EP0050751A1 - 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
EP0050751A1
EP0050751A1 EP81107844A EP81107844A EP0050751A1 EP 0050751 A1 EP0050751 A1 EP 0050751A1 EP 81107844 A EP81107844 A EP 81107844A EP 81107844 A EP81107844 A EP 81107844A EP 0050751 A1 EP0050751 A1 EP 0050751A1
Authority
EP
European Patent Office
Prior art keywords
arrangement according
sensor element
reception areas
reflectors
radiation
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.)
Granted
Application number
EP81107844A
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German (de)
English (en)
Other versions
EP0050751B1 (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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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
    • 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 with a plurality of optical bundling means which bundle the infrared radiation incident from a plurality of separate reception areas onto at least one common sensor element.
  • 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 evaluation circuit to indicate an intruder and to give an alarm signal.
  • the object of the invention is to avoid the disadvantages of the prior art mentioned and in particular to provide an infrared intrusion detector which emits a larger amount of radiation from the individual reception areas is able to record, which has an increased sensitivity and smaller dimensions.
  • this object is achieved in that a first bundling means is provided which is common to all reception areas and which directs the radiation incident from all reception areas to a plurality of further bundling means, each of which is assigned to one of the reception areas and the number of which corresponds to the number of reception areas and which are arranged and designed such that the radiation arriving from each of the reception areas is focused onto the sensor element by the first common focusing means and then by the respectively associated further focusing means.
  • a converging lens 1 is provided as the first focusing means, which in this example is designed as a Fresnel lens.
  • 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 can also 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 designed as concave or convex spherical, paraboloid or ellipsoid segments or as plane mirrors inclined towards 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 (LiTa0 3 ), polyvinyl difluoride (PVF 2 ), lead zirconate titanate (PZT) or another suitable pyroelectric sensor.
  • the focal length of the Fresnel lens 1, the curvature, the orientation 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.
  • FIG. 2 shows a similar arrangement, which differs from the first embodiment in that the sensor element 7 is arranged peripherally, ie 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.
  • R e-reflectors 2, 3 and 4 only slightly curved or plane form to keep as small as possible in order aberration due to oblique radiation invasion.
  • 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 corresponds, for example, to US Pat. No. 4,179,691 or US 4 166 955 can be formed.
  • the output signal of this evaluation circuit 8 is taken from the output terminals 9.
  • the back 12 carries a facet mirror 13, the individual facets of which correspond to the reflectors 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 ', 711) 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 loss of intensity or sensitivity, since each sensor element receives all of the radiation from the common focusing means.
  • the individual reception areas are each split into a bundle of several reception areas lying on one level. This makes 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. On the back 12 there are individual reflectors 2, 3,... 6 in a row next to one another intended.
  • 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 directly impinging 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 can have the shape of wedges 16, 16 'on their front or rear side, which wedge Replace 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.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
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 true EP0050751A1 (fr) 1982-05-05
EP0050751B1 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)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2165639A (en) * 1984-08-24 1986-04-16 Philips Electronic Associated Pyroelectric infra-red detector
US4644164A (en) * 1985-01-04 1987-02-17 Cerberus Ag Compact passive infrared intrusion sensor
EP0218055A1 (fr) * 1985-09-02 1987-04-15 Heimann GmbH Détecteur de mouvement à infrarouge
US4679218A (en) * 1984-06-29 1987-07-07 Siemens Aktiengesellschaft X-ray diagnostic installation having a control system for the x-ray tube high voltage
GB2198842A (en) * 1986-12-19 1988-06-22 Philips Electronic Associated Movement sensing infra-red system
GB2213927A (en) * 1987-12-18 1989-08-23 Philips Electronic Associated Pyroelectric infrared sensors
DE9314604U1 (de) * 1993-09-27 1993-12-09 Siemens AG, 80333 München Infrarot-Bewegungsmelder
WO1998011521A1 (fr) * 1996-09-13 1998-03-19 Stephen Barone Detecteur de rayons infrarouges passif
US6690018B1 (en) 1998-10-30 2004-02-10 Electro-Optic Technologies, Llc Motion detectors and occupancy sensors with improved sensitivity, angular resolution and range
US6921900B2 (en) 2000-09-11 2005-07-26 Electro-Optic Technologies, Llc Effective quad-detector occupancy sensors and motion detectors
EP1767415A1 (fr) * 2005-09-26 2007-03-28 Hella KGaA Hueck & Co. Dispositif de surveillance de l'habitacle d'un véhicule

Families Citing this family (19)

* Cited by examiner, † Cited by third party
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
JPS61126433A (ja) * 1984-11-22 1986-06-13 Matsushita Electric Works Ltd 熱線検知器
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
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
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
US6037594A (en) * 1998-03-05 2000-03-14 Fresnel Technologies, Inc. Motion detector with non-diverging insensitive zones
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
WO2006100672A2 (fr) * 2005-03-21 2006-09-28 Visonic Ltd. Detecteurs passifs a infrarouge
US8211871B2 (en) 2005-10-31 2012-07-03 Coloplast A/S Topical skin barriers and methods of evaluation thereof
GB2453484B (en) * 2006-07-27 2009-12-02 Visonic Ltd Passive infrared detectors
GB2509884B (en) 2011-11-16 2018-10-17 Tyco Fire & Security Gmbh Motion detection systems and methodologies
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 (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3702937A (en) * 1968-05-01 1972-11-14 Microlens Inc Motion detector
US4052616A (en) * 1976-06-30 1977-10-04 Cerberus Ag Infrared radiation-burglary detector
EP0021630A2 (fr) * 1979-06-11 1981-01-07 Isotec Industries Limited Détecteur d'intrusion à infrarouges et système optique pour un tel détecteur

Family Cites Families (8)

* 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
BE793058A (fr) * 1971-12-20 1973-06-20 Barnes Eng Co Detecteur d'intrusion
US3829693A (en) * 1973-10-03 1974-08-13 Barnes Eng Co Dual field of view intrusion detector
CH596620A5 (fr) * 1976-06-21 1978-03-15 Cerberus Ag
CH599642A5 (fr) * 1976-11-15 1978-05-31 Cerberus Ag
CH617279A5 (fr) * 1977-06-24 1980-05-14 Cerberus Ag
GB2012045B (en) * 1977-12-22 1982-07-21 Carbocraft Ltd Infrared surveillance systems
DE2904654A1 (de) * 1979-02-07 1980-08-14 Heimann Gmbh Optische anordnung fuer einen passiven infrarot-bewegungsmelder

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3702937A (en) * 1968-05-01 1972-11-14 Microlens Inc Motion detector
US4052616A (en) * 1976-06-30 1977-10-04 Cerberus Ag Infrared radiation-burglary detector
EP0021630A2 (fr) * 1979-06-11 1981-01-07 Isotec Industries Limited Détecteur d'intrusion à infrarouges et système optique pour un tel détecteur

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4679218A (en) * 1984-06-29 1987-07-07 Siemens Aktiengesellschaft X-ray diagnostic installation having a control system for the x-ray tube high voltage
GB2165639A (en) * 1984-08-24 1986-04-16 Philips Electronic Associated Pyroelectric infra-red detector
US4644164A (en) * 1985-01-04 1987-02-17 Cerberus Ag Compact passive infrared intrusion sensor
EP0218055A1 (fr) * 1985-09-02 1987-04-15 Heimann GmbH Détecteur de mouvement à infrarouge
US4752769A (en) * 1985-09-02 1988-06-21 Heimann Gmbh Infrared motion alarm
GB2198842A (en) * 1986-12-19 1988-06-22 Philips Electronic Associated Movement sensing infra-red system
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
DE9314604U1 (de) * 1993-09-27 1993-12-09 Siemens AG, 80333 München Infrarot-Bewegungsmelder
WO1998011521A1 (fr) * 1996-09-13 1998-03-19 Stephen Barone Detecteur de rayons infrarouges passif
US5929445A (en) * 1996-09-13 1999-07-27 Electro-Optic Technologies, Llc Passive infrared detector
US6239437B1 (en) 1996-09-13 2001-05-29 Electro-Optic Technologies, Llc Passive infrared detector
US6690018B1 (en) 1998-10-30 2004-02-10 Electro-Optic Technologies, Llc Motion detectors and occupancy sensors with improved sensitivity, angular resolution and range
US7053374B2 (en) 1998-10-30 2006-05-30 Electro-Optic Technologies, Llc Motion detectors and occupancy sensors with improved sensitivity, angular resolution and range
US6921900B2 (en) 2000-09-11 2005-07-26 Electro-Optic Technologies, Llc Effective quad-detector occupancy sensors and motion detectors
EP1767415A1 (fr) * 2005-09-26 2007-03-28 Hella KGaA Hueck & Co. Dispositif de surveillance de l'habitacle d'un véhicule

Also Published As

Publication number Publication date
ATE24786T1 (de) 1987-01-15
AU7669481A (en) 1982-04-29
AU542797B2 (en) 1985-03-14
JPS5797481A (en) 1982-06-17
DE3175818D1 (en) 1987-02-12
EP0050751B1 (fr) 1987-01-07
CH650604A5 (de) 1985-07-31
US4429224A (en) 1984-01-31

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