EP0175002B1 - Glass breakage detector - Google Patents
Glass breakage detector Download PDFInfo
- Publication number
- EP0175002B1 EP0175002B1 EP84104873A EP84104873A EP0175002B1 EP 0175002 B1 EP0175002 B1 EP 0175002B1 EP 84104873 A EP84104873 A EP 84104873A EP 84104873 A EP84104873 A EP 84104873A EP 0175002 B1 EP0175002 B1 EP 0175002B1
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- European Patent Office
- Prior art keywords
- evaluation
- signal
- signals
- circuit
- ultrasonic
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- 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 a glass break sensor arrangement, in particular for alarm systems for monitoring against intrusions, with an ultrasound transmitter attached to a glass pane and an ultrasound receiver for engaging or receiving ultrasound waves and with an evaluation circuit with a memory in which the ultrasound Received signal with undisturbed glass pane is written into signal components in a time-resolved manner, which are compared in monitoring mode with the current ultrasound reception signals received in a time-resolved manner in a comparison circuit, whereupon a first evaluation signal is emitted if the two signals do not match.
- Such a glass break sensor arrangement is known from DE-A-29 38 968.
- ultrasonic body waves are sent through the glass pane to be monitored, which are either returned after reflection at the pane edge into the piezo crystal which also serves as a transmitter, or into a second piezo crystal which serves as an independent sound wave receiver .
- Ultrasound waves are emitted periodically, which have a very specific time spectrum after passing through the glass pane.
- the time spectrum of the received ultrasonic wave changes considerably, so that a comparison of the spectra received with the glass pane unbroken and those after a break or damage to the pane hardly provides any information about the state of the glass pane.
- Such an alarm system is referred to as "active" because the sound waves are generated arbitrarily and are coupled into the glass pane.
- a major disadvantage of such active alarm systems is that they are relatively prone to failure and therefore easily trigger false alarms.
- active systems operating with supersonic waves are susceptible to malfunction when moisture occurs. Water is a very good acoustic coupler, so that e.g. if moisture suddenly appears, such as rain, hail or even a glass cleaning, the reflected or received ultrasonic wave is changed so that a false alarm can occur.
- a glass break sensor arrangement is known from DE-A-30 27 283, in which break noise-specific signals are already used for triggering. In addition to this break-noise-specific signal evaluation, a change in reception level is used there, but analog memories deliver the corresponding signals to a comparator for determining the change in reception level. With regard to the ultrasonic transmitter and receiver, this known glass break sensor arrangement has three separate piezo elements, so that the triggering and receiving elements are designed to be relatively complex.
- the invention is therefore based on the object of improving a generic glass break sensor arrangement in such a way that the likelihood of false alarms can be considerably reduced even with a simplified design.
- this object is achieved in a generic glass break sensor arrangement in that a piezoelectric sensor attached to the glass sheet is provided, by means of which mechanical vibrations of the glass sheet are converted into electrical signals, from which typical break frequencies are selected and amplified, the one generate second evaluation signals and that the two evaluation signals are linked in an AND circuit to generate an alarm signal.
- a passive alarm system is thus used and an alarm is only triggered if both systems are activated at the same time.
- the senor used as a passive system is an additional sensor attached to the glass pane, in particular a piezo crystal, the electrical signals of which are selected in such a way that a corresponding alarm signal is emitted by the passive system only when break frequencies typical of the species occur.
- a single piezo crystal element is used as the ultrasonic receiver and transmitter.
- a total of two piezo crystal elements are used in this arrangement, one in the active system as a transmitter and receiver and the other in the passive system as a receiver.
- a catch flip-flop is connected in the active and in the passive measuring channel. which are set when the respective channel is activated.
- a central control unit resets this flip-flop after an adjustable, specific period of time. However, if the two flip-flops are set simultaneously between two resets, the two evaluation signals of the conjunctive conditions are sufficient and an alarm signal is generated in the AND circuit.
- the evaluation circuit preferably has two shift registers into which the digitized, time-resolved signal components are read and which can be alternately connected to the comparison circuit and the input line for the signal components.
- the comparison circuit is preferably an exclusive-OR circuit, in which the signal components of the current ultrasound received signal and those of the previous ultrasound received signal are compared, and if the signals do not match, the comparison circuit gives a pulse to a counter, which a Contact adjuster is connected with which the threshold number of deviations in the counter is adjustable, at which the first evaluation signal is emitted.
- the evaluation signal is entered in the corresponding flip-flop (see above).
- the piezo element 30 shown in FIG. 1 is sound-coupled to the glass pane to be monitored and serves both as a transmitter for the sound waves and as a receiver.
- the ultrasonic waves are transmitted to the glass pane and spread on it.
- the ultrasound waves are reflected on the edges of the glass pane opposite the piezo element 30 and then picked up again by the piezo element 30.
- the electrical signals generated by the piezo element 30 as a function of the collected ultrasound waves are fed to an evaluation unit 34 with a selective bandpass filter and amplitude discriminator.
- the signal spectra of the piezo element 30 are also digitized.
- an additional piezo element 40 is connected to the glass pane to be monitored (not shown), which receives the mechanical vibrations of the glass pane and converts it into electrical signals.
- An evaluation unit is connected downstream of the piezo element 40 and filters out the glass frequencies typical of a break-in.
- the evaluation units 34 and 44 are each followed by a flip-flop 32 or 42, which are set by the evaluation units when they generate a corresponding evaluation signal.
- Both flip-flops 32, 42 are connected to an AND circuit 50, which then sets a further flip-flop 52 if both upstream flip-flops 32, 42 are set simultaneously within a certain time interval.
- the flip-flop 52 is used for alarming and passes on e.g. a potential-free contact to forward the alarm message to the intrusion control panel.
- FIG. 2 shows details of the evaluation circuit 34 connected downstream of the piezo element 30.
- the digitized received signals are input into a comparison circuit 10 via the input line 16.
- the second input of the comparison circuit 10 is connected via the electronic switching means 20 to the output of one of two shift registers 12, 18.
- the shift registers 12, 18 can each be connected alternately to the input line 16 via a switching means 20.
- the one shift register 12 is connected to the input line 16, while the other shift register 18 is connected to the second input of the comparison circuit 10.
- the shift register 18 was connected to the input line 16 in the previous measurement period, so that the previously received ultrasound signal was read into it.
- the current ultrasonic received signal is compared in the comparison circuit 10 with the signal received in the previous measurement period.
- the switching means 20 is switched over, so that the shift register 12 will now be connected to the comparison circuit 10 and the current signal then measured can be compared with the previously measured signal.
- the signal digitized via the line 16 is thus simultaneously read into one of the shift registers 12 or 18 and input into the comparison circuit 10.
- the comparison circuit 10 sends a pulse to the counter 14. After exceeding the number of deviations between the current received signal preselected by the response adjuster 22 and the comparison signal read from one of the shift registers, the flip-flop 32 is set, so that, according to FIG. 1, the AND circuit 50 receives a first positive evaluation signal. If the piezo element 40 simultaneously detects a break frequency that is typical of the type, both inputs of the AND Circuit 50 correspondingly positive so that the alarm message occurs.
- a control circuit 21 (Fig. 2) controls the switching means 20 and serves as a clock for the shift registers 12 and 18 and the counter 14. Furthermore, the two flip-flops 32, 42 are reset periodically after adjustable time periods, so that only then an alarm is triggered is when the two piezo elements 30, 40 simultaneously generate an evaluation signal within a specific, preselectable period of time.
- the sensitivity of the system can be adapted to the ambient conditions either by setting the response adjuster 22 or by preselecting the last-mentioned period of time.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Burglar Alarm Systems (AREA)
Abstract
Description
Die Erfindung betrifft eine Glasbruchsensoran- ördnung, insbesondere für Alarmanlagen zur Überwachung gegen Einbrüche mit einem auf einer Glasscheibe befestigten Ultraschall-Sender und einem Ultraschall-Empfänger zum Einkuppein bzw. Empfangen von Ultraschallwellen und mit einer Auswerteschaltung mit einem Speicher, in dem zunächst das Ultraschall-Empfangssignal bei ungestörter Glasscheibe in Signalkomponenten zeitlich aufgelöst eingeschrieben wird, welche im Überwachungsbetrieb mit den laufend zeitlich aufgelöst empfangenen aktuellen Ultraschall-Empfangssignalen in einer Vergleichsschaltung verglichen werden, worauf bei Nichtübereinstimmung der beiden Signale ein erstes Auswertesignal abgegeben wird.The invention relates to a glass break sensor arrangement, in particular for alarm systems for monitoring against intrusions, with an ultrasound transmitter attached to a glass pane and an ultrasound receiver for engaging or receiving ultrasound waves and with an evaluation circuit with a memory in which the ultrasound Received signal with undisturbed glass pane is written into signal components in a time-resolved manner, which are compared in monitoring mode with the current ultrasound reception signals received in a time-resolved manner in a comparison circuit, whereupon a first evaluation signal is emitted if the two signals do not match.
Eine solche Glasbruchsensoranordnung ist aus der DE-A-29 38 968 bekannt. Bei einem derartigen Alarmsystem werden Ultraschall-Körperwellen durch die zu überwachende Glasscheibe geschickt, weiche entweder nach einer Reflexion an dem Scheibenrand in den auch als Sender dienenden Piezo-Kristall rückgeführt werden oder in einen zweiten Piezo-Kristall gelangen, der als unabhängiger Schallwellen-Empfänger dient.Such a glass break sensor arrangement is known from DE-A-29 38 968. In such an alarm system, ultrasonic body waves are sent through the glass pane to be monitored, which are either returned after reflection at the pane edge into the piezo crystal which also serves as a transmitter, or into a second piezo crystal which serves as an independent sound wave receiver .
Es werden periodisch Ultraschallwellen ausgesendet, welche nach Durchlaufen der Glasscheibe ein ganz bestimmtes Zeit-Spektrum aufweisen. Erfährt die Glasscheibe aber einen Bruch, so ändert sich das ZeitSpektrum der empfangenen Ultraschallwelle erheblich, so daß ein Vergleich der bei ungebrochener Glasscheibe empfangenen Spektren mit denen nach einem Bruch oder einer Beschädigung der Scheibe kaum Aufschluß über den Zustand derselben gibt. Eine solche Alarmanalge wird als "aktiv" bezeichnet, da die Schallwellen willkürlich erzeugt und in die Glasscheibe eingekoppelt werden.Ultrasound waves are emitted periodically, which have a very specific time spectrum after passing through the glass pane. However, if the glass pane experiences a break, the time spectrum of the received ultrasonic wave changes considerably, so that a comparison of the spectra received with the glass pane unbroken and those after a break or damage to the pane hardly provides any information about the state of the glass pane. Such an alarm system is referred to as "active" because the sound waves are generated arbitrarily and are coupled into the glass pane.
Ein wesentlicher Nachteil solcher aktiv arbeitenden Alarmsysteme liegt darin, daß sie relativ störanfällig sind und somit leicht Fehlalarme auslösen. Insbesondere sind mit Überschallwellen arbeitende aktive Systeme störanfällig bei Auftreten von Feuchtigkeit. Wasser ist ein sehr guter akustischer Koppler, so daß z.B. bei plötzlich auftretender Feuchtigkeit, wie Regen, Hagel oder auch einer Glasreinigung, die reflektierte bzw. empfangene Ultraschallwelle verändert wird, so daß ein Fehlalarm auftreten kann.A major disadvantage of such active alarm systems is that they are relatively prone to failure and therefore easily trigger false alarms. In particular, active systems operating with supersonic waves are susceptible to malfunction when moisture occurs. Water is a very good acoustic coupler, so that e.g. if moisture suddenly appears, such as rain, hail or even a glass cleaning, the reflected or received ultrasonic wave is changed so that a false alarm can occur.
Zwar ist aus der DE-A-30 27 283 eine Glasbruchsensor-Anordnung bekannt, bei der bereits Bruchgeräusch-spezifische Signale zu einer Triggerung benutzt werden. Neben dieser Bruchgeräusch-spezifischen Signalauswertung wird dort eine Empfangspegeländerung genutzt, wobei jedoch Analog-Speicher die entsprechenden Signale an einen Komperator zur Feststellung der Empfangspegeländerung liefern. Im Hinblick auf den Ultraschallsender und -empfänger weist diese bekannte Glasbruchsensor-Anordnung drei separate Piezoelemente auf, so daß die Auslöse und Empfangselemente noch relativ aufwendig ausgelegt sind.A glass break sensor arrangement is known from DE-A-30 27 283, in which break noise-specific signals are already used for triggering. In addition to this break-noise-specific signal evaluation, a change in reception level is used there, but analog memories deliver the corresponding signals to a comparator for determining the change in reception level. With regard to the ultrasonic transmitter and receiver, this known glass break sensor arrangement has three separate piezo elements, so that the triggering and receiving elements are designed to be relatively complex.
Ausgehend von dem vorgenannten Stand der Technik liegt daher der Erfindung die Aufgabe zugrunde, eine gattungsgemäße Glasbruchsensor-Anordnung derart zu verbessern, daß auch bei vereinfachter Ausführung die Wahrscheinlichkeit von Fehlalarmen erheblich gesenkt werden kann.Starting from the aforementioned prior art, the invention is therefore based on the object of improving a generic glass break sensor arrangement in such a way that the likelihood of false alarms can be considerably reduced even with a simplified design.
Gemäß der Erfindung wird diese Aufgabe bei einer gattungsgemäßen Glasbruchsensor-Anordnung dadurch gelöst, daß ein piezoelektrischer, auf der Glasscheibe befestigter Fühler vorgesehen ist, mittels welchem mechanische Schwingungen der Glasscheibe in elektrische Signale umgewandelt werden, aus welchen arttypische Bruchfrequenzen selektiert und verstärkt werden, die ein zweites Auswertesignale erzeugen und daß die beiden Auswertesignale in einer UND-Schaltung zur Erzeugung eines Alarmsignals verknüpft werden. Zusätzlich zu dem aktiven Sensorsystem, nämlich dem Sender und dem Empfänger für Ultraschallwellen, wird somit noch ein passives Alarmsystem eingesetzt und ein Alarm wird nur dann ausgelöst, wenn beide Systeme gleichzeitig aktiviert sind.According to the invention, this object is achieved in a generic glass break sensor arrangement in that a piezoelectric sensor attached to the glass sheet is provided, by means of which mechanical vibrations of the glass sheet are converted into electrical signals, from which typical break frequencies are selected and amplified, the one generate second evaluation signals and that the two evaluation signals are linked in an AND circuit to generate an alarm signal. In addition to the active sensor system, namely the transmitter and the receiver for ultrasonic waves, a passive alarm system is thus used and an alarm is only triggered if both systems are activated at the same time.
Als passives System dient gemäß der Erfindung ein zusätzlich auf der Glasscheibe befestigter Fühler, insbesondere ein Piezo-Kristall, dessen elektrische Signale derart selektiert werden, daß nur bei Auftreten von arttypischen Bruchfrequenzen ein entsprechendes Alarmsignal vom passiven System abgegeben wird. Erfindungsgemäß ist vorgesehen, daß als Ultraschallempfänger und -sender ein einziges PiezoKristallelement Verwendung findet. Somit kommen in dieser Anordnung insgesamt zwei Piezo-Kristallelemente zum Einsatz, das eine im aktiven System als Sender und Empfänger und das andere im passiven System als Empfänger.According to the invention, the sensor used as a passive system is an additional sensor attached to the glass pane, in particular a piezo crystal, the electrical signals of which are selected in such a way that a corresponding alarm signal is emitted by the passive system only when break frequencies typical of the species occur. According to the invention, a single piezo crystal element is used as the ultrasonic receiver and transmitter. Thus, a total of two piezo crystal elements are used in this arrangement, one in the active system as a transmitter and receiver and the other in the passive system as a receiver.
Im aktiven als auch im passiven Meßkanal wird jeweils ein Auffang-Flip-Flop nachgeschaltet. welche bei Aktivierung des jeweiligen Kanals gesetzt werden. Eine zentrale Steuereinheit setzt diese Flip-Flop nach einer einstellbaren, bestimmten Zeitspanne jeweils zurück. Erfolgt aber in der Zeitspanne zwischen zwei Rücksetzungen gleichzeitig ein Setzen der beiden Flip-Flop, so genügen die beiden Auswertesignale der konjunktiven Bedingungen und in der UND-Schaltung wird ein Alarmsignal erzeugt.A catch flip-flop is connected in the active and in the passive measuring channel. which are set when the respective channel is activated. A central control unit resets this flip-flop after an adjustable, specific period of time. However, if the two flip-flops are set simultaneously between two resets, the two evaluation signals of the conjunctive conditions are sufficient and an alarm signal is generated in the AND circuit.
Die Auswerteschaltung weist vorzugsweise zwei Schieberegister auf, in welche die digitalisierten, zeitlich aufgelösten Signalkomponenten eingelesen werden und welche abwechselnd mit der Vergleichsschaltung sowie der Eingangsleitung für die Signalkomponenten verbindbar sind. Die Vergleichsschaltung ist dabei vorzugsweise eine Exklusiv-Oder-Schaltung, in welcher jeweils die Signal-Komponenten des aktuellen Ultraschall-Empfangssignales und die des vorangegangenen Ultraschall-Empfangssignales verglichen werden, wobei bei Nichtübereinstimmung der Signale die Vergleichsschaltung einen Impuls auf einen Zähler gibt, welchem ein Ansprecheinsteller nachgeschaltet ist, mit dem die Schwellen-Zahl der Abweichungen im Zähler einstellbar ist, bei der das erste Auswertesignal abgegeben wird. Das Auswertesignal wird in den entsprechenden Flip-Flop eingegeben (siehe oben).The evaluation circuit preferably has two shift registers into which the digitized, time-resolved signal components are read and which can be alternately connected to the comparison circuit and the input line for the signal components. The comparison circuit is preferably an exclusive-OR circuit, in which the signal components of the current ultrasound received signal and those of the previous ultrasound received signal are compared, and if the signals do not match, the comparison circuit gives a pulse to a counter, which a Contact adjuster is connected with which the threshold number of deviations in the counter is adjustable, at which the first evaluation signal is emitted. The evaluation signal is entered in the corresponding flip-flop (see above).
Nachfolgend ist die Erfindung anhand der Zeichnung im einzelnen beschrieben. Dabei zeigt:
- Fig. 1 die erfindungsgemäße Glasbruchsensor- anordnung in einem Prinzip-Schaltbild und
- Fig. 2 ein Blockschaltbild der Auswerteschaltung für die empfangenen Ultraschallwellen.
- 1 shows the glass break sensor arrangement according to the invention in a basic circuit diagram and
- Fig. 2 is a block diagram of the evaluation circuit for the received ultrasonic waves.
Das in Fig. 1 gezeigte Piezoelement30 wird mit der zu überwachenden Glasscheibe schallgekoppelt und dient sowohl als Sender für die Schallwellen als auch als Empfänger. Beim Senden werden die Ultraschallwellen auf die Glasscheibe übertragen und breiten sich auf dieser aus. An dem Piezoelement 30 gegenüberliegenden Kanten der Glasscheibe werden die Ultraschallwellen reflektiert und sodann vom piezoelement 30 wieder aufgefangen. Die von dem Piezoelement 30 in Abhängigkeit von den aufgefangenen Ultraschallwellen erzeugten elektrischen Signale werden einer Auswerteeinheit 34 mit selektiven Bandpaßfilter und Amplitudendiskriminator zugeführt. Auch werden die Signal-Spektren des Piezoelementes 30 digitalisiert.The
Weiterhin ist gemäß Fig. 1 ein zusätzliches Piezoelement 40 mit der zu überwachenden Glasscheibe (nicht gezeigt) verbunden welches die mechanischen, Schwingungen der Glasscheibe empfängt und in elektrische Signale umwandelt. Eine Auswerteeinheit ist dem piezoelement 40 nachgeschaltet und filtert die für einen Einbruch typischen Glasfrequenzen aus. Den Auswerteeinheiten 34 und 44 ist jeweils ein Flip-Flop 32 bzw. 42 nachgeschaltet, welche von den Auswerteeinheiten dann gesetzt werden, wenn diese ein entsprechendes Auswertesignal erzeugen. Beide Flip-Flop 32,42 sind mit einer UND-Schaltung 50 verbunden, welche dann ein weiteres Flip-Flop 52 setzt, wenn beide vorgeschalteten Flip-Flop 32,42 innerhalb eines bestimmten Zeitintervalles gleichzeitig gesetzt sind. Das Flip-Flop 52 dient der Alarmgebung und leitet über z.B. einen potentialfreien Kontakt die Alarmmeldung an die Einbruchmeldezentrale weiter.1, an
In Fig. 2 sind Einzelheiten der dem Piezoelement 30 nachgeschalteten Auswerteschaltung 34 dargestellt. Über die Eingangsleitung 16 werden die digitalisierten Empfangssignale in eine Vergleichsschaltung 10 eingegeben. Der zweite Eingang der Vergleichsschaltung 10 ist über das elektronische Schaltmittel 20 mit dem Ausgang jeweils eines von zwei Schieberegistern 12, 18 verbunden. Die Schieberegister 12, 18 sind eingangsseitig jeweils abwechselnd ebenfalls über ein Schaltmittel 20 mit der Eingangsleitung 16 verbindbar. Bei dem in Fig. 2 gezeigten Zustand ist das eine Schieberegister 12 mit der Eingangs leitung 16 verbunden, während das andere Schieberegister 18 mit dem zweiten Eingang der Vergleichsschaltung 10 verbunden ist. Das Schieberegister 18 war in der vorhergegangenen Meßperiode mit der Eingangsleitung 16 verbunden, so daß in ihm das zuvor empfangene Ultraschallsignal eingelesen ist. Somit wird in dem in Fig. 2 gezeigten Zustand in der Vergleichsschaltung 10 das aktuelle Ultraschall-Empfangssignal mit dem in der vorhergegangenen Meßperiode empfangenen Signal verglichen. In der sich anschließenden Meßperiode wird das Schaltmittel 20 umgeschaltet, so daß das Schieberegister 12 nunmehr mit der Vergleichsschaltung 10 verbunden sein wird und sich das dann gemessene aktuelle Signal mit dem zuvor gemessenen Signal vergleichen läßt. Das über die Leitung 16 digitalisierte Signal wird also jeweils gleichzeitg in eines der Schieberegister 12 oder 18 eingelesen und in die Vergleichsschaltung 10 eingegeben.2 shows details of the
Weichen nun das aktuelle Empfangssignal und das gemessene aus dem Schieberegister 12 bzw. 18 ausgelesene Empfangssignal der vorhergegangenen Meßperiode voneinander ab, so gibt die Vergleichsschaltung 10 einen Impuls auf den Zähler 14. Nach Überschreiten der mittels des Ansprecheinstellers 22 vorgewählten Anzahl von Abweichungen zwischen dem aktuellen Empfangssignal und dem aus einem der Schieberegister ausgelesenen Vergleichssignal wird das Flip-Flop 32 gesetzt, so daß gemäß Fig. 1 die UND-Schaltung, 50 ein erstes positives Auswertesignal erhält.Ermittelt gleichzeitig das Piezoelement 40 eine arttypische Bruchfrequenz, so sind beide Eingänge der UND-Schaltung 50 entsprechend positiv, so daß die Alarmmeldung erfolgt.If the current received signal and the measured received signal of the previous measurement period read from the
Eine Steuerschaltung 21 (Fig. 2) steuert die Schaltmittel 20 und dient als Taktgeber für die Schieberegister 12 und 18 sowie den Zähler 14. Weiterhin werden die beiden Flip-Flop 32,42 periodisch nach einstellbaren Zeitspannen rückgesetzt, so daß nur dann ein Alarm ausgelöst wird, wenn die beiden Piezoelemente 30, 40 innerhalb einer bestimmten, vorwählbaren Zeitspanne gleichzeitig ein Auswertesignal erzeugen. Sowohl durch die Einstellung des Ansprecheinstellers 22 als auch durch die Vorwahl der letztgenannten Zeitspanne läßt sich die Empfindlichkeit des Systems wahlweise den Umgebungsbedingungen anpassen.A control circuit 21 (Fig. 2) controls the switching means 20 and serves as a clock for the
Claims (4)
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP84104873A EP0175002B1 (en) | 1984-04-30 | 1984-04-30 | Glass breakage detector |
| DE8484104873T DE3475126D1 (en) | 1984-04-30 | 1984-04-30 | Glass breakage detector |
| AT84104873T ATE38573T1 (en) | 1984-04-30 | 1984-04-30 | GLASS BREAKAGE SENSOR. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP84104873A EP0175002B1 (en) | 1984-04-30 | 1984-04-30 | Glass breakage detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0175002A1 EP0175002A1 (en) | 1986-03-26 |
| EP0175002B1 true EP0175002B1 (en) | 1988-11-09 |
Family
ID=8191910
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP84104873A Expired EP0175002B1 (en) | 1984-04-30 | 1984-04-30 | Glass breakage detector |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0175002B1 (en) |
| AT (1) | ATE38573T1 (en) |
| DE (1) | DE3475126D1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE456951B (en) * | 1987-03-06 | 1988-11-14 | Lars Eriksson | ALARM DEVICE STEPPED BY A WINDOW CONSTRUCTION AND INCLUDING AT LEAST ONE TRANSMITTER OF ULTRA SOUND |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2312827A1 (en) * | 1975-05-29 | 1976-12-24 | Matsushita Electric Ind Co Ltd | GLASS BREAK DETECTOR |
| JPS52116274A (en) * | 1976-03-25 | 1977-09-29 | Matsushita Electric Ind Co Ltd | Glass plate breakage inspecting apparatus |
| DE2938968A1 (en) * | 1979-09-26 | 1981-07-02 | Siemens AG, 1000 Berlin und 8000 München | ALARM SYSTEM FOR THE PROTECTION OF GLASS AREAS, ESPECIALLY WINDOW DISPLAYS |
| DE3027283A1 (en) * | 1980-07-18 | 1982-02-11 | ABM Elektronik GmbH, 8000 München | Alarm system for glass window panes - has ultrasonic transmission through pane to discriminator circuit coupled to alarm |
-
1984
- 1984-04-30 AT AT84104873T patent/ATE38573T1/en active
- 1984-04-30 EP EP84104873A patent/EP0175002B1/en not_active Expired
- 1984-04-30 DE DE8484104873T patent/DE3475126D1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| ATE38573T1 (en) | 1988-11-15 |
| EP0175002A1 (en) | 1986-03-26 |
| DE3475126D1 (en) | 1988-12-15 |
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