WO2001067414A1 - Detecteur a infrarouge passif distinguant les animaux familiers - Google Patents

Detecteur a infrarouge passif distinguant les animaux familiers Download PDF

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Publication number
WO2001067414A1
WO2001067414A1 PCT/CA2001/000284 CA0100284W WO0167414A1 WO 2001067414 A1 WO2001067414 A1 WO 2001067414A1 CA 0100284 W CA0100284 W CA 0100284W WO 0167414 A1 WO0167414 A1 WO 0167414A1
Authority
WO
WIPO (PCT)
Prior art keywords
focussing
detector
tier
passive infrared
close
Prior art date
Application number
PCT/CA2001/000284
Other languages
English (en)
Inventor
Steven Lee
Original Assignee
Digital Security Controls Ltd.
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 Digital Security Controls Ltd. filed Critical Digital Security Controls Ltd.
Priority to EP01914858A priority Critical patent/EP1264292B1/fr
Priority to BRPI0109092-5A priority patent/BRPI0109092B1/pt
Priority to DE60140432T priority patent/DE60140432D1/de
Priority to AU2001242129A priority patent/AU2001242129B2/en
Priority to AU4212901A priority patent/AU4212901A/xx
Publication of WO2001067414A1 publication Critical patent/WO2001067414A1/fr

Links

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
    • 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
    • G08B29/18—Prevention or correction of operating errors
    • G08B29/183—Single detectors using dual technologies

Definitions

  • the present application relates to passive infrared motion detection sensors and in particular, relates to a sensor which has improved features with respect to false alarms caused by small pets.
  • Passive infrared detectors focus radiation from an area to be monitored in a particular manner such that movement of a human intruder through the monitored space is detected.
  • a Fresnel focussing arrangement (lens or mirror) focuses infrared radiation emitted by a human or pet target onto a passive infrared detector.
  • the Fresnel lens has multiple lensets and each lenset includes a focussing element defining an infrared beam that collectively covers the protected area . These beams increase in size as an increasing function of proportional to the distance from the detector.
  • This characteristic of the Fresnel lens makes it difficult to distinguish between small pets located in a region close to the detector from a human target located at a substantial distance from the detector. In the closer region to the detector, the beams are quite small, and as such, a small pet will produce a signal similar in level to a person a substantial distance away from the detector.
  • a passive infrared motion sensor comprises a passive infrared detector, a Fresnel focussing arrangement in front of the detector for selective focussing of infrared radiation from an area to be monitored, and directing such radiation onto the detector and processing such circuitry for analyzing the signal from the detector and making a determination whether an intruder is present.
  • the Fresnel focussing arrangement is divided into at least two tiers comprising a first tier and a second tier.
  • the first tier focusses radiation from a distant subdivision of the area being monitored and the second tier focusses radiation from a close subdivision of the area being monitored.
  • the second tier divides the close subdivision into narrow elongated vertically disposed sensing strips such that a pet in the close subdivision causes the detector to produce a signal less than 80% of the signal used to indicate the presence of an intruder in the close subdivision or the distant subdivision.
  • the Fresnel focussing arrangement can either be a mirror arrangement or a lens arrangement.
  • a Fresnel lens is used, comprising a number of stacked lensets of a Fresnel lens with the result being an elongation of the area which is capable of receiving radiation focussing the same on the detector.
  • the lensets stacked one on top of the other provides a series of vertical focal points in contrast to the prior practice of a single focal point.
  • a passive infrared motion sensor comprises a passive infrared detector, a Fresnel lens focussing arrangement in front of the detector for segmented focussing of infrared radiation from an area to be monitored onto the detector and processing circuitry for analyzing the detector, and making a determination whether an intruder is present.
  • the Fresnel focussing arrangement is divided into at least three horizontal tiers comprising an upper distant tier, an intermediate tier and a close tier, with each tier having a series of horizontally spaced focussing facets.
  • Each focussing facet of the close and the intermediate tiers are segmented to vertically elongate and shape a detection region of the facet such that the passive infrared radiation received due to a small pet in the detection region is easily distinguished from passive infrared radiation received due to an intruder in the detection region.
  • Figure 1 is a schematic of the passive infrared motion sensor
  • Figure 2 is a schematic showing the sensing conditions of a conventional passive infrared sensor
  • Figure 3 is a schematic illustrating vertical elongation of the sensing regions being used within a close and intermediate zone;
  • Figure 4 shows a Fresnel lens arrangement divided into a series of zones and showing the location of the various focal points ;
  • Figure 5 shows a Fresnel lens similar to the lens of Figure 4, however, showing the actual shape of the lens
  • Figure 6 illustrates the formation of a segmented facet portions of a Fresnel lens are produced
  • Figure 7 illustrates the formation of a modified facet of the Fresnel lens
  • Figure 8 shows the typical signal produced by a human target in the monitored space and by a animal target in a monitored space.
  • the passive infrared motion sensor 2 comprises a single element detector 4, a Fresnel focussing arrangement 6, and in this case a lens which focusses the infrared radiation 20 from the space being monitored 22 onto the detector.
  • the signal from the single element detector 4 is fed to the signal conditioning and amplification block 3 with the conditioned signal being provided to the microprocessor 10.
  • the microprocessor 10 determines the strength of the signal received at any point in time and based thereon, determines alarm conditions.
  • the signal that is generated by a small pet is normally significantly lower in amplitude than a human and can be screened by an appropriate algorithm.
  • the Fresnel lens arrangement which are used in prior art passive infrared motion sensors have the characteristic that the size of the active area from which radiation is focussed increases as a function of the separation distance from the detector.
  • the distant zone 44 has an active area generally indicated as 26 and this area can be sized to allow the radiation from a human to effectively be recognized by the sensor.
  • a small pet 21 in the active area 26 does not produce a signal of sufficient magnitude to indicate an alarm condition.
  • the active area 30 is smaller in size as the distance from the detector has decreased.
  • the pet does not occupy all of the active area 30 and the active area 30 will cover a large portion of a human intruder, and as such, a pet and a human can be distinguished.
  • the active area has substantially decreased as indicated by 34 and a small pet such as a cat, will be of a height of approximately H2 and effectively covers the area 34.
  • a small pet such as a cat
  • the signal produced by the pet will be of a magnitude similar to the signal produced by a human in area 26.
  • This close region of the sensor is the area where it has been very difficult to distinguish small pets from human intruders at a long distance. It could also be viewed that the pet and the human, due to the limited size of the region 34 produce a similar signal which would not be the case with respect to active area 30 or active area 26.
  • FIG. 3 shows the results of a modified Fresnel lens arrangement where the active areas of the sensor in a region close to the sensor have been vertically elongated and reduced in width.
  • the vertical elongation 50 shows a number of segments 52 which increase in size vertically. With this vertical shaping of the active zone, the lower most segment 52 again is dominated by a small pet when the pet crosses that zone, however, the magnitude of that signal has been reduced and the amount of radiation received by the detector has been reduced by the extent that the zone has been vertically elongated due to the stack of the focussing segments 52.
  • a human intruder relative to the active zone 60 will produce a signal that is very similar to an intruder passing through the active zone 50 as he approaches the detector.
  • the signal from the pet in zone 50 will be in proportion and will certainly not exceed the signal produced by a human at 60.
  • This vertical elongation of the active zones close to the sensor is particularly advantageous as the single element detector 4 can be used and a small pet easily distinguished.
  • the Fresnel lens arrangement has been divided into four divisions, namely; tier 1 - 60, tier 2 - 62, tier 3 - 64 and the upper region 66.
  • Upper region 66 is a typical Fresnel lens arrangement for monitoring a distant region from the detector .
  • Tiers 1 , 2 and 3 are for the area closer to the sensor.
  • Tier 1 shows the vertical stacked focal points 67 of each lens sublet and in this case, five stacks of focal points 67 are shown.
  • the second tier - 62 again has a modified series of lensets having focal points 69 which are again vertically stacked. These focal points 69 are offset relative to the focal points 67 and cooperate with tier 1 to define the close region. They require a second tier due to the different structures of tier 1 and 2 which will be explained with reference to Figures 6 through 8.
  • Tier 3 also has a series of stacked focal points 71 and these are used for the intermediate region.
  • the region 66 is for the distant region and is of a conventional design.
  • Figure 5 shows a Fresnel lens arrangement divided into regions 61, 63 and 65.
  • Region 61 is produced by slicing of a Fresnel lens facet as shown in Figure 7.
  • the facet B of Figure 7 is essentially vertically sliced as shown in the intermediate drawing. It is then vertically displaced as shown by fact B" of Figure 7.
  • This approach vertically elongates the active zone and thus shapes the reactive zone in the desired manner to increase the vertical sensitivity and reduce the signal that a small pet will produce if it crosses this active zone.
  • Tier 63 of Figure 5 is produced in the manner shown in Figure 6. A central portion of facet A of Figure 6 is removed and similar facets are stacked one above the other to produce the facet A' of Figure 6. This is the general structure of the various segments 63. If the portions are small enough, the resulting stack can approach the barrel type lens of Figure 6. It can also be seen in Figure 5 that the segment 63 has four such stacked segments one above the other and there are different portions horizontally across the Fresnel lens.
  • the active area close to the sensor has been vertically elongated and is relatively narrow.
  • the signal produced by a small pet is greatly reduced and thus the sensitivity to small pets is greatly reduced.
  • the vertical elongation assures that the taller human intruder will be sensed, therefore, the vertical elongation in the close zone allows decreasing of the signal caused by a small pet, and allows this reduced signal to be distinguished from an intruder at a substantial distance from the sensor.
  • a single element detector can be used and the same algorithm is used by the microprocessor to distinguish between humans and small pets easily distinguishes pets. If a cat happens to climb up onto a couch and moves along the back of the couch in close proximity to the sensor, the small pet will still not occupy all of the segmented active zone due to the substantial vertical elongation and as such, the resulting signal is less than that used to distinguish an intruder.
  • the focussing arrangement vertical elongates the responsive area. This vertical elongation can be achieved through appropriate lens design or mirror design.
  • the Fresnel lens is one convenient approach to achieve this result.
  • a mirror for focussing of the infrared radiation is a cost effective alternative.
  • the mirror can be segmented or of a continuous design to achieve the desired vertical elongation to allow a small pet and a human intruder to be distinguished.
  • Some PIR motion detectors utilize mirror optics to focus the infrared energy from the protected area. Normally, the mirror focussing arrangement has better efficiency in focussing compared to the Fresnel lens .
  • a curved mirror acts as a concentrator of energy and also creates beam patterns similar to a Fresnel lens.
  • a given mirror surface can be segmented and each segment rotated by small increments to elongate the beam pattern.
  • Another way of achieving a similar result is to modify the curvature of the mirror to widen the beam pattern. The reflection of incident infrared ray is dependent on the angle of incidence.
  • the curvature of the mirror can be designed to create desirable beam width and length at given distances from the detector.
  • This elongation or shaping technique is also able to distinguish two pets in close proximity to the sensor.
  • the signal produced by a small pet such as a cat is less than about 40% of two cats in close proximity to the sensor will only produce a signal at about 80% of the magnitude necessary to indicate an intruder.
  • the signal 100 of Figure 8 shows the response 102 due to a human intruder in the close zone and response 104 due to a cat in the close zone.
  • the vertical elongation of the active zones has reduced the signal produced by a small pet.

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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)

Abstract

Un détecteur à infrarouge passif utilise une lentille ou un miroir modifié pour allonger verticalement les zones de détection dans des régions proches du détecteur. Cet allongement vertical réduit le signal produit par un petit animal familier, tel qu'un chat, tandis que la hauteur supérieure d'un intrus humain produit un signal plus grand. Le détecteur utilise avantageusement un seul détecteur et le même algorithme est utilisé pour distinguer les intrus humains des petits animaux familiers.
PCT/CA2001/000284 2000-03-10 2001-03-08 Detecteur a infrarouge passif distinguant les animaux familiers WO2001067414A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP01914858A EP1264292B1 (fr) 2000-03-10 2001-03-08 Detecteur a infrarouge passif distinguant les animaux familiers
BRPI0109092-5A BRPI0109092B1 (pt) 2000-03-10 2001-03-08 Sensor de movimento a infravermelho passivo
DE60140432T DE60140432D1 (de) 2000-03-10 2001-03-08 Pir-detektor mit verbesserter falschen alarmmeldung von haustieren
AU2001242129A AU2001242129B2 (en) 2000-03-10 2001-03-08 Pet resistant pir detector
AU4212901A AU4212901A (en) 2000-03-10 2001-03-08 Pet resistant pir detector

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA 2300644 CA2300644C (fr) 2000-03-10 2000-03-10 Detecteur de mouvement passif a infrarouge a l'epreuve des animaux de compagnie
CA2,300,644 2000-03-10

Publications (1)

Publication Number Publication Date
WO2001067414A1 true WO2001067414A1 (fr) 2001-09-13

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CA2001/000284 WO2001067414A1 (fr) 2000-03-10 2001-03-08 Detecteur a infrarouge passif distinguant les animaux familiers

Country Status (6)

Country Link
EP (1) EP1264292B1 (fr)
AU (2) AU2001242129B2 (fr)
BR (1) BRPI0109092B1 (fr)
CA (1) CA2300644C (fr)
DE (1) DE60140432D1 (fr)
WO (1) WO2001067414A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2402532A (en) * 2004-04-15 2004-12-08 Mark Anthony Wheatley Alarm sensor cover
CN102279426A (zh) * 2011-05-25 2011-12-14 深圳市豪恩安全科技有限公司 一种菲涅尔透镜、被动红外探测器及安防系统
US8542118B2 (en) 2010-05-27 2013-09-24 Nxp B.V. Presence detection system and method
US9733127B2 (en) 2016-01-19 2017-08-15 Google Inc. System and method for estimating size and location of moving objects
US9797769B2 (en) 2012-11-13 2017-10-24 Pyronix Limited Infrared detection device and masking section
EP3373262A1 (fr) * 2017-03-08 2018-09-12 Tyco Fire & Security GmbH Système de détection de mouvement humain
EP3379507A1 (fr) * 2017-03-23 2018-09-26 eQ-3 Holding GmbH Dispositif et procédé de détection de directions dans des passages
EP3090416B1 (fr) * 2014-01-03 2020-05-27 MariCare Oy Procede et systeme de surveillance

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL2012327B1 (en) 2013-12-13 2016-06-21 Utc Fire & Security B V Selective intrusion detection systems.
EP3171346A3 (fr) 2015-11-23 2017-08-09 Essence Security International Ltd. Dispositif de détection de sécurité réglable
CA3055266A1 (fr) * 2017-03-06 2018-09-13 Tyco Fire & Security Gmbh Detecteur d'intrusion infrarouge passif

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0209385A2 (fr) 1985-07-17 1987-01-21 Racal-Guardall (Scotland) Limited Détecteurs passifs infrarouges
EP0218055A1 (fr) * 1985-09-02 1987-04-15 Heimann GmbH Détecteur de mouvement à infrarouge
US4849635A (en) 1986-01-24 1989-07-18 Optex Co., Ltd. Intruder perceiving apparatus by means of infrared detection
EP0361224A1 (fr) 1988-09-22 1990-04-04 Cerberus Ag Détecteur d'intrusion à infrarouge
EP0501253A1 (fr) * 1991-03-01 1992-09-02 Cerberus Ag Dispositif pour la détection d'incendies dans un espace étendu, en particulier d'incendies de forêts

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0209385A2 (fr) 1985-07-17 1987-01-21 Racal-Guardall (Scotland) Limited Détecteurs passifs infrarouges
EP0218055A1 (fr) * 1985-09-02 1987-04-15 Heimann GmbH Détecteur de mouvement à infrarouge
US4849635A (en) 1986-01-24 1989-07-18 Optex Co., Ltd. Intruder perceiving apparatus by means of infrared detection
EP0361224A1 (fr) 1988-09-22 1990-04-04 Cerberus Ag Détecteur d'intrusion à infrarouge
EP0501253A1 (fr) * 1991-03-01 1992-09-02 Cerberus Ag Dispositif pour la détection d'incendies dans un espace étendu, en particulier d'incendies de forêts

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2402532A (en) * 2004-04-15 2004-12-08 Mark Anthony Wheatley Alarm sensor cover
GB2402532B (en) * 2004-04-15 2005-06-01 Mark Anthony Wheatley Sensor cover
US8542118B2 (en) 2010-05-27 2013-09-24 Nxp B.V. Presence detection system and method
CN102279426A (zh) * 2011-05-25 2011-12-14 深圳市豪恩安全科技有限公司 一种菲涅尔透镜、被动红外探测器及安防系统
US9797769B2 (en) 2012-11-13 2017-10-24 Pyronix Limited Infrared detection device and masking section
EP3090416B1 (fr) * 2014-01-03 2020-05-27 MariCare Oy Procede et systeme de surveillance
US9733127B2 (en) 2016-01-19 2017-08-15 Google Inc. System and method for estimating size and location of moving objects
EP3373262A1 (fr) * 2017-03-08 2018-09-12 Tyco Fire & Security GmbH Système de détection de mouvement humain
EP3379507A1 (fr) * 2017-03-23 2018-09-26 eQ-3 Holding GmbH Dispositif et procédé de détection de directions dans des passages

Also Published As

Publication number Publication date
BRPI0109092B1 (pt) 2015-09-01
EP1264292B1 (fr) 2009-11-11
EP1264292A1 (fr) 2002-12-11
AU4212901A (en) 2001-09-17
CA2300644C (fr) 2009-07-14
CA2300644A1 (fr) 2001-09-10
AU2001242129B2 (en) 2005-01-20
DE60140432D1 (de) 2009-12-24
BR0109092A (pt) 2003-06-03

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