WO1990010280A1 - Agencement de controle electronique - Google Patents

Agencement de controle electronique Download PDF

Info

Publication number
WO1990010280A1
WO1990010280A1 PCT/GB1990/000321 GB9000321W WO9010280A1 WO 1990010280 A1 WO1990010280 A1 WO 1990010280A1 GB 9000321 W GB9000321 W GB 9000321W WO 9010280 A1 WO9010280 A1 WO 9010280A1
Authority
WO
WIPO (PCT)
Prior art keywords
unit
circuit
electronic monitoring
oscillator circuit
monitoring arrangement
Prior art date
Application number
PCT/GB1990/000321
Other languages
English (en)
Inventor
Paul Harden
Paul Michael Green
Original Assignee
Marconi Electronic Devices Limited
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 Marconi Electronic Devices Limited filed Critical Marconi Electronic Devices Limited
Publication of WO1990010280A1 publication Critical patent/WO1990010280A1/fr

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/02—Alarms for ensuring the safety of persons
    • G08B21/0202—Child monitoring systems using a transmitter-receiver system carried by the parent and the child
    • G08B21/028—Communication between parent and child units via remote transmission means, e.g. satellite network
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/02—Mechanical actuation
    • G08B13/14—Mechanical actuation by lifting or attempted removal of hand-portable articles
    • G08B13/149—Mechanical actuation by lifting or attempted removal of hand-portable articles with electric, magnetic, capacitive switch actuation
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/26—Electrical actuation by proximity of an intruder causing variation in capacitance or inductance of a circuit
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/02—Alarms for ensuring the safety of persons
    • G08B21/0202—Child monitoring systems using a transmitter-receiver system carried by the parent and the child
    • G08B21/0241—Data exchange details, e.g. data protocol
    • G08B21/0247—System arrangements wherein the alarm criteria uses signal strength
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/02—Alarms for ensuring the safety of persons
    • G08B21/0202—Child monitoring systems using a transmitter-receiver system carried by the parent and the child
    • G08B21/0286—Tampering or removal detection of the child unit from child or article
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/02—Alarms for ensuring the safety of persons
    • G08B21/0202—Child monitoring systems using a transmitter-receiver system carried by the parent and the child
    • G08B21/0288—Attachment of child unit to child/article
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/18—Status alarms
    • G08B21/24—Reminder alarms, e.g. anti-loss alarms

Definitions

  • the present invention relates to the electronic monitoring of the location of movable objects, and in particular although not exclusively to the monitoring of the location of tagging units which can be attached to persons.
  • Each tagging unit may be arranged to communicate with a nearby terminal, either at regular intervals or in response to request signals from that terminal, to confirm that it is still within a predetermined locality.
  • a tagging unit in use remains attached for a given period to the person to whom it is assigned, in which case it is desirable that an indication be given if the unit is detached from the person during that period.
  • a personal portable signalling unit for an electronic monitoring arrangement the unit being arranged to be secured closely adjacent a carrier's body, includes an electric oscillator circuit, coupling means capacitively to couple an output of said oscillator circuit to an oscillatory signal detector circuit, and means to give an indication if the level of said oscillatory signal reaching said detector circuit from said oscillator circuit by way of said coupling means changes from a predetermined level or range of levels.
  • Electronic monitoring arrangements in accordance with the present invention will now be described by way of example with reference to the accompanying drawings, of which:-
  • Figure 1 shows diagrammatically part of the electric circuit of a portable signalling unit of one embodiment
  • Figures 2 and 3 show diagrammatically two different dispositions of component parts of a portable signalling unit of the embodiment shown in Figure 1;
  • Figure 4 shows diagrammatically part of the electric circuit of a portable unit of a second embodiment
  • Figure 5 shows diagrammatically a wrist strap arrangement for this embodiment.
  • an electronic monitoring arrangement in accordance with the invention comprises one or more portable signalling units 1, shown diagrammatically in Figures 2 and 3, which take the form of packages or "tags" which may be strapped to the ankle of a person so as to enable the location of that person to be monitored.
  • a person may be required to remain within a designated locality during certain periods, and compliance- may be verified by arranging for the tag to transmit short-range radio signals or the like to a nearby terminal unit, (not shown) which in turn may forward the signals by way of a telephone line to a central monitoring unit (not shown).
  • the transmissions may either take place periodically, say every two minutes, or may be effectively continuously. If the person leaves the designated locality the strength of the signal received at the terminal unit falls below a threshold value and so effectively ceases. This triggers an alarm at the central monitoring unit so that appropriate action can be taken.
  • the circuit comprises an oscillator 2 which is arranged to generate an oscillatory signal of a frequency in the range, say, 50 to lOOKHz which is applied to one electrode of a capacitor 3, in the form of a pair of thin copper plates (not shown) formed on a flexible substrate 4, Figures 2 and 3.
  • Oscillatory signals passed by the capacitor 3 are applied by way of an amplifier 5 to a detector 6, and the output of this detector is arranged to trigger a latch circuit 7 to provide tamper signal and power latching signals by way of respective interface stages 8 and 9.
  • the plates or electrodes of the capacitor 3 are held close to the wearer's ankle, in which position the oscillatory signal generated by the oscillator 2 is largely diverted to earth through the wearer's body and very little is coupled to the amplifier 5.
  • a unidirectional voltage level is provided for the input to the amplifier 5 from a circuit 10.
  • the power latch When it is required the power latch is de-activated by means of a magnetic clip which is placed around the casing of the tag and which operates a reed switch to turn off the power supply. Correct orientation of this clip may be ensured by means of an indent in the casing which is arranged to match a protrusion on the clip.
  • the extra circuitry of Figure 1 may be placed either alongside the transmitter circuit 11 or between the transmitter circuit 11 and the battery unit 13 of the tag. Alternatively the extra circuitry may be made integral with the transmitter circuit 11.
  • an energising voltage signal is applied to a terminal 14 for, say, one sixth of a millisecond every forty milliseconds to energise an oscillator 15, operating at a frequency of, say, 30 KHz by way of buffers 16 from a positive supply line 17.
  • An output signal comprising each time some five cycles at 30KHz from the oscillator 15 is applied to a transmitter electrode 18 which is capacitvely coupled by way of an electrode 19, extending through the wrist strap to a receiver electrode 20.
  • the signal from the receiver electrode 20 is passed by way of an amplifier 21 to a threshold detector 22 where, in normal operation, the five cycles of 30KHz signal exceed the threshold set at a variable voltage tap 23 so that a series of five positive pulses are produced at the drain of a field effect transistor 24 effectively to hold a capacitor 25 discharged during each series of pulses.
  • the capacitor 25 charges to a positive voltage and a latch circuit 26 operates to supply a pulse to a counter 27.
  • the latch circuit 26 is reset each time the energising voltage is applied to the oscillator 15, by way of a transistor stage 28, so that each time the received burst of 30KHz signal fails to exceed the threshold value at the detector 22 the latch circuit 26 applies a pulse to the counter 27.
  • the counter 27 is arranged to be reset, say, every two and a half minutes, but within that period the counter 27 reaches a count of, say, 128 a further latch circuit 29 is set, to provide a tamper indication at an output terminal 30 and a signal at a terminal 31 to cause the monitor transmit (not shown) to operate repeatedly for a predetermined period.
  • the latch circuit 29 prevents the tamper indication from being removed for example by replacing the wrist strap with some other conductor, and the circuit 29 can only be reset by a signal applied to a transistor 32.
  • a guard plate 33 is positioned between the receiver electrode 20 and the battery unit 13 of the portable unit, and is fed with 30kHz signal from a point in the amplifier 21, such as to prevent required signals at the receiver electrode 20 from being shunted to the battery unit 13.
  • the transmitter and receiver electrodes 18 and 20 extend up the sides of the body of the portable unit, and the ends of the electrode 19 of the wrist strap are held closely adjacent these electrodes.
  • the guard plate 33 lies between the receiver electrode 20 and the battery unit 13.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Child & Adolescent Psychology (AREA)
  • General Health & Medical Sciences (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Near-Field Transmission Systems (AREA)
  • Burglar Alarm Systems (AREA)
  • Dicing (AREA)
  • Emergency Alarm Devices (AREA)

Abstract

Dans un agencement de contrôle électronique par exemple pour un système de couvre-feu domestique, le retrait non autorisé d'une unité émettrice à bracelet d'un sujet est agencé pour donner une indication à une unité de commande centrale, en réponse à un changement de couplage capacitif entre des électrodes normalement positionnées à proximité immédiate de la cheville du sujet.
PCT/GB1990/000321 1989-03-01 1990-03-01 Agencement de controle electronique WO1990010280A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB898904690A GB8904690D0 (en) 1989-03-01 1989-03-01 Electronic monitoring arrangement
GB8904690.8 1989-03-01

Publications (1)

Publication Number Publication Date
WO1990010280A1 true WO1990010280A1 (fr) 1990-09-07

Family

ID=10652547

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1990/000321 WO1990010280A1 (fr) 1989-03-01 1990-03-01 Agencement de controle electronique

Country Status (5)

Country Link
EP (1) EP0413803A1 (fr)
AU (1) AU5184790A (fr)
GB (2) GB8904690D0 (fr)
IL (1) IL93616A0 (fr)
WO (1) WO1990010280A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0520222A2 (fr) * 1991-06-26 1992-12-30 Siemens Aktiengesellschaft Détecteur capacitif de changement de champ
US6693543B1 (en) 1999-05-05 2004-02-17 Guidance Control Systems Limited Tagging device

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5237307A (en) * 1991-11-27 1993-08-17 The United States Of America As Represented By The United States Department Of Energy Non-contact tamper sensing by electronic means
JP3266089B2 (ja) 1997-12-25 2002-03-18 三菱マテリアル株式会社 電波式盗難検出装置
DE69927726T2 (de) * 1998-01-30 2006-07-06 Mitsubishi Materials Corp. HF-Antidiebstahlvorrichtung
GB2372363A (en) * 2000-12-01 2002-08-21 Peter Gwynne Security device having a capacitive sensor

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4598275A (en) * 1983-05-09 1986-07-01 Marc Industries Incorporated Movement monitor
US4736196A (en) * 1986-11-18 1988-04-05 Cost-Effective Monitoring Systems, Co. Electronic monitoring system
US4777477A (en) * 1987-04-27 1988-10-11 Watson Ronald R Surveillance alarm-security system
US4785291A (en) * 1987-03-06 1988-11-15 Hawthorne Candy C Distance monitor especially for child surveillance

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2040524A (en) * 1979-12-04 1980-08-28 Lawrence Security Services Ltd Alarm System
US4658818A (en) * 1985-04-12 1987-04-21 Miller Jr George E Apparatus for tagging and detecting surgical implements
US4885571A (en) * 1986-04-15 1989-12-05 B. I. Incorperated Tag for use with personnel monitoring system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4598275A (en) * 1983-05-09 1986-07-01 Marc Industries Incorporated Movement monitor
US4736196A (en) * 1986-11-18 1988-04-05 Cost-Effective Monitoring Systems, Co. Electronic monitoring system
US4785291A (en) * 1987-03-06 1988-11-15 Hawthorne Candy C Distance monitor especially for child surveillance
US4777477A (en) * 1987-04-27 1988-10-11 Watson Ronald R Surveillance alarm-security system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0520222A2 (fr) * 1991-06-26 1992-12-30 Siemens Aktiengesellschaft Détecteur capacitif de changement de champ
EP0520222A3 (en) * 1991-06-26 1993-02-03 Siemens Aktiengesellschaft Capacitive field changing sensor
US6693543B1 (en) 1999-05-05 2004-02-17 Guidance Control Systems Limited Tagging device

Also Published As

Publication number Publication date
GB8904690D0 (en) 1989-04-12
GB9004599D0 (en) 1990-04-25
AU5184790A (en) 1990-09-26
IL93616A0 (en) 1990-12-23
EP0413803A1 (fr) 1991-02-27
GB2230164A (en) 1990-10-10

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