EP0050751B1 - Arrangement optique pour un détecteur d'intrusion à infrarouge - Google Patents

Arrangement optique pour un détecteur d'intrusion à infrarouge Download PDF

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Publication number
EP0050751B1
EP0050751B1 EP81107844A EP81107844A EP0050751B1 EP 0050751 B1 EP0050751 B1 EP 0050751B1 EP 81107844 A EP81107844 A EP 81107844A EP 81107844 A EP81107844 A EP 81107844A EP 0050751 B1 EP0050751 B1 EP 0050751B1
Authority
EP
European Patent Office
Prior art keywords
radiation
optical arrangement
reflectors
infrared
intrusion detector
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
Application number
EP81107844A
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German (de)
English (en)
Other versions
EP0050751A1 (fr
Inventor
Peter Wägli
Alois Zetting
Gustav Pfister
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.)
Cerberus AG
Original Assignee
Cerberus 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 Cerberus AG filed Critical Cerberus AG
Priority to AT81107844T priority Critical patent/ATE24786T1/de
Publication of EP0050751A1 publication Critical patent/EP0050751A1/fr
Application granted granted Critical
Publication of EP0050751B1 publication Critical patent/EP0050751B1/fr
Expired legal-status Critical Current

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    • 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
    • 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 optical arrangement for an infrared intrusion detector.
  • Such arrangements pick up the infrared radiation emanating from a person in the monitored area and direct it to a sensor element. If the monitored area is divided into several separate reception areas with dark fields in between, each movement of a person causes a modulation of the infrared radiation received by the sensor element, which can be evaluated by means of a known upgrading circuit to indicate an intruder and to give an alarm signal.
  • US-A-4 052 616 shows an arrangement with a hemispherical reflector or a Fresnel lens for all reception areas and light guides which give the infrared radiation to a sensor.
  • the number of light guides is limited by the size of the sensor surface, so that the amount of radiation incident on the sensor is insufficient. Furthermore, the attachment of the ends of the light guides on the focal surface and on the sensor surface is difficult.
  • US-A-3 702 937 describes a motion detector which, instead of reflectors, uses a lens arrangement which divides the image of the monitored area into two parts and places them on two photocells which are integrated in a bridge circuit. If the monitored area is illuminated differently, the electrical bridge circuit is imbalanced and an alarm is generated. The amount of radiation reaching a photocell is low.
  • the object of the invention is to eliminate the essential disadvantage of the prior art, which, despite the different lens and reflector arrangement, is the low absorption of the radiation amount, in order to increase the sensitivity of the intrusion detector.
  • the intrusion detector should have small spatial dimensions so that it can be attached inconspicuously at its place of use.
  • Another purpose of the invention is the simple construction of the optical arrangement.
  • a collecting lens 1 is provided as the first focusing means, which is designed as a Fresnel lens.
  • Such stepped lenses can be easily produced from a suitable transparent material by pressing or casting. It is particularly expedient to choose a material, for example a suitable plastic material which is preferably transparent in the region of long-wave infrared radiation, for example polyethylene, or As 2 S 3 , Se, or As / Se glasses, these glasses also can be evaporated as a filter on the polyethylene lens.
  • a material for example a suitable plastic material which is preferably transparent in the region of long-wave infrared radiation, for example polyethylene, or As 2 S 3 , Se, or As / Se glasses, these glasses also can be evaporated as a filter on the polyethylene lens.
  • a plurality of individual reflectors 2, 3,... 6 are arranged behind this Fresnel lens in the direction of irradiation. These reflectors can be concave or convex spherical, paraboloid or ellipsoid segments or be designed as a plane mirror inclined to one another.
  • a detector element 7 is provided in the center of the Fresnel lens 1, the sensitivity of which is matched to the infrared radiation to be received, for example lithium tantalate (LiTaO a ).
  • the focal length of the Fresnel lens 1, the curvature, the alignment and the spacing of the reflectors 2, 3,... 6 can be chosen so that the infrared radiation arriving from certain desired directions is imaged as well as possible.
  • the individual reception areas become reception directions with a relatively small opening angle, which depends on the accuracy of the optical components and their adjustment, as well as on the dimensions of the sensor element. If a different shape of reception areas is desired, for example a rectangular or strip shape, the reflectors can be aspherical.
  • incident infrared radiation from the first focusing means i.e. is recorded by the Fresnel lens 1 with its full area and is only then fed to the individual mirror segments assigned to the different reception areas.
  • Each mirror segment 2, 3,... 6 receives radiation from the full surface of the Fresnel lens 1 and then bundles this radiation onto the sensor element 7.
  • the sensitivity of an infrared intrusion detector equipped with such an arrangement is therefore considerably increased.
  • the dimensions of the reflectors do not play a decisive role, so that small device dimensions are possible even with a large number of reception areas.
  • Figure 2 shows a similar arrangement, which differs from the first embodiment in that the sensor element 7 peripherally, i. H. is arranged on the edge of the Fresnel lens 1.
  • the entire opening of the Fresnel lens is thus available for receiving infrared radiation and there are no losses through the sensor element.
  • FIG. 3 shows an infrared intrusion detector with a housing 10 which has a front plate 11 and a rear side 12.
  • the front plate 11 carries a Fresnel lens 1 and below this a sensor element 7 on the edge, which is connected to an integrated evaluation circuit 8, which can be designed, for example, in accordance with US Pat. No. 4,179,691 or US Pat. No. 4,166,955.
  • the output signal of this evaluation circuit 8 is taken from the output terminals 9.
  • the rear side 12 carries a facet mirror 13, the individual facets of which correspond to the reflector 2, 3,... 6.
  • the formation and alignment of the individual facets is such that, in cooperation with the Fresnel lens 1, a bundle of many reception directions or areas with a small opening angle is created.
  • a plurality of sensor elements (7, 7 ', 7 ") arranged next to one another can be provided.
  • Each element receives radiation from a plurality of reception areas.
  • the number of possible reception areas can thus be multiplied according to the number of sensor elements , with no significant loss in intensity or sensitivity, since each sensor element receives a large part of the radiation from the common bundling means.
  • the individual reception areas are each split into a bundle of several reception areas lying on one level, making it easy to create a number of radiation curtains to be passed by an intruder.
  • FIG. 4 shows a particularly flat embodiment of an infrared intrusion detector, in which the entire front side 11 is occupied by a segment of a Fresnel lens 1, in the center of which the sensor element 7 is attached. Individual reflectors 2, 3,... 6 are provided in a row on the rear side 12.
  • the evaluation circuit 8 is attached to the base plate 14. With this arrangement, a fan of reception areas lying on one level or a protective curtain can be formed. Thanks to its flat design, the detector can be arranged inconspicuously in a narrow gap, the front surface 11 being optimally used for receiving infrared radiation from the reception areas.
  • one or more prisms can be provided in front of or behind parts of the converging lens 1, through which the individual reception beams can each be split into a plurality of beams.
  • the number of radiation receiving areas can be multiplied if a certain intensity weakening of the individual areas can be accepted.
  • prisms 15, 15 ' can be arranged in front of both sides of the Fresnel lens, for example. These have the effect that the radiation impinging on the prisms is deflected by a certain angle, while the radiation impinging directly on the lens remains unaffected. Each reception area is therefore split into three separate areas.
  • the prism element can also be combined with and integrated into the converging lens in that it is designed as a multi-zone lens with zones of different optical axes.
  • the sides of the Fresnel lens 1 has on its front or back the shape of wedges 16, 16 'which replace the prisms 15, 15' and show the same optical effect.
  • Such an optical element is particularly easy to manufacture and requires no special adjustment.
  • the infrared intrusion detector shown has an optimal sensitivity and, moreover, has a particularly simple and interference-free construction. It is particularly suitable for applications where an infrared protective curtain with closely spaced reception areas is desired.

Claims (5)

1. Dispositif optique pour un détecteur d'intrusion à infrarouge, comprenant
- une lentille de Fresnel (1) pour faire converger, suivant différentes directions, un rayonnement infrarouge, tombant sur cette lentille depuis différentes zones d'un espace à surveiller, les directions de convergence étant coordonnées chacune à l'une de ces zones,
- au moins un capteur (7; 7, 7', 7") sensible au rayonnement infrarouge et
- un certain nombre d'éléments transmetteurs de rayonnement (2-6; 13), placés derrière la lentille de Fresnel, pour la transmission du rayonnement infrarouge, provenant de zones séparées préfixées de l'espace à surveiller, à un capteur coordonné, caractérisé en ce que
- les éléments transmetteurs de rayonnement sont des réflecteurs (2-6; 13) et
- chaque capteur (7; 7', 7") est un élément pyroélectrique disposé dans le plan de la lentille de Fresnel (1).
2. Dispositif selon la revendication 1, caractérisé en ce que les réflecteurs (2-6) sont réalisés sous forme de segments de miroir sphériques.
3. Dispositif selon la revendication 1, caractérisé en ce que les réflecteurs (2-6) sont réalisés sous forme de miroirs plans inclinés les uns par rapport aux autres.
4. Dispositif selon la revendication 1, caractérisé en ce que les réflecteurs sont réunis en un miroir à facettes (13).
5. Dispositif selon la revendication 1, caractérisé en ce que les réflecteurs (2-6) sont placés les uns à côté des autres en une rangée.
EP81107844A 1980-10-24 1981-10-02 Arrangement optique pour un détecteur d'intrusion à infrarouge Expired EP0050751B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81107844T ATE24786T1 (de) 1980-10-24 1981-10-02 Optische anordnung fuer einen infraroteinbruchdetektor.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH7925/80 1980-10-24
CH7925/80A CH650604A5 (de) 1980-10-24 1980-10-24 Optische anordnung fuer einen infrarot-einbruchdetektor.

Publications (2)

Publication Number Publication Date
EP0050751A1 EP0050751A1 (fr) 1982-05-05
EP0050751B1 true EP0050751B1 (fr) 1987-01-07

Family

ID=4332472

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81107844A Expired EP0050751B1 (fr) 1980-10-24 1981-10-02 Arrangement optique pour un détecteur d'intrusion à infrarouge

Country Status (7)

Country Link
US (1) US4429224A (fr)
EP (1) EP0050751B1 (fr)
JP (1) JPS5797481A (fr)
AT (1) ATE24786T1 (fr)
AU (1) AU542797B2 (fr)
CH (1) CH650604A5 (fr)
DE (1) DE3175818D1 (fr)

Families Citing this family (30)

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Publication number Priority date Publication date Assignee Title
JPS6047977A (ja) * 1983-08-26 1985-03-15 Matsushita Electric Works Ltd 赤外線人体検知装置
DE3562062D1 (en) * 1984-06-29 1988-05-05 Siemens Ag X-ray diagnostic apparatus with a regulating device for the x-ray tube high voltage supply
GB2165639B (en) * 1984-08-24 1988-01-27 Philips Electronic Associated Pyroelectric infra-red detector
JPS61126433A (ja) * 1984-11-22 1986-06-13 Matsushita Electric Works Ltd 熱線検知器
US4644164A (en) * 1985-01-04 1987-02-17 Cerberus Ag Compact passive infrared intrusion sensor
DE3666887D1 (en) * 1985-09-02 1989-12-14 Heimann Gmbh Infrared movement detector
JPH0613514Y2 (ja) * 1985-12-23 1994-04-06 松下電工株式会社 熱線感知器
US4757204A (en) * 1986-01-28 1988-07-12 Cerberus Ag Ceiling mounted passive infrared intrusion detector with dome shaped lens
GB2198842B (en) * 1986-12-19 1991-01-02 Philips Electronic Associated Movement sensing infra-red system
GB2213927A (en) * 1987-12-18 1989-08-23 Philips Electronic Associated Pyroelectric infrared sensors
US4841284A (en) * 1987-10-19 1989-06-20 C & K Systems, Inc. Infrared intrusion detection system incorporating a fresnel lens and a mirror
US4939359A (en) * 1988-06-17 1990-07-03 Pittway Corporation Intrusion detection system with zone location
DE9314604U1 (de) * 1993-09-27 1993-12-09 Siemens Ag Infrarot-Bewegungsmelder
US5414255A (en) * 1993-11-08 1995-05-09 Scantronic Limited Intrusion detector having a generally planar fresnel lens provided on a planar mirror surface
US5442178A (en) * 1994-03-18 1995-08-15 Hubbell Incorporated Cross-over field-of-view composite Fresnel lens for an infrared detection system
IL112396A (en) * 1995-01-19 1999-05-09 Holo Or Ltd Intrusion detector
US5626417A (en) * 1996-04-16 1997-05-06 Heath Company Motion detector assembly for use with a decorative coach lamp
US5929445A (en) * 1996-09-13 1999-07-27 Electro-Optic Technologies, Llc Passive infrared detector
US6037594A (en) * 1998-03-05 2000-03-14 Fresnel Technologies, Inc. Motion detector with non-diverging insensitive zones
US6690018B1 (en) 1998-10-30 2004-02-10 Electro-Optic Technologies, Llc Motion detectors and occupancy sensors with improved sensitivity, angular resolution and range
US6756595B2 (en) 2000-09-11 2004-06-29 Electro-Optic Technologies, Llc Effective quad-detector occupancy sensors and motion detectors
US7187505B2 (en) * 2002-10-07 2007-03-06 Fresnel Technologies, Inc. Imaging lens for infrared cameras
JP4250696B2 (ja) * 2002-11-18 2009-04-08 オプテックス株式会社 センサ
US8138478B2 (en) * 2005-03-21 2012-03-20 Visonic Ltd. Passive infra-red detectors
DE102005046019A1 (de) * 2005-09-26 2007-04-05 Hella Kgaa Hueck & Co. Überwachungseinrichtung für den Innenraum eines Kraftfahrzeugs
US8211871B2 (en) 2005-10-31 2012-07-03 Coloplast A/S Topical skin barriers and methods of evaluation thereof
WO2008012805A2 (fr) * 2006-07-27 2008-01-31 Visonic Ltd Détecteurs infrarouge passifs
WO2013072916A1 (fr) 2011-11-16 2013-05-23 Visonic Ltd. Systèmes et méthodologies de détection de mouvements
US9123222B2 (en) 2012-03-15 2015-09-01 Ninve Jr. Inc. Apparatus and method for detecting tampering with an infra-red motion sensor
JP6508448B2 (ja) * 2014-03-17 2019-05-08 株式会社リコー 検出器、センシング装置及び制御システム

Citations (8)

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Publication number Priority date Publication date Assignee Title
US3703718A (en) * 1971-01-07 1972-11-21 Optical Coating Laboratory Inc Infrared intrusion detector system
US3760399A (en) * 1971-12-20 1973-09-18 Barnes Eng Co Intrusion detector
US3829693A (en) * 1973-10-03 1974-08-13 Barnes Eng Co Dual field of view intrusion detector
US4081680A (en) * 1976-06-21 1978-03-28 Cerberus Ag Infrared radiation-burglary detector
GB2012045A (en) * 1977-12-22 1979-07-18 Carbocraft Ltd Infrared surveillance systems
US4166955A (en) * 1977-06-24 1979-09-04 Cerberus Ag Radiation detector and method of operating the same
US4179691A (en) * 1976-11-15 1979-12-18 Cerberus Ag Infrared intrusion detector circuit
EP0014825A2 (fr) * 1979-02-07 1980-09-03 Heimann GmbH Dispositif optique pour la détection passive à rayonnement infrarouge de mouvement

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US3702937A (en) * 1968-05-01 1972-11-14 Microlens Inc Motion detector
CH596621A5 (fr) * 1976-06-30 1978-03-15 Cerberus Ag
CA1095302A (fr) * 1979-06-11 1981-02-10 Zbigniew W. Turlej Traduction non-disponible

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3703718A (en) * 1971-01-07 1972-11-21 Optical Coating Laboratory Inc Infrared intrusion detector system
US3703718B1 (fr) * 1971-01-07 1982-04-13
US3760399A (en) * 1971-12-20 1973-09-18 Barnes Eng Co Intrusion detector
US3829693A (en) * 1973-10-03 1974-08-13 Barnes Eng Co Dual field of view intrusion detector
US4081680A (en) * 1976-06-21 1978-03-28 Cerberus Ag Infrared radiation-burglary detector
US4179691A (en) * 1976-11-15 1979-12-18 Cerberus Ag Infrared intrusion detector circuit
US4166955A (en) * 1977-06-24 1979-09-04 Cerberus Ag Radiation detector and method of operating the same
GB2012045A (en) * 1977-12-22 1979-07-18 Carbocraft Ltd Infrared surveillance systems
EP0014825A2 (fr) * 1979-02-07 1980-09-03 Heimann GmbH Dispositif optique pour la détection passive à rayonnement infrarouge de mouvement

Also Published As

Publication number Publication date
ATE24786T1 (de) 1987-01-15
CH650604A5 (de) 1985-07-31
DE3175818D1 (en) 1987-02-12
EP0050751A1 (fr) 1982-05-05
AU7669481A (en) 1982-04-29
JPS5797481A (en) 1982-06-17
AU542797B2 (en) 1985-03-14
US4429224A (en) 1984-01-31

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