EP1024465A1 - Détecteur passif à infrarouge - Google Patents

Détecteur passif à infrarouge Download PDF

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Publication number
EP1024465A1
EP1024465A1 EP99101920A EP99101920A EP1024465A1 EP 1024465 A1 EP1024465 A1 EP 1024465A1 EP 99101920 A EP99101920 A EP 99101920A EP 99101920 A EP99101920 A EP 99101920A EP 1024465 A1 EP1024465 A1 EP 1024465A1
Authority
EP
European Patent Office
Prior art keywords
passive infrared
infrared detector
detector according
sensors
monitoring
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.)
Withdrawn
Application number
EP99101920A
Other languages
German (de)
English (en)
Inventor
Kurt Dr. Müller
Martin Dr. Allemann
Dieter Wieser
Markus Dr. Loepfe
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
Application filed by Siemens Building Technologies AG filed Critical Siemens Building Technologies AG
Priority to EP99101920A priority Critical patent/EP1024465A1/fr
Publication of EP1024465A1 publication Critical patent/EP1024465A1/fr
Withdrawn legal-status Critical Current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
    • G08B13/18—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
    • G08B13/193—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 using focusing means

Definitions

  • the present invention relates to a passive infrared detector with a heat sensitive Sensor and with a focusing means for bundling the different radial Monitoring areas on the detector heat rays falling on the sensor.
  • Passive infrared detectors of this type have been known and widely used for years. You serve in particular to determine the presence or intrusion of unauthorized persons in a surveillance room by proof of the emitted by these people typical infrared radiation, which is directed onto the sensor by the focusing means becomes. Either Fresnel lenses are used as focusing means, which in the Integrated entrance windows for the infrared radiation are arranged on the front of the detector housing are (see, for example, EP-A-0 559 110), or an inside the detector housing arranged mirror, which consists of individual reflectors (see for example EP-A-0 303 913).
  • Both the Fresnel lenses and the mirrors are designed so that the one to be monitored Room covered with monitoring areas starting from the detector in a fan shape is. As soon as an object emitting heat radiation enters a surveillance area penetrates, the sensor detects the heat radiation emitted by this object, the detection being safest when the object is across the surveillance area emotional.
  • Such a new application would be a passive infrared detector, for example individual monitoring zones optionally, for example by an internal switch, active or inactive can be set. With such detectors one could have certain during the day Monitoring zones for visitor disruption or alarm, i.e. active, and the remaining zones switch inactive.
  • Another application would be to monitor one Room, for example the counter room of a bank, with video cameras, the cameras save the images if the image processing requires it. Since the cameras are used Surveillance of a room must be known to have a large opening angle and therefore the picture quality is generally poor, it would be desirable to get one Use a camera with a narrow viewing angle and thus higher resolution and use this Align the signal of an infrared detector to the area of interest to be able to.
  • the invention is now to provide a passive infrared detector, which not only detection but also localization of an intruder in its effective area enables.
  • the detector has at least two Has heat-sensitive sensors, and that the focusing means so constructed and is arranged that each surveillance area based on the number and number of sensors exposed to heat radiation can be clearly identified.
  • a first preferred embodiment of the detector according to the invention is characterized in that that the output signals from the sensors into a single, encoded sensor signal are summarized, which is the exposure of each sensor or has no sign indicating heat radiation, and that Such a coded sensor signal is assigned to each monitoring area.
  • a second preferred embodiment of the passive infrared detector according to the invention is characterized in that the focusing means consists of a number of focusing elements is built up, the number of which is greater than that of the monitoring areas, and that between the focusing elements and the monitoring areas there is clear mutual correlation.
  • the passive infrared detector is the focusing means by a mirror arrangement or by a Fresnel lens formed.
  • the mirror arrangement is preferably by a single one Focusing elements forming reflectors, mirrors formed.
  • the mirror for the passive infrared detector according to the invention about 85 mm wide, which should still be acceptable for many applications.
  • Another preferred embodiment of the passive infrared detector according to the invention is characterized in that the focusing means is designed such that a given coverage pattern of the monitoring areas to a fraction the partial area corresponding to the original opening angle is compressed and up to is repeated to achieve the original opening angle.
  • the focusing means e.g. with a mirror by appropriate resolution in partial mirror with simultaneous Downsizing of the focusing elements
  • an extremely dense coverage of the interstitial space can be achieved.
  • Another preferred embodiment of the passive infrared detector according to the invention is characterized in that tracking is based on the coded sensor signals the movement of an intruder through the various surveillance areas he follows.
  • the movement of an intruder is preferably between in the alarm decision the surveillance areas, whereby the criterion is that a Intruder from one surveillance area directly into an immediately adjacent one Surveillance area can move. In this way, malfunctions, the monitoring areas infested in any order as eliminated as not relevant. It also opens up the possibility of recognizing from the movement pattern that there is more than one intruder in the surveillance room, police are of great interest.
  • the focusing means of a passive infrared detector shown in Fig. 1 are by three (generally: several) conventional mirrors R, R ', R "formed, each of which a number of reflectors. Every mirror is a heat sensitive sensor for example a pyrosensor S, S 'or S "or a thermopile sensor (see European Patent Application No. 98 115 476) assigned. If in the description below Pyrosensor is mentioned, then this should not be understood as restrictive become. Of course, a Fresnel lens can also be used instead of the mirror R, R ', R " can be used, which is usually the case due to space and cost reasons becomes. The representation with the mirrors has been made for reasons of better comprehensibility chosen.
  • the individual reflectors are each individual mirror designed so that the area to be monitored is also from the detector outgoing surveillance areas is covered in a fan shape, with corresponding to at different distances from the detector several such "subject areas" or surveillance zones are provided.
  • these rows are the row containing the reflectors A n for the far zone, the row containing the reflectors B m for the middle zone, the row containing the reflectors C k for the near zone and the row containing the reflector D for the look zone.
  • the fan-shaped coverage is achieved by mutually displacing the reflectors of each row in the horizontal direction, the number of reflectors per row increasing with the distance of the respective monitoring zone from the detector in order to achieve an approximately uniform coverage pattern.
  • Each reflector "looks" into a certain solid angle of a certain zone, receives the incident heat radiation from this solid angle and focuses it on the assigned pyrosensor S.
  • the sensor detects the one emitted by this object Heat radiation, whereupon the detector emits an alarm signal.
  • This alarm signal indicates that an object, such as an intruder, is in the surveillance room, but does not allow any conclusions to be drawn about the exact position of the intruder in the surveillance room to.
  • a detector M is symbolically drawn in FIG. 2 and contains a mirror arrangement of the type shown in FIG. 1.
  • the detector M is mounted, for example, in a corner of a room to be monitored and covers the monitoring areas of the far zone designated with Ü1 to Ü7 (row with the reflectors A).
  • the surveillance areas of the other zones are not shown; in this connection reference is made to EP-A-0 303 913, in particular to FIG. 3 thereof.
  • Lines from the detector M to the monitoring areas Ü n indicate which reflector covers the relevant monitoring area, that is to say heat radiation from this monitoring area is applied to it.
  • a solid line symbolizes radiation to a reflector A of the mirror R
  • a dashed line a radiation to a reflector A 'of the mirror R'
  • a dash-dotted line shows radiation to a reflector A "of the mirror R".
  • the monitoring areas Ü1 to Ü7 are covered as follows: Surveillance area Coverage by reflector (s) Ü1 A1 (+ B1) Ü2 A2 '+ A2 " Ü3 A3 ' Ü4 A4 + A4 '+ A4 "(+ B3 + B3' + B3") (+ C2 + C2 '+ C2 ") (+ D + D' + D") Ü5 A5 + A5 ' Ü6 A6 + A6 " Ü7 A7 "(+ B5")
  • the reflectors for the nearer zones in parentheses in Table 1 indicate that these reflectors can be included in the evaluation, but under Loss of radial resolution. You could also use the remaining reflectors of the closer ones Align zones in the same way as those in the far zones, for example the reflectors B2 and B4 on Ü3 or Ü5 and C1 and C2 on Ü1 or Ü7. This would, as it were, from Detector M curtains curtained to the reception areas Ü1 to Ü7 and you could Detect penetration of each curtain by an intruder.
  • Each monitoring area is therefore only a specific pyro sensor or only a specific one Combination of two or three pyro sensors assigned and you can choose from Number and number of pyro-sensors exposed to heat radiation at the same time unequivocally infer the surveillance area concerned.
  • n pyrosensors 2 n -1 combination possibilities with unambiguous identification of the azimuth of an intruder ie with 3 pyrosensors 7, with 4 pyrosensors 15 combination possibilities, and so on. If for some reason the number of pyro sensors is so limited that they are not sufficient for the required combination options, then neighboring surveillance areas can be summarized.
  • each of the pyro sensors S, S 'and S "each have three mirrors R1, R2, R3; R1', R2 ', R3' and R1", R2 ", R3" respectively narrower reflectors would be assigned, the mirror with the index 1 den Angular range from 0 ° to 30 °, the angles with index 2 the angular range from 30 ° up to 60 ° and the mirrors with index 3 cover the angular range from 60 ° to 90 ° would.
  • the intruder is in the surveillance area Ü4 and can only move on from there to Ü3 or Ü5. When it moves in the direction from Ü7 to Ü1 through an angular range and on the edge of which reaches the signal "100". If the next signal is "001", then you know that the intruder has entered the next angular range. With the help of the coded sensor signals, the path of an intruder in the track the monitored space, even if the coverage pattern is on compresses a fraction of the original opening angle and accordingly often is repeated. The coded signal also provides clues about the number of possible Burglars, which is of no small interest for the police who are moving out.
  • a surveillance camera If a surveillance camera is installed in the monitored room, it can Align them based on the tracking of the burglar and even if it is tight Angle of view take a picture with good resolution, what with today's applications not possible. This application is especially for banks, museums and the like Interesting.
  • Another interesting application is the ability to switch certain ones Switch monitoring areas either active or inactive and therefore in rooms to monitor certain zones during the day with visitors. You can also in at night, when the detector is armed, certain problem areas in the monitoring room, in which, for example, fax or air conditioning units are located, switch off.
  • the multiplication of the overlap pattern has particular use of pyro arrays for intrusion detection and presence monitoring a promising one Potential because the immunity to interference is increased considerably.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)
EP99101920A 1999-01-29 1999-01-29 Détecteur passif à infrarouge Withdrawn EP1024465A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP99101920A EP1024465A1 (fr) 1999-01-29 1999-01-29 Détecteur passif à infrarouge

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP99101920A EP1024465A1 (fr) 1999-01-29 1999-01-29 Détecteur passif à infrarouge

Publications (1)

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EP1024465A1 true EP1024465A1 (fr) 2000-08-02

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EP99101920A Withdrawn EP1024465A1 (fr) 1999-01-29 1999-01-29 Détecteur passif à infrarouge

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1184824A1 (fr) * 2000-09-02 2002-03-06 Siemens Building Technologies AG Détecteur passif d'infrarouges
EP1361553A1 (fr) * 2002-05-08 2003-11-12 Infrared Integrated Systems Ltd. Système de surveillance pour la localisation d'évenements dans un espace à trois dimensions
US7355626B2 (en) 2001-04-30 2008-04-08 Infrared Integrated Systems Limited Location of events in a three dimensional space under surveillance

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0303913A1 (fr) * 1987-08-11 1989-02-22 Cerberus Ag Détecteur d'intrusion
US5296707A (en) * 1991-06-03 1994-03-22 Murata Mfg. Co., Ltd. Apparatus for detecting movement of heat source
US5641963A (en) * 1995-09-29 1997-06-24 Mueller; Thomas J. Infrared location system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0303913A1 (fr) * 1987-08-11 1989-02-22 Cerberus Ag Détecteur d'intrusion
US5296707A (en) * 1991-06-03 1994-03-22 Murata Mfg. Co., Ltd. Apparatus for detecting movement of heat source
US5641963A (en) * 1995-09-29 1997-06-24 Mueller; Thomas J. Infrared location system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1184824A1 (fr) * 2000-09-02 2002-03-06 Siemens Building Technologies AG Détecteur passif d'infrarouges
US7355626B2 (en) 2001-04-30 2008-04-08 Infrared Integrated Systems Limited Location of events in a three dimensional space under surveillance
EP1361553A1 (fr) * 2002-05-08 2003-11-12 Infrared Integrated Systems Ltd. Système de surveillance pour la localisation d'évenements dans un espace à trois dimensions

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