EP0218055B1 - Infrared movement detector - Google Patents
Infrared movement detector Download PDFInfo
- Publication number
- EP0218055B1 EP0218055B1 EP86111436A EP86111436A EP0218055B1 EP 0218055 B1 EP0218055 B1 EP 0218055B1 EP 86111436 A EP86111436 A EP 86111436A EP 86111436 A EP86111436 A EP 86111436A EP 0218055 B1 EP0218055 B1 EP 0218055B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- detector
- infrared
- angle
- mirror
- lens
- 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
Links
- 230000005855 radiation Effects 0.000 claims description 9
- 230000003287 optical effect Effects 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 2
- 238000001514 detection method Methods 0.000 description 6
- 238000010276 construction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
Images
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 motion detector according to the first part of the claim.
- Infrared motion detectors which consist of the combination of a mirror and a lens arrangement (US Pat. Nos. 3,766,539, 3,631,434). Because of the simple design of these known infrared motion detectors and the detection of radiation in only one plane, however, no perfect creep protection is guaranteed.
- An infrared motion detector is known from US Pat. No. 3,703,718 in which there are several groups of mirror arrangements which focus the received infrared radiation on an infrared detector. For bundling, the individual mirrors of the mirror arrangements are designed as small concave mirrors, which means a considerable outlay in terms of production technology. It is also known to ensure radiation monitoring in several planes by providing a large number of detectors in a detector array and also a large number of Fresnel lenses (US Pat. No. 4,321,594). With this known infrared motion detector, too, the outlay is relatively great because of the large number of detectors and Fresnel lenses.
- the invention is based on the object of designing an infrared motion detector of the type mentioned at the outset such that reliable creep protection can be achieved with a simple construction.
- FIG. 1 shows an infrared detector 1 which receives infrared radiation via an optical system which is formed by a mirror 2 and a Fresnel lens 3 arranged after and in front of the infrared detector 1 in the beam direction.
- the infrared detector 1 is inclined with respect to its axis 4 with respect to the horizontal 5 by the angle.
- the angle of inclination of the mirror 2 with respect to the horizontal 5 is designated with ex and with respect to the axis 4 with ⁇ o.
- the reflection angles of the mirror 2 have the designations ⁇ and ⁇ and the angle of incidence of the radiation on the infrared detector has the designation ax.
- the focal length of the Fresnel lens 3 is designated f.
- the focal point lies in the detector 1.
- the room height at which the mirror 2 is arranged with its central axis is h.
- the beam emitted by an object at a distance x at the angle y is deflected via the mirror 2 onto the Fresnel lens 3 and strikes the infrared detector 1 at the angle a x .
- Figure 2 shows a lens / mirror combination in a schematic representation, in which the levels E2, E3 and E4 serve for remote security.
- the plane E1 is used in conjunction with the mirror segments M1 to M5 and the Fresnel lens 3 arranged behind it in the beam direction as anti-creep protection.
- the outer mirror segments M1 and M5 protrude from the Fresnel lens 3 in order to expand the original viewing angle of the lens from 130 ° in the close range to 180 ° .
- FIG. 3 shows the beam path of the motion detector according to FIG. 1 not from the side as in FIG. 1, but from above. Accordingly, the x and y axes are shown here, while the z axis runs vertically in space and is perpendicular to the plane of the drawing. The angle of the incident radiation with respect to the y-axis ay is also shown in FIG.
- the beam emanating from an object strikes the mirror 2 parallel to the x-axis (180 ° detection angle) and is deflected by the latter onto the Fresnel lens 3 such that it strikes the infrared detector 1 at the angle ay.
- the angle ay must not be greater than half the viewing angle of the Fresnel lens 3.
- FIG. 4 illustrates the ranges of the individual planes E1 to E4 according to FIG. 2.
- the lens-mirror combination is designated by 2.3.
- FIG. 4 also shows that up to a distance of approximately 0.4 m from the vertical of the motion detector, detection of the infrared radiation emanating from an object is ensured.
- the angle 26 ° is 5 times, the angle 18.6 ° 7 times, the angle 7.8 ° 31 times and the angle 11.8 ° 11 times.
- FIG. 6 shows the detection zones of the anti-creep protection extended to a 180 ° viewing angle, which is implemented in plane E1.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Burglar Alarm Systems (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Description
Die Erfindung betrifft einen Infrarot-Bewegungsmelder gemäß dem ersten Teil des Patentanspruches.The invention relates to an infrared motion detector according to the first part of the claim.
Bei einem Infrarot-Bewegungsmelder dieser Art, der z.B. für den Einbruchalarm dient, besteht die Forderung des Unterkriechschutzes, d.h. der Erfassung von Bewegungen unterhalb des Bewegungsmelders innerhalb einer Zone, die nach Möglichkeit von Wand zu Wand verläuft, also in einem Öffnungswinkel von 180°.In the case of an infrared motion detector of this type, which is used, for example, for the intrusion alarm, there is a requirement for anti-crawl protection, ie the detection of movements below the motion detector within a zone that runs from wall to wall if possible, that is to say at an opening angle of 180 ° .
Es sind Infrarot-Bewegungsmelder bekannt, die aus der Kombination einer Spiegel- und einer Linsenanordnung bestehen (US 3 766 539, 3 631 434). Wegen der einfachen Ausbildung dieser bekannten Infrarot-Bewegungsmelder und der Erfassung der Strahlung in nur einer Ebene ist dabei jedoch kein einwandfreier Unterkriechschutz gewährleistet.Infrared motion detectors are known which consist of the combination of a mirror and a lens arrangement (US Pat. Nos. 3,766,539, 3,631,434). Because of the simple design of these known infrared motion detectors and the detection of radiation in only one plane, however, no perfect creep protection is guaranteed.
Durch die US-A 3 703 718 ist ein Infrarot-Bewegungsmelder bekannt, bei dem mehrere Gruppen von Spiegelanordnungen vorhanden sind, die die empfangene Infrarotstrahlung auf einen Infrarotdetektor bündeln. Zur Bündelung sind dabei die einzelnen Spiegel der Spiegelanordnungen als kleine Hohlspiegel ausgebildet, was einen erheblichen fertigungstechnischen Aufwand bedeutet. Es ist ferner bekannt, die Strahlungsüberwachung in mehreren Ebenen dadurch sicherzustellen, daß eine Vielzahl von Detektoren in einem Detektorarray sowie auch eine Vielzahl von Fresnellinsen vorgesehen werden (US-A 4 321 594). Auch bei diesem bekannten Infrarot-Bewegungsmelder ist der Aufwand wegen der Vielzahl von Detektoren und Fresnellinsen relativ groß.An infrared motion detector is known from US Pat. No. 3,703,718 in which there are several groups of mirror arrangements which focus the received infrared radiation on an infrared detector. For bundling, the individual mirrors of the mirror arrangements are designed as small concave mirrors, which means a considerable outlay in terms of production technology. It is also known to ensure radiation monitoring in several planes by providing a large number of detectors in a detector array and also a large number of Fresnel lenses (US Pat. No. 4,321,594). With this known infrared motion detector, too, the outlay is relatively great because of the large number of detectors and Fresnel lenses.
Der Erfindung liegt die Aufgabe zugrunde, einen Infrarot-Bewegungsmelder der eingangs genannten Art so auszubilden, daß bei einfachem Aufbau ein sicherer Unterkriechschutz erzielbar ist.The invention is based on the object of designing an infrared motion detector of the type mentioned at the outset such that reliable creep protection can be achieved with a simple construction.
Diese Aufgabe ist erfindungsgemäß gelöst durch den zweiten Teil des Patentanspruches. Durch die Hintereinanderschaltung einer Spiegelanordnung und einer Fresnellinse und die geeignete Anordnung ist es bei einfachem Aufbau, insbesondere bei Verwendung eines einzigen Detektors, möglich, die Infrarotstrahlung in einem solchen Bereich zu erfassen, daß ein Unterkriechen des Bewegungsmelders ausgeschlossen ist.This object is achieved by the second part of the claim. Through the series connection of a mirror arrangement and a Fresnel lens and the suitable arrangement, it is possible with a simple construction, in particular when using a single detector, to detect the infrared radiation in such a range that it is impossible for the motion detector to crawl under it.
Die Erfindung ist nachfolgend anhand der Zeichnung näher erläutert. Es zeigen:
- Fig. 1 eine schematische Darstellung eines Bewegungsmelders nach der Erfindung,
- Fig. 2 eine Ausführungsform eines Bewegungsmelders nach der Erfindung,
- Fig. 3 eine andere Ansicht des Bewegungsmelders gemäß Fig. 1, und
- Fig. 4 bis 6 Darstellungen zur Erläuterung des Strahlenverlaufes des Bewegungsmelders gemäß Fig. 2.
- 1 is a schematic representation of a motion detector according to the invention,
- 2 shows an embodiment of a motion detector according to the invention,
- 3 shows another view of the motion detector according to FIG. 1, and
- 4 to 6 representations to explain the beam path of the motion detector according to FIG. 2.
In der Figur 1 ist ein Infrarotdetektor 1 dargestellt, der Infrarotstrahlung über eine Optik empfängt, die von einem Spiegel 2 und einer in Strahlenrichtung danach und vor dem Infrarotdetektor 1 angeordneten Fresnellinse 3 gebildet ist. Der Infrarotdetektor 1 ist hinsichtlich seiner Achse 4 gegenüber der Horizontalen 5 um den Winkel , geneigt. Der Neigungswinkel des Spiegels 2 gegenüber der Horizontalen 5 ist mit ex und gegenüber der Achse 4 mit εo bezeichnet. Die Reflexionswinkel des Spiegels 2 haben die Bezeichnungen δ und β und der Einfallswinkel der Strahlung auf den Infrarotdetektor die Bezeichnung ax. Die Brennweite der Fresnellinse 3 ist mit f bezeichnet. Der Brennpunkt liegt im Detektor 1. Die Raumhöhe, in der der Spiegel 2 mit seiner Mittelachse angeordnet ist, ist h.FIG. 1 shows an infrared detector 1 which receives infrared radiation via an optical system which is formed by a
Der von einem Objekt im Abstand x unter dem Winkel y ausgesandte Strahl wird über den Spiegel 2 auf die Fresnellinse 3 umgelenkt und trifft unter dem Winkel ax auf dem Infrarotdetektor 1 auf. Durch Variation der Spiegelneigung gegen die Horizontale 5 (Winkel ex) läßt sich die Reichweite x bzw. der Einfallswinkel einstellen. Bei einem Winkel εx = 25° und ax = 21,25° ergibt sich eine Reichweite von 0,5 m. Dadurch ist ein einwandfreier Unterkriechschutz gewährleistet.The beam emitted by an object at a distance x at the angle y is deflected via the
Die Figur 2 zeigt eine Linsen/Spiegel-Kombination in schematischer Darstellung, bei der die Ebenen E2, E3 und E4 der Fernabsicherung dienen. Die Ebene E1 dient in Verbindung mit den Spiegelsegmenten M1 bis M5 und der in Strahlenrichtung dahinter angeordneten Fresnellinse 3 als Unterkriechschutz. Die äußeren Spiegelsegmente M1 und M5 stehen von der Fresnellinse 3 ab, um den ursprünglichen Blickwinkel der Linse von 130° im Nahbereich auf 180° zu erweitern.Figure 2 shows a lens / mirror combination in a schematic representation, in which the levels E2, E3 and E4 serve for remote security. The plane E1 is used in conjunction with the mirror segments M1 to M5 and the Fresnel
Die Figur 3 zeigt den Strahlenverlauf des Bewegungsmelders gemäß Figur 1 nicht von der Seite wie in Figur 1, sondern von oben. Demgemäß sind hier die x- und die y-Achse eingezeichnet, während die z-Achse im Raum vertikal verläuft und senkrecht zur Zeichenebene liegt. In der Figur 3 ist zusätzlich noch der Winkel der einfallenden Strahlung gegenüber der y-Achse ay eingezeichnet.FIG. 3 shows the beam path of the motion detector according to FIG. 1 not from the side as in FIG. 1, but from above. Accordingly, the x and y axes are shown here, while the z axis runs vertically in space and is perpendicular to the plane of the drawing. The angle of the incident radiation with respect to the y-axis ay is also shown in FIG.
Der von einem Objekt ausgehende Strahl trifft parallel zur x-Achse auf den Spiegel 2 auf (180°-Erfassungswinkel) und wird von diesem so auf die Fresnellinse 3 abgelenkt, daß er unter dem Winkel ay auf dem Infrarotdetektor 1 auftrifft. Der Winkel ay darf nicht größer sein als der halbe Blickwinkel der Fresnellinse 3. Durch Variation des Anstellwinkels εx kann der Erfassungswinkel der Unsen/Spiegel-Kombination beliebig eingestellt werden.The beam emanating from an object strikes the
Die Figur 4 verdeutlicht die Reichweiten der einzelnen Ebenen E1 bis E4 gemäß Figur 2. Die Linsen-Spiegelkombination ist dabei mit 2,3 bezeichnet. Auch aus der Figur 4 geht hervor, daß bis zu einem Abstand von etwa 0,4 m von der Vertikalen des Bewegungsmelders eine Erfassung der von einem Objekt ausgehenden Infrarotstrahlung gewährleistet ist.FIG. 4 illustrates the ranges of the individual planes E1 to E4 according to FIG. 2. The lens-mirror combination is designated by 2.3. FIG. 4 also shows that up to a distance of approximately 0.4 m from the vertical of the motion detector, detection of the infrared radiation emanating from an object is ensured.
In der Figur 5 ist die Unterteilung des Blickfeldes der Ebenen E2, E3 und E4 in einer Ansicht von oben dargestellt. Der Winkel 26° ist dabei 5mal, der Winkel 18,6° 7mal, der Winkel 7,8° 31 mal und der Winkel 11,8° 11 mal vorhanden.5 shows the subdivision of the field of vision of the planes E2, E3 and E4 in a view from above. The angle 26 ° is 5 times, the angle 18.6 ° 7 times, the angle 7.8 ° 31 times and the angle 11.8 ° 11 times.
Schließlich zeigt die Figur 6 die Erfassungszonen des auf 180°-Blickwinkel erweiterten Unterkriechschutzes, der in der Ebene E1 verwirklicht ist.Finally, FIG. 6 shows the detection zones of the anti-creep protection extended to a 180 ° viewing angle, which is implemented in plane E1.
Claims (1)
- Infrared movement detector, having an infrared detector (1) with an optical system (2, 3, M1 to M5) arranged before it, in the beam direction, for concentrating the infrared radiation on the detector (1), in which the optical system (2, 3, M1 to M5) is made up of a mirror arrangement with a lens arrangement (3) after it, in the beam direction, and before the detector (1), characterised in that the mirror arrangement consists of several flat mirror segments (M1 to M5) which are arranged side-by-side for monitoring the crawl-under protection level (E1), and in that a common Fresnel lens (3) and a common detector (1) are present for all the flat mirror segments (M1 to M5).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3531333 | 1985-09-02 | ||
DE3531333 | 1985-09-02 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0218055A1 EP0218055A1 (en) | 1987-04-15 |
EP0218055B1 true EP0218055B1 (en) | 1989-11-08 |
Family
ID=6279958
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP86111436A Expired EP0218055B1 (en) | 1985-09-02 | 1986-08-19 | Infrared movement detector |
Country Status (4)
Country | Link |
---|---|
US (1) | US4752769A (en) |
EP (1) | EP0218055B1 (en) |
JP (1) | JPS6251482U (en) |
DE (1) | DE3666887D1 (en) |
Families Citing this family (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2614984A1 (en) * | 1987-05-05 | 1988-11-10 | Argamakoff Aleksy | Automatic forest fire detector |
US4841284A (en) * | 1987-10-19 | 1989-06-20 | C & K Systems, Inc. | Infrared intrusion detection system incorporating a fresnel lens and a mirror |
CH676642A5 (en) * | 1988-09-22 | 1991-02-15 | Cerberus Ag | |
US5066855A (en) * | 1990-01-24 | 1991-11-19 | Intelectron | Infrared intrusion detector |
US5200624A (en) * | 1991-09-09 | 1993-04-06 | Pittway Corporation | Wide-angle radiant energy detector |
US5393978A (en) * | 1993-02-04 | 1995-02-28 | Schwarz; Frank | Infrared detectors having front and rear fields of view |
US5418368A (en) * | 1993-10-05 | 1995-05-23 | Intelectron Products Company | Wide-angle motion detector with close-in reflector |
US5453622A (en) * | 1993-10-05 | 1995-09-26 | Larry C. Y. Lee | Wide-angle motion detector with close-in, prismoidal reflector |
US5414255A (en) * | 1993-11-08 | 1995-05-09 | Scantronic Limited | Intrusion detector having a generally planar fresnel lens provided on a planar mirror surface |
GB2286042B (en) * | 1994-01-27 | 1998-07-29 | Security Enclosures Ltd | Wide-angle infra-red detection apparatus |
US5662411A (en) * | 1995-03-20 | 1997-09-02 | Regent Lighting Corporation | Motion activated light fixture with fixed sensor |
US5764146A (en) * | 1995-03-29 | 1998-06-09 | Hubbell Incorporated | Multifunction occupancy sensor |
US5693943A (en) * | 1996-05-02 | 1997-12-02 | Visionic Ltd. | Passive infrared intrusion detector |
CA2196014C (en) * | 1997-01-27 | 2001-05-08 | Reinhart Karl Pildner | Size discriminating dual element pir detector |
AU729608B2 (en) * | 1997-01-27 | 2001-02-08 | Tyco Safety Products Canada Ltd | Size discriminating dual element pir detector |
IL127407A (en) * | 1998-12-06 | 2004-07-25 | Electronics Line E L Ltd | Infrared intrusion detector and method |
CA2300644C (en) * | 2000-03-10 | 2009-07-14 | Digital Security Controls Ltd. | Pet resistant pir detector |
JP2002365131A (en) * | 2001-05-24 | 2002-12-18 | Interquartz Malaysia Bhd Representative Office | Wide-range detector, and method of widening detection range |
TWI259980B (en) | 2003-09-01 | 2006-08-11 | Primax Electronics Ltd | Method and apparatus for real-time determining compatibility of an optical mouse with respect to a working surface |
US7375313B2 (en) | 2003-11-29 | 2008-05-20 | Eml Technologies Llc | Aimable motion-activated lighting fixture with angulated field |
JP4214523B2 (en) * | 2004-02-27 | 2009-01-28 | オプテックス株式会社 | Passive infrared sensor |
US20130043396A1 (en) * | 2011-08-19 | 2013-02-21 | Ninve Jr. Inc. | Motion detector with hybrid lens |
GB2509884B (en) | 2011-11-16 | 2018-10-17 | Tyco Fire & Security Gmbh | Motion detection systems and methodologies |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3631434A (en) * | 1969-10-08 | 1971-12-28 | Barnes Eng Co | Passive intrusion detector |
US3703718A (en) * | 1971-01-07 | 1972-11-21 | Optical Coating Laboratory Inc | Infrared intrusion detector system |
US3766539A (en) * | 1972-05-01 | 1973-10-16 | Us Army | Automatic personnel intrusion alarm |
US4321594A (en) * | 1979-11-01 | 1982-03-23 | American District Telegraph Company | Passive infrared detector |
CH650604A5 (en) * | 1980-10-24 | 1985-07-31 | Cerberus Ag | OPTICAL ARRANGEMENT FOR AN INFRARED BURGLAR DETECTOR. |
DE3235250C3 (en) * | 1982-09-23 | 1996-04-25 | Maul & Partner Gmbh Wirtschaft | Faceted optics for detecting radiation from a large solid angle, especially for motion detectors |
JPS59228136A (en) * | 1983-06-10 | 1984-12-21 | King Tsushin Kogyo Kk | Passive type infrared ray intrusion detector |
US4588988A (en) * | 1984-06-06 | 1986-05-13 | The United States Of America As Represented By The Secretary Of The Air Force | Intrusion barrier and detection apparatus |
-
1986
- 1986-08-19 EP EP86111436A patent/EP0218055B1/en not_active Expired
- 1986-08-19 DE DE8686111436T patent/DE3666887D1/en not_active Expired
- 1986-08-27 JP JP1986131068U patent/JPS6251482U/ja active Pending
- 1986-09-02 US US06/903,026 patent/US4752769A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE3666887D1 (en) | 1989-12-14 |
JPS6251482U (en) | 1987-03-31 |
EP0218055A1 (en) | 1987-04-15 |
US4752769A (en) | 1988-06-21 |
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