EP0050750A1 - Détecteur d'intrusion à infrarouge - Google Patents

Détecteur d'intrusion à infrarouge Download PDF

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Publication number
EP0050750A1
EP0050750A1 EP81107843A EP81107843A EP0050750A1 EP 0050750 A1 EP0050750 A1 EP 0050750A1 EP 81107843 A EP81107843 A EP 81107843A EP 81107843 A EP81107843 A EP 81107843A EP 0050750 A1 EP0050750 A1 EP 0050750A1
Authority
EP
European Patent Office
Prior art keywords
radiation
intrusion detector
detector according
designed
collecting element
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
EP81107843A
Other languages
German (de)
English (en)
Other versions
EP0050750B1 (fr
Inventor
Peter Wägli
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 AT81107843T priority Critical patent/ATE9412T1/de
Publication of EP0050750A1 publication Critical patent/EP0050750A1/fr
Application granted granted Critical
Publication of EP0050750B1 publication Critical patent/EP0050750B1/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 infrared intrusion detector with optical bundling means and a sensor arrangement, in which the infrared radiation incident from a plurality of separate reception areas is recorded and evaluated for alarm signaling in the event of a predetermined change in the recorded radiation.
  • the infrared radiation emanating from a person in the monitored area is evaluated. 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.
  • intrusion detectors known from US Pat. No. 3,760,399, US Pat. No. 3,829,693 or US Pat. No. 3,958,118 use a reflector common to all reception areas, which bundles the radiation incident from these reception areas onto a plurality of sensor elements arranged next to one another. Since a large number of such sensor elements are used, however, a complicated and fault-prone evaluation circuit is required, to which this large number of sensor elements is connected. In addition, the number of possible sensor elements and thus the number and Selection of reception areas severely restricted.
  • an infrared radiation intrusion detector in which reflector surfaces are formed as part of a spherical surface, the selected surface part determines the detectable solid angle.
  • the IR radiation is directed to a radiation receiver via a radiation conductor bundle composed of a large number of individual radiation-conducting elements (e.g. internally braced hollow conductor).
  • the combination of the radiation beam onto a sensibly small detector is, however, technically difficult to implement.
  • DE-OS 2 836 462 describes a room surveillance reception device in which the IR radiation falls from a focusing lens through a tube onto a radiation converter arranged in the focal plane. Through a reflective layer arranged on the inside of the tube, radiation from further, sector-shaped areas is thrown onto the transducer by multiple reflection. However, the sensitivity of the monitoring device is greatly reduced for the outside areas because of the curved focus surface of the focusing means.
  • 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, with high sensitivity with a single sensor element and a simple optical arrangement with small dimensions, provides infrared radiation from a multiplicity of arbitrarily selectable reception areas safely and without interference is able to record.
  • the sensor arrangement has an elongated radiation collecting element which is arranged at least approximately in the focus surface of the focusing means, the surface of which is designed to be reflective inwards and which has a plurality of radiation entry openings on its long side and an infrared sensor element on one end.
  • Figures 1 a and 1 b show an optical arrangement for an infrared intrusion detector in top view and in cross section.
  • a reflector 1 is provided as the focusing means, which can be designed, for example, as a spherical mirror with a center point C.
  • the focus surface F of such a spherical mirror is known to be a concentric sphere with a half radius.
  • an elongated element 2 is arranged, which serves to collect the infrared radiation focused on the focus area F.
  • This radiation collecting element 2 can be designed, for example, as an air-accessible tube with a mirrored inner surface 3, or as an IR radiation-transparent transparent body, on the surface of which a reflective layer 3 is applied.
  • the cross section of this element can be circular, for example, for reasons of simpler manufacture or adjustability.
  • the axis of this elongated element 2 is curved in accordance with the focus surface F.
  • it can expediently be designed to be flexible.
  • an appropriately corrected optics as a bundling means can also a tube or transparent body with a straight axis can be used.
  • a sensor element 5 is attached to one end of the tube, the other is mirrored or carries a further sensor element.
  • radiation inlet openings 4 are provided on the surface thereof. These can be designed as holes in the jacket of the collecting element 2 as an air-filled tube, and as interruptions in the reflective coating 3 as a transparent body.
  • the radiation that has entered through these radiation inlet openings 4 is reflected many times inside the radiation collecting element 2 on its inner surface 3 and finally arrives at the sensor element 5 attached to one end face, which is connected to an evaluation circuit by means of connecting lines 6. Since the area of the radiation inlet openings 4 only makes up a very small part of the entire inner surface of the radiation collecting element 2, practically all of the radiation that has entered the inside of the collecting element 2 reaches the sensor element 5 without any significant losses.
  • the radiation entrance openings 4 mentioned are now ' just attached at the points where the radiation arriving from certain desired reception areas is focused by the reflector 1.
  • Each radiation entry opening 4 is assigned a specific radiation reception area, the opening angle of which depends on the dimensions of the radiation entry opening 4 and the quality of the image.
  • the radiation inlet openings 4 can be provided on the surface of the radiation collecting element 2.
  • the arrangement can thus be easily adapted to the desired conditions of use.
  • a particularly simple optic is completely sufficient, and only a single sensor element is required, which can be connected to a correspondingly simple and fault-prone evaluation circuit. Since no segment optics are required, but only a single reflector, optimal sensitivity can be achieved.
  • the bundling means designed as a spherical mirror used in the example described can also be designed in a different way.
  • a parabolic mirror can be used that provides a better image at least in the vicinity of the axis
  • refractive optics can be used that can be easily corrected so that the focus surface is not very curved, i.e. is almost flat, so that the radiation collecting element 2 can have a cylindrical shape with a straight axis.
  • FIG. 2 shows an exemplary embodiment with a collecting lens 10 as a focusing means.
  • the radiation collecting element 2 is configured analogously to the previous example and is arranged in the focus surface F of the collecting lens 10.
  • Each of the radiation inlet openings 4 corresponds to a separate reception direction or reception area A 1 , A 2 ... A 5.
  • FIG. 3 shows an infrared intrusion detector with a housing 9, the front side of which is taken up by a bundling means 11, which is designed as a central section of a Fresnel step lens.
  • a bundling means 11 which is designed as a central section of a Fresnel step lens.
  • the distance from the front 9 'of the focal length f corresponds to the Fresnel lens 11, a tubular radiation collecting element 2 with different openings 4 facing the Fresnel lens 11 is again provided.
  • Each opening 4 in turn corresponds to a radiation receiving area, and this evaluation circuit 7 emits a signal via signal lines 8 as soon as the infrared radiation picked up by the sensor element 5 changes in a manner characteristic of the movement of an intruder through the radiation receiving areas.
  • one or more prisms can be provided in front of or behind parts of the converging lens, 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.
  • a prism 12 can be arranged in front of the lower half of the Fresnel lens 11. This has the effect that the radiation impinging on the lower half is deflected by a certain angle, while the radiation impinging on the upper half remains unaffected.
  • Each reception area is therefore split into two separate areas.
  • the upper half of the lens focuses radiation from direction A 31 onto the middle opening 4 and the lower half the inclined direction A 32 .
  • an infrared intrusion detector can be created in a single way, the reception areas of which have the shape of two radiation curtains to be passed one after the other.
  • 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.
  • one half of the Fresnel lens 11 can have the shape of a wedge 13 on its front or rear side, which replaces the prism 12 and has 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.
  • the Frensel lens from a material that is preferably transparent in the spectral range of the body radiation in the far infrared and also to use a preferably infrared-sensitive element, for example a pyroelectric element, as the sensor element Element, of the lithium tantalate, polyvinyl difluoride or lead zirconate titanate type.
  • the intrusion detector according to FIG. 3 can be further developed in that the radiation-collecting tube 2 is arranged to rotate uniformly about its just formed axis.
  • the openings are then not fixed on a straight line parallel to the axis, but are provided at different angles of rotation on the pipe surface, for example on a helix.
  • the individual openings 14 then come into the focus area one after the other, i.e. they receive radiation from the assigned reception area at different times. This enables the different reception areas to be scanned over time.

Landscapes

  • 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)
EP81107843A 1980-10-24 1981-10-02 Détecteur d'intrusion à infrarouge Expired EP0050750B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81107843T ATE9412T1 (de) 1980-10-24 1981-10-02 Infrarot-einbruchdetektor.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH7926/80A CH650605A5 (de) 1980-10-24 1980-10-24 Infrarot-einbruchdetektor.
CH7926/80 1980-10-24

Publications (2)

Publication Number Publication Date
EP0050750A1 true EP0050750A1 (fr) 1982-05-05
EP0050750B1 EP0050750B1 (fr) 1984-09-12

Family

ID=4332490

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81107843A Expired EP0050750B1 (fr) 1980-10-24 1981-10-02 Détecteur d'intrusion à infrarouge

Country Status (7)

Country Link
US (1) US4429223A (fr)
EP (1) EP0050750B1 (fr)
JP (1) JPS5797482A (fr)
AT (1) ATE9412T1 (fr)
AU (1) AU542979B2 (fr)
CH (1) CH650605A5 (fr)
DE (1) DE3166056D1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2198842A (en) * 1986-12-19 1988-06-22 Philips Electronic Associated Movement sensing infra-red system
WO1998011521A1 (fr) * 1996-09-13 1998-03-19 Stephen Barone Detecteur de rayons infrarouges passif
US6194711B1 (en) * 1997-03-12 2001-02-27 Seiko Instruments Inc. Scanning near-field optical microscope
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

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2213927A (en) * 1987-12-18 1989-08-23 Philips Electronic Associated Pyroelectric infrared sensors

Citations (3)

* 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
US4052616A (en) * 1976-06-30 1977-10-04 Cerberus Ag Infrared radiation-burglary detector
DE2836462A1 (de) * 1978-08-21 1980-03-06 Woerl Alarm August Woerl Inhab Raumueberwachungs-empfangseinrichtung

Patent Citations (4)

* 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
US4052616A (en) * 1976-06-30 1977-10-04 Cerberus Ag Infrared radiation-burglary detector
DE2836462A1 (de) * 1978-08-21 1980-03-06 Woerl Alarm August Woerl Inhab Raumueberwachungs-empfangseinrichtung

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
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
US6194711B1 (en) * 1997-03-12 2001-02-27 Seiko Instruments Inc. Scanning near-field optical microscope
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

Also Published As

Publication number Publication date
AU7669381A (en) 1982-04-29
US4429223A (en) 1984-01-31
AU542979B2 (en) 1985-03-28
ATE9412T1 (de) 1984-09-15
EP0050750B1 (fr) 1984-09-12
CH650605A5 (de) 1985-07-31
JPS5797482A (en) 1982-06-17
DE3166056D1 (en) 1984-10-18

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