WO1984004985A1 - Systeme de securite a laser - Google Patents

Systeme de securite a laser Download PDF

Info

Publication number
WO1984004985A1
WO1984004985A1 PCT/AU1984/000099 AU8400099W WO8404985A1 WO 1984004985 A1 WO1984004985 A1 WO 1984004985A1 AU 8400099 W AU8400099 W AU 8400099W WO 8404985 A1 WO8404985 A1 WO 8404985A1
Authority
WO
WIPO (PCT)
Prior art keywords
pane
light
glass
detector
security system
Prior art date
Application number
PCT/AU1984/000099
Other languages
English (en)
Inventor
John Leonard Hughes
Original Assignee
Hughes Technology Pty Ltd
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 Hughes Technology Pty Ltd filed Critical Hughes Technology Pty Ltd
Publication of WO1984004985A1 publication Critical patent/WO1984004985A1/fr

Links

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
    • G08B13/12—Mechanical actuation by the breaking or disturbance of stretched cords or wires
    • G08B13/126—Mechanical actuation by the breaking or disturbance of stretched cords or wires for a housing, e.g. a box, a safe, or a room
    • 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

Definitions

  • This invention relates to a security alarm system which i off when an intruder attempts to enter the region secured said invention by cracking or breaking panes of glass set doors, windows and sky lights, transparent covers for val objects etc. consisting of panes of glass or plastic mate (herein after referred to simply as panes of glass) into may be embedded rods of glass (or rods of plastics and pl pane) of approximately the same refractive index through light from light emitting diodes or laser diodes sealed o the edge of said pane of glass propagates onto light dete sealed onto the said edge on the opposite side of said pa glass, optical rods to enhance the signal to noise ratio said detectors, power supplies to drive said light emitti diodes and optical detectors, interconnecting leads, cont unit and an alarm indicator.
  • panes of glass used in this invention fit into windows doors and skylights as do prior art panes of glass, howeve the panes of glass of this invention, if cracked or broken by an intruder set off an alarm which is activated by the propagation path of the light within glass rods (or plasti rods in a plastic pane) embedded into the said pane of gla of approximately the same refractive index as said pane, being cracked or broken themselves in such a manner as to interfere with the level of light intensity detected by th optical detector monitoring the output of light from said
  • both the photo-emitting diodes and the optically filtered optical detectors are sealed onto the edges of the pane of glass on opposite ends of the embedde rods of glass so that a portion of the light emitted by th light emitting diode or laser diode, is propagated along t embedded rod
  • a further prote against false alarm is provided by my invention by modulat the photo emitting diode transmitter with a randomly gener code. It is an aim of this invention to provide a monitor of cracked or broken panes of glass as used in windows, doors and sky lights by reducing the transmission efficiency of light propagating within said pane of glass, said loss of intensity being detected via optically filtered, optical detectors which in turn trigger an alarm.
  • Figure 1 shows the high alarm threshold mode of this in ⁇ vention with the light emitting diode attached to one edg of the pane of glass so as to inject part of its output i the embedded glass rod which in turn propagates the said l onto the optical detector.
  • Figure 2 shows the lower alarm threshold configuration of this invention where the light from the diode is transmit through the pane of glass via critical reflections from i surfaces.
  • Figure 3 shows the overall configuration of thi invention with the transmitters and detectors sealed along the edge of the pane of glass and connected to power suppl control and alarm units.
  • numeral 1 indicates the cross-section pane of glass whilst numeral 2 indicates the high conducting rod.
  • numeral 3 indicates the light emitting source
  • numeral 5 indicates the narrow ban optical filter.
  • Light emitting source 3, optical detector and narrow band filter 5 are all sealed onto the edge of t pane of glass 1 by sealant indicated by numeral 6.
  • Numera indicates the lead connecting the light emitting diode 3 t its power supply whilst number 8 indicates the lead connec optical detector 4 to its power supply.
  • Numeral 9 indicates the lead connecting the optical detector 4 to the control alarm units.
  • numeral 10 indicates the path of light from light emitting source 3 to detector 4 via critical angle reflections between the surfaces of glass pane 1.
  • the oth numerals indicate equivalent members to those indicated by the same numerals in Figure 1.
  • numeral 11 indicates the complete glass windo pane and numeral 12 indicates the power supply for the lig emitting diodes 3.
  • Numeral 13 indicates the control unit whilst numeral 14 indicates the alarm system.
  • the other numerals indicate equivalent members to those indicated by the same numerals in Figure 1.
  • panes of glass can be connected up either in parallel or in series to control unit 14.
  • This invention has applications in securing any enclosure which has windows, doors or skylights with panes of glass or light transmitting media such as plastics and crystals.
  • This invention has application in securing buildings include ing banks, museums, houses, factories and offices.
  • This invention also has application in transparent covers for valuable objects, and hazardous environments.
  • This invention can also incorporate a glass pane opaque to optical radiation with embedded rods of material transpare to optical radiation.
  • the embedded rods may be repla with lengths of optical fibres, that is to say rods which already been clad.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)

Abstract

Vitre (1) dans laquelle est encastrée une série de tiges conductrices de lumière (2) de même indice de réfraction. Des sources émettant de la lumière (3) sont fixées à un bord de la vitre (1) de manière à injecter une partie de leur production dans les tiges conductrices de lumière (2) respectives encastrées qui propagent la lumière vers des détecteurs optiques (4) via des filtres optiques (5) à bande étroite. Lorsque la vitre (1) est cassée ou brisée par un intrus, l'intensité de la lumière conduite baisse, ce qui déclenche une alarme. Au lieu de tiges conductrices de lumière (3), la lumière peut être propagée par des réflections angulaires critiques entre les surfaces de la vitre (1). La présente invention peut être utilisée pour protéger fenêtres, portes et lucarnes dans lesquelles peuvent être insérés les vitres (1) et des dispositifs de fixation.
PCT/AU1984/000099 1983-06-03 1984-06-04 Systeme de securite a laser WO1984004985A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AU968883 1983-06-03

Publications (1)

Publication Number Publication Date
WO1984004985A1 true WO1984004985A1 (fr) 1984-12-20

Family

ID=3700475

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU1984/000099 WO1984004985A1 (fr) 1983-06-03 1984-06-04 Systeme de securite a laser

Country Status (1)

Country Link
WO (1) WO1984004985A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006125230A1 (fr) * 2005-05-20 2006-11-23 Roger Airey Point d’alerte d’incendie
ITTO20080535A1 (it) * 2008-07-11 2010-01-12 Gps Standard S P A Sistema di antintrusione in fibra ottica

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB437205A (en) * 1934-04-24 1935-10-24 Gen Electric Co Ltd Improvements in or relating to burglar alarms
US3742222A (en) * 1970-02-20 1973-06-26 Endl Elektronik Gmbh Co Photoelectric sensing system
FR2379869A1 (fr) * 1977-02-04 1978-09-01 Flavenot Bernard Systeme de surveillance d'au moins une vitre contre d'eventuelles tentatives de destruction
GB2038060A (en) * 1978-10-24 1980-07-16 Standard Telephones Cables Ltd Intruder alarm
AU7611281A (en) * 1980-10-10 1982-04-22 P E Pilkington Limited Intruder detection security system
DE3128073A1 (de) * 1981-07-16 1983-02-03 Fa. Aug. Winkhaus, 4404 Telgte Alarmmelder zur sicherung eines durchgangs
AU9031082A (en) * 1982-05-10 1983-05-19 Hughes Technology Pty. Ltd. A security system for the protection of buildings
DE3152800A1 (de) * 1981-07-16 1983-08-25 Fa. Aug. Winkhaus, 4404 Telgte Alarmmelder zur sicherung eines durchgangs oder durchgangsabschnitts

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB437205A (en) * 1934-04-24 1935-10-24 Gen Electric Co Ltd Improvements in or relating to burglar alarms
US3742222A (en) * 1970-02-20 1973-06-26 Endl Elektronik Gmbh Co Photoelectric sensing system
FR2379869A1 (fr) * 1977-02-04 1978-09-01 Flavenot Bernard Systeme de surveillance d'au moins une vitre contre d'eventuelles tentatives de destruction
GB2038060A (en) * 1978-10-24 1980-07-16 Standard Telephones Cables Ltd Intruder alarm
AU7611281A (en) * 1980-10-10 1982-04-22 P E Pilkington Limited Intruder detection security system
DE3128073A1 (de) * 1981-07-16 1983-02-03 Fa. Aug. Winkhaus, 4404 Telgte Alarmmelder zur sicherung eines durchgangs
DE3152800A1 (de) * 1981-07-16 1983-08-25 Fa. Aug. Winkhaus, 4404 Telgte Alarmmelder zur sicherung eines durchgangs oder durchgangsabschnitts
AU9031082A (en) * 1982-05-10 1983-05-19 Hughes Technology Pty. Ltd. A security system for the protection of buildings

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006125230A1 (fr) * 2005-05-20 2006-11-23 Roger Airey Point d’alerte d’incendie
ITTO20080535A1 (it) * 2008-07-11 2010-01-12 Gps Standard S P A Sistema di antintrusione in fibra ottica
EP2144207A1 (fr) * 2008-07-11 2010-01-13 GPS Standard S.p.A. Système anti-intrusion à fibre optique

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