EP1093100B1 - Capteur infrarouge passif - Google Patents

Capteur infrarouge passif Download PDF

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Publication number
EP1093100B1
EP1093100B1 EP99120434A EP99120434A EP1093100B1 EP 1093100 B1 EP1093100 B1 EP 1093100B1 EP 99120434 A EP99120434 A EP 99120434A EP 99120434 A EP99120434 A EP 99120434A EP 1093100 B1 EP1093100 B1 EP 1093100B1
Authority
EP
European Patent Office
Prior art keywords
channel
alarm
masking
infrared
signals
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
EP99120434A
Other languages
German (de)
English (en)
Other versions
EP1093100B8 (fr
EP1093100A1 (fr
Inventor
Hansjürg Dr. Mahler
Stefan Hegnauer
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
Siemens Building Technologies 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
Priority to DE59909695T priority Critical patent/DE59909695D1/de
Application filed by Siemens Building Technologies AG filed Critical Siemens Building Technologies AG
Priority to EP99120434A priority patent/EP1093100B8/fr
Priority to AT99120434T priority patent/ATE282291T1/de
Priority to ES99120434T priority patent/ES2226259T3/es
Priority to IL13820900A priority patent/IL138209A/xx
Priority to US09/689,993 priority patent/US6262661B1/en
Publication of EP1093100A1 publication Critical patent/EP1093100A1/fr
Application granted granted Critical
Publication of EP1093100B1 publication Critical patent/EP1093100B1/fr
Publication of EP1093100B8 publication Critical patent/EP1093100B8/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
    • 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

Definitions

  • the present invention relates to a passive infrared detector with an entry window for Infrared radiation, an infrared sensor with an evaluation circuit and an optical one Transmitter and an optical receiver anti-mask device for detection of processes or visual changes immediately before the detector and / or of Changes in the optical properties of the entrance window.
  • Antimask devices as described, for example, in EP-A-0 186 226 and in EP-A-0 499 177 and described in EP-A-0 556 898 are used to identify attempts at sabotage on the detector, such as covering the entrance window with a film or a Cover or spray the entrance window with an infrared opaque spray, such as for example hair lacquer.
  • the optical transmitter and the optical receiver of the anti-mask device are usually formed by an infrared LED and an infrared photodiode. To detect changes in the optical properties of the entrance window, this is exposed to infrared radiation and it becomes the radiation that penetrates the entrance window or is reflected by it measured.
  • the signals from the optical receiver are used to evaluate the signals of the anti-mask device compared with threshold or reference or general voltage values that or below and must be kept for a certain period of time.
  • the evaluation itself is carried out according to one of two methods, with each anti-mask device always works according to one of the two methods.
  • One method is the so-called Proximity Latch (PL) Method in which a masking alarm is reached when the predetermined criteria are reached is triggered, which remains active and only by an authorized person in a predetermined Expiration can be postponed. So the PL process reacts quickly and sharply, but also triggers an alarm when there is a short movement without masking intention, which does not automatically reset, but requires the intervention of an operator.
  • the second procedure is the so-called Real Time (RT) process, in which only sufficiently large and sufficient stable changes trigger a masking alarm that when the signals return to normal is automatically withdrawn. The RT process reacts more slowly and tends to less sharp, but has the advantage of automatic alarm cancellation.
  • RT Real Time
  • the invention is now to provide a passive infrared detector with a masking device that are both more robust against false alarms and more sensitive having.
  • this object is achieved in that the evaluation of the signals of the Anti-masking takes place in two channels, the one, hereinafter referred to as the PL channel, Channel for a limited time and the other, hereinafter referred to as the RT channel Channel reacts to temporally stable processes or changes, and that a combined evaluation of the signals of the two channels.
  • the PL and the RT method are therefore used linked with each other, the big advantage of this link is that the Threshold or reference values in the individual channels lowered or possibly completely can be dropped.
  • the latter can be the case if the signals are with fuzzy logic or evaluated in a neural network.
  • a first preferred embodiment of the passive infrared detector according to the invention is characterized in that in each channel an examination of the respective signal by Comparison with at least one threshold or reference value or using fuzzy logic takes place, and that the combined evaluation by linking the test results is formed in the two channels.
  • a second preferred embodiment of the passive infrared detector according to the invention is characterized in that in each channel in addition to that corresponding to the respective alarm level Threshold or reference value defines different values for pre-alarm levels and that the signals are compared with the stages mentioned.
  • a third preferred embodiment of the passive infrared detector according to the invention is characterized in that the combined evaluation of the signals of the two channels of Anti-mask device with the one taking place in a channel referred to below as the PIR channel Evaluation of the signals from the infrared sensor is combined, and that the triggering of Intrusion or masking alarms occur due to the signals in all three channels.
  • This preferred embodiment represents a further increase in robustness against false alarms by making the detector largely immune to insect interference. If a larger insect moves close to the entrance window, this can lead to that an alarm signal is triggered in the PIR channel. Because the insect also in the PL channel would trigger an alarm signal, you can do that on the basis of the alarm signal in the PL channel block in the PIR channel. An alarm signal in the PIR channel without a simultaneous alarm signal in the PL channel would be a real intrusion alarm, however, and an alarm signal in the PIR channel with simultaneous An alarm signal in the PL and RT channels would be a masking attempt.
  • FIG. 1 shows a longitudinal section through a passive infrared detector according to the invention in the Direction perpendicular to its rear wall or floor and
  • FIG. 2 shows a view from behind, with the rear wall of the detector removed and the one focussing the incident infrared radiation Mirror is removed from the detector.
  • the passive infrared detector is shown essentially of a two-part housing with a bottom 1 and a cover 2, from an entry window 3 provided in the cover 2 for the one to be monitored Infrared radiation falling on the detector from a circuit board located inside the detector 4, on which, among other things, an infrared sensor 5 and an evaluation circuit 6 are arranged are, and from a mirror 7 also arranged inside the detector for focusing the infrared radiation incident through the entrance window 3 onto the infrared sensor 5.
  • the entrance window 3, which consists for example of polyethylene or polypropylene and is only permeable to radiation in the wavelength range of about 5 to 15 ⁇ m, is in one beveled or concave part of the lid 2 used and laterally by projections F of the lid 2 limited.
  • the mirror 7 is designed so that it emits radiation in the near infrared absorbed and reflected body radiation. With regard to the shape of the mirror, reference is made to EP-A-0 303 913 and with regard to the mirror material to EP-A-0 707 294.
  • the entrance window 3, the mirror 7, the infrared sensor 5 and the evaluation circuit 6 are used for detection of a person entering the monitored room.
  • the entrance window 3 can be used as a Fresnel lens be formed and instead of the mirror 7, the infrared radiation on the infrared sensor 5 focus.
  • the passive infrared detector shown is with a so-called anti-mask device for detection of processes or visual changes immediately before the detector and of changes the optical properties of the entrance window 3, in particular sabotage of the Detector, equipped.
  • sabotage is used to manipulate the detector in such a way that No infrared radiation can reach the infrared sensor, so that unauthorized persons can no longer be detected and can move freely in the monitored room.
  • sabotage is usually perpetrated during the disarming of the detector when it is in a stand-by mode is switched on and there are no alarms in the monitored room trigger.
  • Known sabotage or masking methods are covering the detector with a suitable one Object, such as a box, hat or umbrella, and spraying the entrance window with an infrared-opaque spray, such as adhesive or hairspray.
  • Modern passive infrared detectors are said to be capable of such masking to be detected automatically, preferably at the time of masking or at the latest when the detector or the system is armed.
  • the detector's anti-mask device is designed to use the two masking methods mentioned can surely recognize.
  • an optical transmitter 8 for example an infrared LED with 950 nm wavelength
  • an optical receiver 9 for example an infrared photodiode
  • the transmitter 8 constantly emits infrared radiation from the detector, which is normal Operating state in the monitoring room before the detector is emitted.
  • a large part of the Radiation emitted by the transmitter 8 is reflected and passes through the entrance window 3 the receiver 9.
  • the resulting increase in received radiation is called a masking attempt interpreted.
  • Transmitter 10 for example an infrared LED, arranged in a light shaft 11 infrared radiation sends.
  • the light shaft 11 is angled and opens into an infrared transparent Window 12, which in the side window facing the entrance window 3 of the relevant projection F is provided.
  • this projection F is that Transmitter 8 adjacent and opposite the receiver 9 projection.
  • the additional Transmitter 10 emitted infrared radiation passes through the light shaft 11 via a Mirror 11a and window 12 at a flat angle of incidence on entrance window 3 and passes through it under normal conditions. Through the window 12 Radiation emitted by the additional transmitter 10 is focused on the center of the entrance window 3 and passes through it to the receiver 9.
  • the evaluation circuit 6 contains one connected to the infrared sensor 5 PIR channel 13 and two channels connected to the optical receiver 9, a PL channel 14 and an RT channel 15.
  • the outputs of all three channels are led to a stage 16, in which the signals of these channels are linked.
  • the result of this link forms the basis for the decision to issue an alarm signal by the detector.
  • only the outputs of the PL channel 14 and the RT channel 15 can be connected to one another to be linked.
  • the PIR channel 13 is the channel present in each passive infrared detector for evaluating the Signal from the infrared sensor exposed to the infrared radiation from the monitored room 5. A signal is available at the output of this channel, which indicates the penetration of infrared radiation emitting object in the monitored room.
  • the PIR channel 13 is assumed to be known, so that a detailed description is dispensed with.
  • the PL channel 14 and the RT channel 15 serve to evaluate the anti-task signal of the optical Receiver 9, where PL stands for Proximity Latch and RT for Real Time. Sampling rate and The resolution is chosen so that it is sufficient for both channels. So probably in PL channel 14 as well as in RT channel 15, the signal of the optical receiver 9 with an alarm threshold and preferably also compared with several pre-alarm thresholds, so that at the exit of the relevant channel information of the type small, medium or large signal are available.
  • the pre-alarm thresholds not only have the advantage that they result in further logical combinations possible, but also that compliance with country-specific regulations is made easier becomes.
  • This mode is typical of an operating mode in which the system is activated by the personnel before arming it is checked on which occasion any masking alarms are reset can.
  • the RT channel 15 reacts to time-stable, that is, longer, exceedances the relevant threshold or reference values.
  • a masking alarm is only triggered if if the crossing is long enough.
  • the masking alarm is without intervention automatically reset as soon as the limit disappears and the detector returns to its normal state.
  • a pre-alarm signal in PL channel 14 i.e. a threshold of 50% of the alarm value has been exceeded, and if subsequently in RT channel 15 long pre-alarm signal occurs, then this indicates masking and it becomes a masking alarm triggered.
  • a threshold of 50% of the alarm value With the previously isolated use of the PL or RT channel, it would be however, no alarm was triggered.
  • an alarm signal in PL channel 14 occurs if there is no pre-alarm signal in RT channel 15, it could be a larger insect or a person walking past the detector, and it therefore no alarm is triggered. You can see from these two examples that the link or combined evaluation of the PL channel 14 and the RT channel 15 on the one hand to a higher one Sensitivity and on the other hand leads to a higher robustness.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Glass Compositions (AREA)
  • Burglar Alarm Systems (AREA)

Claims (9)

  1. Détecteur infrarouge passif comprenant une fenêtre (3) d'entrée pour du rayonnement infrarouge, un capteur (5) d'infrarouge ayant un circuit (6) d'interprétation et un dispositif antimasque qui comprend un émetteur (8, 10) optique et un récepteur (9) optique et qui est destiné à détecter des événements ou des modifications optiques juste devant le détecteur et/ou des modifications des propriétés optiques de la fenêtre (3) d'entrée, caractérisé en ce que l'interprétation des signaux du dispositif antimasque s'effectue dans deux canaux (14, 15), l'un (14) d'entre eux, désigné ci-après par canal PL, réagissant à des événements ou à des modifications limités dans le temps et l'autre (15) d'entre eux désigné dans ce qui suit par canal RT, à des événements ou des modifications stables dans le temps et en ce qu'il est effectué une interprétation combinée des signaux des deux canaux (14, 15).
  2. Détecteur infrarouge suivant la revendication 1, caractérisé en ce qu'il s'effectue dans chaque canal (14, 15) une étude du signal respectif par comparaison avec au moins une valeur de seuil ou de référence ou au moyen d'une logique floue et en ce que l'interprétation combinée est formée par une combinaison logique des résultats de l'étude dans les deux canaux (14, 15).
  3. Détecteur infrarouge suivant la revendication 2, caractérisé en ce qu'il est défini dans chaque canal (14, 15), en plus de la valeur de seuil ou de référence correspondant aux paliers d'alerte respectifs ou en plus de la règle correspondante de la logique floue, diverses valeurs ou règles de paliers de pré-alerte et en ce qu'une comparaison des signaux avec les paliers mentionnés est effectuée.
  4. Détecteur infrarouge suivant la revendication 3, caractérisé en ce qu'en présence d'un signal de pré-alerte dans le canal (14) PL et dans le canal (15) RT, il est effectué un déclenchement de l'alerte de masquage.
  5. Détecteur infrarouge suivant la revendication 3, caractérisé en ce qu'en présence d'un signal d'alerte dans le canal (14) PL sans signal de pré-alerte simultané dans le canal (15) RT, il ne se produit pas de déclenchement d'une alerte de masquage.
  6. Détecteur infrarouge suivant l'une des revendications 1 à 5, caractérisé en ce que l'interprétation combinée des signaux des deux canaux (14, 15) du dispositif d'antimasque est combinée à l'interprétation, s'effectuant dans un canal (13), désigné ci-après par canal PIR, des signaux du capteur (5) d'infrarouge et en ce que le déclenchement d'alerte d'intrusion ou de masquage s'effectue sur la base des signaux dans tous les trois canaux (13, 14, 15).
  7. Détecteur infrarouge suivant la revendication 6, caractérisé en ce que, s'il y a présence simultanée d'une alerte de masquage dans le canal (14) PL et d'une alerte d'intrusion dans le canal (13) PIR, il se produit une suppression de l'alerte d'intrusion.
  8. Détecteur infrarouge suivant l'une des revendications 1 à 7, caractérisé en ce que le dispositif antimasque a deux émetteurs (8, 10) optiques, dont le premier (8) est disposé à l'extérieur sur la face avant du détecteur et expose à du rayonnement l'espace se trouvant juste devant le détecteur et dont le deuxième (10) est placé à l'intérieur du détecteur et diffuse son rayonnement sur la fenêtre (3) d'entrée.
  9. Détecteur infrarouge suivant la revendication 8, caractérisé en ce que le récepteur (9) optique reçoit le rayonnement, réfléchi de l'espace se trouvant juste devant le détecteur, du premier émetteur (8) optique et le rayonnement, que la fenêtre (3) d'entrée a laissé passer, du deuxième émetteur (10) optique.
EP99120434A 1999-10-14 1999-10-14 Capteur infrarouge passif Expired - Lifetime EP1093100B8 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP99120434A EP1093100B8 (fr) 1999-10-14 1999-10-14 Capteur infrarouge passif
AT99120434T ATE282291T1 (de) 1999-10-14 1999-10-14 Passiv-infrarotmelder
ES99120434T ES2226259T3 (es) 1999-10-14 1999-10-14 Detector infrarrojo pasivo.
DE59909695T DE59909695D1 (de) 1999-10-14 1999-10-14 Passiv-Infrarotmelder
IL13820900A IL138209A (en) 1999-10-14 2000-09-01 Passive infrared detector
US09/689,993 US6262661B1 (en) 1999-10-14 2000-10-13 Passive infrared detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP99120434A EP1093100B8 (fr) 1999-10-14 1999-10-14 Capteur infrarouge passif

Publications (3)

Publication Number Publication Date
EP1093100A1 EP1093100A1 (fr) 2001-04-18
EP1093100B1 true EP1093100B1 (fr) 2004-06-09
EP1093100B8 EP1093100B8 (fr) 2004-08-18

Family

ID=8239196

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99120434A Expired - Lifetime EP1093100B8 (fr) 1999-10-14 1999-10-14 Capteur infrarouge passif

Country Status (6)

Country Link
US (1) US6262661B1 (fr)
EP (1) EP1093100B8 (fr)
AT (1) ATE282291T1 (fr)
DE (1) DE59909695D1 (fr)
ES (1) ES2226259T3 (fr)
IL (1) IL138209A (fr)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE50103419D1 (de) 2001-11-05 2004-09-30 Siemens Building Tech Ag Passiv-Infrarotmelder
US7233243B2 (en) * 2004-01-09 2007-06-19 Ctrl Systems, Inc. Method of defense-in-depth ultrasound intrusion detection
US7034675B2 (en) * 2004-04-16 2006-04-25 Robert Bosch Gmbh Intrusion detection system including over-under passive infrared optics and a microwave transceiver
JP4576525B2 (ja) * 2004-05-07 2010-11-10 オプテックス株式会社 防犯センサ
US8138478B2 (en) * 2005-03-21 2012-03-20 Visonic Ltd. Passive infra-red detectors
JP4755685B2 (ja) * 2005-06-28 2011-08-24 ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング 表面上の液体を検出するためのセンサ装置
WO2007090458A1 (fr) * 2006-02-06 2007-08-16 Robert Bosch Gmbh Dispositif de detection d'obstruction
ES2405354T3 (es) * 2006-02-20 2013-05-30 Robert Bosch Gmbh Dispositivo de detección de obstrucción
US7733226B2 (en) * 2006-03-16 2010-06-08 Robert Bosch Gmbh Infrared intrusion detection device
US8017913B2 (en) * 2006-07-27 2011-09-13 Visonic Ltd. Passive infrared detectors
US7880603B2 (en) * 2006-10-09 2011-02-01 Robert Bosch Gmbh System and method for controlling an anti-masking system
EP2128832A1 (fr) * 2008-05-30 2009-12-02 Robert Bosch GmbH Système anti-masquage et procédé de détecteurs de mouvements
TW201121819A (en) * 2009-12-28 2011-07-01 Hon Hai Prec Ind Co Ltd Prompting device and prompting method thereof
EP2498232A1 (fr) * 2011-03-10 2012-09-12 Siemens Aktiengesellschaft Détecteur
GB2509884B (en) 2011-11-16 2018-10-17 Tyco Fire & Security Gmbh Motion detection systems and methodologies
PL3501017T3 (pl) 2016-08-18 2021-02-08 Robert Bosch Gmbh Czujnik ruchu z ochroną antymaskową

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3369019D1 (en) * 1982-10-01 1987-02-12 Cerberus Ag Infrared detector for spotting an intruder in an area
US4709153A (en) * 1983-06-09 1987-11-24 Shorrock Security Systems Limited Intruder detector
FR2574200B1 (fr) * 1984-11-30 1987-01-23 Labo Electronique Physique Dispositif de detection d'intrus muni d'un dispositif d'antimasquage
US4982094A (en) * 1986-10-31 1991-01-01 Takenaka Engineering Co., Ltd. Passive type crime-preventing infrared sensor provided with a mechanism of monitoring an obstruction for the visual field
IT1245405B (it) * 1991-02-11 1994-09-20 Bitron Video Dispositivo anti-intrusione
NL9200283A (nl) * 1992-02-17 1993-09-16 Aritech Bv Bewakingssysteem.
IL119372A (en) * 1995-11-03 2000-02-17 Siemens Building Tech Ag Passive infrared intruder detector

Also Published As

Publication number Publication date
US6262661B1 (en) 2001-07-17
IL138209A0 (en) 2001-10-31
DE59909695D1 (de) 2004-07-15
EP1093100B8 (fr) 2004-08-18
ES2226259T3 (es) 2005-03-16
ATE282291T1 (de) 2004-06-15
IL138209A (en) 2003-12-10
EP1093100A1 (fr) 2001-04-18

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