EP0186226A1 - Intrusionsdetektoranlage mit Antimaskierungsvorrichtung - Google Patents

Intrusionsdetektoranlage mit Antimaskierungsvorrichtung Download PDF

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Publication number
EP0186226A1
EP0186226A1 EP85201873A EP85201873A EP0186226A1 EP 0186226 A1 EP0186226 A1 EP 0186226A1 EP 85201873 A EP85201873 A EP 85201873A EP 85201873 A EP85201873 A EP 85201873A EP 0186226 A1 EP0186226 A1 EP 0186226A1
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EP
European Patent Office
Prior art keywords
detector
detection device
masking
intruder detection
intruder
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
EP85201873A
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English (en)
French (fr)
Other versions
EP0186226B1 (de
Inventor
Michel Steers
Jean-Pierre Hazan
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.)
Laboratoires dElectronique Philips SAS
Koninklijke Philips NV
Original Assignee
Electronique & Physique
Laboratoires dElectronique Philips SAS
Laboratoires dElectronique et de Physique Appliquee
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
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 Electronique & Physique, Laboratoires dElectronique Philips SAS, Laboratoires dElectronique et de Physique Appliquee, Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Electronique & Physique
Publication of EP0186226A1 publication Critical patent/EP0186226A1/de
Application granted granted Critical
Publication of EP0186226B1 publication Critical patent/EP0186226B1/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
    • 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
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/18—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
    • G08B13/189—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems
    • G08B13/19—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using infrared-radiation detection systems
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S250/00—Radiant energy
    • Y10S250/01—Passive intrusion detectors

Definitions

  • the invention relates to an intruder detection device comprising, in a case provided with at least one window, a passive infrared detector Dl detecting the radiation emitted by an intruder around a wavelength ⁇ 1 , and an anti-masking device detecting, using infrared radiation of wavelength X 2 , the existence of masking of the intruder detection device, and electronic means intended to trigger an alarm when the presence of an intruder or masking has been detected.
  • An invention of this kind is known from patent GB 1 603 306.
  • a passive infrared intruder detection device includes a pyroelectric detector, which detects the infrared emission produced by a living being and in particular that produced by an intruder entering an unauthorized space placed under surveillance.
  • the principle of such a device is to detect the variations of infrared emission which is obtained by segmenting the scanning of the area under surveillance using a network of mirrors which focus on the pyroelectric detector the infrared emission emitted. This emission has a maximum for wavelengths from 8 to 10pm.
  • GB patent 1,603,306 uses a system detecting a masking operation using a second infrared radiation having a wavelength of 0.9 ⁇ m emitted by a transmitter and received by a receiver.
  • This 0.9 ⁇ m transmitter and receiver are placed in the same case as the pyroelectric detector and use the same input window to operate.
  • the principle of this anti-masking is to exploit the reflection coefficient presented by the masking element. This can be a sheet of paper or metal, a rigid obstacle, a projection of a powdery product or others. In all these cases the light emitted at 0.9pm by the transmitter is reflected by the masking element and returned to the detector at 0.9pm located nearby. When such a masking action is detected, electronic means activate an alarm.
  • the masking element may not have a sufficient coefficient of reflection, that is to say absorb the radiation at 0.9 pm. It may for example be black paint. In this case the detector at 0.9pm will receive little or no light and will not detect the presence of the masking element.
  • the fixed arrangement of the transmitter and the receiver at 0.9pm means that, even in the case of a sufficient reflection coefficient, it is sufficient for the masking element to be tilted to reflect light out of the direction of the detector. If the masking element is very close to the device, the chances that it will detect the masking are not zero. But if the masking element is placed at a significant distance, in the form of an obstruction, then it is unlikely that the reflected light will reach the detector at 0.9 pm. However, it is very easy to imagine situations where obstacles can be installed during a period when the device was inoperative. This is the case for public or semi-public places in which an intruder can break in during the day to perform a masking operation, when the system is stopped, and then return when the system has been restarted for watch over places then deserted.
  • the device will detect an absence of masking when no radiation at 0.9 ⁇ m has been detected by the detector at 0.9 ⁇ m. Now it is quite obvious that if either the transmitter or the detector breaks down, no signal will appear which will be interpreted as a non-masking situation.
  • the device according to this patent is therefore either unreliable or ineffective in a large number of conventional situations.
  • the aims of the present invention are therefore to make the device reliable and operating for a high number of situations including the few cases which have just been mentioned.
  • the passive infrared detector D1, the transmitter E2 and the detector D2 at the wavelength ⁇ 2 are arranged in a box placed at a certain height, for example around the ceiling on a wall of an area under surveillance, and opposite the housing, at another end of the area under surveillance is arranged a reflector, for example a mirror M, so that the light emitted by the emitter E2, is reflected on the mirror M and returns to the detector D2.
  • the arrangement of these elements is adjusted at the start so that the light flux F received by the detector D2 is very precisely defined.
  • It can be an absorbent masking element or deflecting the radiation A 2 so that the detector D2 receives a zero luminous flux, therefore different from the expected luminous flux F. It may also be a masking element reflecting the X 2 radiation towards the detector D2 in which case the detector D2 receives a light flux greater than the expected light flux F.
  • a comparison device C2 is connected which determines whether the light flux received is equal or not to the expected light flux F. For this, an electronic window is defined formed by two reference values V1 and V2 between which the value of the received signal must lie.
  • the signal from the comparison device C2 is stored in a storage element, for example a flip-flop.
  • the signal emitted by the detector D2 is inside the electronic window, it changes the output of the flip-flop to a certain logical state. If, on the contrary, this signal is not understood inside the electronic window, the output of the flip-flop goes to the reverse logic state of the previous one. In the latter case, the scale operates, for example using a loop circuit, on an alarm center which then activates an audible or visual alarm.
  • the ⁇ 2 radiation which has a shorter wavelength than the ⁇ 1 radiation, is used for this anti-masking system because it is possible to obtain a directive beam which is detectable by the detector D2 after reflection on the mirror M.
  • the focusing of the beam is obtained for example using lenses, either molded plastic or glass.
  • a masking which may be at short or long distance from the housing.
  • This masking can be carried out in the form of a spraying of a product, or of an obstacle reflecting or obscuring the beam.
  • the transmitter E2 and the detector D2 are placed very close to the detector Dl, so that a masking operation of the detector Dl also creates a masking of the detector D2 and of the transmitter E2. It is of course obvious that the intruder will be tempted to mask only the detector Dl and to leave in operation the anti-masking system consisting of the transmitter E2 and the detector D2.
  • the window is produced in a material which constitutes a filter by stopping the visible part of the spectrum while letting the wavelengths X 2 and ⁇ 1 pass .
  • selective masking of the detector D1 becomes more difficult.
  • the intruder detection device has short-distance masking detection means consisting of an infrared emitter El operating at around the wavelength, ⁇ 1 , this emitter being located very close and in front of the window outside the shoemaker.
  • This emitter El is very small compared to the observation field of the detector Dl, so that it does not obscure the infrared beam which is emitted by the intruder.
  • This transmitter El tests at a very short distance the operation of the detector Dl and detects a masking of the window.
  • This emitter El is, for example, made up of a resistor deposited by screen printing on a very small alumina substrate, for example of dimensions 5 mm ⁇ 5 mm.
  • the transmitter El is put into operation for a limited time each time the intruder detection device is restarted. This start-up can be validated by the result of the comparison carried out by the comparison device C2.
  • the result of the comparison is stored in a storage element, and when the signal emitted by the detector D2 is inside the electronic window already defined, the storage element validates the activation of the transmitter El.
  • the output of the detector D1 can then validate in a central alarm unit the correct operating state of the masking detection means.
  • the transmitter El by simulating the existence of an intruder, could act to operate the alarm of the alarm center.
  • the latter therefore has means which modify the normal operation of the alarm center so that during the limited start-up period the alarm center interprets the existence of radiation at wavelength ⁇ 1 , as concerning a procedure for test and not as characterizing the presence of an intruder.
  • the description of the masking detection means which have just been described shows that a zero light flux received by the detectors Dl or D2 corresponds to a masking action of the device. This requires that all the constituent elements of the intruder detection device are in a correct operating state.
  • the intruder detection device is provided with self-checking means which tests the correct operating state of the transmitters El and E2 and of the detectors Dl and D2.
  • a generator delivers an electrical signal of limited duration which, within the framework of a starting procedure, operates the transmitter E2 and the detector D2 on the one hand, then the transmitter El and the detector Dl d ' somewhere else.
  • the self-checking means comprise the masking detection means which have just been described, to which is added an element for validating the start-up procedure.
  • This validation element is for example a flip-flop which stores in the form of a logic state, the result of the start-up procedure operating on the channels X l and ⁇ 2 . Indeed, when the detector D2 has detected the X 2 radiation and when the detector D1 has detected the radiation 11, the alarm center receives the information that no masking has been detected and that all of the components constituting both channels are in a correct operating state.
  • the validation element stores this information and validates the following period corresponding to the permanent operation of the intruder detection.
  • the operating principle is as follows. After a period of shutdown, the intruder detection device is restarted by the user.
  • the alarm center connected for example by a loop circuit to various intruder detection devices, sends a start signal to the generator which delivers a pulse of duration T.
  • This generator activates the transmitter E2 which supplies the X 2 radiation received by the D2 detector.
  • the comparison device C2 compares the signal emitted by the detector D2 with the values of the electronic window. The result of the comparison is stored in a flip-flop during period T. If the signal sent is not included in the electronic window, the flip-flop acts on the alarm center which activates an alarm.
  • the flip-flop validates the activation of the transmitter El which supplies the radiation ⁇ 1 received by the detector Dl.
  • the signal emitted by the detector Dl is stored in the validation element located in the alarm center. At the end of the period of duration T, depending on the logic state stored by the validation element, this validates the permanent operation of the detector Dl if the two channels ⁇ 1 and X 2 have operated correctly or on the contrary activates the alarm of the alarm center if the operation of the two channels ⁇ 1 or X 2 has been disturbed.
  • the light beam of wavelength ⁇ 2 which is reflected by the mirror thus constitutes an optical barrier.
  • the masking and self-monitoring detection sequences are adapted to the number of infrared barriers thus arranged. This sequence can be carried out in the electrical signal generator. ques periodicals.
  • N the number
  • the generator delivers N signals of duration T consecutively. These signals actuate for example a counter or a shift register, which has N outputs each connected to a transmitter. Thus each transmitter is operated separately.
  • the comparison device C2 placed at the output of the single detector D2, detects as beforehand that each optical barrier has delivered its information.
  • the signal, at the output of the comparison device C2, representative of a value included within the limits of the electronic window, is used to actuate, for example a shift register with N stages, which in this way accounts for the N correct operating states. N optical barriers. By the logic state which appears at the end of the N periods at the output of the Nth register, the latter provides the information concerning the correct operating state of the N light barriers, and acts on the validation element of the alarm center.
  • N transmitters E2 and N detectors D2 it is also possible to use simultaneously N transmitters E2 and N detectors D2 in which case the validation element of the alarm center is activated only if the N light barriers have delivered information of a correct operating state.
  • the intruder detection device which has just been described is designed to make it difficult for an intruder to be able to selectively mask the passive infrared detector D1.
  • the beams at A 2 and at ⁇ 1 must pass through the entry window so that the sections of the beams through the window are sensi clearly superimposed.
  • the path of the two beams merge at the input of the intruder detection device so that it is impossible to mask one without masking the other.
  • the two beams are separated inside the housing using a dichroic mirror which returns one of the two beams and transmits the other beam.
  • the beam at 0.9pm after being reflected by the mirror M placed at the end of the area under surveillance, arrives at the entrance of the intruder detection device on a dichroic mirror inclined relative to the beam direction at 0.9 ⁇ m. This is thus diverted to the detector D2 placed for example in the housing.
  • the same self-checking means of the transmitter E2 and of the detector D2 exist as before.
  • an emitter E3, analogous to the emitter El, and replacing it, can be placed after the dichroic mirror inside the housing very close to the detector Dl so as to ensure only the means of self-checking. .
  • the mask detection means comprises the electri signal generator - c, the emitter E2, the detector D2 and C2 comparison device.
  • the self-checking means include these masking detection means as well as the emitter E3, the detector D1 and the validation element.
  • the output signal from the comparison device C2 is stored in a flip-flop which controls the operation of the transmitter E3.
  • the detector Dl can be provided with a filter which stops low wavelengths, for example less than 5 pm, in order to reduce the electrical fluctuations constituting noise which would appear at the output of the Dl detector.
  • the emitter E2 and the detector D2 can operate at other wavelengths situated in the infrared, for example 1.3 ⁇ m or 1.5 ⁇ m without departing from the scope of the invention.
  • the reflector preferably consists of a mirror. But it is also possible to use the reflecting power of other elements, for example the walls of the area under surveillance.
  • the transmitter E2 12 emits a directional beam 21 towards the mirror 20 placed at the end of the zone placed under surveillance.
  • the mirror 20 is shown near the housing 10 but in reality it is located at a much more distant distance, that is to say at the end of the area placed under surveillance.
  • the directional beam 22 reflected by the mirror 20 arrives at the detector 13 through a focusing lens 14.
  • the detector Dl 15 is located inside the housing 10 at the focus of a faceted mirror 16 which focuses the infrared beam coming from the intruder.
  • the detector D1 15 therefore receives by each element of the faceted mirror a beam similar to the beam 23.
  • the movement of the intruder allows this generation of different beams 23. It is these variations in received flux which allow the detector D1 to detect the presence of an intruder.
  • a high-pass filter 17 which cuts the wavelengths lower, for example at 5 pm. This allows the detector Dl to output an electrical signal where the noise component has been attenuated.
  • the transmitter El 18 which emits radiation around the wavelength ⁇ 1 according to the beam 24. This is reflected on the faceted mirror 16 to reach the detector D1 15.
  • the emitter E1 18 is fixed integrally to the housing 10 using a fixing arm 25 which also carries the connection wires for the electrical signals.
  • the emitter E1 is small in size so as not to obscure the observation field of the detector D1 too much.
  • each reflected directive beam 22 arrives either on a single D2 detector 13, or on several identical D2 detectors according to the layout of the premises.
  • FIG. 2 an electrical block diagram of the intruder detection device is shown.
  • a generator 30 of an electrical signal of duration T actuates the emitter E2 12, the emitted radiation of which is detected by the detector D2 13.
  • the latter is connected at the output to a comparison device C2 32.
  • the comparison device C2 32 receives the output signal from detector D2 and compares it to two reference values rence VI and V2. When the output signal of the detector D2 is between these two values, the comparison device C2 delivers a signal corresponding for example to the logic signal "1". Likewise, when the output signal of the detector D2 is outside this window of values, then the comparison device C2 delivers a signal corresponding to the reverse logic state of the previous state, ie "0" in the example.
  • FIG. 3 The time diagram for these different signals is represented in FIG. 3.
  • the signals present on the connections 35 and 36 of FIG. 2 are represented in FIG. 3 respectively under the reference 1 and under marks 2 and 3 depending on whether a masking action has not been or has been detected.
  • Signal 1 indicates that for a limited time T the transmitter E2 is operating.
  • the signal 2 of FIG. 4 appears, that is to say that the signal 1 was emitted by C2.
  • the signal 3 of figure 4 it is about an absence of detection, that is to say of a failure of E2 or D2, or of the fact that an action masking has been detected.
  • the output of flip-flop 37 activates the alarm of the central alarm 40 using the validation element 38.
  • flip-flop 37 activates the emitter El 41 which supplies infrared radiation ⁇ 1 detected by the detector Dl 42.
  • the output signal thereof arrives at the validation element 38. If a signal has not been detected by the detector Dl 42 , the validation element triggers the alarm of the alarm center. If, on the contrary, a signal has been detected, the validation element 38 validates the end of the period of limited duration T, which has the effect of restoring the autonomy of the alarm center to intervene in the event of detection of radiation at wavelength ⁇ 1 by the detector Dl
  • the intruder detection device is then in its permanent operating state to detect an intruder.
  • FIG. 4 represents a second variant of the intruder detection device. It differs from the previous one by the dichroic mirror 50 placed behind the entry window 11.
  • the reflected light beam 22 coming from the emitter E2 12 is reflected by the dichroic mirror 50 according to the beam 51 which arrives at the detector D2 13 of which the entry face has been directed towards the beam 51.
  • the beam 23 coming from the intruder crosses the dichroic mirror 50 to come to the detector Dl 15 after having been reflected by the faceted mirror 16.
  • the two beams are therefore dissociated according to their wavelength.
  • the beams 22 and 23 passing through substantially the same part of the input window 11 any masking of the window will affect the two beams.
  • an E3 52 transmitter is placed inside the housing and only performs a self-checking function. The electrical operation remains the same.
  • the faceted mirror which segments the scanning of the area under surveillance can be replaced by a Fresnel lens.
  • the Fresnel lens is arranged, after the high-pass filter 17, substantially perpendicular to the beam 23, the detector Dl 15 then facing the direction of arrival of the beam 23.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Burglar Alarm Systems (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
  • Geophysics And Detection Of Objects (AREA)
EP85201873A 1984-11-30 1985-11-14 Intrusionsdetektoranlage mit Antimaskierungsvorrichtung Expired - Lifetime EP0186226B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8418288A FR2574200B1 (fr) 1984-11-30 1984-11-30 Dispositif de detection d'intrus muni d'un dispositif d'antimasquage
FR8418288 1984-11-30

Publications (2)

Publication Number Publication Date
EP0186226A1 true EP0186226A1 (de) 1986-07-02
EP0186226B1 EP0186226B1 (de) 1990-02-28

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EP85201873A Expired - Lifetime EP0186226B1 (de) 1984-11-30 1985-11-14 Intrusionsdetektoranlage mit Antimaskierungsvorrichtung

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US (1) US4752768A (de)
EP (1) EP0186226B1 (de)
JP (1) JPS61131198A (de)
DE (1) DE3576231D1 (de)
FR (1) FR2574200B1 (de)

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EP0289621A1 (de) * 1986-10-31 1988-11-09 Takenaka Engineering Co. Ltd. Passives infrarot-einbruchmessfühler, ausgerüstet mit sichtfeldunterbrechungsüberwachungsmechanismus
EP0375270A2 (de) * 1988-12-22 1990-06-27 Guardall Limited Einrichtung und Verfahren zur Strahlungserfassung
EP0481934A1 (de) * 1990-10-19 1992-04-22 ELKRON S.p.A. Antimaskierungsvorrichtung für Sicherheitssysteme
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EP0507025A2 (de) * 1991-04-04 1992-10-07 Guardall Limited Verfahren und Vorrichtungen zur Aufspürung eines Eindringlings
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JP2005241556A (ja) * 2004-02-27 2005-09-08 Optex Co Ltd 受動型赤外線感知器、およびそれに用いられる妨害検知システム
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GB2426577A (en) * 2005-05-27 2006-11-29 Thorn Security An optical detector with a reflector outside of its housing, and a plurality of sensors inside of its housing
GB2426578A (en) * 2005-05-27 2006-11-29 Thorn Security A flame detector having a pulsing optical test source that simulates the frequency of a flame
GB2453484B (en) * 2006-07-27 2009-12-02 Visonic Ltd Passive infrared detectors
US8319638B2 (en) * 2007-11-14 2012-11-27 Honeywell International Inc. Motion detector for detecting tampering and method for detecting tampering
EP2128832A1 (de) * 2008-05-30 2009-12-02 Robert Bosch GmbH Abdecküberwachungssystem und -verfahren für Bewegungsdetektoren
EP2453426B2 (de) * 2010-11-15 2021-03-17 Cedes AG Überwachungssensor mit Selbsttest
WO2013072916A1 (en) 2011-11-16 2013-05-23 Visonic Ltd. Motion detection systems and methodologies
GB2506885B (en) * 2012-10-10 2017-04-12 Read Dale Occupancy sensor
CN104627030A (zh) 2013-11-13 2015-05-20 光宝科技股份有限公司 载具安全系统及应用于其上的安全侦测与处理方法
US9405120B2 (en) 2014-11-19 2016-08-02 Magna Electronics Solutions Gmbh Head-up display and vehicle using the same
US10012548B2 (en) * 2015-11-05 2018-07-03 Google Llc Passive infrared sensor self test with known heat source
EP4174814A1 (de) 2021-10-26 2023-05-03 Carrier Fire & Security EMEA BV Bewegungsdetektor mit maskierungsdetektion

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Cited By (15)

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Publication number Priority date Publication date Assignee Title
EP0289621A4 (de) * 1986-10-31 1990-07-03 Takenaka Eng Co Ltd Passives infrarot-einbruchmessfühler, ausgerüstet mit sichtfeldunterbrechungsüberwachungsmechanismus.
EP0289621A1 (de) * 1986-10-31 1988-11-09 Takenaka Engineering Co. Ltd. Passives infrarot-einbruchmessfühler, ausgerüstet mit sichtfeldunterbrechungsüberwachungsmechanismus
EP0375270A2 (de) * 1988-12-22 1990-06-27 Guardall Limited Einrichtung und Verfahren zur Strahlungserfassung
EP0375270A3 (de) * 1988-12-22 1991-07-10 Guardall Limited Einrichtung und Verfahren zur Strahlungserfassung
US5091648A (en) * 1988-12-22 1992-02-25 Racal-Guardall (Scotland) Limited Radiation detection arrangements and methods
US5243326A (en) * 1990-10-19 1993-09-07 Elkron S.P.A. Device for protecting components of security systems against obstruction
EP0481934A1 (de) * 1990-10-19 1992-04-22 ELKRON S.p.A. Antimaskierungsvorrichtung für Sicherheitssysteme
EP0499177A1 (de) * 1991-02-11 1992-08-19 BITRON VIDEO S.r.l. Eindringmeldealarm
EP0507025A3 (en) * 1991-04-04 1993-02-24 Racal-Guardall (Scotland) Limited Intruder detection arrangements and methods
EP0507025A2 (de) * 1991-04-04 1992-10-07 Guardall Limited Verfahren und Vorrichtungen zur Aufspürung eines Eindringlings
EP0556898A1 (de) * 1992-02-17 1993-08-25 Aritech B.V. Eindringalarmsystem
US5499016A (en) * 1992-02-17 1996-03-12 Aritech B.V. Intrusion alarm system
US5831529A (en) * 1996-07-04 1998-11-03 Aritech B.V. Security system implemented with an anti-masking dector using light guides
EP1061489A1 (de) * 1999-06-07 2000-12-20 Siemens Building Technologies AG Intrusionsmelder mit einer Einrichtung zur Sabotageüberwachung
US6377174B1 (en) 1999-06-07 2002-04-23 Siemens Technologies Ag, Cerberus Division Intrusion detector having a sabotage surveillance device

Also Published As

Publication number Publication date
FR2574200B1 (fr) 1987-01-23
DE3576231D1 (de) 1990-04-05
EP0186226B1 (de) 1990-02-28
FR2574200A1 (fr) 1986-06-06
US4752768A (en) 1988-06-21
JPS61131198A (ja) 1986-06-18

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