EP0408595B1 - Eindringdetektor, der elektromagnetische wellen verwendet - Google Patents

Eindringdetektor, der elektromagnetische wellen verwendet Download PDF

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Publication number
EP0408595B1
EP0408595B1 EP89903178A EP89903178A EP0408595B1 EP 0408595 B1 EP0408595 B1 EP 0408595B1 EP 89903178 A EP89903178 A EP 89903178A EP 89903178 A EP89903178 A EP 89903178A EP 0408595 B1 EP0408595 B1 EP 0408595B1
Authority
EP
European Patent Office
Prior art keywords
signal
antenna
transmitter
conducting body
reception
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
EP89903178A
Other languages
English (en)
French (fr)
Other versions
EP0408595A1 (de
Inventor
Marcel Milin
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.)
MILIN, MARCEL
Original Assignee
MILIN Marcel
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 MILIN Marcel filed Critical MILIN Marcel
Publication of EP0408595A1 publication Critical patent/EP0408595A1/de
Application granted granted Critical
Publication of EP0408595B1 publication Critical patent/EP0408595B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/24—Electrical actuation by interference with electromagnetic field distribution

Definitions

  • the existing devices currently for detecting a presence, a movement in a volume are only active if the event does not freeze.
  • a system is already known for detecting moving objects in a monitored area, by microwave diffraction (French patent application 2,290,714 ), however, with this system, it is only possible to detect moving objects. It uses a 10 GHZ microwave oscillator and not a pulse generator; the signal is modulated in microwaves and is transmitted by an antenna of the horn type which allows a directional emission with a minimum of loss; consequently, the protected volume is a function of the opening angle of the antenna. If the object to be detected is located outside the antenna scanning lobe, or behind it, it is not detected. In addition, the alarm is triggered when the object enters the detection field and, if it stops in it, the alarm stops and does not resume until the object moves again; if it moves very slowly, it is not detected.
  • the object of the present invention is to remedy these drawbacks.
  • This invention as characterized in the claims, solves the problem of creating a detection device with which it is possible to detect a mobile or stationary element in a predetermined volume.
  • the present invention has the advantage of being able to act in a predetermined volume and the fact that the target is stationary or mobile does not intervene in the detection mode.
  • the detection distance can be adjusted as required from a few millimeters to several meters.
  • the element to be detected may be near the transmitting antenna or between the antennas.
  • the radiation caused by the body sufficiently conductive of Hertzian energy 28 plays a very important role depending on its position between the antennas; in fact, the closer the conducting body is to the transmitting antenna 2, the greater the energy radiated to the receiving antenna 11.
  • This effect will be cleverly used to determine the approximate distance from the conductive body 28 of the reception antenna 11; moreover, the immobility of the conductive body 28 is of no importance in the detection mode.
  • the absence of the same conductive body can also be reported.
  • the device cited as an example is in no way limiting, but on the contrary encompasses all variants.
  • the transmitter consists of a pulse generator working in a frequency range ranging from a few tenths of Hertz to several Megahertz.
  • a signal 4 from the transmitter 1 synchronizes the receiver so that during the idle time of no emission from the antenna 2 the receiver 13 is blocked.
  • modulation 7 in the transmission signal and in the case of very noisy places or requiring special security a coding signal 5 is desirable.
  • the transmission signal 10 from the pulse generator 6 and from the modulator 7 is amplified 9 so as to be directed towards the transmission antenna 2.
  • the receiver 13 is quite simply an amplifier 14 which directly receives the synchronization signal 4 coming from the transmitter 1 and if there is the coding signal 5.
  • the signal 3 emitted by the antenna 2 is received via airspace on antenna 11.
  • Two cases can arise: First case: In the absence of the conductive body 28, the signal collected on the receiver 13 is intended to be insufficient so as not to exceed the predetermined signaling threshold. Introducing a sufficiently conductive body 28 between the antennas 2 and 11 is sufficient to cause the receiver to react, which then activates the means 12 and 15 of command and signaling actions. Furthermore, the detection distance can be adjusted at will by acting on the transmission power 9 or more simply on the sensitivity 18 of the receiver 13.
  • Second case It should be noted that when the sensitivity of the receiver is judiciously adjusted to its triggering threshold without conductive presence between the antennas 2 and 11 the fact of placing between these two antennas a sufficiently conductive body 28 has the effect of creating a certain attenuation of the signal received on the antenna 11 therefore reacting the action means 12 and signaling 15 chosen.
  • the combination of the two cases described allows a multitude of applications, a transmitter being able to serve one or more receivers regulated differently to follow for example the evolution of an intruder in a room until the moment when he will try to take, or be very close to an object to protect. It is also possible with the aid of a single receiver to follow the path of the conductive body when the latter approaches or moves away from the receiving antenna 11.
  • the transmitting antenna 2 will evolve: having only a small area of radiation to monitor a specific location, it may go as far as covering the area of the volume to be monitored. to follow for example the evolution of the conductive object 28 in the space to be checked.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Geophysics And Detection Of Objects (AREA)

Claims (4)

  1. Elektronische Überwachungsvorrichtung, die es gestattet, in einem vorbestimmten Raum die Anwesenheit oder Abwesenheit eines Körpers zu detektieren und anzuzeigen, der in ausreichendem Maße Hertzsche Wellen leitet, mit der Möglichkeit, dessen Bewegung in dem zu kontrollierenden Raum zu verfolgen, bestehend aus einem Sender für modulierte und gegebenenfalls kodierte Hertzsche Wellen und aus einem Empfänger und zur Auswertung der verschiedenen Signale, die über oder nicht über den leitenden Körper ausgesendet werden, dadurch gekennzeichnet, daß der Sender für Hertzsche Wellen (1) einen Impulsgenerator (6) aufweist, wobei die Impulse zu einem Verstärker (9) gerichtet werden, der das Modulationssignal (7) und, wenn es vorhanden ist, das Kodierungssignal (5) empfängt, daß das modulierte und gegebenenfalls kodierte, verstärkte Signal (10) zur Sendeantenne (2) gerichtet wird, daß das Signal (3), das von der Antenne (2) ausgestrahlt wird, den Luftraum über den leitenden Körper (28) durchquert, der sich dann wie eine Zwischenantenne verhält, um die Antenne (11) des Empfängers (13) zu erreichen, daß der Empfänger (13) direkt durch ein Steuersignal (4) synchronisiert wird, das von dem Sender (1) ausgegeben wurde, wobei ermöglicht wird, am Empfänger (13) die Funktionseinrichtungen (12, 15) nach Verstärkung (14) des an der Antenne (11) empfangenen Signals (3) zu betreiben, daß der detektierungsabstand des leitenden Körpers (28) zur Antenne (11) durch Einstellen des Empfindlichkeits-Schwellenwerts des Verstärkers (14) erzielt wird, und daß die Anzeige der Bewegung des leitenden Körpers (28) in dem zu kontrollierenden Raum über einen Pegeldetektor (19) erzielt wird, der sich in dem Empfänger (13) befindet und es ermöglicht, durch Messen des an der Antenne (11) empfangenen Signals eine Angabe betreffend das Annähern oder das Wegbewegen des leitenden Körpers (28) in Bezug auf die Empfangsantenne (11) zu erhalten.
  2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Arbeitsfrequenz des Senders (1) in einem Bereich von einigen Zehntel Hertz bis zu mehreren Mega-Hertz eingestellt werden kann.
  3. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Strahlungsleistung der Antenne (2) durch den Verstärker (9) für die Leistung beliebig regelbar ist.
  4. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß, wenn die Sendung kodiert werden muß, diese Kodierung in dem Steuersignal (4) und dem Sendesignal (3) enthalten ist.
EP89903178A 1988-03-11 1989-03-08 Eindringdetektor, der elektromagnetische wellen verwendet Expired - Lifetime EP0408595B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR8803201 1988-03-11
FR8803201A FR2628556A1 (fr) 1988-03-11 1988-03-11 Detection de modification d'un volume par un corps conducteur
PCT/FR1989/000093 WO1989008903A1 (fr) 1988-03-11 1989-03-08 Detecteur d'intrus a ondes hertziennes

Publications (2)

Publication Number Publication Date
EP0408595A1 EP0408595A1 (de) 1991-01-23
EP0408595B1 true EP0408595B1 (de) 1995-01-18

Family

ID=9364194

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89903178A Expired - Lifetime EP0408595B1 (de) 1988-03-11 1989-03-08 Eindringdetektor, der elektromagnetische wellen verwendet

Country Status (5)

Country Link
EP (1) EP0408595B1 (de)
AT (1) ATE117448T1 (de)
DE (1) DE68920736D1 (de)
FR (1) FR2628556A1 (de)
WO (1) WO1989008903A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NZ273549A (en) * 1993-09-14 1996-12-20 John Ferdinand Muehlebach Movement detection; method and apparatus for detecting flying animals using microwave transmitted signal

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3863240A (en) * 1972-12-08 1975-01-28 Aerospace Res Electromagnetic intrusion detection system
DK135353B (da) * 1974-11-07 1977-04-12 Schloeer Boerge Anlæg til detektering af bevægelige objekter inden for et overvåget område ved mikrobølgediffraktion.
DE2806448C2 (de) * 1978-02-15 1985-01-10 Brown, Boveri & Cie Ag, 6800 Mannheim System zur Objektsicherung und zum Personenschutz mittels einer Mikrowellenschranke
US4334214A (en) * 1979-06-29 1982-06-08 Yagi Antenna Co., Ltd. Warning apparatus using microwaves
FR2578077A1 (fr) * 1985-02-27 1986-08-29 Alsthom Cgee Procede et dispositif de detection d'intrusion a barriere hyperfrequence
DE3525976A1 (de) * 1985-07-20 1987-01-29 Bbc Brown Boveri & Cie Verfahren zur objektsicherung

Also Published As

Publication number Publication date
ATE117448T1 (de) 1995-02-15
EP0408595A1 (de) 1991-01-23
WO1989008903A1 (fr) 1989-09-21
FR2628556A1 (fr) 1989-09-15
DE68920736D1 (de) 1995-03-02

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