EP1089244B1 - Disposition de miroirs dans un capteur passif d'infrarouge - Google Patents

Disposition de miroirs dans un capteur passif d'infrarouge Download PDF

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Publication number
EP1089244B1
EP1089244B1 EP20000111473 EP00111473A EP1089244B1 EP 1089244 B1 EP1089244 B1 EP 1089244B1 EP 20000111473 EP20000111473 EP 20000111473 EP 00111473 A EP00111473 A EP 00111473A EP 1089244 B1 EP1089244 B1 EP 1089244B1
Authority
EP
European Patent Office
Prior art keywords
mirror arrangement
reflector
surveillance
zones
arrangement according
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
EP20000111473
Other languages
German (de)
English (en)
Other versions
EP1089244A1 (fr
Inventor
Kurt Dr. Müller
René Lange
Martin Dr. Allemann
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 claimed from EP99119496A external-priority patent/EP1089245B1/fr
Application filed by Siemens Building Technologies AG filed Critical Siemens Building Technologies AG
Priority to EP20000111473 priority Critical patent/EP1089244B1/fr
Publication of EP1089244A1 publication Critical patent/EP1089244A1/fr
Application granted granted Critical
Publication of EP1089244B1 publication Critical patent/EP1089244B1/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
    • 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 mirror arrangement for passive infrared detectors for monitoring elongated rooms, with a plurality of reflectors for focusing the heat rays falling on the detector from a monitoring room onto a sensor arranged in the detector, each reflector having a monitoring area at a specific radial distance from the mirror arrangement and is assigned by the detector and the monitoring areas cover the monitoring area in a vertical direction.
  • Such passive infrared detectors for monitoring elongated rooms which are also referred to as curtain detectors, are used in particular to determine the presence or intrusion of unauthorized persons into the monitoring room by detecting the typical infrared radiation emitted by these persons, which is directed onto the sensor by the mirror arrangement (See, for example, EP-A-0 361 224).
  • the reflectors are usually arranged in horizontally and / or vertically staggered rows, and depending on the distance from the detector, different monitoring zones are distinguished, e.g. Femzone, middle zone, near zone and look-down zone, each of which has at least one surveillance area. Each reflector thus defines a monitoring area with a defined position in the monitoring room. As soon as an object emitting heat radiation enters a monitoring area, the sensor detects the heat radiation emitted by this object.
  • a total of 11 reflectors are provided which are offset not only from one another in the horizontal and vertical directions but also in depth, which leads to a graduated design of the reflecting surface of the mirror arrangement.
  • the individual reflectors are sometimes very small, strip-shaped segments that can hardly be touched by hand, which are cut out of a paraboloid, for example.
  • the mirror arrangement is produced using the injection molding process, the injection molding tool for each reflector having a "tooth" of the width and length of the respective segment and with a curved end face corresponding to the reflecting surface of the segment.
  • the individual teeth are then assembled in such a way that their end faces form the counterpart to the reflecting surface of the mirror arrangement, with gradations being formed between the individual reflectors and accordingly also between the associated teeth are.
  • its maintenance is also relatively complex and expensive, because corrosion develops over time between the individual teeth, which necessitates regular maintenance. During this maintenance, the injection molding tool must be disassembled and cleaned and then reassembled.
  • the invention is now to provide a detection-safe mirror arrangement of the type mentioned at the outset, the production and maintenance costs of which are significantly reduced compared to the mirror arrangements used today.
  • each reflector consists of a number of segments, so that the monitoring areas are split vertically into subzones with slightly different elevations, the elevation of the sub-elements being selected such that the majority of the monitoring areas have at most a slight overlap of the subzones, the subzones are stacked on top of each other and the layering is selected so that a tight curtain is created and that the individual segments of each reflector each form a continuous, coherent surface.
  • the design of the reflectors as continuous, coherent surfaces has the advantage that each injection molding tool provided for a reflector can be manufactured from one piece and no longer has to be assembled from individual teeth. If one assumes that a femzone, a middle zone, a near zone and a look-down zone and accordingly four reflectors are provided, then there is a reduction compared to the mirror arrangement with 11 reflectors described in EP-A-0 361 224 two thirds, but which is at the same time due to the splitting of the reflectors into partial elements by at least the same number of monitoring areas as before.
  • Passive infrared detectors of the current generation can reliably detect intruders within the effective range of the detector, but they are generally not able to distinguish people from larger pets, such as dogs, and also give an alarm if an animal penetrates . If today's passive infrared detectors already have a pet immunity, this is achieved with a few exceptions by reducing the sensitivity of the detector accordingly, which means an undesirable reduction in detection reliability.
  • a passive infrared detector is described in US Pat. No. 4,849,635, in which a Fresnel lens arrangement is used instead of the mirror arrangement for focusing the heat radiation onto the sensor.
  • pet immunity is achieved in that the lens arrangement has a plurality of differently oriented, non-overlapping visual fields or monitoring areas, which run from the lens arrangement in a fan shape into the monitoring room. These monitoring areas are staggered vertically, with gaps of approximately the same size being formed between the individual areas.
  • An intruder with a certain minimum size will always cross at least one surveillance area and thus always generate a sensor signal, and an intruder below this minimum size will alternately cross surveillance areas and only gaps and in the latter case will not generate a sensor signal.
  • a human being will generate a steady sensor signal with an approximately constant amplitude when moving in the surveillance space, whereas an animal will trigger a pulse-shaped signal of substantially lower maximum amplitude.
  • the solution according to the invention has the advantage that a pet, however large, as long as its height is smaller than that of a human being, is always distinguished with certainty from a human being. Because an upright person will always cross several subzones of the fem and middle zone, or middle and near zone, etc. and thereby trigger a sensor signal that is several times larger than an animal of lower height. Because this will cross significantly fewer subzones and generate a significantly reduced sensor signal. A dog of normal size will cross a sub-zone or at most two, but only partially, and will thereby trigger a signal reduced by half or one third compared to the detector described in EP-A-0 361 224.
  • a first preferred embodiment of the mirror arrangement according to the invention is characterized in that the sensitivity to a pet is approximately the same in the individual subzones. This is achieved by avoiding the overlap of the individual subzones.
  • a second preferred embodiment of the mirror arrangement according to the invention is characterized in that the weighting of the individual segments, in particular their optical aperture and / or area is selected such that an animal of a selectable size that moves transversely to the coverage pattern formed by the surveillance areas delivers an approximately equally small signal from a certain distance from the detector.
  • a third preferred embodiment of the mirror arrangement according to the invention is characterized in that the reflectors associated with a small radial distance of the monitoring zones from the detector are brighter than those for monitoring zones further away from the detector.
  • a fourth preferred embodiment is characterized in that a first reflector for a far zone, a second reflector for a central zone, a third reflector for a near zone and a fourth reflector for a look-down zone is provided, and that the third and fourth Reflector are more powerful.
  • the mirror arrangement 1 shown in FIG. 1 is a further development of the mirror described in EP-A-0 361 224, by means of which the mirror is improved in such a way that it is immune to pets in its effective range on the one hand, and it is more cost-effective to manufacture and maintain.
  • a Fresnel lens arrangement can also be used, in which the individual Fresnel lenses are correspondingly divided into partial lenses, so that the monitoring areas would also be split vertically into subzones.
  • the mirror arrangement 1 consists of a number of reflectors which are designed in such a way that the monitoring areas assigned to the individual reflectors verticalize the monitoring space Cover direction.
  • the reflectors are arranged in rows, several monitoring zones being provided according to the distance from the detector. A distinction is made between four surveillance zones, a far zone, a middle zone, a near zone and a so-called look-down zone, which are covered by four reflectors or rows of reflectors offset in the vertical direction.
  • these reflectors are the reflector A for the far zone, the reflector B for the middle zone, the reflector C for the near zone and the reflector D for the look-down zone.
  • Each reflector "looks" into the monitoring room at a certain elevation angle, receives the heat radiation incident from this angle and bundles it on the heat-sensitive sensor, which is formed, for example, by a pyro sensor.
  • This is preferably a so-called standard dual pyrosensor, as used, for example, in the passive infrared detectors of Siemens Building Technologies AG, Cerberus Division, formerly Cerberus AG (see also EP-A-0 303 913).
  • the sensor detects the heat radiation emitted by this object, whereupon the detector emits an alarm signal.
  • This alarm signal indicates that an object, such as an intruder, is in the surveillance room.
  • the reflector A for the far zone consists of five segments A 1 to A 5
  • the reflector B for the middle zone consists of three segments B 1 to B 3
  • the reflector C for the near zone consists of four segments C 1 to C 4 and the reflector D for the look-down zone from two segments D 1 and D 2 , wherein the segments of each reflector together form a continuous, coherent surface.
  • the mirror arrangement 1 thus consists of a total of 14 segments which are distributed over four continuous, coherent surfaces. This means that the surveillance areas assigned to the four zones, femzone, middle zone, near zone and look-down zone are divided into subzones with slightly different elevation, the subzones representing surveillance areas.
  • each reflector A, B, C, D forms a continuous, coherent surface
  • the injection molding tool required for its production can be manufactured in one piece. In practice, this injection molding tool is milled from a single workpiece.
  • the end result is 14 subzones, that is 14 monitoring areas.
  • the individual segments and subzones are weighted, i.e. their optical aperture and / or their area are selected such that a dog moving transversely to the covering pattern (FIG. 3) generates a signal which is the same for a distance from the dog to the detector from approximately 5 meters.
  • the reflectors C and D for the close-up and look-down zones are relatively bright to prevent a fast-moving intruder from going underneath a relatively high-mounted detector (mounting height> 3m). In the case of a high-mounted detector, this intruder would cross only a few subzones, possibly only one, and thus only generate a relatively small signal, which is compensated for by the increased light intensity.
  • a detector with bright reflectors C and D for the near and the look-down zone is absolutely detection-safe for people at an installation height between about 1.6 and 4 meters.
  • FIG. 3 shows the coverage pattern of the mirror arrangement 1 (FIG. 1) in a vertical section in its elevation plane, the course of the heat radiation from the individual subzones in the monitoring room to the mirror arrangement 1 being shown.
  • the subzones are identified by reference numerals A ' 1 to A' 5 for the femzone, B 'to B' 3 , for the central zone, C ' 1 to C' 4 for the near zone and D ' 1 and D' 2 for the look -down zone.
  • the subzones are stacked on top of each other. They touch each other, but overlap at most very little so that no areas of greater sensitivity arise.
  • the mirror arrangement 1 is at a height of 2.2 m above the floor: the two horizontal lines H and M correspond to a height of 0.6 and 1.8 m, respectively, and thus symbolize the movement of a dog or a person in the surveillance room.
  • a dog crosses only one sub-zone fully or two sub-zones partially in the effective range of the detector.
  • an upright intruder always crosses several sub-zones from the far and middle zone or middle and near zone or near and look-down zone and thereby generates a signal that is several times larger than that of the dog.
  • each pair of sensor elements forms a channel, the two channels effectively corresponding to a vertical splitting of the monitoring areas.
  • the lower one "looks" into the ground at a distance of about 20 m from the detector, so that the range is limited when a signal is requested in both channels for an alarm.
  • even a large dog will never be able to deliver a signal above the detection threshold in the upper channel, so that even large dogs outside the detector's effective range cannot trigger a false alarm.
  • a cheaper, but less effective variant compared to the Quadpyrosensor would be to use Longflake-Pyros.
  • the image of a medium-sized dog covers significantly more than 50% of the height of the flakes (sensor elements), and the image of an upright person protrudes far beyond the height of the flakes, with the part protruding beyond the flakes contributing nothing to the sensor signal , For example, if you doubled the amount of flakes, the difference between the signals triggered by a dog and a human would be much larger, which would improve the distinguishability.
  • the gain factor magnification of a human signal
  • compared to a dual sensor would be about 1.4, for a quad sensor it would be 2.5 to 3.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)

Claims (9)

  1. Dispositif de miroirs pour un détecteur infrarouge passif de surveillance d'espaces s'étendant en longueur comprenant plusieurs réflecteurs (A à D) pour focaliser le rayonnement calorifique allant de l'espace à surveiller sur le détecteur sur un capteur disposé dans le détecteur, une partie à surveiller, à un éloignement radial déterminé du dispositif (1) de miroirs et ainsi du détecteur, étant associée à chaque réflecteur (A à D) et les parties à surveiller recouvrant en direction verticale l'espace à surveiller, caractérisé en ce que chaque réflecteur (A à D) est constitué d'un certain nombre de segments (A1 à A5, B1 à B3, C1 à C4, D1, D2), de sorte que les parties à surveiller sont subdivisées verticalement en sous-zones (A'1 à A'5, B'1 à B'3, C'1 à C'4, D'1, D'2) ayant une élévation légèrement différente, l'élévation des segments (A1 à A5, B1 à B3, C1 à C4, D1, D2) étant choisie de façon à ce qu'il se produise, pour la multiplicité des parties à surveiller, au plus un léger chevauchement des sous-zones (A'1 à A'5, B'1 à B'3, C'1 à C'4, D'1, D'2), en ce que les sous-zones (A'1 à A'5, B'1 à B'3, C'1 à C'4, D'1, D'2) sont empilées les unes sur les autres et l'empilement est choisi de façon à créer un rideau dense, et en ce que les segments (A1 à A5, B1 à B3, C1 à C4, D1, D2) individuels de chaque réflecteur (A, B, C, D) forment, respectivement, une surface ininterrompue d'un seul tenant.
  2. Dispositif de miroirs suivant la revendication 1, caractérisé en ce que la sensibilité à un animal domestique dans les diverses sous-zones (A'1 à A'5, B'1 à B'3, C'1 à C'4, D'1, D'2) est à peu près la même.
  3. Dispositif de miroirs suivant la revendication 2, caractérisé en ce que la pondération des divers segments (A1 à A5, B1 à B3, C1 à C4, D1, D2), notamment leur ouverture optique et/ou leur surface, est choisie de façon à ce qu'un animal d'une taille déterminée se déplaçant transversalement au modèle de recouvrement formé par les parties à surveiller fournissent, à partir d'une certaine distance du détecteur, un petit signal à peu près égal.
  4. Dispositif de miroirs suivant l'une des revendications 1 à 3, caractérisé en ce que les réflecteurs (C, D) associés à une petite distance radiale des zones à surveiller au détecteur sont d'une luminosité plus intense que ceux pour les zones à surveiller plus éloignées du détecteur.
  5. Dispositif de miroirs suivant la revendication 4, caractérisé en ce qu'il est prévu un premier réflecteur (A) pour une zone lointaine, un deuxième réflecteur (B) pour une zone moyenne, un troisième réflecteur (C) pour une zone proche et un quatrième réflecteur (D) pour une zone de look-down et en ce que le troisième et le quatrième réflecteurs (C et D) sont d'une grande intensité lumineuse.
  6. Dispositif de miroirs suivant la revendication 4 ou 5, caractérisé par un diaphragme qui peut être placé sur le dispositif (1) de miroirs et qui est destiné à recouvrir en partie les réflecteurs (C, D) de plus grande intensité lumineuse.
  7. Dispositif de miroirs suivant la revendication 6, caractérisé en ce que le diaphragme est formé d'une pièce (2) rapportée élastique en matière plastique.
  8. Dispositif de miroirs suivant la revendication 7, caractérisé en ce que la dimension de la pièce (2) rapportée en matière plastique est adaptée au poids d'un animal qui, lorsqu'il entre dans les zones associées aux réflecteurs (B, C, D) recouverts partiellement, ne doit pas déclencher d'alerte.
  9. Dispositif de miroirs suivant la revendication 8, caractérisé en ce qu'il est prévu plusieurs inserts (2) en matière plastique pouvant être utilisés à volonté dans le dispositif (1) de miroirs et adaptés à des animaux de poids différents.
EP20000111473 1999-10-01 2000-05-29 Disposition de miroirs dans un capteur passif d'infrarouge Expired - Lifetime EP1089244B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20000111473 EP1089244B1 (fr) 1999-10-01 2000-05-29 Disposition de miroirs dans un capteur passif d'infrarouge

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP99119496 1999-10-01
EP99119496A EP1089245B1 (fr) 1999-10-01 1999-10-01 Détecteur infrarouge passif
EP20000111473 EP1089244B1 (fr) 1999-10-01 2000-05-29 Disposition de miroirs dans un capteur passif d'infrarouge

Publications (2)

Publication Number Publication Date
EP1089244A1 EP1089244A1 (fr) 2001-04-04
EP1089244B1 true EP1089244B1 (fr) 2004-03-31

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EP20000111473 Expired - Lifetime EP1089244B1 (fr) 1999-10-01 2000-05-29 Disposition de miroirs dans un capteur passif d'infrarouge

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Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3112529C2 (de) * 1981-03-30 1985-05-23 Fritz Fuss Kg, 7470 Albstadt Spiegelanordnung für eine Meldeeinrichtung
CH676642A5 (fr) * 1988-09-22 1991-02-15 Cerberus Ag
GB2251700B (en) * 1990-11-30 1994-08-24 Combined Optical Ind Ltd Multiple array lens
CA2196014C (fr) * 1997-01-27 2001-05-08 Reinhart Karl Pildner Detecteur de mouvement passif a infrarouge a deux elements permettant la discrimination de tailles

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Publication number Publication date
EP1089244A1 (fr) 2001-04-04

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