EP2492882B1 - Dispositif de détection d'obstacles masquant un détecteur de fumée - Google Patents
Dispositif de détection d'obstacles masquant un détecteur de fumée Download PDFInfo
- Publication number
- EP2492882B1 EP2492882B1 EP11305213.8A EP11305213A EP2492882B1 EP 2492882 B1 EP2492882 B1 EP 2492882B1 EP 11305213 A EP11305213 A EP 11305213A EP 2492882 B1 EP2492882 B1 EP 2492882B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- smoke detector
- reflective surface
- waves
- detecting obstacles
- transmitter
- 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.)
- Active
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Classifications
-
- 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
-
- 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
- G08B17/11—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
-
- 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
Definitions
- the present invention relates to a device and a method for detecting obstacles that may mask a smoke or gas detector, for example CO 2 , and operating by emission / reception of waves, particularly of the sonic or ultrasonic type.
- a smoke or gas detector for example CO 2
- emission / reception of waves particularly of the sonic or ultrasonic type.
- a smoke detector is a safety device that reacts to the presence of smoke or vapor in the air.
- a smoke detector is designed to trip when smoke arrives in a detector's detector chamber. It does not detect gas, heat or flames, but only fumes to warn as soon as possible of fires by triggering an integrated alarm.
- Photoelectric smoke detectors have the advantage of detecting smoldering fires, in other words fires that take a long time to declare themselves (mattresses, sofas, garbage cans, etc.). These slowly evolving fires are the most common (80% of cases) and the most dangerous.
- the light source sends a light beam through the detection chamber which, in normal times, is not directed towards the photocell.
- the light emitted by the source is reflected on the surface of said particles, thereby dispersing the incident beam, a portion of which is reflected towards the photocell, producing a current that triggers the alarm.
- the present invention overcomes this disadvantage by proposing an obstruction detection device close to the active part of a smoke or CO 2 detector, or in other words, an obstacle detection device capable of masking a detector of smoke or CO 2. smoke for example as described above.
- This device makes it possible to establish a map of the environment in which the smoke detector is located.
- other waves pass through the slots of the grid to reach the external environment of the detector then, or not encounter no obstacle, either ricochet on an obstacle (suspension, decoration, etc.) and are then also picked up by the receiver (s).
- the device first establishes initial mapping at time t 0 serving as reference or offset. It then periodically establishes a map at the instant t that it compares to the initial mapping, so as to identify a possible change in the environment of the smoke detector.
- This change consists in the appearance of obstacles, resulting in the modification of the shape of the wave picked up by the receiver (s). These obstacles can for example correspond to the dust accumulated around the detector and blocking the peripheral grid, or to the paint inadvertently projected on the detector and also blocking the grid in certain places, or to objects (lampshade, decoration ) added in the room at the detection zone.
- Any change in the environment of the smoke detector causes the activation of an alarm (visual or audible).
- the informed user can take any appropriate action, such as cleaning the smoke detector or moving the new objects so as not to mask the smoke detector.
- the obstacle detection area is a half-sphere with a radius of 1.5m around the smoke detector, which can be attached to the ceiling or a wall such as a wall light.
- the shape of the reflection surface In order to be able to detect obstacles in such a zone, many parameters intervene in practice, in particular the shape of the reflection surface, the relative positions of the various constituent elements of the device, the orientation of the surface of the box covered by the grid, etc. .
- the reflection surface can take different forms: a cone shape, a dome shape, or a multiple form. facets arranged to reflect the waves emitted 360 ° around the smoke detector.
- the reflection surface has a culminating shape towards the transmitter (s).
- the angle of inclination of the reflection surface is also a parameter on which it is possible to play in order to widen the detection zone.
- a single emitter is centered with respect to the central axis of symmetry of the reflection surface so that the transmitted waves cover the entire reflection surface.
- a single receiver may also be centered with respect to the central axis of symmetry of the reflection surface so as to capture the waves reflected by the reflection surface from obstacles present in the detection area.
- receivers may be distributed in the smoke detector housing and positioned relative to the reflection surface also to capture all the waves reflected by the reflection surface from obstacles in the detection zone.
- the transmitter (s) and the receiver (s) can be combined into one or more devices, reducing on the one hand the bulk in the housing of the smoke detector, and further facilitating their positioning relative to the reflection surface.
- a smoke detector (1) is attached to a ceiling (2).
- This smoke detector (1) is traditionally composed of a housing (3) to which is attached a peripheral grid (4), in this case located at its lower part.
- the housing (3) has a central axis of symmetry (X).
- a detection chamber (6) is in practice delimited by the housing (3).
- a light source assembly (7) / photoelectric cell detector (8) for example located in the upper part of the housing (3) is provided to detect if smoke enters the detection chamber (6).
- An ultrasonic transmitter / receiver (9) controlled by an electronic card (16) is also located in the upper part of the housing (3), more precisely centered on the central axis (X) of the housing (3), integrated in this last so as not to disturb the normal operation of the smoke detector (1).
- a reflective surface (10) having the shape of a cone rests in the lower part of the housing (3), also centered with respect to the central axis (X), pointing towards the transmitter / receiver (9).
- the peripheral grid (4) surrounds the reflection cone (10) substantially over its entire height.
- the transmitter / receiver (9) and the reflection cone (10) are in fact the obstacle detection device of the invention intended to prevent any masking of the smoke detector (1).
- the transmitter / receiver (9) emits ultrasonic waves towards the reflection cone (10), which thus reflects them in the air towards the peripheral grid (4).
- the distance between the emitter (9) and the cone (10) is calculated so that the emitted waves preferably cover the entire surface of the cone (10), and not only a part of it.
- the shape of the cone (10) itself as well as the angle of inclination of its wall make it possible to reflect the waves on a peripheral zone which is as large as possible under the casing (3) so as to widen as much as possible the zone of detection (11) of obstacles.
- a zone without detection (12) remains under the cone (10), the waves can not propagate through the reflection surface that it constitutes.
- the obstacle detection zone (11) has the appearance of a hemisphere surrounding the gate (4) of the detector (1) to which said non-detection zone (12) is subtracted.
- the transmitted waves When the transmitted waves encounter an obstacle, for example the grid (4), or any potentially troublesome object for the passage of fumes, they are reflected towards the reflection cone (10) then to the receiver (9). The wave finally makes a round trip between the transceiver (9) and the obstacle.
- an obstacle for example the grid (4), or any potentially troublesome object for the passage of fumes
- An obstacle detection control LED (13) and a smoke detection control LED (14) are placed on the outer face of the housing (3) so as to visually alert the user in case of masking. smoke detector (1) or in case of fire.
- the figure 2a consists of a graph illustrating the environment of the smoke detector under normal operating conditions.
- FIG. 1 it is a temporal acquisition diagram of the wave produced following the sending of an ultrasonic pulse.
- the shape of the signals appears on the diagram, temporally on the abscissa axis while the ordinate marks the measured amplitude in volts.
- the reflection due to the gate impacts the transmitted signal in a manner that is recorded as constituting the normal environment of the product.
- This first acquisition thus makes it possible to establish an initial mapping, called offset, at time t 0 , of the environment in which the smoke detector is located.
- the figure 2b representing a graph similar to the figure 2a , illustrates a map of the environment in which the smoke detector is located at a time t, in the presence of a flat obstacle which impacts the signal in return and modifies the initial signal.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Engineering & Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Fire-Detection Mechanisms (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| RS20140189A RS53300B (sr) | 2011-02-28 | 2011-02-28 | Uređaj za detektovanje prepreka koje mogu da zaklone detektor dima |
| DK11305213.8T DK2492882T3 (da) | 2011-02-28 | 2011-02-28 | Anordning til detektering af forhindringer, der tildækker en røgdetektor |
| EP11305213.8A EP2492882B1 (fr) | 2011-02-28 | 2011-02-28 | Dispositif de détection d'obstacles masquant un détecteur de fumée |
| PL11305213T PL2492882T3 (pl) | 2011-02-28 | 2011-02-28 | Urządzenie do wykrywania przeszkód maskujących detektor dymu |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP11305213.8A EP2492882B1 (fr) | 2011-02-28 | 2011-02-28 | Dispositif de détection d'obstacles masquant un détecteur de fumée |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2492882A1 EP2492882A1 (fr) | 2012-08-29 |
| EP2492882B1 true EP2492882B1 (fr) | 2014-02-19 |
Family
ID=44310065
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP11305213.8A Active EP2492882B1 (fr) | 2011-02-28 | 2011-02-28 | Dispositif de détection d'obstacles masquant un détecteur de fumée |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP2492882B1 (sr) |
| DK (1) | DK2492882T3 (sr) |
| PL (1) | PL2492882T3 (sr) |
| RS (1) | RS53300B (sr) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4057247A1 (en) * | 2021-03-08 | 2022-09-14 | Carrier Corporation | A method of fire detector cover detection and corresponding fire detection apparatus |
| EP4530604A4 (en) * | 2022-11-08 | 2025-09-03 | Siterwell Electronics Co Ltd | ALARM WITH OBSTACLE DETECTION FUNCTION |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2765566A3 (de) * | 2013-02-08 | 2014-11-05 | SCHAKO Klima Luft Ferdinand Schad KG | Rauchmelder |
| EP2879104B2 (de) * | 2013-11-27 | 2022-05-11 | Siemens Schweiz AG | Zusatzeinrichtung für einen als Punktmelder ausgebildeten Gefahrenmelder zur Funktionsüberwachung des Gefahrenmelders, sowie Anordnung und Verwendung einer solchen Einrichtung |
| US10809173B2 (en) * | 2017-12-15 | 2020-10-20 | Analog Devices, Inc. | Smoke detector chamber boundary surfaces |
| US11788942B2 (en) | 2017-12-15 | 2023-10-17 | Analog Devices, Inc. | Compact optical smoke detector system and apparatus |
| US11783688B2 (en) | 2018-03-13 | 2023-10-10 | Carrier Corporation | Aspirating detector system |
| CN109215277B (zh) * | 2018-11-21 | 2021-12-17 | 应镇阳 | 一种智能城市用火警报警装置 |
| US12211370B2 (en) | 2018-12-02 | 2025-01-28 | Analog Devices, Inc. | Fire detection system |
| US10921367B2 (en) | 2019-03-06 | 2021-02-16 | Analog Devices, Inc. | Stable measurement of sensors methods and systems |
| EP4174812B1 (en) * | 2019-04-02 | 2024-07-03 | E.I. Technology Unlimited Company | Ultrasonic detectors |
| US11796445B2 (en) | 2019-05-15 | 2023-10-24 | Analog Devices, Inc. | Optical improvements to compact smoke detectors, systems and apparatus |
| CN110930631A (zh) * | 2019-11-26 | 2020-03-27 | 福建好神奇电子科技有限公司 | 一种光电式火灾烟雾报警器及其烟雾检测偏差的补偿方法 |
| CN111696307B (zh) * | 2020-06-10 | 2021-04-02 | 深圳泽保智能科技有限公司 | 一种探测火灾的光学探测装置 |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005241556A (ja) * | 2004-02-27 | 2005-09-08 | Optex Co Ltd | 受動型赤外線感知器、およびそれに用いられる妨害検知システム |
| DE102006023048C5 (de) * | 2006-05-17 | 2014-12-11 | Techem Energy Services Gmbh | Brandwarnmelder und Verfahren zur Überprüfung dessen Funktionsfähigkeit |
| US7791475B2 (en) * | 2008-03-26 | 2010-09-07 | Honeywell International Inc. | Apparatus and method of blockage detection |
-
2011
- 2011-02-28 RS RS20140189A patent/RS53300B/sr unknown
- 2011-02-28 EP EP11305213.8A patent/EP2492882B1/fr active Active
- 2011-02-28 PL PL11305213T patent/PL2492882T3/pl unknown
- 2011-02-28 DK DK11305213.8T patent/DK2492882T3/da active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4057247A1 (en) * | 2021-03-08 | 2022-09-14 | Carrier Corporation | A method of fire detector cover detection and corresponding fire detection apparatus |
| EP4530604A4 (en) * | 2022-11-08 | 2025-09-03 | Siterwell Electronics Co Ltd | ALARM WITH OBSTACLE DETECTION FUNCTION |
Also Published As
| Publication number | Publication date |
|---|---|
| PL2492882T3 (pl) | 2014-11-28 |
| EP2492882A1 (fr) | 2012-08-29 |
| DK2492882T3 (da) | 2014-05-12 |
| RS53300B (sr) | 2014-08-29 |
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