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EP3009998A1 - Linearer rauchdetektor mit integriertem laser für positionierung des reflektors - Google Patents

Linearer rauchdetektor mit integriertem laser für positionierung des reflektors Download PDF

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Publication number
EP3009998A1
EP3009998A1 EP15189410.2A EP15189410A EP3009998A1 EP 3009998 A1 EP3009998 A1 EP 3009998A1 EP 15189410 A EP15189410 A EP 15189410A EP 3009998 A1 EP3009998 A1 EP 3009998A1
Authority
EP
European Patent Office
Prior art keywords
laser
transmitter
receiver
integrated
integrated laser
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.)
Withdrawn
Application number
EP15189410.2A
Other languages
English (en)
French (fr)
Inventor
Vincent LAVIELLE
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
D'etude Et De Fabrication Industrielle Ste
Original Assignee
D'etude Et De Fabrication Industrielle Ste
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by D'etude Et De Fabrication Industrielle Ste filed Critical D'etude Et De Fabrication Industrielle Ste
Publication of EP3009998A1 publication Critical patent/EP3009998A1/de
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • 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
    • 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 a linear smoke detector to be disposed in a room, in particular on a wall, for detecting smoke in the event of the beginning of a fire.
  • a linear detector is a beam emitter / receiver, generally infrared, which is reflected on a reflex reflector fixed on a remote wall. The collected beam back is detected and analyzed in order to deduce a presence or not of smoke.
  • the present invention aims to further improve the installation time of the linear detector and reflector assembly. Another object of the invention is to simplify the installation.
  • a linear smoke detector including a transmitter for transmitting an optical beam and a receiver for receiving a portion of the optical beam reflected on a remote reflector.
  • the installation is done quickly and easily. Indeed, an integrated laser is used and not a removable module as in the prior art. In the context of the invention, the installer is no longer obliged to always carry a removable module that can also be damaged in transport. Transport and multiple use of this removable module may change the orientation of the laser, subsequently lead to incorrect installation.
  • having an integrated power supply specifically dedicated to the integrated laser allows an immediate alignment process even when the general power supply from the fire detection center is not available.
  • a technician having to install several tens of detectors can realize his installations, correctly align each reflector associated with a linear detector without powering up the fire detection center which could be involved in a second time under the responsibility of another nobody.
  • the present invention provides a rigid base carrying the integrated laser, the transmitter and the receiver. In this way, we solve the problem orientation of the laser relative to the transmitter. Indeed, in the case of a removable module as in the prior art, a poor engagement of the module on the linear detector inexorably leads to misalignment and poor pointing. Depending on the distance between the two walls on which the linear detector and the reflector are respectively to be placed, a small orientation difference between the laser and the transmitter at the linear detector causes a pointing error on the wall opposite . A pointing error is to point the laser to a location separate from where the light beam of the detector should point, so that the reflector would not be reached.
  • the integrated laser may be a cylindrical laser along its optical axis, this integrated laser having a very small pointing error, for example less than or equal to 10 mrad.
  • the pointing error can be defined by the angular deviation between the optical axis and the mechanical axis of the laser.
  • a particular type of laser of elongated shape is thus used, which has a high precision. Its cylindrical shape is an interesting anchoring area.
  • the rigid base may be a planar integrated circuit; the integrated laser, the transmitter and the receiver being arranged so that their optical axes are perpendicular to the integrated circuit.
  • a positioning and orientation wedge is designed to come into contact with the integrated laser and to position itself in the same direction as the integrated laser.
  • the positioning wedge is a hollow cylinder engaging with the integrated laser.
  • the wedge can be a female part that fits all or part of the integrated laser.
  • the plug between the two components is rigid.
  • the cover comprises a flat bottom so that the longitudinal axis of the positioning wedge and the axes of revolution of the cones are perpendicular to this bottom.
  • the integrated laser forms a right angle with the integrated circuit, then the integrated circuit and the bottom of the cover are parallel.
  • the linear detector may comprise a push button for activating and deactivating the integrated laser.
  • the linear detector may include a counter for disabling the integrated laser after a predetermined duration of operation. Since the integrated laser power supply is battery-powered, it is preferable to limit the operating time to a few minutes. It is therefore possible to activate the integrated laser by first pressing the push button and then deactivating the integrated laser by pressing the same pushbutton again, the deactivation can also take place automatically after a certain duration.
  • the transmitter and the receiver are powered solely by the fire detection unit.
  • the battery powers the integrated laser only and totally.
  • the set constitutes a fire detection system.
  • a linear detector 3 is recessed in the wall 1 so that the upper cover of this detector touches the wall 1 or overhangs this wall of negligible thickness, that is to say a thickness that can hardly be perceived at a distance, typically less than 8mm.
  • the present invention can also be applied to any non-flush linear detector.
  • a linear detector is a clearly identified device whose function is to emit a beam of light and to receive a portion of this light beam. The intensity of the beam of light received makes it possible to determine whether the atmosphere traversed by the light beam comprises smoke or not.
  • the linear detector 3 has the object of emitting a light beam in the direction of a reflector 4 which is advantageously a retro-reflector disposed on the wall 2 opposite.
  • the reflector 4 is designed and positioned to return in the same direction and in the opposite direction any incident light beam.
  • the present invention is particularly intended to facilitate the installation of this reflector in front of the linear detector.
  • the dimensions on the figure 1 are not to scale. Generally, the distance between two walls is several meters, for example up to 20m, 30m or more. At this distance, it is not easy to place naturally and quickly the reflector in front of the linear detector. To do this, it is interesting to use a visible laser beam to point and indicate the part of the wall facing the linear detector.
  • FIG. 2 very schematically, we see some internal components of a linear detector according to the invention.
  • a plastic shell 5 of cylindrical shape. This shell has openings on its base or on one side for the passage of power cables and signal transmission.
  • Fastening means (not shown) are provided at the bottom of the shell for the maintenance of a printed circuit 7.
  • This printed circuit is powered by cables from a power supply network via the wall.
  • a transmitter 9 for emitting a light beam towards the reflector 4 and a receiver 10 for receiving the light beam reflected by the reflector 4.
  • the transmitter 9 is advantageously a light emitting diode (LED or LED in the English language for Light Emitting Diode) type CMS fixed for example directly on the printed circuit 7. It may be a diode emitting a diverging light beam.
  • known optical devices such as lenses or collimators are provided so that the transmitter can transmit a maximum of power to the outside and so that the receiver can capture a maximum of reflected beam.
  • an integrated laser 8 for emitting a laser beam during the installation of the linear detector and the reflector.
  • a battery 11 is provided for supplying only the integrated laser 8.
  • the laser beam emitted by the integrated laser 8 is intended to be seen on the wall where the reflector is to be installed. It is not intended to capture any reflected laser beam.
  • a pushbutton 12 makes it possible to activate or deactivate the integrated laser 8 by supplying the integrated laser 8 with the battery 11 or not.
  • a digital counter 20 is also provided on the printed circuit between the battery and the integrated laser. This counter is a timer made from electronic components that automatically turns off the power of the integrated laser 8 after 20 minutes of operation.
  • the integrated laser, the transmitter and the receiver are arranged so that their optical axes are parallel to each other.
  • the beam emissions (of the integrated laser 8 and the transmitter 9) are perpendicularly to the plane of the printed circuit 7.
  • This printed circuit can be considered as a plane on which the components are arranged perpendicularly to this plane.
  • a cover 6 is provided to close the shell 5 thus constituting an inner chamber in which the components are.
  • the cover 6 has a wedge 13 and two cones 14 and 15, the assembly forming a single rigid mechanical part.
  • the wedge 13 is of cylindrical shape and intended to engage with the integrated laser 8. This wedge 13 completely fits the upper part of the integrated laser 8 so that this coupling conditions the placement of the two cones 14 and 15 with respect to the transmitter 9 and the receiver 10. It is expected that the optical axis of the integrated laser 8 and the axis of revolution of the wedge are confused at 18. In particular, the wedge forms a right angle with the base or the bottom of the cover 6.
  • the axes of revolution of the cones are by construction parallel to the respective optical axes 16 and 17 of the shim.
  • the linear detector When the cover is placed on the shell, the linear detector is constituted and in normal operation, the transmitter 9 transmits via the transmission cone 14, and the receiver 10 captures the beam passing via the reception cone 15.
  • the printed circuit board 7 also carries a microprocessor 19 for managing the transmitter, the receiver and other active components of the linear detector.
  • the figure 3 illustrates a little more in detail a laser having a small pointing error such as for example an optical axis deviation with respect to the mechanical axis less than 10 mrad ( ⁇ 0.6 °).
  • This laser has three tabs 20 for connection and attachment in the printed circuit 7.
  • the fixing is in plane support on the printed circuit board 7 by the bottom 21.
  • the outer shell 22 of the laser 8 contains a laser diode 23 supporting a converging lens 24
  • the spring can be compressed more or less using a compression screw 26 in engagement with a thread 27 made on the inner face of the outer shell 22.
  • the lens 24 is housed in the screw 26 so that the action of screwing or unscrewing this screw brings the lens closer to or away from the laser diode, which makes it possible to adjust the divergence of the integrated laser assembly.
  • the laser beam emanating from the laser diode can pass through the spring 25, the lens 24 and an opening 28 made in the central zone of the screw 26.
  • a support of the linear detector is fixed on the first wall.
  • the electrical connection is made with the remote fire detection unit.
  • the push button is pressed to activate the built-in laser.
  • the laser beam thus emitted constitutes a laser pointer which is displayed on an opposite wall. The user can then correctly position the reflector relative to the transmitter and the receiver. This pointing function is autonomous and does not require powering the transmitter and the receiver.
  • the laser pointer is deactivated by pressing the pushbutton again or after a delay of 20 minutes.
  • the retro-reflector is at a distance greater than 50 cm from the laser spot, it is possible to adjust the orientation of the transmitting part receiver using for example adjusting screw or other adjustment device to bring the laser spot to a distance less than 20cm from the reflector.
  • the distance of 20 cm is in particular determined according to the diameter of the optical beam which will be emitted by the transmitter in normal operation.

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  • 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)
EP15189410.2A 2014-10-14 2015-10-12 Linearer rauchdetektor mit integriertem laser für positionierung des reflektors Withdrawn EP3009998A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1459823A FR3027146B1 (fr) 2014-10-14 2014-10-14 Detecteur lineaire de fumee avec laser integre pour le positionnement du reflecteur

Publications (1)

Publication Number Publication Date
EP3009998A1 true EP3009998A1 (de) 2016-04-20

Family

ID=52021277

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15189410.2A Withdrawn EP3009998A1 (de) 2014-10-14 2015-10-12 Linearer rauchdetektor mit integriertem laser für positionierung des reflektors

Country Status (2)

Country Link
EP (1) EP3009998A1 (de)
FR (1) FR3027146B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3009999A1 (de) * 2014-10-16 2016-04-20 Société d'Etude et de Fabrication Industrielle Eingebauter linearer rauchdetektor
CN107358779A (zh) * 2017-08-21 2017-11-17 北大青鸟环宇消防设备股份有限公司 一种线型光束感烟火灾探测器

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040155786A1 (en) 2003-01-29 2004-08-12 Heinz Guttinger Method and tool for installing a linear smoke detector
US20080316039A1 (en) * 2005-05-16 2008-12-25 Mark White Apparatus and Method For Infrared Beam Smoke Detection
WO2014102519A1 (fr) * 2012-12-28 2014-07-03 Finsecur Dispositif d'émission de lumière pour la détection de passage ou de fumée et procédé de fabrication d'un tel dispositif

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040155786A1 (en) 2003-01-29 2004-08-12 Heinz Guttinger Method and tool for installing a linear smoke detector
US20080316039A1 (en) * 2005-05-16 2008-12-25 Mark White Apparatus and Method For Infrared Beam Smoke Detection
WO2014102519A1 (fr) * 2012-12-28 2014-07-03 Finsecur Dispositif d'émission de lumière pour la détection de passage ou de fumée et procédé de fabrication d'un tel dispositif

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3009999A1 (de) * 2014-10-16 2016-04-20 Société d'Etude et de Fabrication Industrielle Eingebauter linearer rauchdetektor
CN107358779A (zh) * 2017-08-21 2017-11-17 北大青鸟环宇消防设备股份有限公司 一种线型光束感烟火灾探测器

Also Published As

Publication number Publication date
FR3027146B1 (fr) 2016-12-09
FR3027146A1 (fr) 2016-04-15

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