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EP0289641A1 - Security fenee with security wires attached to posts via detectors - Google Patents

Security fenee with security wires attached to posts via detectors Download PDF

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Publication number
EP0289641A1
EP0289641A1 EP87106681A EP87106681A EP0289641A1 EP 0289641 A1 EP0289641 A1 EP 0289641A1 EP 87106681 A EP87106681 A EP 87106681A EP 87106681 A EP87106681 A EP 87106681A EP 0289641 A1 EP0289641 A1 EP 0289641A1
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EP
European Patent Office
Prior art keywords
signal
sensor
circuit
security
alarm
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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.)
Granted
Application number
EP87106681A
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German (de)
French (fr)
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EP0289641B1 (en
Inventor
Harald Dipl.-Ing. Seifert
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Shorrock Ltd
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KTV SICHERHEITSTECHNIK GmbH
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Filing date
Publication date
Application filed by KTV SICHERHEITSTECHNIK GmbH filed Critical KTV SICHERHEITSTECHNIK GmbH
Priority to DE8787106681T priority Critical patent/DE3776899D1/en
Priority to EP87106681A priority patent/EP0289641B1/en
Priority to AT87106681T priority patent/ATE72906T1/en
Priority to IL82831A priority patent/IL82831A0/en
Priority to US07/071,808 priority patent/US4803468A/en
Priority to CA000542193A priority patent/CA1276256C/en
Publication of EP0289641A1 publication Critical patent/EP0289641A1/en
Application granted granted Critical
Publication of EP0289641B1 publication Critical patent/EP0289641B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • G08B13/12—Mechanical actuation by the breaking or disturbance of stretched cords or wires
    • G08B13/122—Mechanical actuation by the breaking or disturbance of stretched cords or wires for a perimeter fence

Definitions

  • the invention relates to a security fence with security wires attached to posts by sensors according to the preamble of claim 1.
  • the evaluation circuit explained there comprises a switch arrangement which connects the individual sensors in succession to a measuring circuit.
  • the measuring circuit successively measures the signal amplitudes of the sensors and forms an average value therefrom.
  • a comparator compares the signal amplitude of each sensor with the mean value and triggers an alarm signal if the difference between the signal amplitude and the mean value exceeds a threshold value only occur with one or a few fuse wires.
  • an alarm signal is not triggered if such slow movements are caused by environmental influences, such as temperature changes, which are effective with a large number of safety wires.
  • This evaluation circuit has the disadvantage that it requires a large computing capacity in the case of a large number of sensors in order to form the mean value from the large number of signal amplitudes.
  • the task is to design the evaluation circuit so that the collection of a large number of signal amplitudes is not is required.
  • the signal from sensor 1 is fed via an amplifier 2 to the inputs of two low-pass filters 3, 4 connected in parallel. These two low-pass filters have different cutoff frequencies from one another.
  • the sensor signal has a typical course that lies within a characteristic frequency spectrum.
  • This frequency spectrum is different from other frequency spectra which have the signal profiles which are caused by other causes when the fuse wires are deflected. Other causes include temperature fluctuations, gusty winds, falling branches and branches.
  • the frequency spectra that arise here are partly above and partly below the frequency spectrum that arises when a safety wire is deflected by a human.
  • the cut-off frequency of the low-pass filter 3 becomes like this chosen that it lies above the frequency spectrum of the sensor signal, which arises when a wire is deflected by a human.
  • the low-pass filter 3 thus allows the entire frequencies to pass through to its cutoff frequency.
  • the other low-pass filter 4 on the other hand, has a cut-off frequency which is at the lower limit of the aforementioned frequency spectrum. This means that this frequency spectrum is not passed.
  • the outputs of the two low-pass filters 3, 4 are connected to a subtraction circuit 5, which forms the difference between the output signals of the two low-pass filters 3, 4.
  • a signal occurs at the output of the subtraction circuit 5, which corresponds to the frequency spectrum of the sensor signal, which arises when a wire is deflected by a human.
  • This signal is fed to the input of a threshold circuit 6. If the output signal of the subtraction circuit 5 exceeds a predetermined threshold value 7, then an alarm is triggered.
  • a signal from the comparator 6 is fed to a first alarm circuit 8.
  • the output of the subtraction circuit 5 is connected to a jump detector 9, ie to a differentiator, which forms the time differential of the output signal of the subtraction circuit. As a result, a rapid signal change is detected. Still the exit of amplifier 2 is connected to a further comparator 10. If the sensor signal exceeds a threshold value 11, then a gate circuit 12 is triggered thereby, which is further controlled by the differentiator 9. If the jump detector 9 generates an output signal corresponding to a rapid change in the sensor signal and if this sensor signal lies above the threshold value 11, corresponding to a high signal amplitude, then the gate circuit 12 generates an alarm signal which is fed to a second alarm circuit 13.
  • the circuit can be designed in such a way that when the two alarm circuits 8, 13 are activated at the same time, the alarm transmission in the first alarm circuit 8 is suppressed.
  • the signal of the sensor 1 is fed to a differentiator 14 via the amplifier 2.
  • This differentiator forms the time differential of the sensor signal supplied.
  • the output signal of the differentiator 14 is fed to a comparator 15.
  • Two threshold values 16 and 17 are present at this comparator 15.
  • the lower threshold value 16 lies at the lower limit of the time differential spectrum which occurs in the frequency spectrum of the sensor signal which arises when a wire is deflected by a human.
  • the upper threshold value 17 lies at the upper limit of the aforementioned time differential spectrum.
  • the comparator 15 lets through signals which lie within this time differential spectrum and which are then fed to the first alarm circuit 8.
  • the output of the differentiator 14 is also connected to the gate circuit 12, the further input of which is connected to the output of the comparator 10, the input of which, as in FIG. 1, is connected to the output of the amplifier 2.
  • the threshold value 11 is again applied to the comparator 10. The operation of this branch corresponds to that of the corresponding branch according to FIG. 1.

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

Abstract

In a security fence in which when the security wires are touched sensors generate signals corresponding to the touching, each sensor (1) is connected to two low-pass filters (3, 4) whose limit frequencies in the one sensor (3) lie above the frequency spectrum of the sensor signal and in the other sensor (4) lie below the frequency spectrum of the sensor signal, which sensor signal occurs as a result of the deflection of a wire brought about by a person. The output signals of the low-pass filters (3, 4) are subtracted from one another in a subtraction circuit (5). If the subtracted output signal of the subtraction circuit (5) exceeds a predetermined threshold value, the alarm signal is triggered. Deflections of the wire due to other causes and thus of a different frequency spectrum do not cause the alarm to be triggered. <IMAGE>

Description

Die Erfindung betrifft einen Sicherungszaun mit über Sensoren an Pfosten befestigten Sicherungsdrähten nach dem Oberbe­griff des Anspruches 1.The invention relates to a security fence with security wires attached to posts by sensors according to the preamble of claim 1.

Ein derartiger Zaun ist in der DE-PS 35 23 872 beschrieben. Die dort erläuterte Auswerteschaltung umfaßt eine Schalter­anordnung, welche die einzelnen Sensoren aufeinanderfolgend mit einer Meßschaltung verbindet. Die Meßschaltung mißt aufeinanderfolgend die Signalamplituden der Sensoren und bildet hieraus einen Mittelwert. Durch einen Komparator wird die Signalamplitude jedes Sensors mit dem Mittelwert verglichen und ein Alarmsignal ausgelöst, wenn die Differenz zwischen der Signalamplitude und dem Mittelwert einen Schwell­wert überschreitet.Hierdurch wird erreicht, daß ein Alarm­signal bereits bei langsamen Bewegungen der Sicherungsdrähte ausgelöst wird, soweit diese langsamen Bewegungen nur bei einem oder wenigen Sicherungsdrähten auftreten. Dagegen wird ein Alarmsignal nicht ausgelöst, wenn solche langsamen Bewegungen durch Umwelteinflüsse bewirkt werden, wie beispiels­weise durch Temperaturänderungen, die bei einer Vielzahl von Sicherungsdrähten wirksam werden.Such a fence is described in DE-PS 35 23 872. The evaluation circuit explained there comprises a switch arrangement which connects the individual sensors in succession to a measuring circuit. The measuring circuit successively measures the signal amplitudes of the sensors and forms an average value therefrom. A comparator compares the signal amplitude of each sensor with the mean value and triggers an alarm signal if the difference between the signal amplitude and the mean value exceeds a threshold value only occur with one or a few fuse wires. On the other hand, an alarm signal is not triggered if such slow movements are caused by environmental influences, such as temperature changes, which are effective with a large number of safety wires.

Bei dieser Auswerteschaltung ist nachteilig , daß sie bei einer Vielzahl von Sensoren eine große Rechnerkapazität benötigt, um aus der Vielzahl von Signalamplituden den Mittel­wert zu bilden.This evaluation circuit has the disadvantage that it requires a large computing capacity in the case of a large number of sensors in order to form the mean value from the large number of signal amplitudes.

Es besteht die Aufgabe, die Auswerteschaltung so auszubilden, daß das Sammeln einer Vielzahl von Signalamplituden nicht erforderlich ist.The task is to design the evaluation circuit so that the collection of a large number of signal amplitudes is not is required.

Gelöst wird diese Aufgabe nach den kennzeichnenden Merkmalen der Ansprüche 1 und 3, die zwei Lösungswege aufzeigen. Die weiteren Ansprüche geben zweckmäßige Ausgestaltungen dieser Lösungswege an.This object is achieved according to the characterizing features of claims 1 and 3, which show two approaches. The further claims indicate expedient configurations of these solutions.

Die Erfindung wird nachfolgend anhand der Zeichnung näher erläutert. Diese zeigt in

  • Fig. 1 ein Blockschaltbild zur Erläuterung des ersten Lösungswegs und
  • Fig. 2 ein Blockschaltbild zur Erläuterung des zweiten Lösungswegs.
The invention is explained below with reference to the drawing. This shows in
  • Fig. 1 is a block diagram for explaining the first approach and
  • Fig. 2 is a block diagram for explaining the second approach.

Gemäß Fig. 1 wird das Signal des Sensors 1 über einen Ver­stärker 2 den Eingängen zweier parallel geschalteter Tief­passfilter 3, 4 zugeführt. Diese beiden Tiefpassfilter weisen zueinander unterschiedliche Grenzfrequenzen auf.1, the signal from sensor 1 is fed via an amplifier 2 to the inputs of two low-pass filters 3, 4 connected in parallel. These two low-pass filters have different cutoff frequencies from one another.

Wird ein Sicherungsdraht von einem Menschen berührt und damit ausgelenkt, dann weist das Sensorsignal einen typischen Verlauf auf, der innerhalb eines characteristischen Frequenz­spektrums liegt. Dieses Frequenzspektrum ist unterschiedlich zu anderen Frequenzspektren, welche die Signalverläufe auf­weisen, die bei einer Auslenkung der Sicherungsdrähte aus anderen Ursachen bewirkt werden. Andere Ursachen sind bei­spielsweise Temperaturschwankungen, böige Winde, herabfal­lende Zweige und Äste. Die Frequenzspektren, die hierbei entstehen, liegen zum Teil oberhalb und zum Teil unterhalb des Frequenzspektrums, das bei einer durch einen Menschen bewirkten Auslenkung eines Sicherungsdrahtes entsteht.If a safety wire is touched by a person and thus deflected, then the sensor signal has a typical course that lies within a characteristic frequency spectrum. This frequency spectrum is different from other frequency spectra which have the signal profiles which are caused by other causes when the fuse wires are deflected. Other causes include temperature fluctuations, gusty winds, falling branches and branches. The frequency spectra that arise here are partly above and partly below the frequency spectrum that arises when a safety wire is deflected by a human.

Um das von einem Menschen bewirkte Frequenzspektrum zu er­fassen, wird die Grenzfrequenz des Tiefpassfilters 3 so gewählt, daß sie oberhalb des Frequenzspektrums des Sensor­signals liegt, das bei einer durch einen Menschen bewirkten Auslenkung eines Drahtes entsteht. Der Tiefpassfilter 3 läßt also die gesamten Frequenzen bis zu seiner Grenzfrequenz durch. Der andere Tiefpassfilter 4 dagegen weist eine Grenz­frequenz auf, die an der Untergrenze des vorgenannten Fre­quenzspektrums liegt. Dies bedeutet, daß dieses Frequenz­spektrum nicht durchgelassen wird.In order to record the frequency spectrum caused by a human being, the cut-off frequency of the low-pass filter 3 becomes like this chosen that it lies above the frequency spectrum of the sensor signal, which arises when a wire is deflected by a human. The low-pass filter 3 thus allows the entire frequencies to pass through to its cutoff frequency. The other low-pass filter 4, on the other hand, has a cut-off frequency which is at the lower limit of the aforementioned frequency spectrum. This means that this frequency spectrum is not passed.

Die Ausgänge der beiden Tiefpassfilter 3, 4 sind verbunden mit einer Subtraktionsschaltung 5, welche die Differenz der Ausgangssignale der beiden Tiefpassfilter 3, 4 bildet. Auf diese Weise tritt am Ausgang der Subtraktionsschaltung 5 ein Signal auf, das dem Frequenzspektrum des Sensorsignals entspricht, das bei einer durch einen Menschen bewirkten Auslenkung eines Drahts entsteht. Dieses Signal wird dem Eingang einer Schwellwertschaltung 6 zugeführt. Übersteigt das Ausgangssignal der Subtraktionsschaltung 5 einen vorge­gebenen Schwellwert 7, dann findet eine Alarmauslösung statt. Hierbei wird ein Signal vom Komparator 6 einer ersten Alarm­schaltung 8 zugeführt.The outputs of the two low-pass filters 3, 4 are connected to a subtraction circuit 5, which forms the difference between the output signals of the two low-pass filters 3, 4. In this way, a signal occurs at the output of the subtraction circuit 5, which corresponds to the frequency spectrum of the sensor signal, which arises when a wire is deflected by a human. This signal is fed to the input of a threshold circuit 6. If the output signal of the subtraction circuit 5 exceeds a predetermined threshold value 7, then an alarm is triggered. Here, a signal from the comparator 6 is fed to a first alarm circuit 8.

Daneben ist es wünschenswert, einen sogenannten technischen Alarm auszulösen, wenn beispielsweise ein schwerer Ast auf einen Sicherungsdraht aufschlägt und dort hängen bleibt. Hierbei ist es dann erforderlich, bei einer Inspektion des Zaunes den Ast vom Draht zu entfernen. Das in einem solchen Fall auftretende Signal ändert sich sehr rasch und weist eine große Amplitude auf. Es durchläuft das Frequenzspektrum des Sensorsignals, das bei einer durch einen Menschen be­wirkten Auslenkung des Drahts entsteht.In addition, it is desirable to trigger a so-called technical alarm if, for example, a heavy branch hits a safety wire and gets caught there. It is then necessary to remove the branch from the wire during an inspection of the fence. The signal occurring in such a case changes very quickly and has a large amplitude. It traverses the frequency spectrum of the sensor signal, which arises when the wire is deflected by a human.

Um diesen Fall zu erfassen, ist der Ausgang der Subtraktions­schaltung 5 mit einem Sprungdetektor 9 verbunden, d.h. mit einem Differentiator, der das Zeitdifferential des Ausgangs­signals der Subtraktionsschaltung bildet. Hierdurch wird eine rasche Signaländerung erfaßt. Weiterhin ist der Ausgang des Verstärkers 2 mit einem weiteren Komparator 10 verbunden. Übersteigt das Sensorsignal einen Schwellwert 11, dann wird hierdurch eine Torschaltung 12 angesteuert, welche weiterhin vom Differentiator 9 angesteuert wird. Erzeugt der Sprung­detektor 9 ein Ausgangssignal entsprechend einer raschen Änderung des Sensorsignals und liegt dieses Sensorsignal oberhalb des Schwellwertes 11, entsprechend einer hohen Signalamplitude, dann erzeugt die Torschaltung 12 ein Alarm­signal, das einer zweiten Alarmschaltung 13 zugeführt wird. Die Schaltung kann so ausgebildet sein, daß bei gleichzeitiger Ansteuerung der beiden Alarmschaltungen 8, 13 die Alarm­weitergabe bei der ersten Alarmschaltung 8 unterdrückt wird.In order to detect this case, the output of the subtraction circuit 5 is connected to a jump detector 9, ie to a differentiator, which forms the time differential of the output signal of the subtraction circuit. As a result, a rapid signal change is detected. Still the exit of amplifier 2 is connected to a further comparator 10. If the sensor signal exceeds a threshold value 11, then a gate circuit 12 is triggered thereby, which is further controlled by the differentiator 9. If the jump detector 9 generates an output signal corresponding to a rapid change in the sensor signal and if this sensor signal lies above the threshold value 11, corresponding to a high signal amplitude, then the gate circuit 12 generates an alarm signal which is fed to a second alarm circuit 13. The circuit can be designed in such a way that when the two alarm circuits 8, 13 are activated at the same time, the alarm transmission in the first alarm circuit 8 is suppressed.

Beim zweiten Lösungsweg gemäß Fig. 2 wird das Signal des Sensors 1 über den Verstärker 2 einem Differentiator 14 zugeführt. Dieser Differentiator bildet das Zeitdifferential des zugeführten Sensorsignals. Das Ausgangssignal des Dif­ferentiators 14 wird einem Komparator 15 zugeführt. An diesem Komparator 15 stehen zwei Schwellwerte 16 und 17 an. Der untere Schwellwert 16 liegt an der Untergrenze des Zeit­differentialspektrums, das bei dem Frequenzspektrum des Sensorsignals auftritt, das bei einer durch einen Menschen bewirkten Auslenkung eines Drahtes entsteht. Der obere Schwell­wert 17 dagegen liegt an der Obergrenze des vorgenannten Zeitdifferentialspektrums. Der Komparator 15 läßt solche Signale durch, die innerhalb dieses Zeitdifferentialspektrums liegen, die dann der ersten Alarmschaltung 8 zugeführt werden.In the second approach according to FIG. 2, the signal of the sensor 1 is fed to a differentiator 14 via the amplifier 2. This differentiator forms the time differential of the sensor signal supplied. The output signal of the differentiator 14 is fed to a comparator 15. Two threshold values 16 and 17 are present at this comparator 15. The lower threshold value 16 lies at the lower limit of the time differential spectrum which occurs in the frequency spectrum of the sensor signal which arises when a wire is deflected by a human. In contrast, the upper threshold value 17 lies at the upper limit of the aforementioned time differential spectrum. The comparator 15 lets through signals which lie within this time differential spectrum and which are then fed to the first alarm circuit 8.

Zur Auslösung des vorgenannten technischen Alarms ist der Ausgang des Differentiators 14 weiterhin verbunden mit der Torschaltung 12, deren weiterer Eingang mit dem Ausgang des Komparators 10 verbunden ist, dessen Eingang wie bei Fig. 1 mit dem Ausgang des Verstärkers 2 verbunden ist. Am Komparator 10 liegt wiederum der Schwellwert 11 an. Die Arbeitsweise dieses Zweigs entspricht derjenigen, des ent­sprechenden Zweigs nach Fig. 1.To trigger the aforementioned technical alarm, the output of the differentiator 14 is also connected to the gate circuit 12, the further input of which is connected to the output of the comparator 10, the input of which, as in FIG. 1, is connected to the output of the amplifier 2. The threshold value 11 is again applied to the comparator 10. The operation of this branch corresponds to that of the corresponding branch according to FIG. 1.

Claims (4)

1. Sicherungszaun mit über Sensoren an Pfosten befestigten Sicherungsdrähten und einer mit den Sensoren verbundenen elektronischen Auswerteschaltung, die ein Alarmsignal aus­löst, wenn einer der Sensoren eine Berührung des mit ihm verbundenen Sicherungsdrahts signalisiert, wobei jeder Sensor ein mit einem Pfosten verbundenes Gehäuse, ein mit einem Sicherungsdraht verbundenes Halteteil und einen zwischen Gehäuse und Halteteil angeordneten Wandler auf­weist, der ein zur Stellung des Halteteils etwa proportion­ales Signal erzeugt, dadurch gekennzeichnet, daß bei der Auswerteschaltung jeder Sensor (1) an ein erstes und ein zweites Tiefpassfilter (3, 4) angeschlossen ist, die zueinander unterschiedliche Grenzfrequenzen aufweisen, wobei die eine Grenzfrequenz oberhalb und die andere Grenz­frequenz unterhalb des Frequenzspektrums des Sensorsignals liegt, das bei einer durch einen Menschen bewirkten Aus­lenkung des Drahts entsteht, die Ausgänge der Tiefpass­filter (3, 4) mit einer Subtraktionsschaltung (5) verbunden sind, welche die Differenz der Ausgangssignale der Tief­passfilter (3, 4) bildet und das Ausgangssignal der Sub­traktionsschaltung (5) einem ersten Komparator (6) zuge­führt wird, der Ausgangssignale oberhalb einer vorgegebenen Amplitude einer ersten Alarmschaltung (8) zuführt.1.Safety fence with safety wires attached to posts by sensors and an electronic evaluation circuit connected to the sensors which triggers an alarm signal when one of the sensors signals a touch of the security wire connected to it, each sensor a housing connected to a post, one with a Safety wire connected holding part and a transducer arranged between the housing and the holding part, which generates a signal which is approximately proportional to the position of the holding part, characterized in that, in the evaluation circuit, each sensor (1) is connected to a first and a second low-pass filter (3, 4) , which have different cut-off frequencies to each other, one cut-off frequency above and the other cut-off frequency below the frequency spectrum of the sensor signal that occurs when the wire is deflected by a human, the outputs of the low-pass filters (3, 4) with a subtraction scarf device (5) are connected, which forms the difference between the output signals of the low-pass filter (3, 4) and the output signal of the subtraction circuit (5) is fed to a first comparator (6) which supplies output signals above a predetermined amplitude to a first alarm circuit (8) . 2. Sicherungszaun nach Anspruch 1, dadurch gekenn­zeichnet, daß jeder Sensor (1) an einen zweiten Komparator (10) angeschlossen ist, der Sensorsignale ober­halb einer vorgegebenen Amplitude einem Eingang einer Tor­schaltung (12) zuführt, das Ausgangssignal der Subtraktions­schaltung (5) einem Differenziator (9) zugeführt wird, dessen Ausgangssignal das Zeitdifferential des Ausgangs­signals der Subtraktionsschaltung (5) ist und das einem weiteren Eingang der Torschaltung (12) zugeführt wird, die eine zweite Alarmschaltung (13) ansteuert, wenn an beiden Eingängen ein Signal auftritt.2. Security fence according to claim 1, characterized in that each sensor (1) is connected to a second comparator (10) which supplies sensor signals above a predetermined amplitude to an input of a gate circuit (12), the output signal of the subtraction circuit (5) to a differentiator (9) is supplied, the output signal of which is the time differential of the output signal of the subtraction circuit (5) and which is fed to a further input of the gate circuit (12) which drives a second alarm circuit (13), if at both A signal occurs at the inputs. 3. Sicherungszaun mit über Sensoren an Pfosten befestigten Sicherungsdrähten und einer mit den Sensoren verbundenen elektronischen Auswerteschaltung, die ein larmsignal auslöst, wenn einer der Sensoren eine Berührung des mit ihm verbundenen Sicherungsdrahts signalisiert, wobei jeder Sensor ein mit einem Pfosten verbundenes Gehäuse, ein mit einem Sicherungsdraht verbundenes Halteteil und einen zwischen Gehäuse und Halteteil angeordneten Wandler aufweist, der ein zur Stellung des Halteteils etwa proportionales Signal erzeugt, dadurch gekennzeichnet, daß bei der Auswerteschaltung jeder Sensor (1) an einen Differentiator (14) angeschlossen ist, dessen Ausgangssignal das Zeit­differential des Sensorsignals ist, dieses Ausgangs signal einem Komparator (15) zugeführt wird, der Aus­gangssignale durchläßt, die bei einem Frequenzspektrum des Sensorsignals auftreten, das bei einer durch einen Menschen bewirkten Auslenkung des Drahts entsteht und dieses Ausgangssignal einer ersten Alarmschaltung (8) zugeführt wird.3.Safety fence with safety wires attached to posts by sensors and an electronic evaluation circuit connected to the sensors, which triggers an alarm signal if one of the sensors signals a touch of the security wire connected to it, each sensor a housing connected to a post, one with a Safety wire connected holding part and a transducer arranged between the housing and holding part, which generates a signal which is approximately proportional to the position of the holding part, characterized in that in the evaluation circuit each sensor (1) is connected to a differentiator (14), the output signal of which is the time differential of the Sensor signal is, this output signal is fed to a comparator (15) which passes output signals which occur at a frequency spectrum of the sensor signal which occurs when the wire is deflected by a human, and this output signal of a first alarm circuit (8) is fed. 4. Sicherungszaun nach Anspruch 3, dadurch gekenn­zeichnet, daß das Ausgangssignal des Differentiators (14) einem Eingang einer Torschaltung (12) zugeführt wird, der Sensor mit einem weiteren Komparator (10) verbunden ist, der Sensorsignale oberhalb einer vorge­gebenen Amplitude einem weiteren Eingang der Torschal­tung (12) zuführt, die eine zweite Alarmschaltung (13) ansteuert, wenn an beiden Eingängen ein Signal auftritt.4. Security fence according to claim 3, characterized in that the output signal of the differentiator (14) is fed to an input of a gate circuit (12), the sensor is connected to a further comparator (10), the sensor signals above a predetermined amplitude of another input Feeds gate circuit (12) which controls a second alarm circuit (13) when a signal occurs at both inputs.
EP87106681A 1987-05-08 1987-05-08 Security fenee with security wires attached to posts via detectors Expired - Lifetime EP0289641B1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
DE8787106681T DE3776899D1 (en) 1987-05-08 1987-05-08 SECURING FENCE WITH OVER SENSORS SECURED WIRES.
EP87106681A EP0289641B1 (en) 1987-05-08 1987-05-08 Security fenee with security wires attached to posts via detectors
AT87106681T ATE72906T1 (en) 1987-05-08 1987-05-08 SECURITY FENCE WITH SAFETY WIRES FIXED VIA SENSORS ON POST.
IL82831A IL82831A0 (en) 1987-05-08 1987-06-09 Safety fence with safety wires connected to posts via sensors
US07/071,808 US4803468A (en) 1987-05-08 1987-07-10 Security fence with security wires fastened to posts via sensors
CA000542193A CA1276256C (en) 1987-05-08 1987-07-15 Security fence with fuse wires fastened to posts via sensors

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP87106681A EP0289641B1 (en) 1987-05-08 1987-05-08 Security fenee with security wires attached to posts via detectors

Publications (2)

Publication Number Publication Date
EP0289641A1 true EP0289641A1 (en) 1988-11-09
EP0289641B1 EP0289641B1 (en) 1992-02-26

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EP87106681A Expired - Lifetime EP0289641B1 (en) 1987-05-08 1987-05-08 Security fenee with security wires attached to posts via detectors

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US (1) US4803468A (en)
EP (1) EP0289641B1 (en)
AT (1) ATE72906T1 (en)
CA (1) CA1276256C (en)
DE (1) DE3776899D1 (en)

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ATE72906T1 (en) 1992-03-15
US4803468A (en) 1989-02-07
EP0289641B1 (en) 1992-02-26
DE3776899D1 (en) 1992-04-02
CA1276256C (en) 1990-11-13

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