scatterers may in particular be insects which may have entered the detection range of the scattered light smoke detector.
  • such light scatterers may also be typically stationary objects such as ground, wall or even side surfaces of a space monitored by the described scattered light smoke detector.
  • the two output signals are each indicative of the respective scattered light.
  • the output signals may preferably be directly proportional to the respective scattered light intensity. This means that the light receiver and the evaluation unit connected downstream of the light receiver operate linearly. A doubling of the scattered light intensity will then lead to an increase of the respective output signal by a factor of two.
  • the evaluation unit is set up to form a difference between the first output signal and the second output signal.
  • the signal evaluation depending on the difference between the two output signals is particularly advantageous if this object is relatively far away from the light emitting device and / or the light receiver.
  • the signal amplitudes can both be very large. However, whether they are in fact exactly the same size, so that the difference between two relatively large signals results in a zero signal, however, is unlikely in practice.
  • a difference signal remains which, with regard to its signal strength, corresponds at least to the order of magnitude of a smoke difference signal.
  • the difference formation described is particularly suitable for a highly accurate scattered light measurement of smoke or on a relatively widely spaced from the scattered light smoke detector object, when the two light paths of the first light pulse and the second light pulses are aligned with respect to the resulting output signals.
  • the intensity of the two light pulses can be set so that the two output signals are equal in a light scattering of the two light pulses on a Referenzstreucons.
  • the reference object may be, for example, a simple black scattering object which is introduced into the measuring range of the scattered light smoke detector during the adjustment.
  • N is typically in the range between 4 and 6.
  • the evaluation unit is set up to determine the ratio of the amplitude of the first output signal to the amplitude of the second output signal.
  • the determination of the described amplitude ratio can also be based on the two previously determined amplitudes of the first output signal and the second output signal.
  • the evaluation of the amplitude ratio has the advantage that it is always independent of the distance of the object from the scattered light detector for solid objects with a weak wavelength dependence of the scatter signal Signal ratio of approximately equal to one.
  • the signal ratio for a solid object regardless of its distance from the scattered light smoke detector differs significantly from the signal ratio of smoke.
  • the following relationship (2) results for the ratio of the amplitudes or the intensities of two scattered light signals: I ⁇ ⁇ 1 / I ⁇ ⁇ 2 ⁇ ⁇ ⁇ 2 / ⁇ ⁇ 1 n
  • n is typically in the range between 4 and 6.
  • the light-emitting device and the light receiver are arranged directly next to one another.
  • optoelectronic components for the light emitting device and the light receiver of the scattered light smoke detector can be realized for example with a maximum linear extent of about 7 mm.
  • the described scattered light smoke detector can additionally be realized within a small height extent.
  • the scattered light smoke detector can therefore be an inconspicuous object, which is suitable for many applications. Both space and aesthetic requirements can be met in a simple manner.
  • the light-emitting device has a first light source and a second light source.
  • the two light sources may be, for example, two light-emitting diodes, which are preferably arranged directly next to each other.
  • the two light sources can also be realized by means of a so-called. Multichip LED, which has at least two elements emitting light in different spectral ranges. In this case, the two light-emitting elements are anyway arranged in close proximity to each other.
  • the smallest possible distance between the two light sources has the advantage that the spatial signal paths for both light pulses are approximately equal.
  • the scattering on an insect continues to result in two signals having at least approximately the same amplitude, which, given a separate signal detection and a subsequent amplitude comparison, provide an amplitude ratio of at least approximately one. This is true at least as long as the time difference between the two light pulses is significantly smaller than the typical time scale of movements of insects.
  • the light-emitting device can also be realized by means of a light-emitting element, from which both light pulses emerge.
  • the Light-emitting element may be, for example, the end of an optical waveguide whose other end is split into two dividing ends. One divider may then be optically coupled to the first pulsed light source, the other divisor may be optically coupled to the second pulsed light source.
  • the device additionally has a microcontroller which is coupled at least to the light-emitting device and to the evaluation unit and which is set up for temporally synchronizing at least the light-emitting device and the evaluation unit.
  • the microcontroller and the evaluation unit can also be realized within an integrated component.
  • the evaluation unit can be controlled by software, by means of one or more special electrical circuits, i. in hardware or in any hybrid form, i. using software components and hardware components.
  • the first light pulse lies in the near infrared spectral range and / or the second light pulse is in the visible spectral range, in particular in the blue or violet spectral range.
  • a light emitting diode in the near infrared spectral range can provide the corresponding light pulses with a high intensity. This is all the more true since the two optoelectronic components can each be subjected to a current intensity which is higher is the current that would result in a stationary energization to a thermal destruction of the respective light emitting diode. Between two consecutive light pulses of the same type, the respective light-emitting diode can namely at least cool somewhat.
  • the first light pulse may have, for example, a wavelength of 880 nm (near infrared spectral range).
  • the second light pulse may, for example, have a wavelength of 420 nm (blue region of the visible spectrum).
  • the first and / or the second light pulse has a time length in the range between 1 ⁇ s and 200 ⁇ s, in the range between 10 ⁇ s and 150 ⁇ s or in the range between 50 ⁇ s and 120 ⁇ s. Particularly preferred currently appears a pulse length of 100 microseconds for both light pulses.
  • the repetition rate can result from the sum of the time lengths of the individual light pulses.
  • a rest pause follow, so that the effective repetition rate is significantly smaller than the inverted sum of the individual pulse durations.
  • Such a rest period can serve, for example, to reduce the effective power consumption of the described scattered light smoke detector. This is particularly advantageous in a battery-powered or battery-powered device, as this can significantly extend the life of the battery or the battery.
  • the present invention is by no means limited to the use of two types of light pulses. Rather, three or even more than three spectrally different light pulses of a given sequence can be evaluated in a suitable manner. This can the accuracy in the spectral discrimination of different scattering objects can be further improved.
  • the number of first light pulses and the number of second light pulses within a basic cycle need not necessarily be the same.
  • the first light pulse is significantly more intense than the second light pulse.
  • the adjustment described above can also take place in that the ratio between the number of first light pulses and the number of second light pulses is not equal to one and that the respective output signals of the two light pulses are integrated within a basic cycle. By a suitable choice of this ratio, an adjustment can then take place between the corresponding integrated output signals of the different light pulses.
  • the device additionally has an insect displacement device which is coupled to the evaluation unit and which can be activated in the case of temporally strong fluctuations of the first output signal and / or of the second output signal.
  • the insect eviscerating device may, for example, be a small "Ultra Sonic Mosquito Repeller" which, by means of an ultrasound sound that is very unpleasant for insects, sells the insects which are currently crawling over the light emitting device and / or via the light receiver and thereby causing strong fluctuations of the first output signal and / or cause the second output signal.
  • a method of detecting smoke based on scattered light optical measurements may in particular comprise a device of the above type.
  • the specified method comprises (a) transmitting a temporal sequence of light pulses by means of a light emitting device, wherein a first light pulse has a first spectral distribution and a second light pulse has a second spectral distribution that is different from the first spectral distribution, (b) receiving a first scattered light from the first light pulse and a second scattered light from the second light pulse by means of a first light pulse (C) providing a first output signal indicative of the first stray light and a second output indicative of the second stray light (d) comparing the first output signal with the second output signal by means of an evaluation unit; e) determining an insect presence index if the two output signals of large and approximately equal amplitude change with time.
  • the stated method for detecting smoke is also based on the knowledge that different light scatterers, which may be located in the detection range of the scattered light detector, can be discriminated from one another by comparing their optical scattering properties at different wavelengths.
  • the method additionally comprises matching the intensities of the two light pulses, so that when a scattering of the two light pulses to a reference scattering object, the first output signal and the second output signal are the same size.
  • the reference object may be, for example, a simple black scattering object which is introduced into the measuring range of the scattered light smoke detector during the adjustment.
  • the above-described comparison of the first output signal with the second output signal comprises forming a difference between the first output signal and the second output signal.
  • a difference signal can be generated, which is particularly indicative of the presence of smoke in the detection range of the scattered light smoke detector. This is because, unlike stationary objects such as the walls or the floor of a monitored room or moving objects such as insects, the scattered light behavior of smoke is strongly wavelength dependent. In fact, in the presence of smoke, a particularly large change in the difference signal will occur. This applies in particular to the case where the two light paths of the first light pulse and of the second light pulse are adjusted with respect to the resulting output signals, so that a difference signal of at least approximately zero normally results.
  • a time-varying difference signal is therefore a sure sign of the presence of insects.
  • the method additionally comprises compensating for a slowly varying difference signal towards a zero signal.
  • a difference signal which is based on a slowly varying first output signal and / or second output signal, be tracked so that in the absence of smoke, the difference signal is at least approximately equal to zero. The presence of smoke can then be reliably detected, starting from a zero signal by a difference signal, which differs significantly from the usual zero signal.
  • Different output signals can be caused for example by a slightly wavelength-dependent attenuation of reflected at the bottom or on the side walls of a space to be monitored light pulses.
  • Different output signals can also be caused by a time-varying and wavelength-dependent scattering behavior of the floor or the side walls.
  • these effects typically occur on a very slow time scale such that they can be reliably distinguished, for example, by appropriately filtering the difference signal from a highly variable difference signal produced by the presence of smoke.
  • FIG. 1 shows a top view of a scattered light smoke detector 100.
  • the scattered light smoke detector 100 has an in FIG. 1 not shown, on which all electronic and optoelectronic components of the scattered light smoke detector 100 are mounted.
  • the scattered-light smoke detector 100 has a light-emitting device 110, which comprises two light sources, a first light-emitting diode 111 and a second light-emitting diode 112.
  • the first light-emitting diode 111 has a light-emitting chip 111a.
  • the chip 111a emits an infrared light having a wavelength of 880 nm.
  • the second light-emitting diode 112 has a light-emitting chip 112a.
  • the chip 112a emits a blue light with a wavelength of 420 nm.
  • the two light-emitting diodes 111 and 112 are operated in a pulsed mode, with each light-emitting diode 111, 112 emitting light pulses with a time length of, for example, 100 ⁇ s.
  • the pulsed operation of the two light-emitting diodes 111 and 112 is synchronized with each other so that the two light pulses are fired or activated at a very small time interval. According to the exemplary embodiment illustrated here, this time interval between an infrared light pulse and a blue light pulse is approximately 1 to 100 ⁇ s.
  • the described scattered light smoke detector 100 is an open smoke detector.
  • the smoke detector 100 thus has no separated from the environment scattering chamber.
  • the smoke detection is rather on smoke particles that are in FIG. 1 located above the drawing plane.
  • at least part of the illumination light pulsed by the two light-emitting diodes 111, 112 is scattered at the aerosols of the smoke, and in turn a part of the scattered illumination light strikes the active surface 121 of a photodiode 120.
  • the two light-emitting diodes 111 and 112 are arranged directly next to the photodiode 120. This means that the housing of these components connect directly to each other or flush with each other. According to the embodiment shown here, the entire arrangement has a maximum linear extent of 7 mm.
  • the photodiode 120 sequentially measures a first optical scattered light signal in the near infrared spectral range and a second optical scattered light signal in the blue spectral range. By comparing the scattered light intensities of these two scattered light signals thus valuable information about the nature of the scattering object or the scattering medium can be obtained.
  • insects are not colored, but black, gray or brown to suppress the influence of insects in the scattering volume.
  • the luminous fluxes of the two light sources 111 and 111a and 112 or 112a are tuned in a balancing process so that the difference of the two measured signals generated by the photodiode offset in time from the radiation reflected by a black background is equal to zero.
  • the scattered light signals caused by the insects in the detection range can thus be effectively masked out.
  • the described scattered light smoke detector 100 can be realized in a miniaturized design.
  • FIG. 2 shows in a plan view of a scattered light smoke detector 200.
  • the scattered light smoke detector 200 differs from that in FIG. 1 shown scattered light smoke detector 100 only in that instead of two light emitting diodes, a so-called.
  • Multi-chip light-emitting diode 210 is used.
  • the multi-chip light-emitting diode 210 has a chip 211a emitting in the infrared spectral range and a chip 211b emitting in the blue spectral range.
  • the photodiode 220 is the same as the photodiode 120 of the scattered light smoke detector 100, and therefore will not be explained again.
  • the distance from the center of the photodiode 220 to the center of the multi-chip LED 210 is less than 4 mm.
  • FIG. 3 shows in a cross-sectional view the in FIG. 1 shown scattered light smoke detector, which is now provided with the reference numeral 300.
  • the scattered light smoke detector 300 has a housing 302. In the lower region of the housing 302, a groove-shaped recess is provided, which serves as a holder for a printed circuit board 305. On the circuit board 305 all electronic and optoelectronic components of the scattered light smoke detector 300 are mounted.
  • the circuit board is thus not only used as a carrier for in FIG. 3 not shown interconnects which electrically connect the individual components of the scattered light smoke detector 300 in a suitable manner.
  • the circuit board 3 ⁇ 5 thus also serves as a mechanical support for the components of the scattered light smoke detector 300th
  • circuit board 305 At the bottom of the circuit board 305 are formed as a dual-chip LED light emitting device 310 and the photodiode 320. Further, located at the bottom of the common circuit board 305 designed as a US Mosquito Repeller insect eviscerating device 350. This can always be activated when at According to the signal analysis described above, an insect is located directly on the light emitting diode 310 and / or the photodiode 320 or flying around in the vicinity of these two optoelectronic components.
  • a driver electronics 315 for driving the dual-chip LED 310 in a suitable manner.
  • a photo-amplifier 322 which is connected downstream of the photodiode 320, and an evaluation unit 330, which is the photo-amplifier 322 downstream.
  • a microcontroller 340 located at the top of the circuit board 305, which controls the entire operation of the scattered light smoke detector 300.
  • the microcontroller 340 and the evaluation unit 330 can also be designed as a common integrated component.

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Claims (13)

  1. Installation pour distinguer entre une détection de fumée et une détection d'insectes sur la base de mesures optiques de lumière diffusée, l'installation comprenant
    • un dispositif conçu pour émettre une succession dans le temps d'impulsions de lumière, une première impulsion de lumière ayant une première répartition spectrale et une deuxième impulsion de lumière ayant une deuxième répartition spectrale,
    • un récepteur ( 120, 220, 320 ) de lumière conçu pour recevoir une première lumière diffusée par la première impulsion de lumière et une deuxième lumière diffusée par la deuxième impulsion de lumière et pour mettre à disposition un premier signal de sortie, qui est une indication de la première lumière diffusée, et un deuxième signal de sortie, qui est une indication de la deuxième lumière diffusée, et
    • une unité ( 330 ) d'exploitation conçue pour comparer le premier signal de sortie au deuxième signal de sortie et pour déterminer un indice pour la présence d'insectes, si les deux signaux de sortie se modifient beaucoup dans le temps en ayant une amplitude grande et à peu près égale.
  2. Installation suivant la revendication 1, dans laquelle l'unité ( 330 ) d'exploitation est conçue pour former une différence entre le premier signal de sortie et le deuxième signal de sortie.
  3. Installation suivant l'une des revendications 1 à 2, dans laquelle
    l'unité ( 330 ) d'exploitation est conçue pour déterminer le rapport de l'amplitude du premier signal de sortie à l'amplitude du deuxième signal de sortie.
  4. Installation suivant l'une des revendications 1 à 3, dans laquelle
    le dispositif ( 110, 210, 310 ) d'émission de lumière et le récepteur ( 120, 220, 320 ) de lumière sont disposés immédiatement l'un à côté de l'autre.
  5. Installation suivant l'une des revendications 1 à 4, dans laquelle
    le dispositif ( 110, 210, 310 ) d'émission de lumière a une première source ( 11a, 211a ) et une deuxième source de lumière ( 112a, 112b ).
  6. Installation suivant l'une des revendications 1 à 5, comprenant, en outre
    un microdispositif ( 340 ) de commande, qui est couplé avec le dispositif ( 110, 210, 310 ) d'émission de lumière et avec l'unité ( 330 ) d'exploitation et qui est conçu pour synchroniser dans le temps au moins le dispositif ( 110, 210, 310 ) d'émission de lumière et l'unité ( 330 ) d'exploitation.
  7. Installation suivant l'une des revendications 1 à 6, dans laquelle
    la première impulsion de lumière se trouve dans le domaine spectrale de l'infrarouge proche et/ou la deuxième impulsion de lumière se trouve dans le domaine spectrale visible, notamment dans le domaine spectrale bleu et/ou violet.
  8. Installation suivant l'une des revendications 1 à 7, dans laquelle
    la première et/ou la deuxième impulsion de lumière a une longueur dans le temps comprise entre 1 µs et 200 µs, entre 10 µs et 150 µs ou entre 50 µs et 120 µs.
  9. Installation suivant l'une des revendications 1 à 8, comprenant, en outre
    un dispositif ( 350 ) pour chasser les insectes, qui est couplé à l'unité ( 330 ) d'exploitation et qui peut être activé lors de grandes fluctuations dans le temps du premier signal de sortie et/ou du deuxième signal de sortie.
  10. Procédé pour distinguer entre une détection de fumée et une détection d'insectes sur la base de mesures optiques de lumière diffusée en utilisant notamment une installation ( 100, 200, 300 ) suivant l'une des revendications 1 à 8, procédé dans lequel
    • on émet une succession dans le temps d'impulsions de lumière au moyen d'un dispositif ( 110, 210, 310 ) d'émission de lumière, une première impulsion de lumière ayant une première répartition spectrale et une deuxième impulsion de lumière ayant une deuxième répartition spectrale, qui est différente de la première répartition spectrale,
    • on reçoit une première lumière diffusée de la première impulsion de lumière et une deuxième lumière diffusée de la deuxième impulsion de lumière au moyen d'un récepteur ( 120, 220, 320 ) de lumière,
    • on met à disposition un premier signal de sortie, qui est une indication de la première lumière diffusée, et un deuxième signal de sortie, qui est une indication de la deuxième lumière diffusée,
    • on compare le premier signal de sortie au deuxième signal de sortie au moyen d'une unité ( 330 ) d'exploitation, et
    • on détermine un indice pour la présence d'insectes, si les deux signaux de sortie se modifient beaucoup dans le temps en ayant une amplitude grande et à peu près égale.
  11. Procédé suivant la revendication 10, dans lequel, en outre, on égalise les intensités des deux impulsions de lumière, de manière à ce que, lors d'une diffusion des deux impulsions de lumière sur un objet de diffusion de référence, le premier signal de sortie et le deuxième signal de sortie soient de même grandeur.
  12. Procédé suivant la revendication 11, dans lequel la comparaison du premier signal de sortie au deuxième signal de sortie comporte la formation d'une différence entre le premier signal de sortie et le deuxième signal de sortie.
  13. procédé suivant la revendication 10, comportant, en outre, la compensation d'un signal de différence se modifiant lentement vers un signal nul.
EP08101742A 2008-02-19 2008-02-19 Détection de fumée à l'aide de deux mesures à lumière diffusée spectrales différentes Revoked EP2093733B1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
AT08101742T ATE507544T1 (de) 2008-02-19 2008-02-19 Rauchdetektion mittels zweier spektral unterschiedlicher streulichtmessungen
DE502008003347T DE502008003347D1 (de) 2008-02-19 2008-02-19 Rauchdetektion mittels zweier spektral unterschiedlicher Streulichtmessungen
EP08101742A EP2093733B1 (fr) 2008-02-19 2008-02-19 Détection de fumée à l'aide de deux mesures à lumière diffusée spectrales différentes
US12/735,846 US20110037971A1 (en) 2008-02-19 2009-02-16 Smoke detection by way of two spectrally different scattered light measurements
PCT/EP2009/051756 WO2009103668A1 (fr) 2008-02-19 2009-02-16 Détection de fumée au moyen de deux mesures de lumière diffuse spectralement différentes
CN200980105644.4A CN101952863B (zh) 2008-02-19 2009-02-16 借助于两种光谱不同的散射光测量的烟雾探测

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EP08101742A EP2093733B1 (fr) 2008-02-19 2008-02-19 Détection de fumée à l'aide de deux mesures à lumière diffusée spectrales différentes

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EP2093733B1 true EP2093733B1 (fr) 2011-04-27

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WO2009103668A1 (fr) 2009-08-27
DE502008003347D1 (de) 2011-06-09
CN101952863A (zh) 2011-01-19
ATE507544T1 (de) 2011-05-15
EP2093733A1 (fr) 2009-08-26
CN101952863B (zh) 2020-04-24
US20110037971A1 (en) 2011-02-17

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