WO2001065515A1 - Dispositif de detection d'une fracture dans une plaque de verre - Google Patents

Dispositif de detection d'une fracture dans une plaque de verre Download PDF

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Publication number
WO2001065515A1
WO2001065515A1 PCT/EP2001/002101 EP0102101W WO0165515A1 WO 2001065515 A1 WO2001065515 A1 WO 2001065515A1 EP 0102101 W EP0102101 W EP 0102101W WO 0165515 A1 WO0165515 A1 WO 0165515A1
Authority
WO
WIPO (PCT)
Prior art keywords
radiation
arrangement according
glass pane
glass
detector
Prior art date
Application number
PCT/EP2001/002101
Other languages
German (de)
English (en)
Inventor
Keming Du
Original Assignee
Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
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 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. filed Critical Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
Publication of WO2001065515A1 publication Critical patent/WO2001065515A1/fr

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/02—Mechanical actuation
    • G08B13/04—Mechanical actuation by breaking of glass
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/18—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
    • G08B13/181—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using active radiation detection systems
    • G08B13/183—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using active radiation detection systems by interruption of a radiation beam or barrier
    • G08B13/184—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using active radiation detection systems by interruption of a radiation beam or barrier using radiation reflectors

Definitions

  • the invention relates to an arrangement for detecting a glass break in a glass pane
  • safety glass In every building, daylight, but also for optical design, glass windows or glass panes are used.With regard to the security of buildings, glass windows are a weak point due to their low mechanical strength.For safety reasons, safety glass is therefore already installed in many buildings, at which is, inter alia, a multi-pane glass with film layers between individual glass panes, so that destruction of the pane on the film is only possible with increased effort and the associated noise development. Furthermore, safety glasses are known which, when a predetermined mechanical load is exceeded, for example at an attempted break-in, splinter into small parts, which activates a built-in resistance detector and triggers a corresponding alarm.
  • DE 23 53 702 A1 which represents the next state of the art with respect to the present invention, describes burglar protection for surfaces, among other things in an embodiment variant in which a Laser is used as a light source.
  • the radiation from this laser is inserted into the glass pane and the change in the phase relationship between a modulated light source and a receiver is detected.
  • the light beam is hereby inside the pane via reflective layers provided on the periphery of the pane. reflected several times within the disc.
  • DE 39 09 814 C2 describes a glass breakage detection device for monitoring glass panes with a light barrier in a closed circuit, when the circuit is interrupted an alarm device responds.
  • the light barrier comprises an infrared light path within the glass pane to be monitored. At least one infrared is in the area of the pane edges Transmitter and an infrared receiver arranged.
  • the glass pane to be monitored also has a transparent coating on one or both sides of the pane surface, which can, for example, be vapor-deposited, as a reflector for the infrared radiation. or outside lighting as well as exposure to sunlight
  • US Pat. No. 4,483,280 describes an arrangement for the protection of glass surfaces, wherein a pair of parallel edges of the glass surface to be protected are coated with light-reflecting layers, the light emitted by a light source. goes to a receiver within the glass pane. The receiver is arranged to generate a signal depending on the light, such an alarm is issued when the light is disturbed.
  • An essential measure with this arrangement is that the light reflecting Layers applied to the edges are formed from elements that reflect an incident light beam regardless of its angle of incidence parallel to the direction of incidence thereof in the plane that extends between the layers.
  • These light reflecting layers can be formed from p-shaped elements be, which extend along the opposite edges of the glass pane to be protected, the surfaces of the prisms are arranged in the longitudinal direction of the edges of the pane.
  • Such reflective surfaces can be formed by profile elements which are placed around the edges of the glass pane to be protected who the, the reflection surfaces run in the longitudinal direction of this profile and the prism surfaces are arranged at 90 ° to each other. Even if the profile is not mounted exactly at right angles to the edges of the glass pane, the reflected rays run parallel to the incident light rays
  • the object of the present invention is to provide an arrangement for detecting a broken glass in a pane of glass which can be produced at low cost and with which a broken glass can be detected reliably and reliably
  • the above object is achieved by an arrangement for the detection of a glass breakage of a glass pane, which has at least one optical radiation source and at least one detector, at least some of the radiation emitted by the radiation source being coupled into the glass pane via an edge thereof, the circumference of the glass pane Glass pane a retroreflective layer and / or structure is formed, on which the coupled radiation is reflected such that the reflected radiation is reflected back at least in the plane perpendicular to the glass surface parallel to the detector in the opposite direction of propagation, with the opposite direction of propagation, the detector a signal provides this in a defined relation to the intensity of the radiation detected by the detector stands, and the change in the signal for monitoring the glass pane is detected
  • a radiation source and a radiation-sensitive detector are arranged on the periphery of the glass pane.
  • the radiation from the radiation source is coupled into the glass via a correspondingly modified edge.
  • the radiation source and the detector are positioned in such a way that at least * -, part of the radiation falls into the detector after at least one simple pass.
  • the amount of radiation incident into the detector is evaluated for monitoring the glass. In the event of glass breakage, changes occur the amount of radiation detected or the intensity received at the detector The corresponding signal change is assessed as an event of glass breakage in order to trigger a corresponding alarm.
  • a diode laser or a light-emitting diode is preferably used as the radiation source.
  • a retro-reflective layer and / or structure is formed around the circumference of the glass pane. This retro-reflective layer and / or structure leads to the fact that the reflected radiation, based on the coupled radiation, is parallel to the glass at least in the plane perpendicular to the glass surface with the opposite direction of propagation Detector is reflected back With the retroreflective structure and / or coating, the incident radiation is reflected back almost anti-parallel into the radiation source. In this way it is possible that the radiation source and the detector can also be spatially combined as a transmitting and receiving unit, by the number components and thus minimize complexity
  • the radiation source and / or the detector is preferably arranged in the region of a corner of the glass pane, which is particularly advantageous if these two parts are combined into one unit
  • the radiation should be coupled into the glass or the glass pane in such a way that it is folded several times through the edges of the glass pane.This multiple folding results in multiple radiation paths within the glass pane, which form a two-dimensional network.At the end of the radiation path, at least one optical path then becomes Detector positioned to detect the radiation intensity.
  • the radiation paths should be so close that a change in the signal from the detector is obtained at any point in the event of glass breakage.
  • the density of the radiation paths can be obtained, inter alia, by the angle of incidence of the radiation into the glass pane Due to such a dense network, the detector can be arranged at any point on the edge of the glass pane in order to detect the radiation intensity at this point
  • the retroreflective structure is preferably formed by a field of roof edge mirrors, the angle between the edges being approximately 90 ".
  • These roof edge mirrors should also be arranged in such a way that their mirror surfaces are oriented essentially perpendicular to the top surfaces of the glass pane Roof edge mirrors, the mirror surfaces of which form an angle to one another, and thus also at the edges, of approximately 90 °, have the advantage that the rays are reflected back into the radiation source
  • the retroreflective structure can also be formed by an array of elements, each consisting of three reflective elements that are essentially perpendicular to one another. Surfaces are composed
  • a retroreflective structure can be applied on the one hand in the form of a layer, this layer can consist of a hardenable liquid in which retroreflective elements are embedded, or this layer can be in the form of a corresponding structure provided with retroreflective elements, which is embossed, for example the edges of the glass pane are applied
  • a part of the radiation reflected back into the radiation source is reflected by a radiation splitter in the optical detector and is detected by this.
  • one corner of the glass pane is curved as a concave, in the glass pane surface slightly protruding, polished surface, such a surface of a cylindrical jacket shape should run essentially perpendicular to the glass pane surfaces.
  • the radiation emitted by the optical radiation source can continue in different directions, practically over an angular range of 90 °, in the pane are irradiated, so that it is possible to couple radiation from all directions from a corner of the glass pane.
  • This arrangement can be particularly advantageous if an array of diode lasers is used as the radiation source, which is arranged in different angles Radiate the radiation into the glass pane through the flat surface of the cylinder
  • the wavelength of the radiation source can be in the near infrared range (NIR range), ie in a wavelength range of 1.5 ⁇ m.
  • the power of a diode laser used should be in the range of 2 mW or less, so that the radiation is harmless to the human eye
  • the wavelength can also be in the visible range, for example generated by a diode laser or a light-emitting diode, which emits radiation in the green or blue wavelength range
  • the radiation from the diode laser is collimated, the collimated radiation is guided through a radiation splitter and then focused into the glass of the glass pane. A portion of the radiation reflected back is deflected by the radiation actuator into the detector.
  • the radiation source and detector can be arranged in close association with one another.
  • the arrangement should furthermore be designed such that the radiation is guided through the two glass surfaces. This essentially results in no radiation loss at the boundary surfaces of the glass pane
  • an optical detector is a photodiode which, due to its small size, can be easily integrated with a glass pane or a window or an arrangement in which a glass pane is to be monitored
  • the cross-section of the glass of the glass pane can be scanned by deflecting the radiation by means of a rotating mirror.
  • Such a structure should always be used when stronger signals are required and a large glass surface is to be monitored
  • the radiation can be scanned across the glass cross-section by a lateral movement of the lens.
  • a spectral filter can be used in front of the detector in order to minimize the environmental influences and to increase reliability
  • panes made of plexiglass, plastics, polymeien and crystals or comparable materials insofar as they have the necessary transmission for the radiation
  • FIG. 1A shows a plan view of a glass pane with a radiation source and detector and a retroreflective structure on two side edges of the glass pane
  • FIG. 1B shows a view of the narrow end face of the glass pane, which is shown in FIG. 1A,
  • Figure 2 is a potted version of the radiation source-detector unit of the
  • FIG. 3 shows a view corresponding to FIG. 1A, but with a break point in the glass pane
  • FIG. 4A shows an enlarged section of the glass pane of FIGS. 1A and 3 in the region of an edge having the retroreflective structure
  • FIG. 4B schematically shows a retroreflective element
  • FIG. 4C schematically shows a sequence of retroreflective elements
  • FIG. 5 shows a glass pane with two radiation source detector units arranged in two adjacent corners of the glass pane as well as a retroreflective structure provided all around the edges of the glass pane,
  • Figure 6 is a representation of a glass sheet corresponding to Figure 5, but with a radiation source detector unit with pivotable scanning mirror, and
  • Figure 7 shows the arrangement of Figure 6, but with a linearly displaceable
  • FIG. 1A shows a glass pane in a plan view, designated by the reference number 1, which has a rectangular format with two narrow sides 2 and two long sides 3.
  • a radiation source detector unit is general designated with the reference numeral 4, arranged This lower, left corner of the glass pane is curved inwards, that is to say it is designed as a polished cylinder jacket surface 5, this cylinder jacket surface 5 running perpendicular to the glass surface 6
  • the two sides 2 and 3 of the glass pane 1 opposite the lower left corner are, as is never indicated by the reinforced edges, provided with a retroreflective structure and / or layer 7
  • the radiation source detector unit 4 which can be seen in a zoomed representation in Tigur 2, comprises a radiation source 8 in the form of a diode laser 9, to which a collimating lens 10 is assigned.
  • the collimated radiation leads into a radiation splitter 11 and is after Radiation splitter 11 fanned out by a further lens 12 over an angular range of approximately 90 °.
  • These fanned out rays 13 are coupled into the glass pane 1 via the cylinder jacket surface 5, as FIG. 1A in turn shows.
  • These beams 13 coupled into the glass pane 1 become at the retroreflective Layer 7 on the two side edges 2, 3 quasi anti-parallel back into the further lens 12 and thus into the radiation splitter 11.
  • This retroreflective layer and thus the generated reflection back into the radiation source make it possible to use the radiation source 8 and one Detector 14 spatially as a transmitting and receiving unit, ie to the steel station gsuze-detector unit 4, so that the number of components and thus the complexity of the arrangement is minimized
  • the radiation returned to the beam splitter 11 via the further lens 12 is partly deflected by 90 "on a beam splitter surface 15 and coupled into the detector 14 via a spectral filter 16 and a focusing lens 17.
  • This detector 14 can be, for example, a photodiode act, which is inexpensive and of small size.
  • the spectral filter 16 is optionally used between the beam splitter 11 and the detector 14 in order to reduce the effects of ambient light. reduce The preferred position of this spectral filter 16 is that as shown in FIG. 2, ie between radiation splitter 11 and focusing lens 17
  • the intensity of the radiation returned to the detector 14 changes. This changes, that is to say decreases , Intensity is evaluated and used as an alarm signal for a glass break or a break 18
  • the sensitivity of the detector 14 or the response of a corresponding evaluation unit is to be designed so that the change in the received intensity caused by the smallest break 18 can be clearly detected Influences such as noise, ambient rays and other environmental conditions, the radiation 13 of the radiation source 8 or the diode laser 9 can be pulsed or coded in time. Coding here means a time-defined pulse sequence which is detected and evaluated in each case.
  • a pulse sequence k can be generated by a random generator to rule out manipulation of the arrangement.
  • the mean radiation power can also be reduced, as a result of which the risk to the human eye from the radiation from the radiation source can be minimized or excluded
  • An essential feature of the anoid arrangement is the retroreflective structure or layer 7 applied to the glass edges 2, 3 and directed towards the center of the glass pane 1.
  • These structures can be a field of roof edge mirrors, as shown in Figure 4A
  • Roof edge mirrors 19 each have mirror surfaces 20 which are arranged with their planes perpendicular to the glass and flat 6. The angle between the adjacent edge or mirror surfaces 20 is approximately 90 °. In addition, the angle between the edge surfaces 20 and the glass edge 21 of the glass pane 1 is approximately 45 ° Because of this retroreflective structure 7, the rays 13 which respectively strike the roof edge mirrors 19 are deflected such that they are reflected back parallel to one another the incident rays 13 is
  • FIG. 4B Another possibility of a retroreflective structure is an array of elements, which are each constructed from three essentially perpendicular surfaces, such an element is shown schematically in FIG. 4B. These elements can then be strung together in a continuous arrangement, as shown in FIG. 4C is shown, which shows schematically the closest packing of these elements
  • Retroreflectors such as are used in road traffic on motor vehicles, on signs, on bicycles, etc. are suitable as retroreflective layer 7.
  • retroreflective structures 7, as are also shown in FIGS. 4A to 4C can be produced by embossing or in shape a layer which can be applied to the edges 2, 3 of the glass pane 1 and in which individual elements, such as are shown, for example, in FIG. 4B, are added.
  • the layers can also be produced in the form of a film, in order then to stick them onto the edge 21, so that for example, the arrangement is as shown in Figure 4A
  • source detector units 4 can be distributed around the glass pane 1, as shown in FIG. 5.
  • the two lower corners of the glass pane 1 each have a radiation source detector -Assigned unit 4, which correspond to the arrangement which is also shown and explained with reference to FIGS. 1 and 3.
  • FIG. 6 shows a glass pane which corresponds to that of FIG.
  • FIG. 7 A similar principle is based on the arrangement of FIG. 7, in which a radiation source-detector unit 34 is used, which, shown schematically, uses a linear lens 36, which is indicated by the double arrow 35 and carries out movement, in order to reduce the cross section of FIG Scanning glass pane 1 A glass break point 18 is indicated in FIG. 7, in which a radiation source-detector unit 34 is used, which, shown schematically, uses a linear lens 36, which is indicated by the double arrow 35 and carries out movement, in order to reduce the cross section of FIG Scanning glass pane 1 A glass break point 18 is indicated in FIG. 7, in which a radiation source-detector unit 34 is used, which, shown schematically, uses a linear lens 36, which is indicated by the double arrow 35 and carries out movement, in order to reduce the cross section of FIG Scanning glass pane 1 A glass break point 18 is indicated in FIG. 7, in which a radiation source-detector unit 34 is used, which, shown schematically, uses a
  • the radiation source-detector units can each be implemented by a so-called CD head, which is used in CD players and represents an inexpensive, hand-held component

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)

Abstract

La présente invention concerne un dispositif permettant la détection d'une fracture dans une plaque de verre, ledit dispositif présentant au moins une source de rayonnement optique et au moins un détecteur. Au moins une partie du rayonnement émis par la source de rayonnement est appliqué à la plaque de verre via une arête de celle-ci. Une couche et/ou structure à action rétroréfléchissante est formée autour de la plaque de verre, le rayonnement appliqué étant réfléchi au niveau de ladite couche et/ou structure de sorte que le rayonnement réfléchi est renvoyé au détecteur, en parallèle, par rapport au rayonnement appliqué, au moins dans le plan perpendiculaire à la surface de verre et avec une direction opposée à la direction de propagation, le détecteur produisant un signal qui est lié par une relation définie à l'intensité du rayonnement détecté par le détecteur et la modification du signal étant détectée de manière à surveiller l'état de la plaque de verre.
PCT/EP2001/002101 2000-02-29 2001-02-23 Dispositif de detection d'une fracture dans une plaque de verre WO2001065515A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10009561 2000-02-29
DE10009561.5 2000-02-29

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Publication Number Publication Date
WO2001065515A1 true WO2001065515A1 (fr) 2001-09-07

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PCT/EP2001/002101 WO2001065515A1 (fr) 2000-02-29 2001-02-23 Dispositif de detection d'une fracture dans une plaque de verre

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WO (1) WO2001065515A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202006013375U1 (de) * 2006-08-31 2006-11-02 Sick Ag Ziel für eine optoelektronische Schutzeinrichtung
GB2489340B (en) 2010-01-18 2016-10-12 Wieser Stefan Apparatus and method for monitoring a building opening
WO2013142962A1 (fr) * 2012-03-28 2013-10-03 Tyco Safety Products Canada Ltd. Systèmes et procédés anti-sabotage

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4107522A (en) * 1975-11-11 1978-08-15 Erwin Sick Gesellschaft Mit Beschrankter Haftung Optik-Elektronik Rotary beam light curtain
US4239961A (en) * 1979-01-23 1980-12-16 Theodore Lasar Photoelectric light curtain using retroreflector
DE3015342A1 (de) * 1980-04-22 1981-10-29 Fa. Carl Zeiss, 7920 Heidenheim Einbruchsicherung fuer flaechen
US4384280A (en) * 1979-06-09 1983-05-17 Gunter Haag Anti-entry device for surfaces

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2353702C3 (de) * 1973-10-26 1979-03-29 Guenter 7000 Stuttgart Haag Einbruchsicherung für Flächen
DE3909814A1 (de) * 1989-03-24 1990-10-04 Manfred Stueckroth Glasbruchmeldeeinrichtung zur ueberwachung von glasscheiben

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4107522A (en) * 1975-11-11 1978-08-15 Erwin Sick Gesellschaft Mit Beschrankter Haftung Optik-Elektronik Rotary beam light curtain
US4239961A (en) * 1979-01-23 1980-12-16 Theodore Lasar Photoelectric light curtain using retroreflector
US4384280A (en) * 1979-06-09 1983-05-17 Gunter Haag Anti-entry device for surfaces
DE3015342A1 (de) * 1980-04-22 1981-10-29 Fa. Carl Zeiss, 7920 Heidenheim Einbruchsicherung fuer flaechen

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Publication number Publication date
DE10109750A1 (de) 2001-09-13
DE10109750C2 (de) 2002-09-26

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