EP0486018B1 - Einbruch-Detektor - Google Patents

Einbruch-Detektor Download PDF

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Publication number
EP0486018B1
EP0486018B1 EP91119446A EP91119446A EP0486018B1 EP 0486018 B1 EP0486018 B1 EP 0486018B1 EP 91119446 A EP91119446 A EP 91119446A EP 91119446 A EP91119446 A EP 91119446A EP 0486018 B1 EP0486018 B1 EP 0486018B1
Authority
EP
European Patent Office
Prior art keywords
detecting device
glass breakage
detector
detector according
intruder
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.)
Expired - Lifetime
Application number
EP91119446A
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English (en)
French (fr)
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EP0486018A1 (de
Inventor
Inc. Burle Technologies
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.)
Burle Technologies Inc
Original Assignee
Burle Technologies Inc
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Filing date
Publication date
Application filed by Burle Technologies Inc filed Critical Burle Technologies Inc
Publication of EP0486018A1 publication Critical patent/EP0486018A1/de
Application granted granted Critical
Publication of EP0486018B1 publication Critical patent/EP0486018B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • G08B13/16—Actuation by interference with mechanical vibrations in air or other fluid
    • G08B13/1654—Actuation by interference with mechanical vibrations in air or other fluid using passive vibration detection systems
    • G08B13/1681—Actuation by interference with mechanical vibrations in air or other fluid using passive vibration detection systems using infrasonic detecting means, e.g. a microphone operating below the audible frequency range
    • 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
    • G08B13/189—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems
    • 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

Definitions

  • the invention relates to an intruder detector according to the preamble of Patent Claim 1 and in particular to an acoustic pressure wave glass monitor.
  • German Offenlegungsschrift 2,656,3108 which is the starting point of the preamble of Patent Claim 1, discloses a device for detecting the movement of bodies emitting heat, in which two different detectors are connected such that an alarm is triggered only given the response of both detectors.
  • one detector is embodied as an ultrasonic detector and one detector is embodied as an infrared detector.
  • a problem with an intruder detector of this type consists in that an infrared detector can detect only movements perpendicular to the principal axis of its security zone and an ultrasonic detector can detect only movements in the direction of the principal axis of its security zone.
  • An intruder who moves only on the principal axis of the security zone or only at a right angle to the principal axis of the security zone of the detector can, by adopting this method of locomotion, avoid triggering the alarm since in so doing he always triggers only one of the two detectors .
  • a high security against intrusions and false alarms is guaranteed by the selection of the glass breakage criterion and of the pressure fluctuation criterion, since on the one hand both criteria are always fulfilled given the destruction of a pane in the security zone, while on the other hand both criteria are virtually incapable of being fulfilled by a person legitimately staying in the room to be secured.
  • the security against false alarms is further enhanced owing to the fact that triggering of the detecting devices is restricted to frequencies the combination of which arises exclusively given the destruction of the pane in a room.
  • a pressure detector 10 according to Figure 1 has a structure known per se and is designed such that it can effectively sense fluctuations in room pressure down to 0.3 mbar. It is arranged in the room to be secured in such a way that it senses pressure fluctuations in the entire security zone.
  • the output signal of the pressure detector 10 is fed to a first bandpass filter 15 which suppresses interfering signals not situated in the pressure fluctuation frequency range characteristic of a breaking pane.
  • a first bandpass filter 15 which suppresses interfering signals not situated in the pressure fluctuation frequency range characteristic of a breaking pane.
  • the frequencies of the pressure fluctuations arising given the destruction of a pane are situated between 5 Hz and 10 Hz.
  • the output signal of the bandpass filter 15 is fed to an amplifier 20 which has a gain of 300 at a frequency of 7.5 Hz.
  • the filtered and amplified signal of the pressure detector 10 is fed to a trigger 25 or to a Schmitt trigger circuit.
  • This trigger is the junction between the analog pressure-sensing circuit and the downstream digital circuit.
  • the output of the trigger is a high signal when the output signal of the amplifier 20 overshoots an adjustable threshold value, or a low signal when a smaller signal than the threshold value is present at the input of the trigger 25.
  • the threshold value of the trigger is selected such that fluctuations in room pressure of less than 0.3 mbar or in a range from -0.3 mbar to +0.3 mbar correspond to a low signal at the output of the trigger 25.
  • the output signal of the trigger 25 is fed to an AND element 60 and a light-emitting diode 50 which displays the undershooting or overshooting of the threshold value pressure of +0.3 mbar.
  • a glass breakage detector 30 is either mounted directly on a pane or arranged such that it can sense any noises from the breakage of a plurality of panes, which need not be situated in a plane window front.
  • the glass breakage detector 30 has a conventional structure
  • the glass breakage detector 30 is a microphone having a frequency response and a pickup pattern by means of which a glass breakage in the entire security zone of the glass breakage detector can be effectively sensed.
  • the output signal of the glass breakage detector 30 is fed to a second bandpass filter 35 which suppresses interfering signals which are not situated in the frequency range of the noises of glass breakage.
  • the lower limiting frequency is selected at 4 kHz and the upper limiting frequency at 12 kHz.
  • the output signal of the second bandpass filter is fed to a rectifier 40, since the downstream digital circuit operates with positive levels. Furthermore, the signal is smoothed or lengthened by the rectifier, so that it can be more effectively detected by the downstream circuit.
  • a downstream storage device 65 passes the high signal on to a downstream relay 70 and a light-emitting diode 75, which displays the case of an alarm.
  • the storage device 65 stores the high signal of the AND element 60 until a reset signal is applied to the storage device 65 via the reset input 80, or until the operating voltage of the storage device 65 is switched off.
  • the storage device 65 is designed such that it stores a low signal given application of the operating voltage.
  • the alarm report is transmitted, for example, to an alarm indicator or a report control centre by means of a contact assembly (not shown) of the relay 70.
  • the detector 85 according to Figure 2 is arranged in the room to be secured in such a way that it can effectively sense pressure fluctuations and noises of glass breakage in the entire security zone.
  • the detector 85 can detect vibrations in a range from 5 Hz to 12 kHz, and can be formed, for example, by a microphone which can sense this range.
  • the output signal of the detector 85 is fed to the bandpass filters 15 and 35, which transmit the corresponding frequency components thereof, as already in the case of the first exemplary embodiment.
  • the circuit downstream of the glass breakage detector 30 and the pressure detector 10 or the detector 85 is identical.
  • the sound waves of the noise of glass breakage are detected by the glass breakage detector 30 or the detector 85, conducted via the second bandpass filter 35 to the rectifier 40, where they are rectified and smoothed or maintained for a specific time T2 and transmitted with a 0.1 s delay time T1 via the time-delay circuit 45 as a high signal to the AND element 60, a light-emitting diode 55 simultaneously lighting up.
  • the time T2 can be selected in the range from 0.1 s to 1 s.
  • the pressure fluctuation has also reached the AND element 60 via the pressure detector 10 or the detector 85, the first bandpass filter 15, the amplifier 20 and the trigger 25 as a high signal, the light-emitting diode 55 lighting up and there arising at the output of the AND element 60 a high signal which is maintained via the storage device 65 and actuates the relay 70 as well as switching on a light-emitting diode 75.
  • an alarm report is transmitted to an alarm indicator or a report control centre via a contact assembly of the relay 70.
  • a high security against false alarms is achieved by means of the acoustic pressure wave glass monitor according to the invention. If the glass breakage detector is constructed as a microphone and mounted in a room in such a way that it monitors a plurality of windows or glass doors, the noises that are not situated in the frequency range of the noises of glass breakage are suppressed via the second bandpass filter 35.
  • the first bandpass filter 15 it is achieved that only the fluctuations typical of a glass breakage are transmitted.
  • Pressure fluctuations in the room owing to wind conditions around the building in which the zone to be secured is situated, or pressure fluctuations owing to the opening of a door or a window have fluctuation frequencies which are situated below the lower limiting frequency of the first bandpass filter 15. Moreover, pressure fluctuations owing to the impact of a bird on a pane are generally of so low an amplitude that the signals generated by the pressure detector 10 or the detector 85 are situated below the threshold voltage of the trigger 25.
  • the pressure detector and the glass breakage detector or the entire acoustic pressure wave glass monitor can be accommodated in a single housing.
  • the acoustic pressure wave glass monitor according to the invention can be used in rooms of up to 50 m 2 . Its mode of functioning is ensured even if individual windows or doors of the house to be secured are open.

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

Claims (14)

  1. Einbruchdetektor mit zwei verschiedenen Detektorvorrichtungen für die gleiche Sicherheitszone, der einen Alarm nur dann auslöst, wenn beide Detektorvorrichtungen einer bestimmten Weise ansprechen, dadurch gekennzeichnet, daß
    a) eine Detektorvorrichtung eine Glasbruchdetektor-Vorrichtung (30,35,40,45; 85,35,40,45) ist, die einen Glasbruchdetektor (30; 85) und ein Bandpaßfilter (35) umfaßt,
    b) die andere Detektorvorrichtung eine Druckschwankungsdetektor-Vorrichtung (10,15,20,25; 85,15,20,25) ist, die einen Druckdetektor und ein zweites Bandpaßfilter (15) umfaßt,
    c) ein Alarm nur ausgelöst wird, wenn beide Detektorvorrichtungen innerhalb bestimmter Frequenzbänder angesprochen werden,
    d) die Glasbruchdetektor-Vorrichtung eine Zeitverzögerungsschaltung (45) umfaßt, die das Auslösen der Glasbruchdetektor-Vorrichtung um eine vorbestimmte Zeitspanne T1 verzögert,
    e) die Glasbruchdetektor-Vorrichtung eine Berichtigungsschaltung (40) umfaßt, die das Signal der Glasbruchdetektor-Vorrichtung berichtigt und glättet, und
    f) die Berichtigungsschaltung ein Meldesignal der Glasbruchdetektor-Vorrichtung für eine vorbestimmte Zeitspanne T2 aufrechterhält, nachdem das Glasbruchgeräusch verklungen ist.
  2. Einbruchdetektor nach Anspruch 1, dadurch gekennzeichnet, daß ein Detektor (85) vorhanden ist, der als Glasbruchdetektor und Druckdetektor dient.
  3. Einbruchdetektor nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Druckschwankungsdetektor-Vorrichtung einen Trigger (25) umfaßt, der verhindert, daß Druckschwankungen mit zu kleiner Amplitude die Druckschwankungsdetektor-Vorrichtung auslösen.
  4. Einbruchdetektor nach einem der vorgenannten Ansprüche, dadurch gekennzeichnet, daß die Druckschwankungsdetektor-Vorrichtung einen Verstärker (20) umfaßt.
  5. Einbruchdetektor nach einem der vorgenannten Ansprüche, dadurch gekennzeichnet, daß beim Auslösen beider Detektorvorrichtungen ein AND-Baustein (60) ein Signal abgibt, mit Hilfe dessen ein Alarm ausgelöst wird.
  6. Einbruchdetektor nach Anspruch 5, dadurch gekennzeichnet, daß das vom AND-Baustein abgegebene Alarmsignal mit Hilfe einer Speichervorrichtung (65) erhalten wird.
  7. Einbruchdetektor nach Anspruch 6, dadurch gekennzeichnet, daß die Speichervorrichtung zurückgestellt wird, indem die Betriebsspannung abgeschaltet wird.
  8. Einbruchdetektor nach einem der vorgenannten Ansprüche, dadurch gekennzeichnet, daß das Bandpaßfilter der Druckschwankungsdetektor-Vorrichtung eine obere und untere Grenzfrequenz von 10 Hz beziehungsweise 5 Hz hat.
  9. Einbruchdetektor nach einem der vorgenannten Ansprüche, dadurch gekennzeichnet, daß das Bandpaßfilter der Glasbruchdetektor-Vorrichtung eine obere und untere Grenzfrequenz von 12 Khz beziehungsweise 4 Khz hat.
  10. Einbruchdetektor nach einem der Ansprüche 3 bis 9, dadurch gekennzeichnet, daß der Schwellenwert des Triggers so gewählt wird, daß Schwankungen des Raumdrucks, die geringer sind als ±0,3 mbar, die Druckschwankungsdetektor-Vorrichtung nicht auslösen.
  11. Einbruchdetektor nach einem der Ansprüche 4 bis 10, dadurch gekennzeichnet, daß für die vorbestimmte Zeitspanne T1 0,1 s gewählt wird.
  12. Einbruchdetektor nach einem der Ansprüche 1 bis 11, dadurch gekennzeichnet, daß der Verstärker einen Verstärkungsfaktor von 300 hat.
  13. Einbruchdetektor nach einem der vorgenannten Ansprüche, dadurch gekennzeichnet, daß der Druckdetektor und der Glasbruchdetektor in einem gemeinsamen Gehäuse untergebracht sind.
  14. Einbruchdetektor nach einem der vorgenannten Ansprüche, dadurch gekennzeichnet, daß der gesamte Einbruchdetektor in einem einzigen Gehäuse untergebracht ist.
EP91119446A 1990-11-16 1991-11-14 Einbruch-Detektor Expired - Lifetime EP0486018B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4036617A DE4036617A1 (de) 1990-11-16 1990-11-16 Einbruchmelder
DE4036617 1990-11-16

Publications (2)

Publication Number Publication Date
EP0486018A1 EP0486018A1 (de) 1992-05-20
EP0486018B1 true EP0486018B1 (de) 1997-02-12

Family

ID=6418424

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91119446A Expired - Lifetime EP0486018B1 (de) 1990-11-16 1991-11-14 Einbruch-Detektor

Country Status (4)

Country Link
EP (1) EP0486018B1 (de)
JP (1) JPH0620164A (de)
KR (1) KR920010519A (de)
DE (2) DE4036617A1 (de)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE469502B (sv) * 1992-05-12 1993-07-12 Extronic Ab Anordning foer att beroeringsfritt aastadkomma en aktivering av ett eller flera ljusalstrande organ.
FR2694650A1 (fr) * 1992-08-04 1994-02-11 Frizet Christian Analyseur paramétrique en temps réel de choc et d'ouverture.
US5396217A (en) * 1993-02-01 1995-03-07 General Motors Corporation Phase shift analysis for vehicle intrusion detection
KR20030064127A (ko) * 2002-01-26 2003-07-31 이헌상 도어 개폐 감지장치 및 감지방법
KR20030090315A (ko) * 2002-05-22 2003-11-28 박유진 유리문용 보안 장치 및 그 제조 방법
KR20050007998A (ko) * 2003-07-14 2005-01-21 현대자동차주식회사 안테나를 이용한 차량의 글래스 파손 경보 방법
DE102006061052A1 (de) 2006-12-22 2008-07-03 Maschinenfabrik Wifag Falzklappenzylinder
WO2008106809A1 (de) * 2007-03-08 2008-09-12 Glasfreunde Gmbh Vorrichtung zur detektion von glasvandalismus
TWI382366B (zh) * 2008-10-20 2013-01-11 Ind Tech Res Inst 警報系統

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4928085A (en) * 1983-02-23 1990-05-22 Bluegrass Electronics, Inc. Pressure change intrusion detector
DE3412914A1 (de) * 1984-04-05 1985-10-31 base electronic gmbH, 2000 Hamburg Verfahren und vorrichtung zur sicherung von geschlossenen raeumen
GB2171518B (en) * 1985-02-08 1988-09-01 Automated Security Holdings Glass break detector
JPS62197891A (ja) * 1986-02-25 1987-09-01 松下電工株式会社 ガラス破壊検知器
US4853677A (en) * 1988-07-20 1989-08-01 Yarbrough Alfred E Portable intrusion alarm
JPH0256698A (ja) * 1988-08-23 1990-02-26 Central Glass Co Ltd ガラス破損検出装置

Also Published As

Publication number Publication date
JPH0620164A (ja) 1994-01-28
DE4036617A1 (de) 1992-05-21
DE69124661T2 (de) 1997-09-04
KR920010519A (ko) 1992-06-26
DE69124661D1 (de) 1997-03-27
EP0486018A1 (de) 1992-05-20

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