EP0250746A2 - Détecteur de mouvement passif à infrarouge - Google Patents

Détecteur de mouvement passif à infrarouge Download PDF

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Publication number
EP0250746A2
EP0250746A2 EP87105733A EP87105733A EP0250746A2 EP 0250746 A2 EP0250746 A2 EP 0250746A2 EP 87105733 A EP87105733 A EP 87105733A EP 87105733 A EP87105733 A EP 87105733A EP 0250746 A2 EP0250746 A2 EP 0250746A2
Authority
EP
European Patent Office
Prior art keywords
distance
signal
zones
assigned
detector
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP87105733A
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German (de)
English (en)
Other versions
EP0250746B1 (fr
EP0250746A3 (en
Inventor
Joachim Willie
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.)
Fritz Fuss GmbH and Co
Original Assignee
Fritz Fuss GmbH and Co
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 Fritz Fuss GmbH and Co filed Critical Fritz Fuss GmbH and Co
Priority to AT87105733T priority Critical patent/ATE71756T1/de
Publication of EP0250746A2 publication Critical patent/EP0250746A2/fr
Publication of EP0250746A3 publication Critical patent/EP0250746A3/de
Application granted granted Critical
Publication of EP0250746B1 publication Critical patent/EP0250746B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/18—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
    • G08B13/189—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems
    • G08B13/19—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using infrared-radiation detection systems
    • G08B13/191—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 pyroelectric sensor means

Definitions

  • the invention relates to a method for detecting an object which has entered the measuring field of a passive infrared motion detector (PIR motion detector), in which the amplitude, the polarity sequence and the time sequence of the output signal of a radiation detector are evaluated for corresponding reference values.
  • PIR motion detector passive infrared motion detector
  • the invention also relates to a device for performing the method.
  • Such PIR motion detectors are known to be used in hazard detection technology, in particular in intrusion protection technology, and in control technology for detecting moving objects indoors.
  • the infrared radiation (IR radiation) emitted by a human body or by another heat source is bundled by mirror optics and fed to a pyro element.
  • IR radiation infrared radiation
  • the well-known PIR motion detectors are designed to detect and evaluate dynamic changes. So that a message signal is generated, it is necessary that the object both penetrates into the measuring field and exits the measuring field again.
  • known evaluation methods can be designed to emit a corresponding detection signal only after a frequency of preselectable detection processes, for example a plurality of measuring field entries and exits. The sensor output signals generated by the entries and exits are compared with respect to their amplitudes and their number or polarity with predetermined reference values and predetermined polarity sequences and time sequences.
  • the invention is based on the object of specifying a method of the type mentioned at the beginning with which the dwell of an object within the measuring field can also be recognized and evaluated. Furthermore, the invention is based on the object of specifying a device for carrying out the method.
  • the object is achieved in that the measuring field is divided into at least two different distance zones with respect to the PIR detector, within which the ratio of the object size to the measuring field is different, and in that each distance zone is assigned individually set reference values for the respective distance zone will.
  • the object is achieved in that a selective amplifier is assigned to each distance zone and the output of each amplifier is connected to a comparator device for comparing the relevant output signal with an individually designed reference signal for the associated distance zone.
  • the invention takes advantage of the fact that after Radiation law changes the radiant power in the square of the distance. In relation to a certain object, a certain characteristic radiation power can therefore be assigned to each distance zone. Due to the generally conical shape of the measuring field, which depends on the optical device used, the time period between an entry and an exit of the measuring field is also different at two distance zones. The invention is therefore based on the idea of evaluating the measured variables characteristic of the individual distance zones in order to detect a transition of an object from one distance zone to the other. For example, the signal amplitude of a sensor is reduced by a quarter if the distance of the object from the sensor doubles. A movement of the object can therefore be concluded from the change in amplitude.
  • a preferred development of the method consists in that the amplitudes assigned to the distance zones are determined on the basis of reference objects which are brought into the distance zones. In this way, the signal amplitudes on which the evaluation is based can be determined precisely by measurement. It is also easily possible to distinguish and divide a subdivision into signal amplitudes that are based on movement and signal amplitudes that are caused by interference.
  • a further preferred development of the method according to the invention consists in that more than two distance zones are specified with an amplitude sequence assigned to the distance zones.
  • a subdivision can consist, for example, of providing a very close range in which the object is much larger than the measuring zone, a close range, a central range and a far range. The classification is made according to the specific detection requirements.
  • the individual distance zones can be assigned different, individual signal frequencies will.
  • This measure takes into account the fact that the usually conical measuring field increases with increasing distance from the sensor, so that the time for traversing increases correspondingly with increasing distance from the sensor.
  • a signal frequency corresponding to their diameter can therefore be assigned to those signals which indicate an entry and exit of an object into or out of the distance zone.
  • the penetration into the measuring field and a subsequent transition from one distance zone to another are evaluated as a criterion for an object detection. If, therefore, an object no longer emerges from the measuring zone, but moves in the radial direction with respect to the sensor, detection also takes place. It is therefore not necessary for the object to exit the measuring zone again.
  • a preferred development of the device for performing the method consists in that the outputs of all selective amplifiers are connected via a multiplexer to a threshold value comparator with a variable reference threshold, which can be controlled via a multiplexer in accordance with the input signal present.
  • the output of the threshold value comparator is preferably connected to a: first and second cross-connected timer in such a way that the first timer when a Threshold value is started and that an output signal can only be tapped at the first timing element if the second timing element has been activated within a predetermined time period by exceeding a negated threshold value.
  • Another preferred development of the arrangement consists in that the outputs of the selective amplifiers are connected to an interference signal detection unit with which the output signals are monitored for signal amplitudes which clearly differ from the signal amplitudes to be expected.
  • FIG. 1 illustrates purely schematically an area monitored by a PIR motion detector with a sensor 1.
  • Two measuring zones 20, 20 ′ are shown as examples, which are approximately conical. A different number of measuring zones can of course also be provided.
  • the infrared radiation from the two measuring zones 20, 20 ′ is focused onto the sensor 1 via an optical device (not shown). Any change in radiation In addition, an output voltage change occurs at sensor 1, which is evaluated in an arrangement described in the following figures.
  • the distances of the individual distance zones e1 to e5 as well as their lengths can basically be freely selected. However, it makes sense to make and coordinate the classification according to the specific detection requirements.
  • the radiation in the two measuring fields 20, 20 ' is bundled via the optical device onto the sensor 1 from radiation detectors 1, 1' pyro-electric, which are connected in antiparallel and which can also be referred to as dual sensors.
  • FIG. 1 also illustrates in a purely schematic manner the manner in which the relationship between the object size and the measurement field size changes in the individual distance zones e1 to e4.
  • a reference object 22 is shown in the measuring field 20 in each of the distance zones.
  • an object of the same size when entering or staying in the different distance zones, causes characteristic radiation changes which can be assigned to the individual distance zones. According to the radiation law, the radiation power is reduced by the square of the distance.
  • Fig. 1 illustrates that at the same speed the time period for crossing the measuring fields in the individual distance zones e1 to e4 is different at the same speed in the individual distance zones e1 to e4. The determination of this time period can be determined on the basis of an entrance amplitude and an exit amplitude at the outputs of the two detectors 1, 1 '.
  • FIG. 2 illustrates a first example of an evaluation unit with which the output signals of the two radiation detectors 1, 1 'are evaluated.
  • evaluation branches I, I ' for both radiation detectors 1, 1'. They each consist of a series connection of selective amplifiers 2, 4, 6 or 2 ', 4', 6 '. The number corresponds to the number of distance zones e1 to e4. With, for example, four distance zones, four selective amplifiers are also connected in series. The output signals of the individual selective amplifiers are forwarded to the following stage via differentiators 3, 5, 7 or 3 ', 5', 7 '.
  • the evaluation circuit can be designed for a predetermined sensitivity with regard to a certain monitoring volume.
  • the radiation changes during the transition from one distance zone to the other are evaluated by assigning a selective amplifier to each distance zone e1 to e and the amplitude of the respective output signal with reference. amplitudes are compared. The assignment and subdivision takes place speaking of the expected useful signal amplitudes in the distance ranges e1 to e n .
  • the respective output signal E1 to E n of an amplifier 2, 4, 6 of the evaluation branch I is fed via an analog multiplexer 8 to a threshold value comparator 9 with a variable reference voltage, which likewise via a further analog multiplexer 12 in association with the input signal just present can be interpreted as changeable.
  • timing element 10 or 11 When a threshold value is exceeded, one of two timing elements 10 or 11 is triggered, which only emits an output signal if the other negated tent element is activated within a predetermined period of time. Depending on whether a positive or negative reference threshold is exceeded (reference voltage U + or reference voltage U-), a corresponding output signal A + or A - is output by the relevant timing element 10, 11.
  • the two analog multiplexers 8, 12 are controlled via a clock signal ST, which is generated in a predetermined time pattern by a clock stage (not shown).
  • the second evaluation branch I ' is identical to the first evaluation branch I.
  • the output signals of the individual amplifiers 2 ', 3', 6 ' are tapped for comparison purposes and, like the output signals E1 to E n, are fed to an analog multiplexer (not shown).
  • the evaluation branch I ' can improve the evaluation as a whole depending on the sensor type and requirement.
  • the comparison levels V1 to V n are preferably determined by measurement by placing a reference object in the individual distance zones and measuring the characteristic output amplitudes of the associated selective amplifiers. In this way, an amplitude sequence adapted to the respective monitoring task can be determined and defined.
  • the determined maximum signal amplitudes at the outputs of the amplifiers can also be divided into signal amplitudes that originate from motion detection and signal amplitudes that are caused due to interference.
  • a logical evaluation unit (not shown) can be used in this way prevent a message from the motion detector that can be clearly assigned to influences from the store. With the help of the logic evaluation unit, not only the absence of a predetermined amplitude sequence, but also the absence of an entry / exit detection can be recognized and displayed if characteristic signal frequencies are assigned to the individual distance zones e1 to e.
  • a processor-controlled evaluation can be provided according to FIG. 3.
  • the output signals Se1 to Se of the selective amplifiers 2, 4, 6 of the first evaluation branch I are fed to a processor 19 which works with an A / D converter with multiplexed inputs and correspondingly multiplexed threshold value outputs (not shown).
  • a threshold value corresponding to the example described in FIG. 2 is exceeded , one of the counter stages 13 and 14 is activated depending on the polarity of the level U x + , U x - , and then one of the memory elements 15 and 14 is set, each of the two time counter stages 13 and 14 are connected downstream.
  • an output stage 18 for actuator control is activated with the aid of a logic combination stage 17, one of the corresponding alarm outputs A e1 to A en of the relevant distance stage e1 to e being activated.
  • FIG. 4 A second example for monitoring the distance zones e1 to e is illustrated in FIG. 4.
  • the arrangement is designed as an example for four distance levels e1 to e4. Accordingly, the radiation detector 1 is followed by a selective amplifier with four stages 41, 42, 43, 44.
  • the output signal of each amplifier 41 to 44 is fed to an evaluation unit 54, 55, 56 and 57, the circuit details of which are identical.
  • the evaluation unit is representative of all other evaluation units. Unit 57 at the output of amplifier 44 shown in detail.
  • the time delay activates an actuator B e4 via a block 13 if the corresponding negated signal amplitude does not appear within the time delay.
  • the actuator B e4 indicates that an object remains in the detection area.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
  • Radiation Pyrometers (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Studio Devices (AREA)
  • Burglar Alarm Systems (AREA)
EP87105733A 1986-07-03 1987-04-16 Détecteur de mouvement passif à infrarouge Expired - Lifetime EP0250746B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87105733T ATE71756T1 (de) 1986-07-03 1987-04-16 Passiver infrarot-bewegungsmelders.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3622371 1986-07-03
DE19863622371 DE3622371A1 (de) 1986-07-03 1986-07-03 Verfahren zum detektieren eines in das messfeld eines passiven infrarot-bewegungsmelders eingedrungenen objektes und vorrichtung zur durchfuehrung des verfahrens

Publications (3)

Publication Number Publication Date
EP0250746A2 true EP0250746A2 (fr) 1988-01-07
EP0250746A3 EP0250746A3 (en) 1988-10-19
EP0250746B1 EP0250746B1 (fr) 1992-01-15

Family

ID=6304323

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87105733A Expired - Lifetime EP0250746B1 (fr) 1986-07-03 1987-04-16 Détecteur de mouvement passif à infrarouge

Country Status (3)

Country Link
EP (1) EP0250746B1 (fr)
AT (1) ATE71756T1 (fr)
DE (2) DE3622371A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU615291B2 (en) * 1988-04-28 1991-09-26 Australian Electronic Securities Pty. Ltd. Controlled access system
GB2314410A (en) * 1996-06-18 1997-12-24 Siemens Plc Passive Infra-Red Detection System suitable for Traffic Control Systems
EP1387330A1 (fr) * 2002-08-02 2004-02-04 ABB PATENT GmbH Capteur de mouvement infrarouge passif
WO2011059830A2 (fr) * 2009-10-29 2011-05-19 Suren Systems, Inc. Capteur de mouvement infrarouge

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19548578C2 (de) * 1995-12-27 2001-02-08 Elbau Elektronik Bauelemente G Positionsselektiver passiver Infrarot-Intrusion-Sensor
DE19607608C2 (de) * 1996-02-29 2003-04-03 Abb Patent Gmbh Bewegungsmelder mit mindestens einem Dualsensor zur Detektion von Wärmestrahlung
CA3048649A1 (fr) * 2017-01-13 2018-07-19 The Research Foundation For The State University Of New York Appareil de capteur infrarouge passif hache et procede de detection d'occupant fixe et mobile

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2074314A (en) * 1980-04-08 1981-10-28 American District Telegraph Co Intrusion detection systems
EP0107042A1 (fr) * 1982-10-01 1984-05-02 Cerberus Ag Détecteur infra-rouge pour déterminer un intrus dans une zone

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH599642A5 (fr) * 1976-11-15 1978-05-31 Cerberus Ag
DE3128256A1 (de) * 1981-07-17 1983-02-03 Richard Hirschmann Radiotechnisches Werk, 7300 Esslingen Bewegungsmelder zur raumueberwachung
JPS59195179A (ja) * 1983-04-20 1984-11-06 Uro Denshi Kogyo Kk 侵入警報器

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2074314A (en) * 1980-04-08 1981-10-28 American District Telegraph Co Intrusion detection systems
EP0107042A1 (fr) * 1982-10-01 1984-05-02 Cerberus Ag Détecteur infra-rouge pour déterminer un intrus dans une zone

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU615291B2 (en) * 1988-04-28 1991-09-26 Australian Electronic Securities Pty. Ltd. Controlled access system
GB2314410A (en) * 1996-06-18 1997-12-24 Siemens Plc Passive Infra-Red Detection System suitable for Traffic Control Systems
US5892226A (en) * 1996-06-18 1999-04-06 Siemens Plc Traffic control systems
EP1387330A1 (fr) * 2002-08-02 2004-02-04 ABB PATENT GmbH Capteur de mouvement infrarouge passif
WO2011059830A2 (fr) * 2009-10-29 2011-05-19 Suren Systems, Inc. Capteur de mouvement infrarouge
WO2011059830A3 (fr) * 2009-10-29 2011-08-25 Suren Systems, Inc. Capteur de mouvement infrarouge
CN102713544A (zh) * 2009-10-29 2012-10-03 西荣科技有限公司 红外运动传感器
CN102713544B (zh) * 2009-10-29 2014-10-01 西荣科技有限公司 红外运动传感器
EP2494322A4 (fr) * 2009-10-29 2018-01-10 Suren Systems, Inc. Capteur de mouvement infrarouge

Also Published As

Publication number Publication date
DE3776001D1 (de) 1992-02-27
ATE71756T1 (de) 1992-02-15
DE3622371A1 (de) 1988-02-04
EP0250746B1 (fr) 1992-01-15
DE3622371C2 (fr) 1989-08-10
EP0250746A3 (en) 1988-10-19

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