EP0208093B1 - Clôture avec fils de sécurité fixés à des poteaux par l'intermédiaire de détecteurs - Google Patents

Clôture avec fils de sécurité fixés à des poteaux par l'intermédiaire de détecteurs Download PDF

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Publication number
EP0208093B1
EP0208093B1 EP86106644A EP86106644A EP0208093B1 EP 0208093 B1 EP0208093 B1 EP 0208093B1 EP 86106644 A EP86106644 A EP 86106644A EP 86106644 A EP86106644 A EP 86106644A EP 0208093 B1 EP0208093 B1 EP 0208093B1
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EP
European Patent Office
Prior art keywords
signal
fence
output
input
circuit
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
EP86106644A
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German (de)
English (en)
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EP0208093A2 (fr
EP0208093A3 (en
Inventor
Manfred Sticksel
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.)
Shorrock Ltd
Original Assignee
KTV SICHERHEITSTECHNIK GmbH
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 KTV SICHERHEITSTECHNIK GmbH filed Critical KTV SICHERHEITSTECHNIK GmbH
Priority to AT86106644T priority Critical patent/ATE80747T1/de
Publication of EP0208093A2 publication Critical patent/EP0208093A2/fr
Publication of EP0208093A3 publication Critical patent/EP0208093A3/de
Application granted granted Critical
Publication of EP0208093B1 publication Critical patent/EP0208093B1/fr
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 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 being a housing connected to a post with a securing 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.
  • Such a fence is described in DE-A 25 42 544.
  • a piezo transducer acting as a transmitter and a receiver is connected to the ends of each security wire.
  • a power amplifier is interposed between the transmitter of a safety wire and the receiver of an adjacent safety wire.
  • An electronic evaluation circuit is connected between an amplifier and a receiver.
  • Each transmitter brings its associated safety wire to swing. This results in a resulting oscillation from all of the safety wires, the malfunction of which is detected by the electronic evaluation circuit.
  • Such a fault occurs, for example, when one of the safety wires is touched and its natural vibration is thus disturbed.
  • This known fence has a number of disadvantages. Since a power amplifier is arranged between the transmitters and receivers, a considerable amount of wiring is required to feed the power amplifiers. The main disadvantage is that the false alarm rate is relatively high. In gusty wind, for example, the frequency of the resulting vibration can change significantly, which leads to an alarm message. The same applies if, for example, fallen branches and branches of trees get caught in the fence and touch the safety wires. Extremely high and low temperatures cause further detuning of the oscillation loop, since this causes the fuse wires to change their length and thus their natural frequency.
  • fence systems are known whose sensors consist of switches. These switches are designed so that there is no contact with slow movements of the safety wires, but this occurs when the safety wire is moved rapidly, which is the case when a person tries to climb the fence and comes into contact with a safety wire.
  • the disadvantage here is that the amount of movement of the safety wire, from which contact occurs, is difficult to adjust. There is then the danger that contact will occur in some of the sensors in a gusty wind and a false alarm will be triggered. It is also possible to overcome such a fence, if care is taken that only very slow movements are exerted on the safety wires.
  • the transducers 11, 12 ... 1 n all or a group of sensors of the fence are electrically connected on the one hand to a common line 2.
  • This common line 2 is formed by the fuse wires which are electrically connected to one another.
  • the respective other ends of the converter 1 are connected via separate lines 3 1, 3 2 ... 3 n to the evaluation circuit.
  • each line 3 is assigned a switch 4 1, 4 2 ... 4 n .
  • These are electronic switches which are successively closed and opened, which is controlled by a clock generator 5. From the clock generator, the switch 4 1, then the switch 4 2, etc., and finally the switch 4 n, and then the switch 4 1 is closed again.
  • One side of the switches 4 are connected to a common line 6. If the transducers 1 are strain gauges, a current source 7 and a measuring circuit 8 are connected in series between the lines 2 and 6.
  • the transducers 1 are piezo-oxide transducers, then a high resistance 9 is connected between the lines 2 and 6 and a measuring circuit 10 is connected in parallel with them. In this case, the battery 7 and the measuring circuit 8 are then omitted.
  • the output of the measuring circuit 8 or 10 is connected to the input of an analog-digital converter 11. Its output is connected to the input of a shift register 12.
  • This shift register 12 has as much individual memory s 1 ... s n as converter 1 and the evaluation circuit are connected.
  • the output of the last memory s n of the shift register 12 is connected to a buffer memory 13.
  • This buffer memory 13 is in turn connected to a summer 14 which carries out the averaging.
  • the input store s1 of the shift register and the average output of the summer 14 are connected to a comparator circuit 15.
  • the buffer store 13 can also be connected to this comparator circuit 15.
  • the output of the comparator 15 is connected to an identification circuit 16, to which the clock generator 5 is also connected.
  • Another output of the comparator circuit 15 can be connected to a decision circuit 17, to which pulses from the clock generator 5 are also fed. Its output is then also connected to the identification circuit 16.
  • the transducers 1 are strain gauges, their respective resistance value is determined by a current measurement in the measuring circuit 8. If it is a piezo-oxide converter, the respective voltage is determined by the measuring circuit 10.
  • Each determined signal amplitude is digitized and entered into the input register s 1 of the shift register 12. With the entry in the register s1, the value in the output register s n is output into the buffer 13. The value of the signal amplitude entered in the input register s 1 comes from the same converter 1 as the value of the signal amplitude output from the output register s n , which was determined in the previous cycle of actuation of the switch 4.
  • the switch 42 is closed and the signal amplitude of the converter 12 is thus fed into the register s1
  • the value of the signal amplitude is output from the output register s n and fed into the buffer memory 13, which was detected by the converter 12 during the previous sampling cycle when the switch 42 was actuated.
  • the signal amplitude value stored in the buffer 13 and output by the output register s n is subtracted from the sum ⁇ stored in the summer 14, while the signal amplitude value newly entered in the input register s 1 is added to the sum stored in the summer 14.
  • the initial sum, which is stored in the sum memory 14, is obtained after the evaluation circuit has been switched on during the first cycle of actuation of the switches 4, in which the signal amplitude values of all transducers 1 are successively input into the summer 14, while the connection between the output register s n and the accumulator 14 is interrupted.
  • the previously described method of operation ensures that the sum of all signal amplitude values of the transducers 1 stored in the sum memory 14 is up to date.
  • the intermediate memory 13 is combined with an inverter which converts the value output by the output register s n to a minus value.
  • the summer 14 has an upward and a downward input, then the buffer 13 is connected to the downward input and the input register s 1 is connected to the upward input.
  • the summer 14 is combined with a divider which divides the sum ⁇ of all signal amplitudes by the number n of all converters 1 1 ... 1 n .
  • a divider which divides the sum ⁇ of all signal amplitudes by the number n of all converters 1 1 ... 1 n .
  • This comparator 15 will continue to be recorded and entered into the input register s 1 Signal amplitude value supplied.
  • This signal amplitude value is compared with the mean value. If this mean value is exceeded or undershot by a first threshold value, an alarm signal is generated which is fed into the identification circuit. Since this identification circuit is connected to the clock generator 5, it can determine which converter 1 and the actuation of the associated switch 4 have determined a signal amplitude that is too high or too low.
  • the identification circuit 16 can thus indicate the safety wire from which the alarm was triggered.
  • the transducer of a sensor has too high or too low a signal amplitude that exceeds or falls below the first threshold value range as a result of environmental influences (i.e. not by touching a safety wire), for example if the associated safety wire is exposed to full solar radiation while the remaining security wires are in the shade.
  • the procedure is preferably such that the alarm signal generated by the comparator 15 is not forwarded directly to the identity circuit 16. Rather, this alarm signal has the effect that the value stored in the buffer 13 is also stored in the comparator 15 when the alarm signal occurs. This stored value is compared with the newly determined signal amplitude of the same converter 1 in the following sampling period and the result is supplied to the decision circuit 17.
  • a corresponding procedure is used when snow accumulations falling from the fence strike a safety wire, as a result of which the transducer of the assigned sensor has an excessively high or too low signal amplitude.
  • the alarm signal is not fed directly to the identity circuit 16, but serves to store the value stored in the buffer memory 13, which is compared over the following two or three sampling periods with the newly determined signal amplitudes of the same converter. It is determined whether the difference between the stored value and the newly determined signal amplitude exceeds a third threshold value. The result of this comparison is also fed to the decision circuit 17, which forwards the alarm signal to the identity circuit 16 if, over these two or three sampling periods, the signal amplitude of this converter does not return to the original value retrieved from the buffer store 13 (see FIG. 4), provided the case described above (see FIG. 3) is not recorded.
  • the sensor shown in Fig. 2 has a cup-shaped cylindrical housing 20 which is made of plastic and which is fixedly mounted on a post of the fence.
  • the open end of the housing is slipped over by a likewise cylindrical, cup-shaped sleeve 21, which is made of a flexible material, such as rubber.
  • a bolt-shaped holding part 22, which has a flange-like head and an inner bore, is passed through this sleeve 21.
  • a screw 23, which is firmly connected to the safety wire 2 can be screwed into this inner bore.
  • This safety wire is stretched between two further posts with the interposition of a spring.
  • a nut can be screwed onto the inner shoulder 24 of the holding part.
  • the holding part On the inside, the holding part has a pin 25 which is provided with an incision.
  • a flat bronze spring 26 which carries a strain gauge 27.
  • the lower end of the strain gauge is inserted into the slot of a metal disk 28 and soldered to this metal disk, the outer diameter of which corresponds approximately to the inner diameter of the housing 20.
  • the ends of the strain gauge extend to a connecting plate 29, from which the connecting lines between the sleeve and the housing are guided to the outside.
  • One of the lines is connected to the safety wire 2, while the other line 3 leads to a switch 4 of the electronic evaluation circuit.
  • a piezo oxide converter or a Hall generator can also be provided, in which case a permanent magnet is additionally arranged in the housing 20.
  • FIGS. 3 and 4 show the comparisons of the signal amplitudes carried out by the comparator 13. These comparisons are carried out in successive sampling periods at the sampling times T1, T2..T m . These are signals from the same sensor 1, the signal A 1 detected at the sampling time T 1 has an amplitude which exceeds the mean value 0 1 by the first threshold value ⁇ 1. Exceeding the upper threshold 31 represents the first test criterion. The following description of FIGS. 3 and 4 also applies mutatis mutandis in the event that the signal A 1 detected at the time of sampling T 1 falls below the lower threshold 32.
  • the procedure is as shown in FIG. 3, on the other hand, if the difference is greater than the third threshold value ⁇ 3, then the procedure is as shown in Fig. 4 (second test criterion) .
  • the signal amplitude obtained at this sampling time T is compared with the signal amplitude obtained in the previous sampling time T.
  • the signal amplitude Aampl sampled at this time is compared with the signal amplitude A4 obtained at time T faux.
  • the difference D between the signal amplitude A m determined at this time and the previously determined signal amplitude A m-1 exceeds the second threshold value ⁇ 2
  • the alarm signal that was generated at time T 1 is now supplied to the identification circuit 16 , and the alarm is generated.
  • Fig. 3 occurs when, for example, the safety wire connected to the sensor, the signals of which are shown in Fig. 3, is exposed to solar radiation, so that the signals of this sensor exceed the upper threshold 31 while the remaining safety wires are in the shade.
  • T m there is a sudden change between the signals of successive sampling times, which means that the safety wire has been touched.
  • the alarm system does not speak slowly to environmental reasons changes taking place in the signals, even if these signals exceed or fall below the upper or lower threshold value limits 31, 32, but a signal is triggered immediately if an unsteady change occurs, for example as a result of touching the safety wire.
  • Has been the second test criterion at time T1 determined that the difference in signal amplitudes between the signals A1 and A0 exceeds the third threshold ⁇ 3, then it is determined during the two following sampling times T2 and T3 whether this state is maintained at the sampling times T2 and T3. If this is the case, then an alarm signal from comparator 15 of identification circuit 16 is supplied at time T 3 and an alarm is triggered. On the other hand, if the amplitude of the signal A3 at the time T3 again approximates the amplitude of the signal A0, then it is prevented that the alarm signal generated at the time T1 is supplied to the identification circuit 16. The time between the times T1 and T3 is less than a second. This means that short-term signal changes caused by the environment, for example as a result of the drop in snow accumulations, do not trigger a signal, but touching a safety wire when the fence is crossed causes a signal.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)
  • Fencing (AREA)
  • Refuge Islands, Traffic Blockers, Or Guard Fence (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Claims (13)

  1. Clôture munie de fils de sécurité (2) fixés à des poteaux par l'intermédiaire de détecteurs, ainsi que d'un circuit électronique d'interprétation qui est raccordé aux détecteurs et déclenche un signal d'alarme lorsque l'un des détecteurs signale une venue en contact avec le fil de sécurité (2) relié à ce détecteur, chaque détecteur comprenant un boîtier (20) relié à un poteau, une pièce de retenue reliée à un fil de sécurité (2), ainsi qu'un convertisseur (26, 27) interposé entre le boîtier (20) et la pièce de retenue (22), et engendrant un signal sensiblement proportionnel à la position de la pièce de retenue, caractérisée par le fait que le circuit d'interprétation englobe un dispositif de commutation (4, 5) qui raccorde successivement les détecteurs individuels à un circuit mesureur (8, 10) ; le circuit mesureur (8, 10) mesure l'amplitude du signal de chaque détecteur ; les amplitudes des signaux sont appliquées à un circuit (14) formant une valeur moyenne (0̸) ; et il est prévu un circuit comparateur (15) qui compare l'amplitude du signal de chaque détecteur à la valeur moyenne (0̸), puis déclenche un signal d'alarme lorsque la différence, entre l'amplitude du signal et la valeur moyenne (0̸), excède positivement ou négativement une première valeur de seuil (Δ₁).
  2. Clôture selon la revendication 1, caractérisée par le fait que le circuit (14) formant la valeur moyenne présente une mémoire sommatrice qui accumule les amplitudes de signaux établies au moyen d'un cycle d'exploration du dispositif de commutation (4, 5), puis divise l'amplitude de signal accumulée (Σ), en vue de former la valeur moyenne (0̸), par le nombre (n) des interrupteurs (4) actionnés lors d'un cycle d'exploration.
  3. Clôture selon la revendication 2, caractérisée par le fait qu'un registre à décalage (12) est branché en amont de la mémoire sommatrice (14), registre dont le registre d'entrée raccordé au circuit mesureur (8, 10), et dont le registre de sortie (s₁, sn), sont raccordés à la mémoire sommatrice (14), et dont le nombre (n) de registres (s) correspond au nombre (n) des interrupteurs (4) actionnés lors d'un cycle d'exploration ; clôture dans laquelle, à chaque instant d'exploration (T), le signal émis par le registre de sortie (sn) diminue dans la mémoire sommatrice (14) l'amplitude de signal accumulée (Σ), et la valeur introduite dans le registre d'entrée (s₁) augmente l'amplitude de signal accumulée.
  4. Clôture selon la revendication 3, caractérisée par le fait qu'une mémoire intermédiaire (13), branchée entre le registre de sortie (sn) et la mémoire sommatrice (14), mémorise à court terme le signal émis par le registre de sortie (sn), puis l'applique à la mémoire sommatrice (14).
  5. Clôture selon la revendication 3, caractérisée par le fait qu'un inverseur est branché entre le registre de sortie (sn) et la mémoire sommatrice (14), inverseur dont la sortie est raccordée à la même entrée de la mémoire sommatrice (14) que le registre d'entrée (s₁), ledit inverseur provoquant une inversion de signe du signal émis par le registre de sortie (sn) et appliqué à la mémoire sommatrice (14).
  6. Clôture selon la revendication 5, caractérisée par le fait que l'inverseur fait partie de la mémoire intermédiaire (13).
  7. Clôture selon la revendication 3, caractérisée par le fait que la mémoire d'entrée (s₁) du registre à décalage (12) est raccordée au circuit comparateur (15), et le signal appliqué à ladite mémoire d'entrée (s₁) est simultanément appliqué audit circuit comparateur (15).
  8. Clôture selon la revendication 3, caractérisée par le fait que, à l'apparition du signal d'alarme, le signal introduit à cet instant dans le registre d'entrée (s₁) continue d'être comparé, dans le circuit comparateur (15), au signal qui est émis à cet instant à partir du registre de sortie (sn).
  9. Clôture selon la revendication 8, caractérisée par le fait que, lorsque la différence entre les signaux introduitset émis n'excède pas une troisième valeur de seuil (Δ₃) à l'instant de l'apparition du signal d'alarme, les signaux du détecteur ayant déclenché le signal d'alarme, qui sont introduits dans le registre d'entrée (S₁), sont comparés lors de chaque période d'exploration successive aux signaux émis à partir du registre de sortie (sn), et le circuit comparateur (15) transmet le signal d'alarme en vue du déclenchement de l'alarme lorsque, à un instant d'exploration (Tm),  la différence entre les signaux comparés (Am, Am-1) excède une deuxième valeur de seuil (Δ₂).
  10. Clôture selon la revendication 8, caractérisée par le fait que, lorsque la différence entre les signaux introduit et émis excède une troisième valeur de seuil (Δ₃) à l'instant de l'apparition du signal d'alarme, le signal (A₀) émis à partir du registre de sortie (sn) est comparé, durant un nombre restreint de périodes d'exploration, aux signaux du détecteur ayant déclenché le signal d'alarme, qui sont introduits dans le registre d'entrée (s₁), et le circuit comparateur (15) transmet le signal d'alarme en vue du déclenchement de l'alarme lorsque, durant ces périodes d'exploration, la différence entre les signaux comparés (A₀, A₁ à A₃) excède la troisième valeur de seuil (Δ₃).
  11. Clôture selon la revendication 1, caractérisée par le fait que les signaux d'alarme du circuit comparateur (15) sont appliqués à un circuit d' identification (16) qui est raccordé au générateur d' impulsions (5) commandant l'actionnement des interrupteurs, et identifie le détecteur déclenchant le signal d'alarme.
  12. Clôture selon la revendication 8, caractérisée par le fait que, entre le circuit comparateur (15) et un circuit d'identification (16) identifiant le détecteur qui déclenche le signal d'alarme, est branché un circuit de décision (17) qui évalue la comparaison entre les amplitudes de signaux durant les périodes d'exploration succédant à l'apparition du signal d'alarme, et qui commande la mémorisation et la transmission du signal d'alarme en vue du déclenchement de l'alarme.
  13. Clôture selon la revendication 1, caractérisée par le fait que la formation de la valeur moyenne a lieu dans des groupes de détecteurs de ladite clôture, les détecteurs d'un groupe étant affectés à des fils de sécurité respectivement soumis à des influences écologiques ou climatiques identiques.
EP86106644A 1985-07-04 1986-05-15 Clôture avec fils de sécurité fixés à des poteaux par l'intermédiaire de détecteurs Expired - Lifetime EP0208093B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86106644T ATE80747T1 (de) 1985-07-04 1986-05-15 Zaun mit ueber sensoren an pfosten befestigten sicherungsdraehten.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3523872A DE3523872C1 (de) 1985-07-04 1985-07-04 Zaun mit ueber Sensoren an Pfosten befestigten Sicherungsdraehten
DE3523872 1985-07-04

Publications (3)

Publication Number Publication Date
EP0208093A2 EP0208093A2 (fr) 1987-01-14
EP0208093A3 EP0208093A3 (en) 1988-05-04
EP0208093B1 true EP0208093B1 (fr) 1992-09-16

Family

ID=6274908

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86106644A Expired - Lifetime EP0208093B1 (fr) 1985-07-04 1986-05-15 Clôture avec fils de sécurité fixés à des poteaux par l'intermédiaire de détecteurs

Country Status (6)

Country Link
US (1) US4736194A (fr)
EP (1) EP0208093B1 (fr)
AT (1) ATE80747T1 (fr)
CA (1) CA1266711A (fr)
DE (2) DE3523872C1 (fr)
ES (1) ES8705664A1 (fr)

Families Citing this family (8)

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Publication number Priority date Publication date Assignee Title
DE4007298A1 (de) * 1990-03-08 1991-09-12 Rainer Grimm Ueberwachungseinrichtung fuer einen sicherheitszaun
US5392027A (en) * 1991-11-04 1995-02-21 Detek Security Systems, Inc. Full bridge strain gage deflection sensor
US5371488A (en) * 1993-05-27 1994-12-06 Waymax, Inc. Tension sensing security apparatus and method for fencing
US5402367A (en) * 1993-07-19 1995-03-28 Texas Instruments, Incorporated Apparatus and method for model based process control
US5982291A (en) * 1997-03-31 1999-11-09 Williams; Julie A. Electric fence security system
US6087934A (en) * 1997-12-26 2000-07-11 Golab; Thomas Velocity-discriminating cable motion transducer system
US10072997B2 (en) 2015-11-17 2018-09-11 Rockwell Automation Technologies, Inc. Safety switch with imbalance test
US9824841B2 (en) 2015-11-17 2017-11-21 Rockwell Automation Technologies, Inc. Safety switch and associated methods

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Publication number Priority date Publication date Assignee Title
DE2413650B2 (de) * 1974-03-21 1976-03-18 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Zaun mit alarmanlage
DE2542544A1 (de) * 1975-09-24 1977-03-31 Licentia Gmbh Mehrere sicherungsdraehte aufweisender zaun mit alarmanlage
US4155083A (en) * 1976-02-19 1979-05-15 N. V. Bekaert S. A. Composite wire and fence made therefrom useful for security purposes
US4124848A (en) * 1977-09-21 1978-11-07 Automation Industries, Inc. Range limited area protection system
CA1116286A (fr) * 1979-02-20 1982-01-12 Control Data Canada, Ltd. Systeme de surveillance anti-effraction en peripherie
US4297684A (en) * 1979-03-26 1981-10-27 Honeywell Inc. Fiber optic intruder alarm system
IL60240A (en) * 1980-06-05 1982-07-30 Beta Eng & Dev Ltd Intrusion detection system and detectors useful therein
US4591834A (en) * 1983-11-25 1986-05-27 Argus Systems, Inc. Intrusion detecting apparatus with zone identification and with noise interference discrimination

Also Published As

Publication number Publication date
US4736194A (en) 1988-04-05
ES8705664A1 (es) 1987-05-01
CA1266711A (fr) 1990-03-13
DE3686746D1 (de) 1992-10-22
EP0208093A2 (fr) 1987-01-14
DE3523872C1 (de) 1986-09-25
ES555962A0 (es) 1987-05-01
EP0208093A3 (en) 1988-05-04
ATE80747T1 (de) 1992-10-15

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