EP0421119B1 - Indicateur passif de mouvement infrarouge - Google Patents

Indicateur passif de mouvement infrarouge Download PDF

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Publication number
EP0421119B1
EP0421119B1 EP90116453A EP90116453A EP0421119B1 EP 0421119 B1 EP0421119 B1 EP 0421119B1 EP 90116453 A EP90116453 A EP 90116453A EP 90116453 A EP90116453 A EP 90116453A EP 0421119 B1 EP0421119 B1 EP 0421119B1
Authority
EP
European Patent Office
Prior art keywords
infrared
incident
fresnel lens
detection
infrared rays
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
EP90116453A
Other languages
German (de)
English (en)
Other versions
EP0421119A1 (fr
Inventor
Hans Jochem Schulte
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.)
ABB AG Germany
ABB AB
Original Assignee
Asea Brown Boveri AG Germany
Asea Brown Boveri AB
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 Asea Brown Boveri AG Germany, Asea Brown Boveri AB filed Critical Asea Brown Boveri AG Germany
Publication of EP0421119A1 publication Critical patent/EP0421119A1/fr
Application granted granted Critical
Publication of EP0421119B1 publication Critical patent/EP0421119B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL 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 invention relates to a passive infrared motion detector according to the preamble of claim 1.
  • Passive infrared motion detectors are essentially devices which trigger a switching process as a function of the detected infrared radiation of an object emitting heat radiation. They are used to monitor a room area for moving objects, whereby the passive infrared motion detectors e.g. react to the change in heat radiation in the detection area to be monitored. Such an infrared radiation object is e.g. a person who moves in a room to be monitored.
  • a passive infrared motion detector only works as a receiver of infrared heat radiation, whereas other types of infrared motion detectors have an active infrared transmitter.
  • a passive infrared motion detector with an azimuthal detection angle of 180 ° which has an infrared sensitive sensor inside a housing.
  • a wide-angle collecting optic in particular a Fresnel plastic lens.
  • frontally incident infrared rays from the detection area to be monitored are bundled directly onto the infrared sensor, whereas laterally infrared rays incident from the detection area are focused on the infrared sensor only after intermediate reflection on a deflecting mirror system.
  • the largest possible detection range is aimed at with passive infrared motion detectors and at the same time high detection sensitivity. Due to the fact that in the passive infrared motion detector known from the prior art, the infrared rays incident laterally from the detection area are focused on the infrared sensor by means of intermediate reflection at a deflecting mirror system, the intensity of the incident on the infrared sensor is ultimately due to scattering losses Radiation is reduced compared to the radiation emitted directly by the object. This leads to a narrowing of the detection characteristic in the lateral area.
  • the passive infrared motion detector known in the prior art is highly sensitive, in particular to temperature changes occurring in the front detection area.
  • this fundamentally desirable fact is disadvantageous if switching operations are already triggered by objects which are not intentionally detected, in particular small animals, or by air currents passing by.
  • the measure known in the prior art has proven itself to be arranged on the sensor side, at a distance behind the plastic Fresnel lens, to arrange a plastic film which transmits infrared radiation. This has two effects.
  • the entire frontal and lateral incident infrared radiation is attenuated in intensity and secondly, a heat-insulating air cushion is generated between the plastic Fresnel lens and the plastic damping film, which creates the heat generated inside the passive infrared motion detector due to the evaluation electronics there does not let outside.
  • additional attenuation means are provided in the beam path of the infrared rays incident on the infrared sensor from the front detection area compared to the infrared rays incident from the lateral detection area.
  • This has the effect that the transmittance for the infrared rays incident from the front detection area is lower than the transmittance of the infrared rays incident on the infrared sensor from the lateral detection area.
  • the transmittance is defined as the ratio of the radiation intensity weakened after passing through a medium to the initial radiation intensity, in which case the initial radiation intensity in the beam path in front of the Fresnel lens and the weakened radiation intensity directly in front of the infrared sensor are measured.
  • An infrared-permeable plastic film is advantageously provided as a damping means in the beam path of the frontally incident infrared rays, the transmittance of which is known to be essentially a function of the infrared wavelength to be transmitted, the material and the film thickness.
  • films have proven their worth, the transmittance of which is between 58% and 68% at a wavelength of 10 »m.
  • the damping effect can also be achieved with other measures, e.g. by means of a varnish applied to the Fresnel plastic lens or by a different thickness of the Fresnel plastic lens.
  • the use of a plastic damping film offers the advantage that a heat insulation layer is present in the front detection area, in which the detection sensitivity is particularly high, because of the aforementioned air cushion, due to which undesired switching operations can be largely prevented.
  • the Fresnel lens system used as a wide-angle collecting optic is realized by a plastic Fresnel lens which is bent in a semicircular convex manner into the detection area.
  • strip-like segments covering the azimuthal detection area are semicircular arranged side by side, which have Fresnel lenses stamped into the plastic film.
  • At least two zones of segmented central Fresnel lenses are provided for the detection of the infrared rays incident from the front detection area. This makes it impossible to undermine the frontal detection area.
  • segments with acentric Fresnel lenses are arranged laterally next to the segments assigned to the frontally incident infrared rays.
  • the teaching according to the invention combined with the acentric Fresnel lenses described above thus offers the decisive advantage that the azimuthal detection range of the passive infrared motion detector extends beyond 180 ° to e.g. Can be extended by 220 °.
  • FIG. 1 shows a frontal view of the passive infrared motion detector 1 according to the invention with a window-like housing recess 3 in a housing 2.
  • a Fresnel lens film 4 made of plastic is clamped in a semicircular convex manner in the housing recess 3.
  • Infrared rays S I incident frontally from a first detection area I are bundled directly onto infrared sensors 9 by means of the Fresnel lens film 4.
  • Infrared rays S II incident laterally from a second detection area II are focused on the infrared sensors 9 with the help of the Fresnel lens film 4 only after intermediate reflection at two deflecting mirrors 8.
  • the Fresnel lens plastic film 4 is convex in a semicircular shape into the detection areas I, II to be monitored and is held in a Fresnel lens mount 5 of the housing 2.
  • I infrared rays S I-plastic film
  • Fresnel lens 4 is permeable to infrared damping plastic film 6 provided in the beam path behind the and supported film version cushion 7 in a.
  • An air cushion 10 is formed behind the Fresnel lens plastic film 4 and the damping plastic film 6, which is largely sealed off from the ambient air with the aid of end webs 11.
  • the infrared sensors 9 are arranged centrally on a circuit board 12, onto which the infrared rays S II incident laterally from the second detection area II are focused via two deflection mirrors 8. Frontal incident from the first detection area I I S infrared rays are bundled without intermediate reflection directly to the infrared sensors. 9
  • FIG. 3 shows a first detection characteristic 13, known in the prior art, of the passive infrared motion detector 1 without a damping plastic film 6.
  • An indented constriction 15 for the laterally incident infrared rays can be clearly seen. This is essentially due to the fact that, due to the intermediate reflection at the deflecting mirrors 8, the infrared rays S II are scattered on the material of the deflecting mirrors 8, which is associated with a loss of energy and thus an intensity.
  • a second detection characteristic 14 arises if both those incident from the front from the first detection area I and those incident laterally from the second detection area II Infrared rays S I , S II can be additionally damped with the damping plastic film 6. It can be seen that the shape of the detection characteristics 13, 14 is essentially retained, whereas a detection range r which is variable over an azimuth angle ⁇ is reduced in the detection characteristic 14 compared to the detection characteristic 13.
  • a fourth detection characteristic 17 results when the teaching according to the invention is used in combination with a Fresnel lens film 4 with laterally acentric Fresnel lens segments 18, which is described in more detail below. As a result, the azimuthal detection area can then be expanded by a third detection area III to a total of 220 ° (cf. also FIG. 2).
  • Fig. 5 shows a comparison of various laterally and frontally incident infrared useful signals at different noise levels and different arrangements of the damping foils 6.
  • a resulting noise level R2 is relatively high.
  • the damping by the Fresnel lens plastic film is not considered in this qualitative discussion.
  • a comparison of the curves a I, II shows that the signal / noise ratio of the frontally incident useful signal a I is greater than that of the laterally incident useful signal a II .
  • an increased signal / noise ratio means higher sensitivity.
  • a passive infrared motion detector in which both the frontal and the laterally incident infrared rays S I , S II are covered by a damping film 6, has a significantly reduced background noise R0.
  • laterally incident useful signals C II are not only attenuated by the already mentioned proportion ⁇ I d , which is due to the scattering at the deflection mirrors 8, but additionally attenuated by ⁇ I a by the damping plastic film 6.
  • a frontally incident useful signal represented by curve C I has an intensity which is only reduced by the damping measure ⁇ I a .
  • the laterally incident infrared rays S II have a more favorable signal-to-noise ratio than the frontally incident infrared rays S I. This results in the improved third detection characteristic 16 described above.
  • Fresnel lens plastic film 4 which is divided into individual strip-shaped Fresnel lens segments 18.
  • Each segment 18 represents a Fresnel lens, which bundles infrared rays S I , S II , S III incident from different spatial sectors.
  • the frontally incident infrared rays S I are assigned two zones of Fresnel lens segments 18 arranged one above the other. This has the advantage that it is no longer possible to undermine the frontal detection area I.
  • the Fresnel lens plastic film 4 is that the, preferably four, laterally arranged Fresnel lens segments 18 are designed as eccentric Fresnel lenses, the respective lens centers 19 of which lie outside the Fresnel lens segment 18.
  • the azimuthal detection area can be expanded to a total of 220 °, since incident areas from a third detection area III (FIG. 2) third infrared rays S III can still be detected because of the improved detection sensitivity according to the invention.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Switches Operated By Changes In Physical Conditions (AREA)
  • Transforming Light Signals Into Electric Signals (AREA)

Claims (5)

  1. Détecteur de mouvement passif à infrarouge comprenant au moins un capteur à infrarouge disposé à l'intérieur d'un boîtier, ainsi qu'au moins une ouverture prévue dans le boîtier et présentant un système de lentille de Fresnel, des premiers rayons infrarouges arrivant frontalement d'une première zone de détection étant focalisés par des lentilles de Fresnel associées du système de lentille de Fresnel sur le capteur à infrarouge, et des seconds rayons infrarouges arrivant latéralement d'une seconde zone de détection étant focalisés par des lentilles de Fresnel associées du système de lentille de Fresnel sur le capteur à infrarouge après réflexion intermédiaire sur un système de miroirs de déviation, caractérisé par le fait que des moyens d'atténuation (6) sont prévus, sous l'effet desquels le degré de transmission (TI) pour les premiers rayons infrarouges (SI) arrivant sur le capteur à infrarouge (9) à partir de la première zone de détection (I) est plus faible que le degré de transmission (TII) pour les seconds rayons infrarouges (SII) arrivant sur le capteur à infrarouge (9) à partir de la seconde zone de détection (II).
  2. Détecteur de mouvement passif à infrarouge suivant la revendication 1, caractérisé par le fait que le moyen d'atténuation (6) est constitué par une feuille d'atténuation en matière plastique, laissant passer les rayons infrarouges.
  3. Détecteur de mouvement passif à infrarouge suivant la revendication 1 ou 2, caractérisé par le fait que le système de lentille de Fresnel est constitué par une feuille de matière plastique (4) réalisée sous forme de lentille de Fresnel en matière plastique, dont les segments (18) formant lentilles de Fresnel, en forme de rubans, couvrant la zone de détection azimutale (I, II) et présentant des lentilles de Fresnel formées dans la feuille sont disposés côte-à-côte en demi-cercle.
  4. Détecteur de mouvement passif à infrarouge suivant la revendication 3, caractérisé par le fait qu'au moins deux zones superposées de lentilles de Fresnel segmentées centrées, de préférence au nombre de huit chacune, sont prévues pour la détection des premiers rayons infrarouges (SII) arrivant de la première zone de détection (I).
  5. Détecteur de mouvement passif à infrarouge suivant l'une des revendications précédentes, caractérisé par le fait que des segments (18) de lentilles de Fresnel, disposés latéralement, sont prévus pour la détection des rayons infrarouges (SII, SIII) arrivant de la seconde et de la troisième zones de détection (II, III), lesdits segments étant réalisés sous forme de lentilles de Fresnel acentrées avec des centres de lentilles de Fresnel (19) situés à l'extérieur des segments (18) fr lentilles de Fresnel.
EP90116453A 1989-10-03 1990-08-28 Indicateur passif de mouvement infrarouge Expired - Lifetime EP0421119B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3932943 1989-10-03
DE3932943A DE3932943A1 (de) 1989-10-03 1989-10-03 Passiv-infrarot-bewegungsmelder

Publications (2)

Publication Number Publication Date
EP0421119A1 EP0421119A1 (fr) 1991-04-10
EP0421119B1 true EP0421119B1 (fr) 1994-06-22

Family

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Family Applications (1)

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EP90116453A Expired - Lifetime EP0421119B1 (fr) 1989-10-03 1990-08-28 Indicateur passif de mouvement infrarouge

Country Status (4)

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EP (1) EP0421119B1 (fr)
AT (1) ATE107785T1 (fr)
DE (2) DE3932943A1 (fr)
DK (1) DK0421119T3 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4011453A1 (de) * 1990-04-09 1991-10-10 Abb Patent Gmbh Passiv-infrarot-bewegungsmelder
GB9100791D0 (en) * 1991-01-15 1991-02-27 Smiths Industries Plc Detector assemblies
DE4137560C1 (fr) * 1991-11-15 1993-02-25 Abb Patent Gmbh, 6800 Mannheim, De
DE4333707C2 (de) * 1993-10-02 1996-12-05 Insta Elektro Gmbh & Co Kg Passiv-Infrarot-Bewegungsmelder
DE4337953A1 (de) * 1993-11-06 1995-05-11 Abb Patent Gmbh Vorrichtung zur Erfassung von Lichtstrahlen
EP0666551B1 (fr) * 1994-02-08 1999-12-22 Gebrüder Merten Gmbh & Co. Kg Détecteur de mouvement à infrarouge
DE4428628A1 (de) * 1994-08-12 1996-02-15 Merten Gmbh & Co Kg Geb Infrarot-Bewegungsmelder
JP2005241555A (ja) 2004-02-27 2005-09-08 Optex Co Ltd 受動型赤外線感知器
GB2507818B (en) 2012-11-13 2015-09-09 Pyronix Ltd Infrared detection device and masking section

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3476948A (en) * 1968-02-19 1969-11-04 Sylvania Electric Prod Optical intrusion detection system using reflected dual beam peripheral scanning
DE3381729D1 (de) * 1983-01-05 1990-08-16 Zueblin Marcel Optisches bauelement zum umlenken optischer strahlen.
US4703171A (en) * 1985-11-05 1987-10-27 Target Concepts Inc. Lighting control system with infrared occupancy detector
US4757204A (en) * 1986-01-28 1988-07-12 Cerberus Ag Ceiling mounted passive infrared intrusion detector with dome shaped lens
DE3710614A1 (de) * 1987-03-31 1988-10-20 Siedle & Soehne S Bewegungsmelder
DE3744182C2 (de) * 1987-12-24 1994-06-30 Asea Brown Boveri Infrarotdetektor

Also Published As

Publication number Publication date
DK0421119T3 (da) 1994-10-24
EP0421119A1 (fr) 1991-04-10
ATE107785T1 (de) 1994-07-15
DE59006207D1 (de) 1994-07-28
DE3932943A1 (de) 1991-04-11

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