EP0408980A2 - Passive infrared movement detector with angular resolution - Google Patents
Passive infrared movement detector with angular resolution Download PDFInfo
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- EP0408980A2 EP0408980A2 EP90112705A EP90112705A EP0408980A2 EP 0408980 A2 EP0408980 A2 EP 0408980A2 EP 90112705 A EP90112705 A EP 90112705A EP 90112705 A EP90112705 A EP 90112705A EP 0408980 A2 EP0408980 A2 EP 0408980A2
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- angle
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- motion detector
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- 230000003287 optical effect Effects 0.000 claims abstract description 17
- 238000011156 evaluation Methods 0.000 claims abstract description 11
- 239000007787 solid Substances 0.000 claims abstract description 10
- 230000010355 oscillation Effects 0.000 claims abstract description 7
- 230000005855 radiation Effects 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 claims description 4
- 238000001514 detection method Methods 0.000 abstract description 8
- 239000002033 PVDF binder Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
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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
- 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 an angle-resolving passive infrared motion detector for room monitoring with at least one infrared sensor arranged in the focal point area of an optical means, which emits a signal as a function of a heat source, which signal is processed in a downstream evaluation device.
- the ultrasonic detector is an active detector, which in principle is a real motion detector because it detects objects that are actually moving in the room.
- the infrared motion detector is generally a passive detector that reacts to changes in the infrared structure of its surroundings.
- this property also makes it disadvantageously sensitive to changes in temperature which are not due to actual movement.
- radiators, buried heating pipes, incandescent lamps, etc. can erroneously trigger the infrared motion detector due to their change in heat.
- Conventional infrared motion detectors act almost exclusively in the form of a radiation into the room to be monitored.
- any stationary heat sources that act as interferers can be suppressed by aligning the insensitive areas with these interferers.
- a pyrodetector preferably suitable for motion and direction selective detection, is known.
- an angle-selective infrared detector is described which has a PVDF film with a number of IR sensor elements which are attached in the focal plane of a spherical or a spherical-parabolic mirror. Through this mirror optics, a corresponding lobe (radiation finger) or radiation “curtain” is assigned to each individual infrared sensor element in the detection area, so that an angle-selective detection of an infrared radiation source (heat source) is possible.
- the object of the invention is to provide an infrared motion detector which can detect a large number of narrowly defined, ie narrow, solid angles and one for each of these solid angles It can emit a signal if there is a heat source in this solid angle.
- an infrared motion detector described in the introduction in that only one infrared sensor is arranged, that the optical means is a parabolic mirror which is rotatably mounted about the focal point axis which is perpendicular to the optical axis, whereby for the infrared sensor a plurality of narrow-angle room segments are formed and the respective angular position can be determined, and that the evaluation device emits an alarm signal when a heat source moving through several room segments is detected.
- the infrared motion detector With the infrared motion detector according to the invention, a large number of room segments which have a very narrow angle are monitored for a moving heat source. In this way, a large number of horizontal pixels can be obtained, which enable a fine resolution of the space to be monitored and thus ensure reliable detection of a moving heat source or an intruder.
- the mirror can be mounted with tensioning straps and excited to the natural resonance oscillation.
- the respective angular position can be determined with a microcomputer for a predetermined number of spatial segments, so that the respective signal emitted by the infrared sensor is assigned to a specific spatial segment.
- several infrared sensors can advantageously be arranged next to one another in the focal point area, which are made of are directed that an infrared sensor receives the reflected infrared radiation optimally for certain angular ranges of the mirror.
- the infrared sensors are electrically connected.
- the infrared motion detector can be designed with a parabolic mirror and an infrared transmitter arranged in the focal point of the same such that the infrared sensor and the mirror oscillate and together about an axis that is perpendicular to the optical axis monitors a predetermined total solid angle.
- the respective angular position of the total angle and of the oscillation frequency and of the predefined number of room segments is likewise determined by a microcomputer, the evaluation device emitting an alarm signal in the case of a heat source moving through several room segments.
- the passive infrared motion detector is designed with its optical means so that the spatial representation of the focal point area is formed by a focal line, and that a plurality of infrared receivers are arranged on the focal line, each of which has a respective room segment assigned.
- the infrared receivers are formed by the CCD image converter, the signals of which are processed in the evaluation device with the aid of a microcomputer, the movement of a heat source through several room segments causing the alarm to be triggered.
- the optical means can be formed by a parabolic mirror or by a corresponding lens.
- two angle-resolving infrared motion detectors according to the invention are arranged at a certain distance from one another and are aligned with a common monitoring area. This is done by Triangulation of the location and the direction of movement of the heat source or intruder is calculated and an alarm is given depending on the course of movement.
- the distance between the two angle-resolving infrared motion detectors can be relatively small, it does not have to be the distance of a room width of, for example, 3 or 4 m, it can also be in the range from 30 cm to 1 m, because the very detailed high angular resolution in this Arrangement allows an exact location of the heat source.
Abstract
Description
Die Erfindung bezieht sich auf einen winkelauflösende passiven Infrarot-Bewegungsmelder zur Raumüberwachung mit zumindest einem im Brennpunktbereich eines optischen Mittels angeordneten Infrarot-Sensor, der in Abhängigkeit von einer Wärmequelle ein Signal abgibt, das in einer nachgeschalteten Auswerteeinrichtung verarbeitet wird.The invention relates to an angle-resolving passive infrared motion detector for room monitoring with at least one infrared sensor arranged in the focal point area of an optical means, which emits a signal as a function of a heat source, which signal is processed in a downstream evaluation device.
Aus der Bewegungsmelder unterschiedlichster Art werden heute in modernen Einbruchmeldeanlagen verwendet. Es werden sowohl Infrarot-, als auch Ultraschallmelder eingesetzt. Der Ultraschallmelder ist ein aktiver Melder, der prinzipiell ein echter Bewegungsmelder ist, weil er Gegenstände detektiert, die sich im Raum tatsächlich bewegen. Der Infrarot-Bewegungsmelder ist im allgemeinen ein passiver Melder, der auf Änderungen im Infrarot-Strukturbild seiner Umgebung reagiert. Diese Eigenschaft macht ihn jedoch in nachteiliger Weise auch auf Temperaturänderungen empfindlich, die nicht von einer tatsächlichen Bewegung herruhren. So können z.B. Heizkörper, unter Putz verlegte Heizungsrohre, Glühlampen usw. durch ihre Wärmeänderung den Infrarot-Bewegungsmelder fälschlicherweise auslösen. Herkömmliche Infrarot-Bewegungsmelder wirken praktisch ausschließlich strahlenförmig in den zu überwachenden Raum hinein. Durch geschicktes Ausrichten des Melders lassen sich etwaige stationäre Warmequellen, die als Störer wirken, unterdrücken, indem die unempfindlichen Bereiche auf diese Störer ausgerichtet sind. Das setzt jedoch voraus, daß das zu überwachende Objekt dies einerseits zuläßt, und daß andererseits die Störquellen bekannt sind.Various types of motion detectors are used in modern intrusion detection systems today. Both infrared and ultrasonic detectors are used. The ultrasonic detector is an active detector, which in principle is a real motion detector because it detects objects that are actually moving in the room. The infrared motion detector is generally a passive detector that reacts to changes in the infrared structure of its surroundings. However, this property also makes it disadvantageously sensitive to changes in temperature which are not due to actual movement. For example, radiators, buried heating pipes, incandescent lamps, etc. can erroneously trigger the infrared motion detector due to their change in heat. Conventional infrared motion detectors act almost exclusively in the form of a radiation into the room to be monitored. By cleverly aligning the detector, any stationary heat sources that act as interferers can be suppressed by aligning the insensitive areas with these interferers. However, this presupposes that the object to be monitored allows this on the one hand and that the sources of interference are known on the other hand.
Es ist auch bekannt, um die Nachteile von Infrarot- und Ultraschallmeldern auszuschalten und die Vorteile wirkungsvoll zur Geltung zu bringen, Infrarotmelder und Ultraschallmelder miteinander zu kombinieren und über eine logische UND-Schaltung zu verknüpfen (DE-OS 36 28 817). Hierbei können die jeweiligen Systemschwächen kompensiert werden. Jedoch sind derartige Melderkombinationen wesentlich teuerer und aufwendiger. Will man aus Konkurrenzgründen billigere Melderkombinationen einsetzen, so sind sie im allgemeinen mit sehr einfachen Sensoren und Auswerteeinheiten ausgerüstet, was zur Folge hat, daß häufig die Sabotagesicherheit gefährdet ist.It is also known to eliminate the disadvantages of infrared and ultrasonic detectors and to bring out the advantages effectively, to combine infrared detectors and ultrasonic detectors and to link them via a logical AND circuit (DE-OS 36 28 817). The respective system weaknesses can be compensated for here. However, such detector combinations are much more expensive and complex. If you want to use cheaper detector combinations for reasons of competition, they are generally equipped with very simple sensors and evaluation units, which means that security against sabotage is often at risk.
Aus der DE-OS 36 16 374 ist ein Pyrodetektor, vorzugsweise geeignet für bewegungs- und richtungsselektives Detektieren, bekannt. Dort ist ein winkelselektiver Infrarot-Detektor beschrieben, der eine PVDF-Folie mit einer Reihe von IR-Sensorelementen aufweist, die in der Brennebene eines sphärischen bzw. eines sphärisch-parabolischen Spiegels angebracht sind. Durch diese Spiegeloptik wird jedem einzelnen Infrarot-Sensorelement eine entsprechende Keule (Strahlenfinger) oder Strahlen"vorhang" im Erfassungsbereich zugewiesen, so daß eine winkelselektive Detektion einer Infrarot-Strahlenquelle (Wärmequelle) moglich ist. Es können auf diese Weise vier oder acht, also eine beschränkte Anzahl, voneinander unabhängige Erfassungskeulen gebildet werden, die einen bestimmten Raumwinkel erfassen, dem jeweils ein Infrarotbildpunkt entspricht. Hiermit werden tatsächliche Bewegungen einer Wärmequelle erfaßt, die zur Alarmgabe führen. Stationäre Wärmequellen, wie Heizungen oder ähnliches, können dabei eliminiert werden. Eine sehr sichere und zuverlässige und auch großräumige Erfassung ist hierdurch nicht ohne weiteres möglich, weil nur eine kleine Anzahl von Raumwinkeln erfaßt werden können.From DE-OS 36 16 374 a pyrodetector, preferably suitable for motion and direction selective detection, is known. There, an angle-selective infrared detector is described which has a PVDF film with a number of IR sensor elements which are attached in the focal plane of a spherical or a spherical-parabolic mirror. Through this mirror optics, a corresponding lobe (radiation finger) or radiation "curtain" is assigned to each individual infrared sensor element in the detection area, so that an angle-selective detection of an infrared radiation source (heat source) is possible. In this way, four or eight, that is to say a limited number of, mutually independent detection lobes can be formed, which detect a specific solid angle to which an infrared image point corresponds in each case. This detects actual movements of a heat source that lead to an alarm. Stationary heat sources such as heaters or the like can be eliminated. A very safe and reliable and also large-scale detection is not easily possible as a result, because only a small number of solid angles can be detected.
Aufgabe der Erfindung ist es, einen Infrarot-Bewegungsmelder zu schaffen, der eine Vielzahl von eng begrenzten, d.h. schmalen Raumwinkeln erfassen kann und für jeden dieser Raumwinkel ein Signal abzugeben vermag, wenn in diesem Raumwinkel eine Wärmequelle vorhanden ist.The object of the invention is to provide an infrared motion detector which can detect a large number of narrowly defined, ie narrow, solid angles and one for each of these solid angles It can emit a signal if there is a heat source in this solid angle.
Diese Aufgabe wird erfindungsgemäß mit einem eingangs beschriebenen Infrarot-Bewegungsmelder dadurch gelöst, daß nur ein Infrarot-Sensor angeordnet ist, daß das optische Mittel ein parabolförmiger Spiegel ist, der um die Brennpunktachse, die senkrecht zur optischen Achse steht, drehbar gelagert ist, wobei für den Infrarot-Sensor eine Vielzahl von schmalwinkligen Raumsegmenten gebildet sind und die jeweilige Winkelstellung feststellbar ist, und daß die Auswerteeinrichtung bei der Detektion einer durch mehrere Raumsegmente sich bewegenden Wärmequelle ein Alarmsignal abgibt.This object is achieved with an infrared motion detector described in the introduction in that only one infrared sensor is arranged, that the optical means is a parabolic mirror which is rotatably mounted about the focal point axis which is perpendicular to the optical axis, whereby for the infrared sensor a plurality of narrow-angle room segments are formed and the respective angular position can be determined, and that the evaluation device emits an alarm signal when a heat source moving through several room segments is detected.
Mit dem erfindungsgemäßen Infrarot-Bewegungsmelder werden eine Vielzahl von Raumsegmenten, die einen sehr schmalen Winkel besitzen, auf eine sich bewegende Wärmequelle überwacht. Auf diese Weise kann eine hohe Anzahl horizontaler Bildpunkte gewonnen werden, die eine feine Auflösung des zu überwachenden Raumes ermöglichen und somit eine zuverlässige Detektion einer sich bewegenden Wärmequelle bzw. eines Eindringlings gewährleisten.With the infrared motion detector according to the invention, a large number of room segments which have a very narrow angle are monitored for a moving heat source. In this way, a large number of horizontal pixels can be obtained, which enable a fine resolution of the space to be monitored and thus ensure reliable detection of a moving heat source or an intruder.
In einer vorteilhaften Ausgestaltung der Erfindung kann der Spiegel mit Spannbändern gelagert sein und zur Eigenresonanzschwingung angeregt werden. Dabei kann in Abhängigkeit von dem zu überwachenden gesamten Raumwinkel und der Schwingfrequenz des Spiegels bei einer vorgegebenen Anzahl von Raumsegmenten die jeweilige Winkelstellung mit einem Mikrorechner ermittelt werden, so daß das jeweilige, vom Infrarot-Sensor abgegebene Signal, einem bestimmten Raumsegment zugeordnet ist. Um bei der Verwendung von Infrarot-Empfängern mit einer ebenen Oberfläche einen Abfall des Wirkungsgrades zu den Seiten hin zu vermeiden, können in vorteilhafter Weise im Brennpunktbereich mehrere Infrarot-Sensoren nebeneinander angeordnet sein, die so aus gerichtet sind, daß jeweils ein Infrarot-Sensor die reflektierten Infrarot-Strahlungen für bestimmte Winkelbereiche des Spiegels optimal empfängt. Dabei sind die Infrarot-Sensoren elektrisch zusammengeschaltet.In an advantageous embodiment of the invention, the mirror can be mounted with tensioning straps and excited to the natural resonance oscillation. Depending on the total solid angle to be monitored and the oscillation frequency of the mirror, the respective angular position can be determined with a microcomputer for a predetermined number of spatial segments, so that the respective signal emitted by the infrared sensor is assigned to a specific spatial segment. In order to avoid a drop in the efficiency towards the sides when using infrared receivers with a flat surface, several infrared sensors can advantageously be arranged next to one another in the focal point area, which are made of are directed that an infrared sensor receives the reflected infrared radiation optimally for certain angular ranges of the mirror. The infrared sensors are electrically connected.
In einer weiteren Ausgestaltung der Erfindung kann der Infrarot-Bewegungsmelder mit einem parabolförmigen Spiegel und einem im Brennpunkt desselben angeordneten Infrarot-Senders so ausgebildet sein, daß der Infrarot-Sensor und der Spiegel gemeinsam um eine Achse, die senkrecht zur optischen Achse steht, schwingt und einen vorgegebenen Gesamtraumwinkel überwacht. Dabei wird vom Gesamtwinkel und von der Schwingfrequenz und von der vorgegebenen Anzahl der Raumsegmente die jeweilige Winkelstellung ebenfalls von einem Mikrorechner ermittelt, wobei die Auswerteeinrichtung bei einer sich durch mehrere Raumsegmente bewegenden Wärmequelle ein Alarmsignal abgibt.In a further embodiment of the invention, the infrared motion detector can be designed with a parabolic mirror and an infrared transmitter arranged in the focal point of the same such that the infrared sensor and the mirror oscillate and together about an axis that is perpendicular to the optical axis monitors a predetermined total solid angle. The respective angular position of the total angle and of the oscillation frequency and of the predefined number of room segments is likewise determined by a microcomputer, the evaluation device emitting an alarm signal in the case of a heat source moving through several room segments.
In einer anderen vorteilhaften Ausgestaltung der Erfindung ist der passive Infrarot-Bewegungsmelder mit seinem optischen Mittel so ausgestaltet, daß Tür die Raumabbildung der Brennpunktbereich von einer Brennlinie gebildet ist, und daß auf der Brennlinie eine Vielzahl von Infrarot-Empfängern angeordnet ist, denen ein jeweiliges Raumsegment zugeordnet ist. Dabei sind die Infrarot-Empfänger von dem CCD-Bild-Wandler gebildet, dessen Signale in der Auswerteeinrichtung mit Hilfe eines Mikrorechners verarbeitet werden, wobei die Bewegung einer Wärmequelle durch mehrere Raumsegmente zur Alarmgabe führt. Hierbei kann das optische Mittel von einem parabolförmigen Spiegel oder von einer entsprechenden Linse gebildet sein.In another advantageous embodiment of the invention, the passive infrared motion detector is designed with its optical means so that the spatial representation of the focal point area is formed by a focal line, and that a plurality of infrared receivers are arranged on the focal line, each of which has a respective room segment assigned. The infrared receivers are formed by the CCD image converter, the signals of which are processed in the evaluation device with the aid of a microcomputer, the movement of a heat source through several room segments causing the alarm to be triggered. The optical means can be formed by a parabolic mirror or by a corresponding lens.
Da die eingangs beschriebenen erfindungsgemäßen Anordnungen eine radiale Bewegung eines Eindringlings nur schwer detektieren, sind in einer weiteren Ausgestaltung der Erfindung zwei erfindungsgemäße winkelauflösende Infrarot-Bewegungsmelder in einem bestimmten Abstand zueinander angeordnet und auf einen gemeinsamen Überwachungsbereich ausgerichtet. Dabei wird durch Triangulation der Ort und die Bewegungsrichtung der Wärmequelle bzw. des Eindringlings berechnet und in Abhängigkeit vom Bewegungsverlauf ein Alarm gegeben. Der Abstand der beiden winkelauflösenden Infrarot-Bewegungsmelder kann dabei verhältnismäßig klein sein, er muß nicht den Abstand einer Raumbreite von beispielsweise 3 oder 4 m aufweisen, er kann auch im Bereich von 30 cm bis 1 m liegen, weil die sehr detaillierte hohe Winkelauflösung bei dieser Anordnung eine genaue Ortsbestimmung der Wärmequelle ermöglicht.Since the arrangements according to the invention described at the outset hardly detect radial movement of an intruder, in a further embodiment of the invention two angle-resolving infrared motion detectors according to the invention are arranged at a certain distance from one another and are aligned with a common monitoring area. This is done by Triangulation of the location and the direction of movement of the heat source or intruder is calculated and an alarm is given depending on the course of movement. The distance between the two angle-resolving infrared motion detectors can be relatively small, it does not have to be the distance of a room width of, for example, 3 or 4 m, it can also be in the range from 30 cm to 1 m, because the very detailed high angular resolution in this Arrangement allows an exact location of the heat source.
Claims (8)
dadurch gekennzeichnet, daß nur ein Infrarot-Sensor angeordnet ist, daß das optische Mittel ein parabolförmiger Spiegel ist, der um die Brennpunktachse, die senkrecht zur optischen Achse steht, drehbar gelagert ist, wobei für den Infrarot-Sensor eine Vielzahl von schmalwinkligen Raumsegmenten gebildet ist und die jeweilige Winkelstellung feststellbar ist, und daß die Auswerteeinrichtung bei der Detektion einer durch mehrere Raumsegmente sich bewegenden Wärmequelle ein Alarmsignal abgibt.1. Angle-resolving passive infrared motion detector for room monitoring with at least one infrared sensor arranged in the focal point area of an optical means, which emits a signal as a function of a heat source (intruder), which is processed in a downstream evaluation device,
characterized in that only one infrared sensor is arranged, that the optical means is a parabolic mirror which is rotatably mounted about the focal point axis which is perpendicular to the optical axis, a large number of narrow-angle space segments being formed for the infrared sensor and the respective angular position can be determined, and that the evaluation device emits an alarm signal when a heat source moving through several room segments is detected.
dadurch gekennzeichnet, daß das optische Mittel von einem parabolförmigen Spiegel gebildet ist, daß der Infrarot-Sensor und der Spiegel gemeinsam um eine Achse die senkrecht zur optischen Achse steht, schwingen und einen vorgebbaren Gesamtraumwinkel überwachen, und daß hiervon und von der Schwingfrequenz und von der vorgegebenen Anzahl der Raumsegmente die jeweilige Winkelstellung mit einem Mikrorechner ermittelt wird, wobei die Auswerteeinrichtung bei einer sich durch mehrere Raumsegmente bewegenden Wärmequelle ein Alarmsignal abgibt.4. Angle-resolving passive infrared motion detector according to the preamble of claim 1,
characterized in that the optical means is formed by a parabolic mirror, that the infrared sensor and the mirror vibrate together about an axis which is perpendicular to the optical axis and monitor a predeterminable total solid angle, and that of this and of the oscillation frequency and of the predetermined number of room segments, the respective angular position is determined with a microcomputer, the evaluation device emitting an alarm signal when a heat source moves through several room segments.
dadurch gekennzeichnet, daß das optische Mittel so ausgebildet ist, daß für die Raumabbildung der Brennpunktbereich von einer Brennlinie gebildet ist, daß auf der Brennlinie eine Vielzahl von Infrarot-Empfängern angeordnet ist, denen ein jeweiliges Raumsegment zugeordnet ist, das die Infrarot-Empfänger von einem CCD-Bildwandler gebildet sind, dessen Signale in der Auswerteeinrichtung mit Hilfe eines Mikrorechners verarbeitet werden, wobei die Bewegung einer Wärmequelle durch mehrere Raumsegmente zur Alarmgabe führt.5. Angle-resolving passive infrared motion detector according to the preamble of claim 1,
characterized in that the optical means is designed such that the focal area is formed by a focal line for the spatial image, that a plurality of infrared receivers is arranged on the focal line, to which a respective space segment is assigned, which the infrared receiver of one CCD image converters are formed, the signals of which are processed in the evaluation device with the aid of a microcomputer, the movement of a heat source through several room segments leading to the alarm being given.
dadurch gekennzeichnet, daß das optische Mittel von einer Linse gebildet ist.7. Angle-resolving passive infrared motion detector according to one of the preceding claims,
characterized in that the optical means is formed by a lens.
dadurch gekennzeichnet, daß zwei derartige winkelauflösende Infrarot-Melder in einem bestimmten Abstand zueinander angeordnet und auf einem gemeinsamen Überwachungsbereich ausgerichtet sind, und daß durch Triangulation der Ort und die Bewegungsrichtung der Wärmequelle berechnet und in Abhängigkeit vom Bewegungsverlauf ein Alarm gegeben wird.8. Angle-resolving passive infrared motion detector according to one of the preceding claims,
characterized in that two such angle-resolving infrared detectors are arranged at a certain distance from one another and are aligned on a common monitoring area, and in that the location and the direction of movement of the heat source are calculated by triangulation and an alarm is given as a function of the movement profile.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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DE3923607 | 1989-07-17 | ||
DE3923607 | 1989-07-17 |
Publications (2)
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EP0408980A2 true EP0408980A2 (en) | 1991-01-23 |
EP0408980A3 EP0408980A3 (en) | 1993-01-07 |
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Application Number | Title | Priority Date | Filing Date |
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EP19900112705 Withdrawn EP0408980A3 (en) | 1989-07-17 | 1990-07-03 | Passive infrared movement detector with angular resolution |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
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WO1993018492A1 (en) * | 1992-03-09 | 1993-09-16 | The Commonwealth Of Australia | Infrared intrusion sensor |
DE19737761A1 (en) * | 1997-08-29 | 1999-03-04 | Abb Patent Gmbh | Motion and direction selective motion detector |
EP1296302A1 (en) * | 2001-09-20 | 2003-03-26 | Alma Mater Studiorum -Universita' di Bologna | Vehicle traffic monitoring system, central control unit, and method |
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EP0185485A2 (en) * | 1984-12-10 | 1986-06-25 | British Aerospace Public Limited Company | Surveillance systems |
EP0245842A1 (en) * | 1986-05-15 | 1987-11-19 | Siemens Aktiengesellschaft | Pyrodetector, especially suited for motion and direction-selective detection |
DE3642196A1 (en) * | 1986-12-10 | 1988-06-23 | Mel Mikro Elektronik Gmbh | Optoelectronic collision protection device for vehicles |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1993018492A1 (en) * | 1992-03-09 | 1993-09-16 | The Commonwealth Of Australia | Infrared intrusion sensor |
US5465080A (en) * | 1992-03-09 | 1995-11-07 | The Commonwealth Of Australia | Infrared intrusion sensor |
DE19737761A1 (en) * | 1997-08-29 | 1999-03-04 | Abb Patent Gmbh | Motion and direction selective motion detector |
EP1296302A1 (en) * | 2001-09-20 | 2003-03-26 | Alma Mater Studiorum -Universita' di Bologna | Vehicle traffic monitoring system, central control unit, and method |
Also Published As
Publication number | Publication date |
---|---|
EP0408980A3 (en) | 1993-01-07 |
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