EP0476397A1 - Détecteur d'intrusion - Google Patents

Détecteur d'intrusion Download PDF

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Publication number
EP0476397A1
EP0476397A1 EP91114646A EP91114646A EP0476397A1 EP 0476397 A1 EP0476397 A1 EP 0476397A1 EP 91114646 A EP91114646 A EP 91114646A EP 91114646 A EP91114646 A EP 91114646A EP 0476397 A1 EP0476397 A1 EP 0476397A1
Authority
EP
European Patent Office
Prior art keywords
ultrasound
window
ultrasonic
receiver
emitter
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
Application number
EP91114646A
Other languages
German (de)
English (en)
Other versions
EP0476397B2 (fr
EP0476397B1 (fr
Inventor
Peter Steiner
David Siegwart
Markus Rechsteiner
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.)
Siemens Building Technologies AG
Original Assignee
Cerberus AG
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=4243258&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0476397(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Cerberus AG filed Critical Cerberus AG
Priority to AT91114646T priority Critical patent/ATE98390T1/de
Publication of EP0476397A1 publication Critical patent/EP0476397A1/fr
Application granted granted Critical
Publication of EP0476397B1 publication Critical patent/EP0476397B1/fr
Publication of EP0476397B2 publication Critical patent/EP0476397B2/fr
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
    • G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
    • G08B29/02—Monitoring continuously signalling or alarm systems
    • G08B29/04—Monitoring of the detection circuits
    • G08B29/046—Monitoring of the detection circuits prevention of tampering with detection circuits

Definitions

  • the invention relates to an intrusion detector according to the preamble of patent claim 1.
  • intrusion detectors are known for example from DE-A-22'16'236. They consist of a combination of a passive infrared detector and an ultrasonic detector, which are connected to one another in an AND circuit. The infrared part reacts to the body radiation of a person in the infrared spectral range and the ultrasound part to the frequency shift of the ultrasound reflected by a moving intruder caused by the Doppler effect.
  • an unwanted intrusion of a person into a protected area can be detected with greater security and selectivity than by using only a single detection method. In this way, faulty alarm signaling can be avoided with greater certainty.
  • Passive infrared intrusion detectors are known for example from EP-A1-0'189'536. They are used to detect an object that has entered a monitored area, e.g. to detect an intruder by means of the infrared radiation emitted by the intruder and to trigger an alarm signal via an evaluation circuit.
  • a corresponding number of spatially distributed sensitivity areas is formed by a number of reflector or mirror segments, via which the incoming radiation is directed to the sensor, and when penetrated by an intruder, a radiation change of the sensor and thus an alarm signal is generated.
  • the sensor can have a single sensor element, or it can be designed as a multiple or dual sensor with two or more separate sensor elements or flakes, whereby the number of sensitivity ranges is at least doubled.
  • the housing of the detector is closed in the direction of radiation by a window which is open to the infrared radiation to be detected, e.g. is transparent to the body radiation of a person in the range from about 5 to 15 ⁇ m, preferably between 7 to 12 ⁇ m, but is largely impermeable to shorter-wave radiation.
  • This window can in turn be optically bundled, e.g. as a Fresnel lens, which generates the desired sensitivity ranges, so that mirror segments can be omitted if necessary.
  • ultrasonic intrusion detectors e.g. known from CH-A-556'070 or EP-A1-0'158'022. These have an ultrasound emitter, which emits ultrasound with a frequency of over 20 kHz in the monitored area in front of the detector, and an ultrasound receiver, which records the ultrasound reflected from the room and feeds it to an evaluation circuit. While stationary objects only reflect ultrasound at the transmission frequency, a moving intruder causes a frequency shift according to the Doppler effect. The evaluation circuit triggers an alarm signal if this frequency shift corresponds to values which are typical for a moving person and if at the same time an infrared radiation is received which is characteristic of human intruders.
  • infrared intrusion detector known from EP-A2-0'274'889 is an infrared sensor combined with a microwave system in a logic circuit which only triggers an alarm signal if both systems simultaneously emit a signal.
  • the infrared sensor is arranged between the microwave transmitter and receiver directly adjacent to it behind the entrance window. An attempt to cover the window or to apply a spray layer or to put a shield in front of the window can be detected by the microwave part.
  • this can only be used to detect objects that reflect or absorb microwaves, i.e. preferably metallic conductive materials, but just not many foils or lacquers that are opaque to infrared radiation and often used for sabotage attempts.
  • the invention sets itself the task of eliminating the above-mentioned disadvantages of the prior art and, in particular, to provide a combined intrusion detector of the type specified at the outset which attempts to sabotage or reduce the functionality by means of shielding with greater security and with less effort and can signal.
  • Such a temporal change in the ultrasound field exists e.g. in a change in the sound pressure or the transit time of the ultrasound reflected by objects in the monitored room. As soon as such a measured variable has changed compared to an earlier point in time or to an average from previous measurements, this is an indication that a change has been made in the room, e.g. a shield has been placed in the room.
  • a temporal parameter change of the sound field can easily be processed separately from the Doppler frequency evaluation.
  • ultrasound can also be used to detect shields which absorb radiation in the far infrared, but which are transparent to microwaves or light and to radiation in the neighboring infrared.
  • Ultrasound emitters and receivers are preferably arranged on different sides of the entrance window, so that the ultrasound field covers the window area. Instead, however, it can be advantageous to arrange the ultrasound emitter and receiver adjacent to the same window side and to guide the ultrasound over the window by means of reflectors which are arranged on one or different sides of the window.
  • the exit surface of the ultrasound emitter and the entrance surface of the ultrasound receiver are particularly advantageously arranged on both sides of a plane formed by the front wall of the housing at the location of the window, so that at least one acoustically effective area of the ultrasound components, e.g. Emitter, receiver or a reflector lies within the recess.
  • a cover provided with fine openings, which is at least largely transparent to infrared radiation and ultrasound, e.g.
  • a fine-mesh grid or a perforated film to be provided and arranged in such a way that the front surfaces of the ultrasound emitter and receiver lie on different sides of the cover and the cover is thus irradiated by the generated ultrasound. This will result in an attempt at impermeability, e.g. by spraying, monitored.
  • the intrusion detector according to the invention has both an infrared part and an ultrasound part anyway, it can advantageously be supplemented by a temporal ultrasound field evaluation and an infrared window monitoring device which is known in principle, without significantly increased outlay, which optimizes tamper protection and reduces the susceptibility to false alarms.
  • the infrared intrusion detector shown in Figure 1 has a housing 1, preferably made of plastic. Arranged in the interior of the housing 1 is an infrared radiation in the evaluated spectral range from 5 to 15 ⁇ m, in particular from 7 to 12 ⁇ m, a highly reflective, preferably metal, mirror or reflector 2, which, for example, as in EP-A1-0'189 '536 or may be configured in a suitable manner as a segment mirror to form a number of spatial sensitivity areas.
  • the part 3 adjoining the mirror segments at the top serves to shield electromagnetic fields from the circuit board 4 arranged in front of it with the components of the evaluation circuit mounted thereon.
  • the infrared sensor 5 is attached to the lower part of the circuit board 4 and is designed, for example, as a pyroelectric sensor and is sensitive to human body radiation at least in the spectral range.
  • This sensor 5 can have a single radiation-sensitive element or can be designed as a multiple or dual sensor with at least two adjacent sensor elements.
  • an entry window 9 is provided in a recess 8, through which infrared radiation incident on the detector can pass and can reach the sensor 5 via the reflector 2.
  • the window 9 is made of a material which is preferably for human body radiation, i.e. is transparent in the wavelength range from 5 to 15 ⁇ m, in particular 7 to 12 ⁇ m, e.g. made of a suitable plastic such as polyethylene, special glass or silicon.
  • the window protects the inside of the detector, in particular the optical reflectors 2 and the sensor 5, from damage and dust.
  • the window can also be designed as an optically active element, e.g. as a Fresnel lens, to participate in the beam bundling and the creation of separate sensitivity areas.
  • the detector In order to prevent the detector from becoming ineffective by attaching a radiation-absorbing shield in front of the detector housing, which shields incoming infrared radiation from the entrance window 9, the detector is equipped with a device for detecting and signaling such a function-reducing shield.
  • this consists of an ultrasound emitter 10 provided on one side of the radiation entry window 9 and an ultrasound receiver 11 located on the opposite side of the window 9.
  • the emitter 10 emits ultrasound in the frequency range somewhat above the hearing range, for example in the frequency range around 25 kHz.
  • an ultrasound field US1 is formed, which changes when a sound-shielding wall is installed in front of the detector.
  • the receiver 11 is connected to a suitable evaluation circuit which triggers a fault signal when the ultrasound registered by the receiver 11 changes in a predetermined manner, as is characteristic for the application of a shield in front of the detector.
  • the intensity of the ultrasound received and its time course are compared with the measurement results obtained at an earlier point in time or mean values formed from earlier measurements, and deviations are determined which are typical for changes in the monitored space in front of the detector.
  • ultrasound is also used to detect and report shielding materials that absorb radiation in the far infrared, but for light and microwaves are practically permeable, which was previously not possible with infrared intrusion detectors with tamper protection devices working on infrared or microwave basis.
  • the intrusion detector contains an ultrasound device anyway, this can be used with surprising advantages and without any special additional effort for function monitoring of the infrared part of the intrusion detector. All that is required is to arrange the ultrasound emitters 10, 12 on the front side 7 of the housing, as shown in FIGS. 2 and 3a, so that the ultrasound emitted into the space in front of the detector forms an ultrasound field in front of the infrared window 9.
  • the evaluation circuit is to be designed in such a way that it triggers an alarm signal when the ultrasound reflected from a moving object shows a predetermined frequency shift in accordance with the speed of movement of the object and at the same time the infrared part emits an output signal and a fault signal when the received ultrasound detects a certain change compared to earlier times. The circuit required for this can be effortlessly and without great effort integrate into the existing evaluation circuit.
  • the device described is capable of determining an infrared shielding in front of the detector over a large distance range with great certainty, a shielding applied directly to the window 9 cannot be detected easily.
  • the entrance window 9 is installed in a recess 8 in the front wall 7 of the housing, which hinders the application of a suitable shielding film.
  • the window could still be reached with a spray.
  • the openings should have a size at most in the range of tenths of a millimeter, so that they are closed by spraying and the cover thereby becomes impermeable. If, as shown in FIG. 3b, the sound exit surface of the ultrasound emitter 10 is located inside the recess 8 behind the cover 14, but the surface of the receiver 11 on the front side 7 outside the cover 14, the ultrasound normally penetrates the cover 14 through the openings. However, it is blocked by sprayed paint when the openings are closed, so that an attempt at sabotage is recognized and reported here too.
  • an infrared radiation source 15 can be provided in the shoulder of the depression 8, said infrared radiation illuminating the sensor 5 through the window 9 via an optical reflector 16. If this radiation is absent or reduced, an interference signal is generated in a manner known per se.
  • ultrasound emitters and receivers can each be provided, however, as shown in FIG. 4, only a single ultrasound emitter 17 and a receiver 18 can be attached to the same side of the window 9.
  • the ultrasound is here from the emitter 17 via one or more acoustic reflectors 19, e.g. Sheet metal strips, fed through the window 9 to the receiver 9.
  • the ultrasound receiver 11, 18 it is advantageous to switch the ultrasound receiver 11, 18 in such a way that it detects the occurrence of frequencies shifted according to the Doppler effect alternately in normal operation during certain room monitoring phases, for example of several seconds, in between during the periodic control phases of some
  • the test is carried out by means of short ultrasound pulses or modulations of the ultrasound transmitters 10, 12, 17 for a tenth of a second, with striking changes in the sound field compared to previous control phases being regarded as signs of an attempted sabotage.
  • the element periodically alternately emits short control pulses and is immediately switched to normal reception mode.
  • acoustic reflectors ensure that, in the undisturbed case, a well-known echo pulse returns to the receiver, but changes in amplitude and in time with every change due to changed reflections in the space in front of the detector.

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  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)
EP91114646A 1990-09-05 1991-08-30 Détecteur d'intrusion Expired - Lifetime EP0476397B2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT91114646T ATE98390T1 (de) 1990-09-05 1991-08-30 Intrusionsdetektor.

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH2862/90 1990-09-05
CH286290 1990-09-05
CH2862/90A CH680881A5 (fr) 1990-09-05 1990-09-05

Publications (3)

Publication Number Publication Date
EP0476397A1 true EP0476397A1 (fr) 1992-03-25
EP0476397B1 EP0476397B1 (fr) 1993-12-08
EP0476397B2 EP0476397B2 (fr) 2001-10-17

Family

ID=4243258

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91114646A Expired - Lifetime EP0476397B2 (fr) 1990-09-05 1991-08-30 Détecteur d'intrusion

Country Status (4)

Country Link
EP (1) EP0476397B2 (fr)
AT (1) ATE98390T1 (fr)
CH (1) CH680881A5 (fr)
DE (1) DE59100692D1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2257822A (en) * 1991-06-27 1993-01-20 Prestige Aire 2000 Security system for test or monitoring equipment
EP1061489A1 (fr) * 1999-06-07 2000-12-20 Siemens Building Technologies AG Détecteur d'intrusion avec dispositif de surveillance contre un sabotage
US6297745B1 (en) 1999-03-08 2001-10-02 Siemens Buildings Technologies Ag Housing for an alarm
EP2136342A1 (fr) * 2008-06-17 2009-12-23 Honeywell International Inc. Détecteur de mouvement pour détecter le sabotage et procédé pour détecter le sabotage
DE102009047531A1 (de) * 2009-12-04 2011-06-09 Atral- Secal Gmbh Rauchmelder mit Ultraschall-Abdecküberwachung
US8150202B2 (en) 2008-06-30 2012-04-03 Honeywell International Inc. Gaussian mixture model based illumination normalization for global enhancement
EP4174814A1 (fr) * 2021-10-26 2023-05-03 Carrier Fire & Security EMEA BV Détecteur de mouvement avec détection de masquage

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2216236A1 (de) * 1971-04-05 1972-10-12 Pyrotector Inc., Hingham, Mass. (V.StA.) Einbruch-Detektorsystem
EP0289621A1 (fr) * 1986-10-31 1988-11-09 Takenaka Engineering Co. Ltd. Detecteur infrarouge passif de cambriolage pourvu d'un mecanisme de surveillance d'interruptions du champ visuel
EP0337964A1 (fr) * 1988-04-13 1989-10-18 ELKRON S.p.A. Dispositif de détection combinée à infrarouge et micro-ondes, en particulier pour systèmes contre l'intrusion

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2216236A1 (de) * 1971-04-05 1972-10-12 Pyrotector Inc., Hingham, Mass. (V.StA.) Einbruch-Detektorsystem
EP0289621A1 (fr) * 1986-10-31 1988-11-09 Takenaka Engineering Co. Ltd. Detecteur infrarouge passif de cambriolage pourvu d'un mecanisme de surveillance d'interruptions du champ visuel
EP0337964A1 (fr) * 1988-04-13 1989-10-18 ELKRON S.p.A. Dispositif de détection combinée à infrarouge et micro-ondes, en particulier pour systèmes contre l'intrusion

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2257822A (en) * 1991-06-27 1993-01-20 Prestige Aire 2000 Security system for test or monitoring equipment
US6297745B1 (en) 1999-03-08 2001-10-02 Siemens Buildings Technologies Ag Housing for an alarm
EP1061489A1 (fr) * 1999-06-07 2000-12-20 Siemens Building Technologies AG Détecteur d'intrusion avec dispositif de surveillance contre un sabotage
US7852210B2 (en) 2007-12-31 2010-12-14 Honeywell International Inc. Motion detector for detecting tampering and method for detecting tampering
EP2136342A1 (fr) * 2008-06-17 2009-12-23 Honeywell International Inc. Détecteur de mouvement pour détecter le sabotage et procédé pour détecter le sabotage
CN101608951B (zh) * 2008-06-17 2014-07-16 霍尼韦尔国际公司 用于探测破坏的运动探测器和用于探测破坏的方法
US8150202B2 (en) 2008-06-30 2012-04-03 Honeywell International Inc. Gaussian mixture model based illumination normalization for global enhancement
DE102009047531A1 (de) * 2009-12-04 2011-06-09 Atral- Secal Gmbh Rauchmelder mit Ultraschall-Abdecküberwachung
EP4174814A1 (fr) * 2021-10-26 2023-05-03 Carrier Fire & Security EMEA BV Détecteur de mouvement avec détection de masquage

Also Published As

Publication number Publication date
CH680881A5 (fr) 1992-11-30
DE59100692D1 (de) 1994-01-20
EP0476397B2 (fr) 2001-10-17
EP0476397B1 (fr) 1993-12-08
ATE98390T1 (de) 1993-12-15

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PLAB Opposition data, opponent's data or that of the opponent's representative modified

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