EP0408595A1 - Detecteur d'intrus a ondes hertziennes. - Google Patents
Detecteur d'intrus a ondes hertziennes.Info
- Publication number
- EP0408595A1 EP0408595A1 EP89903178A EP89903178A EP0408595A1 EP 0408595 A1 EP0408595 A1 EP 0408595A1 EP 89903178 A EP89903178 A EP 89903178A EP 89903178 A EP89903178 A EP 89903178A EP 0408595 A1 EP0408595 A1 EP 0408595A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- antenna
- signal
- conductive
- receiving member
- distance
- 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.)
- Granted
Links
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 or a movement in a volume are only active if the event does not freeze.
- 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 towards 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 transmitter is constituted by a pulse generator working in a frequency range oscillating 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.
- a modulation (7) is preferred in the transmission signal and in the case of very noisy places or requiring special security an encoding signal (5) is desirable.
- the transmission signal from the pulse generator (6) and the modulator (7) is amplified (9) to be directed to 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 the coding signal (5) exists.
- the signal (3) transmitted by the antenna (2) is received via the airspace on the 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. In addition, 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).
- the transmitting antenna (2) will evolve: having only a small area of radiation to monitor a specific location it can 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)
Abstract
Description
Claims
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 true EP0408595A1 (fr) | 1991-01-23 |
EP0408595B1 EP0408595B1 (fr) | 1995-01-18 |
Family
ID=9364194
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP89903178A Expired - Lifetime EP0408595B1 (fr) | 1988-03-11 | 1989-03-08 | Detecteur d'intrus a ondes hertziennes |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0408595B1 (fr) |
AT (1) | ATE117448T1 (fr) |
DE (1) | DE68920736D1 (fr) |
FR (1) | FR2628556A1 (fr) |
WO (1) | WO1989008903A1 (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1995008126A1 (fr) * | 1993-09-14 | 1995-03-23 | Yoco Pty. Ltd. | Detection de mouvement |
Family Cites Families (6)
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 |
-
1988
- 1988-03-11 FR FR8803201A patent/FR2628556A1/fr not_active Withdrawn
-
1989
- 1989-03-08 WO PCT/FR1989/000093 patent/WO1989008903A1/fr active IP Right Grant
- 1989-03-08 DE DE68920736T patent/DE68920736D1/de not_active Expired - Lifetime
- 1989-03-08 AT AT89903178T patent/ATE117448T1/de not_active IP Right Cessation
- 1989-03-08 EP EP89903178A patent/EP0408595B1/fr not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO8908903A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO1989008903A1 (fr) | 1989-09-21 |
DE68920736D1 (de) | 1995-03-02 |
ATE117448T1 (de) | 1995-02-15 |
FR2628556A1 (fr) | 1989-09-15 |
EP0408595B1 (fr) | 1995-01-18 |
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Legal Events
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