EP0025983A2 - Arrangement to prevent false alarms by passive infrared-movement signallers - Google Patents
Arrangement to prevent false alarms by passive infrared-movement signallers Download PDFInfo
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- EP0025983A2 EP0025983A2 EP80105602A EP80105602A EP0025983A2 EP 0025983 A2 EP0025983 A2 EP 0025983A2 EP 80105602 A EP80105602 A EP 80105602A EP 80105602 A EP80105602 A EP 80105602A EP 0025983 A2 EP0025983 A2 EP 0025983A2
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- Prior art keywords
- infrared detector
- optical filter
- arrangement according
- metal plate
- radiation
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- 239000002184 metal Substances 0.000 claims abstract description 30
- 230000003287 optical effect Effects 0.000 claims abstract description 29
- 230000005855 radiation Effects 0.000 claims abstract description 23
- 230000005670 electromagnetic radiation Effects 0.000 claims abstract description 10
- 239000007787 solid Substances 0.000 claims abstract description 8
- 238000011156 evaluation Methods 0.000 claims description 6
- 230000035945 sensitivity Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000002452 interceptive effect Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000005357 flat glass Substances 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000009291 secondary effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 235000012431 wafers Nutrition 0.000 description 1
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Classifications
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
- G08B29/18—Prevention or correction of operating errors
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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
-
- 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
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- 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 arrangement according to the preamble of patent claim 1.
- DE-OS 27 34 157 Such an arrangement is known and described for example in DE-OS 27 34 157.
- the basis is a passive infrared motion detector known from DE-AS 21 03 909, for example.
- changes from incident heat radiation are converted into electrical signals.
- Radiation in the wavelength range above about 4.5 ⁇ m is used.
- DE-OS 27 34 157 takes into account the fact that electromagnetic radiation with a wavelength below approximately 4.5 ⁇ m, that is to say below the infrared useful range, is prevented by an appropriate optical filter from the infrared detector, but that radiation absorbed, ie absorbed by this filter, heats the filter itself and can cause false alarms via the self-heat radiation of the filter generated thereby, the infrared detector with the evaluation device connected to it.
- window glass has the advantage that electromagnetic radiation with a wavelength above about 4.3 ⁇ m is absorbed and therefore infrared radiation from outside the monitored room does not interfere with the monitoring, but on the other hand allows electromagnetic radiation to pass below this range. This radiation can then trigger false alarms via the secondary effect of filter heating.
- the interfering light source has characteristic radiation changes, as is the case with moving car headlights. Their movements are in the area to which the evaluation device responds.
- DE-OS 27 34 157 To solve this problem, it is known from DE-OS 27 34 157 to provide existing focusing devices with additional filter effects and to keep unwanted radiation away from the actual optical filter either via selective absorption or selective reflection. A sufficiently strong filter effect, however, either cannot be achieved or can only be achieved with a high level of technical complexity, above all because of the large areas of the focusing elements.
- the present invention has for its object to prevent false alarms in another way, which is cheaper and better.
- the focusing elements should not only be used because of the high and relatively ineffective effort.
- the use of the motion detector protected against false alarms should also not depend on the focusing elements used.
- the invention does not take the path of filtering out the undesired radiation from the actual optical filter, but instead ensures by heat dissipation that the optical filter does not direct any interfering intrinsic radiation onto the infrared detector.
- the solid metal plate with its good thermal conductivity and large heat capacity, serves as a heat sink. The design effort is low.
- the metal plate with the optical filter and the infrared detector can be constructed as a single component, which is independent of the focusing elements used in its application.
- the heat sink not only has the function of removing heat from the optical filter. It also has the effect that changes in time of undesired incident radiation below the infrared range can be converted more slowly into heat radiation.
- the integrating effect of the heat sink causes characteristic radiation changes those outside the change range to which the motion detector responds. The sensitivity of the motion detector to glass-penetrating electromagnetic radiation is thus considerably reduced.
- the solid metal plate represents the bottom of a solid metal pot, within which the infrared detector is located. It is advantageous if the infrared detector is thermally insulated from the metal pot.
- the optical filter consists of a disk, the thickness of which has a ratio of at least 3: 8 to the diameter of the irradiated surface.
- the heat capacity of the optical filter also contributes to the fact that the rate of change of undesired incident radiation below the infrared range is converted into changing thermal radiation of the optical filter, the rate of change of which is slower than the detection range of the evaluation device.
- a solid metal screen is located on the optical filter on the side facing away from the infrared detector.
- External mirroring of the metal plate or the metal pot is also favorable. External radiation on the metal plate or on the metal pot can then cause no heating.
- an infrared detector 2 This is located in a housing 3 and is electrically connected to an evaluation device 4.
- the housing 3 is fastened in a solid metal pot 6 via a thermally insulating suspension 5.
- a thermally insulating suspension 5 In addition to a thick cylindrical wall, this has a thick bottom with a central cylindrical opening 7, the inner surface 8 of which is mirrored.
- An optical filter 9 in the form of a disk sits on the outside of the floor with good thermal conductivity and covers the opening 7.
- a further optical filter 11 sits on the inside of the floor via a thermally insulating spacer 10, similar to the optical filter 9 and also covering the opening 7.
- the focused electromagnetic radiation passes through the aperture 12, the optical filter 9 Opening 7 and through the optical filter 11 onto the infrared detector 2.
- the opening 7 with the mirrored wall surface acts as a light guide.
- the optical filters 9 and 11 are semiconductor wafers, for example made of germanium, which are vapor-deposited with interference layers. Their thickness is related to the diameter of the. irradiated area at least as 3: 8. Electromagnetic radiation, which is absorbed by the filter 9, generates heat there. This is both absorbed by the relatively high heat capacity of the filter disk due to the thickness and also derived via a thermally highly conductive connection to the screen 12 and the metal pot 6.
- the metal pot 6, as a heat sink, ensures that the filter surface can direct only minimal intrinsic heat radiation onto the infrared detector 2 via the opening 7. At least the high thermal absorption capacity of the metal pot 6 ensures that radiation changes are slowed down so significantly that their associated converted electrical signals no longer fall within the range to which the evaluation device 4 responds.
- An external mirror coating of the metal pot 6 reduces external influences by radiation on the metal pot 6 itself.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
- Radiation Pyrometers (AREA)
- Burglar Alarm Systems (AREA)
Abstract
Bei einem Infrarot-Bewegungsmelder wird zur Reduzierung der Empfindlichkeit gegenüber glasdurchdringender elektromagnetischer Strahlung vorgeschlagen, das vor dem Eingang des lnfrarot-Detektors (2) liegende optische Filter (9) mit einer Wärmesenke in Gestalt eines massiven Metalltopfes (6) zu verbinder. Änderungen von im optischen Filter (9) absorbierter Strahlung werden entweder in der Wärmesenke aufgefangen oder zumindest in der Eigenwärmestrahlung des optischen Filters (9) verlangsamt und fallen nicht mehr in den charakteristischen Änderungsbereich des Bewegungsmelders.In the case of an infrared motion detector, in order to reduce the sensitivity to glass-penetrating electromagnetic radiation, it is proposed to connect the optical filter (9) located in front of the input of the infrared detector (2) to a heat sink in the form of a solid metal pot (6). Changes in radiation absorbed in the optical filter (9) are either caught in the heat sink or at least slowed down in the inherent heat radiation of the optical filter (9) and no longer fall within the characteristic range of change of the motion detector.
Description
Die Erfindung betrifft eine Anordnung gemäß dem Oberbegriff des Patentanspruchs 1.The invention relates to an arrangement according to the preamble of
Eine solche Anordnung ist bekannt und beispielsweise in der DE-OS 27 34 157 beschrieben. Die Grundlage bildet ein beispielsweise aus der DE-AS 21 03 909 bekannter passiver Infrarot-Bewegungsmelder. In einem solchen werden Änderungen von auftreffender Wärmestrahlung in elektrische Signale umgesetzt. Ausgenutzt wird Strahlung im Wellenlängenbereich von oberhalb etwa 4,5 µm. In der DE-OS 27 34 157 ist der Tatsache Rechnung getragen, daß zwar elektromagnetische Strahlung mit einer Wellenlänge unterhalb etwa 4,5 µm, also unterhalb des Infrarot-Nutzbereiches, durch ein entsprechendes optisches Filter vom Infrarot-Detektor abgehalten wird, daß aber die von diesem Filter abgehaltene d.h. absorbierte Strahlung das Filter selbst erwärmt und über die damit erzeugte Eigenwärmestrahlung des Filters-den Infrarot- - Detektor mit der daran angeschlossenen Auswerteinrichtung zu Fehlalarmen veranlassen kann. Vor allem kann dies der Fall sein, wenn starke Lichtquellen wie Autoscheinwerfer von außerhalb des vom Bewegungsmelder überwachten Raumes durch Fensterscheiben in den überwachten Raum einstrahlen. Fensterglas hat einerseits den Vorteil, daß elektromagnetische Strahlung mit einer Wellenlänge von oberhalb etwa 4,3 µm absorbiert wird und daß deshalb Infrarot-Strahlung von außerhalb des überwachten Raumes die Überwachung nicht stört, läßt aber andererseits elektromagnetische Strahlung unterhalb dieses Bereiches passieren. Diese Strahlung kann dann über den Sekundäreffekt der Filtererwärmung Fehlalarme auslösen. Insbesondere ist dies der Fall, wenn die störende Lichtquelle charakteristische Strahlungsänderungen hat, wie dies bei sich bewegenden Autoscheinwerfern der Fall ist. Deren Bewegungen liegen in dem Bereich, auf den die Auswerteinrichtung anspricht.Such an arrangement is known and described for example in DE-OS 27 34 157. The basis is a passive infrared motion detector known from DE-AS 21 03 909, for example. In such a case, changes from incident heat radiation are converted into electrical signals. Radiation in the wavelength range above about 4.5 µm is used. DE-OS 27 34 157 takes into account the fact that electromagnetic radiation with a wavelength below approximately 4.5 μm, that is to say below the infrared useful range, is prevented by an appropriate optical filter from the infrared detector, but that radiation absorbed, ie absorbed by this filter, heats the filter itself and can cause false alarms via the self-heat radiation of the filter generated thereby, the infrared detector with the evaluation device connected to it. Above all, this can be the case if strong light sources such as car headlights shine into the monitored room from outside the room monitored by the motion detector through window panes. On the one hand, window glass has the advantage that electromagnetic radiation with a wavelength above about 4.3 µm is absorbed and therefore infrared radiation from outside the monitored room does not interfere with the monitoring, but on the other hand allows electromagnetic radiation to pass below this range. This radiation can then trigger false alarms via the secondary effect of filter heating. In particular, this is the case if the interfering light source has characteristic radiation changes, as is the case with moving car headlights. Their movements are in the area to which the evaluation device responds.
Zur Lösung dieses Problems ist aus der genannten DE-OS 27 34 157 bekannt, bereits vorhandene Fokussiereinrichtungen mit zusätzlichen Filterwirkungen zu versehen und unerwünschte Strahlung vom eigentlichen optischen Filter entweder über selektive Absorption oder selektive Reflexion fernzuhalten. Eine ausreichend starke-Filterwirkung ist jedoch entweder nicht oder nur mit hohem technischen Aufwand zu erreichen, vor allem auch wegen der großen Flächen der Fokussierelemente.To solve this problem, it is known from DE-OS 27 34 157 to provide existing focusing devices with additional filter effects and to keep unwanted radiation away from the actual optical filter either via selective absorption or selective reflection. A sufficiently strong filter effect, however, either cannot be achieved or can only be achieved with a high level of technical complexity, above all because of the large areas of the focusing elements.
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, Fehlalarme auf anderem Wege zu verhindern, der billiger und besser ist. Die Fokussierelemente sollen nicht nur des hohen und verhältnismäßig ineffektiven Aufwandes wegen nicht verwendet werden. Die Anwendung des vor Fehlalarmen geschützten Bewegungsmelders soll auch nicht von den verwendeten Fokussierelementen abhängen.The present invention has for its object to prevent false alarms in another way, which is cheaper and better. The focusing elements should not only be used because of the high and relatively ineffective effort. The use of the motion detector protected against false alarms should also not depend on the focusing elements used.
Zur Lösung dieser Aufgabe werden bei einer Anordnung der eingangs genannten Art die Merkmale gemäß dem Kennzeichen des Patentanspruchs 1 vorgeschlagen.To achieve this object, the features according to the characterizing part of
Die Erfindung beschreitet nicht den Weg einer Ausfilterung der unerwünschten Strahlung vom eigentlichen, optischen Filter, sondern sorgt durch Wärmeabfuhr dafür, daß das optische Filter keine störende Eigenstrahlung auf den Infrarot-Detektor richtet. Die massive Metallplatte dient dabei mit ihrer guten Wärmeleitfähigkeit und großen Wärmekapazität als Wärmesenke. Der konstruktive Aufwand ist dabei gering. Darüber hinaus kann die Metallplatte mit dem optischen Filter und dem Infrarot-Detektor als einheitliches Bauelement konstruiert werden, das in seiner Anwendung unabhängig von den verwendeten Fokussierelementen ist. Die Wärmesenke hat nicht nur die Funktion der Abfuhr von Wärme aus dem optischen Filter. Sie hat auch die Wirkung, daß sich zeitliche Änderungen von unerwünschter einfallender Strahlung unterhalb des Infrarotbereiches langsamer in Wärmestrahlung umsetzen können. Die Wärmesenke versetzt durch integrierende Wirkung charakteristische Strahlungsänderungen in solche außerhalb des Änderungsbereiches, auf die der Bewegungsmelder anspricht. Die Empfindlichkeit des Bewegungsmelders auf glasdurchdringende elektromagnetische Strahlung ist damit erheblich reduziert.The invention does not take the path of filtering out the undesired radiation from the actual optical filter, but instead ensures by heat dissipation that the optical filter does not direct any interfering intrinsic radiation onto the infrared detector. The solid metal plate, with its good thermal conductivity and large heat capacity, serves as a heat sink. The design effort is low. In addition, the metal plate with the optical filter and the infrared detector can be constructed as a single component, which is independent of the focusing elements used in its application. The heat sink not only has the function of removing heat from the optical filter. It also has the effect that changes in time of undesired incident radiation below the infrared range can be converted more slowly into heat radiation. The integrating effect of the heat sink causes characteristic radiation changes those outside the change range to which the motion detector responds. The sensitivity of the motion detector to glass-penetrating electromagnetic radiation is thus considerably reduced.
In einer vorteilhaften Weiterbildung stellt die massive Metallplatte den Boden eines massiven Metalltopfes dar, innerhalb dessen sich der Infrarot-Detektor befindet. Dabei ist es günstig, wenn der Infrarot-Detektor thermisch isoliert ist gegen den Metalltopf.In an advantageous development, the solid metal plate represents the bottom of a solid metal pot, within which the infrared detector is located. It is advantageous if the infrared detector is thermally insulated from the metal pot.
Nach einer vorteilhaften Ausgestaltung besteht das optische Filter aus einer Scheibe, deren Dicke zum Durchmesser der bestrahlten Fläche ein Verhältnis von mindestens 3:8 hat. Damit trägt auch die Wärmekapazität des optischen Filters dazu bei, daß die Änderungsgeschwindigkeit unerwünschter einfallender Strahlung unterhalb des Infrarotbereiches in sich ändernde Wärmestrahlung des optischen Filters umsetzt, deren Änderungsgeschwindigkeit langsamer ist als der Erfassungsbereich der Auswerteinrichtung.According to an advantageous embodiment, the optical filter consists of a disk, the thickness of which has a ratio of at least 3: 8 to the diameter of the irradiated surface. The heat capacity of the optical filter also contributes to the fact that the rate of change of undesired incident radiation below the infrared range is converted into changing thermal radiation of the optical filter, the rate of change of which is slower than the detection range of the evaluation device.
Nach einer weiteren vorteilhaften Ausgestaltung befindet sich auf dem optischen Filter auf der dem Infrarot-Detektor abgewandten Seite eine massive metallene Blende. Diese bewirkt zum einen, daß nicht mehr von der Filteroberfläche bestrahlt wird als aus optischen Gründen nötig ist. Zum anderen hat sie ebenfalls die Wirkung einer Wärmesenke. Dies wird noch verstärkt, wenn sie eine wesentlich größere Ausdehnung hat als ihre Blendenöffnung.According to a further advantageous embodiment, a solid metal screen is located on the optical filter on the side facing away from the infrared detector. On the one hand, this means that no more of the filter surface is irradiated than is necessary for optical reasons. On the other hand, it also has the effect of a heat sink. This is exacerbated if it has a much larger dimension than its aperture.
Dann ist es noch von Vorteil, wenn sich zwischen der Metallplatte und dem Infrarot-Detektor ein weiteres optisches Filter befindet. Dieses zusätzliche Filter ist vorteilhafterweise thermisch von der Metallplatte isoliert.Then it is also advantageous if there is another optical filter between the metal plate and the infrared detector. This too additional filter is advantageously thermally isolated from the metal plate.
Günstig ist auch eine äußere Verspiegelung der Metallplatte bzw. des Metalltopfes. Äußere Einstrahlungen auf die Metallplatte bzw. auf den Metalltopf können dann keine Erwärmung verursachen.External mirroring of the metal plate or the metal pot is also favorable. External radiation on the metal plate or on the metal pot can then cause no heating.
In der Zeichnung ist ein Ausführungsbeispiel einer erfindungsgemäßen Anordnung dargestellt.In the drawing, an embodiment of an arrangement according to the invention is shown.
Mit 1 ist die elektromagnetische Strahlung bezeichnet, die auf einen Infrarot-Detektor 2 fokussiert ist. Dieser befindet sich in einem Gehäuse 3 und ist elektrisch mit einer Auswerteinrichtung 4 verbunden. Über eine thermisch isolierende Aufhängung 5 ist das Gehäuse 3 in einem massiven Metalltopf 6 befestigt. Dieser hat außer einer diken zylindrischen Wand einen dicken Boden mit einer zentralen zylindrischen Öffnung 7, deren Innenfläche 8 verspiegelt ist. Auf der Außenseite des Bodens sitzt thermisch gut leitend und die Öffnung 7 überdeckend ein optisches Filter 9 in Form einer Scheibe. Auf der Innenseite des Bodens sitzt-über eine thermisch isolierende Abstandshalterung 10 ein weiteres optisches Filter 11, gleichartig wie das optische Filter 9 und ebenfalls die Öffnung 7 überdeckend. Über dem optischen Filter 9 liegt auf der der Öffnung 7 abgekehrten Seite eine metallene Blende 12 mit zentraler Blendenöffnung und mit über die Scheibe des optischen Filters 9 radial hinausragender Ausdehnung.1 with the electromagnetic radiation is referred to, which is focused on an infrared detector 2. This is located in a housing 3 and is electrically connected to an evaluation device 4. The housing 3 is fastened in a
Die fokussierte elektromagnetische Strahlung gelangt durch die Blende 12, das optische Filter 9, die Öffnung 7 und durch das optische Filter 11 auf den Infrarot-Detektor 2. Die Öffnung 7 mit der verspiegelten Wandfläche wirkt dabei als Lichtleiter. Die optischen Filter 9 und 11 sind Halbleiterscheiben, beispielsweise aus Germanium, die mit Interferenzschichten bedampft sind. Ihre Dicke verhält sich zum Durchmesser der. bestrahlten Fläche mindestens wie 3:8. Elektromagnetische Strahlung, die vom Filter 9 absorbiert wird, erzeugt dort Wärme. Diese wird sowohl von der wegen der Dicke verhältnismäßig hohen Wärmekapazität der Filterscheibe aufgenommen als auch über thermisch gut leitende Verbindung auf die Blende 12 und den Metalltopf 6 abgeleitet. Vor allem auf der dem Infrarot-Detektor 2 zugewandten Seite des Filters 9 sorgt der Metalltopf 6 als Wärmesenke dafür, daß die Filterfläche über cer Öffnung 7 nur minimale Eigenwärmestrahlung auf den Infrarot-Detektor 2 richten kann. Zumindest sorgt die hohe thermische Aufnahmefähigkeit des Metalltopfes 6 dafür, daß Strahlungsänderungen so wesentlich verlangsamt werden, daß ihre zugehörigen umgesetzten elektrischen Signale nicht mehr in den Bereich fallen, auf den die Auswerteinrichtung 4 anspricht. Eine äußere Verspiegelung des Metalltopfes 6 reduziert äußere Einflüsse durch Strahlung auf den Metalltopf 6 selbst.The focused electromagnetic radiation passes through the
Claims (9)
gekennzeichnet durch folgende Merkmale:
characterized by the following features:
gekennzeichnet , daß die Metallplatte den Boden eines massiven Metalltopfes (6) darstellt, innerhalb dessen sich der Infrarot-Detektor (2) befindet.2. Arrangement according to claim 1, characterized
characterized in that the metal plate represents the bottom of a solid metal pot (6) within which the infrared detector (2) is located.
gekennzeichnet , daß der Infrarot-Detektor (2) thermisch isoliert ist gegen den Metalltopf (6).3. Arrangement according to claim 2, characterized
characterized in that the infrared detector (2) is thermally insulated from the metal pot (6).
dadurch gekennzeichnet , daß das optische Filter (9) aus einer Scheibe besteht, deren Dicke zum Durchmesser der bestrahlten Fläche ein Verhältnis von mindestens 3:8 hat.4. Arrangement according to one of claims 1 to 3,
characterized in that the optical filter (9) consists of a disc, the thickness of which has a ratio of at least 3: 8 to the diameter of the irradiated surface.
dadurch gekennzeichnet , daß sich auf dem optischen Filter (9) auf der dem Infrarot-Detektor (2) abgewandten Seite eine massive metallene Blende (12) befindet.5. Arrangement according to one of claims 1 to 4,
characterized in that on the optical filter (9) on the side facing away from the infrared detector (2) there is a massive metal screen (12).
gekennzeichnet , daß die massive metallene Blende (12) eine wesentlich größere Ausdehnung hat als die Blendenöffnung.6. Arrangement according to claim 5, characterized
characterized in that the massive metal screen (12) has a much greater extent than the aperture.
dadurch gekennzeichnet , daß sich zwischen der Metallplatte und dem Infrarot-Detektor (2) ein weiteres optisches Filter (11) befindet.7. Arrangement according to one of claims 1 to 6,
characterized in that there is a further optical filter (11) between the metal plate and the infrared detector (2).
gekennzeichnet , daß das weitere optische Filter (11) von der Metallplatte thermisch isoliert ist.8. Arrangement according to claim 7, d adurch
characterized in that the further optical filter (11) is thermally insulated from the metal plate.
dadurch gekennzeichnet , daß die Metallplatte bzw. der Metalltopf (6) auf der Außenseite verspiegelt ist.9. Arrangement according to one of claims 1 to 8,
characterized in that the metal plate or the metal pot (6) is mirrored on the outside.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2937923A DE2937923C2 (en) | 1979-09-19 | 1979-09-19 | Arrangement for preventing false alarms from a passive infrared motion detector |
| DE2937923 | 1979-09-19 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0025983A2 true EP0025983A2 (en) | 1981-04-01 |
| EP0025983A3 EP0025983A3 (en) | 1981-04-22 |
Family
ID=6081297
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP80105602A Withdrawn EP0025983A3 (en) | 1979-09-19 | 1980-09-18 | Arrangement to prevent false alarms by passive infrared-movement signallers |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US4307388A (en) |
| EP (1) | EP0025983A3 (en) |
| JP (1) | JPS5652791A (en) |
| BR (1) | BR8005968A (en) |
| DE (1) | DE2937923C2 (en) |
| GB (1) | GB2059056B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0270331A2 (en) * | 1986-12-01 | 1988-06-08 | LEGRAND ELECTRIC LIMITED (Reg. no. 2769820) | Occupancy detectors etc. |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU6594080A (en) * | 1980-01-19 | 1981-07-30 | W. Vinten Ltd. | Intruder alarm systems |
| SE432492B (en) * | 1983-02-18 | 1984-04-02 | Lars Stenmark | INFRARED SENSOR DETECTOR CONSISTING OF A PELTIER ELEMENT |
| US4620800A (en) * | 1984-03-08 | 1986-11-04 | Research Dynamics Incorporated | High level gamma radiation dosimeter |
| JPS6183871A (en) * | 1984-09-29 | 1986-04-28 | 株式会社クボタ | Water cooling cupola |
| JPH0619327B2 (en) * | 1988-03-10 | 1994-03-16 | 三洋電機株式会社 | Infrared gas concentration meter |
| US5055685A (en) * | 1989-12-01 | 1991-10-08 | Optex Co., Ltd. | Infrared detecting apparatus |
| DE4236618A1 (en) * | 1992-10-29 | 1994-05-05 | Hirschmann Richard Gmbh Co | False alarm prevention device for infrared movement detector - has processor which generates alarm control signal only with occurrence of signal from external light sensor, when path of electrical signals from infrared detector deviates from preset course |
| CH684717A5 (en) * | 1993-03-26 | 1994-11-30 | Cerberus Ag | A detector. |
| US5434413A (en) * | 1993-10-01 | 1995-07-18 | Texas Instruments Incorporated | Virtual cold shield and cold filter for infrared detector arrays |
| GB9805022D0 (en) * | 1998-03-11 | 1998-05-06 | Rds Electronics Limited | Passive infrared detectors and housings therefor |
| US20090020703A1 (en) * | 2007-07-17 | 2009-01-22 | Honeywell International, Inc | Optical filter for improved white light immunity in an intrusion detector |
| US9108782B2 (en) * | 2012-10-15 | 2015-08-18 | S.C. Johnson & Son, Inc. | Dispensing systems with improved sensing capabilities |
| US9449504B2 (en) | 2013-03-21 | 2016-09-20 | Microsoft Technology Licensing, Llc | Code sequence control of infrared blaster |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2278936A (en) * | 1939-04-25 | 1942-04-07 | American District Telegraph Co | Radiant energy receiving system |
| US3188830A (en) * | 1964-08-03 | 1965-06-15 | Hughes Aircraft Co | Thermal oscillation filter |
| DE2103909A1 (en) * | 1970-02-06 | 1971-08-19 | Optical Coaring Lab Inc | Monitoring device to determine the presence of an intruder in a room |
| DE2836462A1 (en) * | 1978-08-21 | 1980-03-06 | Woerl Alarm August Woerl Inhab | Room surveillance sensor system - uses optical lens assembly to focus IR emissions onto detector stage |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2734157A1 (en) * | 1958-02-22 | 1979-02-01 | Heimann Gmbh | PASSIVE INFRARED ALARM |
| US3703718A (en) * | 1971-01-07 | 1972-11-21 | Optical Coating Laboratory Inc | Infrared intrusion detector system |
| JPS49103690A (en) * | 1973-02-02 | 1974-10-01 |
-
1979
- 1979-09-19 DE DE2937923A patent/DE2937923C2/en not_active Expired
-
1980
- 1980-06-09 US US06/157,831 patent/US4307388A/en not_active Expired - Lifetime
- 1980-09-16 GB GB8029898A patent/GB2059056B/en not_active Expired
- 1980-09-18 JP JP13002780A patent/JPS5652791A/en active Pending
- 1980-09-18 EP EP80105602A patent/EP0025983A3/en not_active Withdrawn
- 1980-09-18 BR BR8005968A patent/BR8005968A/en unknown
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2278936A (en) * | 1939-04-25 | 1942-04-07 | American District Telegraph Co | Radiant energy receiving system |
| US3188830A (en) * | 1964-08-03 | 1965-06-15 | Hughes Aircraft Co | Thermal oscillation filter |
| DE2103909A1 (en) * | 1970-02-06 | 1971-08-19 | Optical Coaring Lab Inc | Monitoring device to determine the presence of an intruder in a room |
| FR2080963A1 (en) * | 1970-02-06 | 1971-11-26 | Optical Coating Laboratory Inc | |
| DE2836462A1 (en) * | 1978-08-21 | 1980-03-06 | Woerl Alarm August Woerl Inhab | Room surveillance sensor system - uses optical lens assembly to focus IR emissions onto detector stage |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0270331A2 (en) * | 1986-12-01 | 1988-06-08 | LEGRAND ELECTRIC LIMITED (Reg. no. 2769820) | Occupancy detectors etc. |
| EP0270331A3 (en) * | 1986-12-01 | 1989-12-13 | Floorplan Electrical Limited | Occupancy detectors etc. |
| EP0571052A1 (en) * | 1986-12-01 | 1993-11-24 | LEGRAND ELECTRIC LIMITED (Reg. no. 2769820) | Occupancy detectors etc. |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5652791A (en) | 1981-05-12 |
| DE2937923A1 (en) | 1981-06-11 |
| US4307388A (en) | 1981-12-22 |
| GB2059056B (en) | 1983-08-24 |
| DE2937923C2 (en) | 1984-05-24 |
| EP0025983A3 (en) | 1981-04-22 |
| BR8005968A (en) | 1981-03-31 |
| GB2059056A (en) | 1981-04-15 |
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Legal Events
| Date | Code | Title | Description |
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| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| PUAL | Search report despatched |
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| AK | Designated contracting states |
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| AK | Designated contracting states |
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| 17P | Request for examination filed |
Effective date: 19811022 |
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| 18D | Application deemed to be withdrawn |
Effective date: 19830712 |
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| RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: DOENGES, GERHARD, DIPL.-ING. Inventor name: HERWIG, THOMAS, DIPL.-PHYS. |