EP0250746B1 - Passiver Infrarot-Bewegungsmelder - Google Patents

Passiver Infrarot-Bewegungsmelder Download PDF

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Publication number
EP0250746B1
EP0250746B1 EP87105733A EP87105733A EP0250746B1 EP 0250746 B1 EP0250746 B1 EP 0250746B1 EP 87105733 A EP87105733 A EP 87105733A EP 87105733 A EP87105733 A EP 87105733A EP 0250746 B1 EP0250746 B1 EP 0250746B1
Authority
EP
European Patent Office
Prior art keywords
signal
passive infrared
predetermined
movement indicator
zones
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP87105733A
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German (de)
English (en)
French (fr)
Other versions
EP0250746A3 (en
EP0250746A2 (de
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/de
Publication of EP0250746A3 publication Critical patent/EP0250746A3/de
Application granted granted Critical
Publication of EP0250746B1 publication Critical patent/EP0250746B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • G08B13/191—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 passive infrared motion detector as specified in the preamble of the main claim.
  • PIR P assiver I nfra R ot
  • IR radiation infrared radiation
  • a PIR motion detector Even the smallest changes in radiation flow, ie changes over time in the temperature difference between the ambient temperature and the respective surface temperature of the object, can be detected.
  • 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 output a corresponding detection signal only after a sequence of preselectable detection sequences, for example a plurality of measuring field entries and exits. The amplitude and number or polarity of the sensor output pulses generated by the entries and exits are compared with specified reference values and specified polarity sequences and time sequences.
  • a passive infrared motion detector according to the preamble of claim 1 is known from EP 107 042 A1. It has a first sensor, the output signal of which is evaluated according to two criteria. The evaluation takes place on the one hand according to the correlation with a stored reference signal and on the other hand according to a predetermined amplitude threshold value of the correlation result. Furthermore, the close range of the first sensor is monitored by a second sensor and the output signal of the second sensor is used as a reference for the output signal of the first sensor.
  • an infrared motion detector is known from EP 70 364 B1, which has a window discriminator with dynamic reference voltage. Both a positive and a negative signal pulse of a given amplitude occur within a given time interval. This voltage curve is characteristic of an entry and exit of a person in the surveillance area.
  • the invention has for its object to provide a passive infrared motion detector of the type mentioned, which is simplified in terms of circuitry and in which a technically complex correlation process can be dispensed with and nevertheless a reliable detection of the useful signal against noise takes place.
  • 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 approximately conical design of the measuring field, which depends on the optical device used, the time 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 decreases to a quarter when the distance of the object from the sensor doubles. A movement of the object can therefore be concluded from the change in amplitude.
  • the amplitudes assigned to the distance zones can be 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 measured precisely. It is also easily possible to subdivide into signal amplitudes that are based on movement and signal amplitudes that are caused by interference.
  • a preferred development of 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 near area in which the object is much larger than the measurement zone, a near area, a middle area and a far area. The classification is made according to the specific detection requirements.
  • the individual distance zones can be assigned different, individual signal intervals 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.
  • the individual distance zones can therefore be assigned a signal sequence corresponding to their diameter of those signals which indicate the entry and exit of an object into or out of the distance zone.
  • a preferred development is 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.
  • the outputs of the selective amplifiers are connected to an interference signal detection unit, with which the output signals are monitored for signal amplitudes that clearly differ from the expected signal amplitudes.
  • Fig. 1 shows purely schematically the formation of measuring fields of a PIR motion detector and their subdivision into distance zones.
  • Fig. 2 shows a block diagram of an arrangement for monitoring the distance zones acc. Fig. 1.
  • Fig. 3 shows an alternative of a circuit part of the arrangement according to. Fig. 2;
  • Fig. 4 shows an alternative arrangement for monitoring the distance zones acc. Fig. 1
  • FIG. 1 illustrates purely schematically an area monitored by a PIR motion detector with a sensor 1.
  • the infrared radiation of the two measuring zones 20, 20 ' is focused on the sensor 1 via an optical device, not shown. Any change in radiation incidence causes an output voltage change 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 on the sensor 1 from antiparallel connected, adjacent radiation detectors 1, 1' pyro-electric type, 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.
  • Fig. 1 illustrates that the time for traversing 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 interval 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 'there are separate evaluation branches I, I'. They each consist of a series connection of selective amplifiers 2, 4, 6 and 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 passed through differentiators 3, 5, 7 and 3 ', 5', 7 ', to the next stage. Through the series connection of the selective amplifiers and the differentiators, the evaluation circuit can be designed for a predetermined sensitivity with regard to a certain monitoring volume.
  • the radiation changes upon entry and exit into or from a distance zone are evaluated by assigning a selective amplifier to each distance zone e1 to e n and comparing the amplitude of the respective output signal with reference amplitudes will. The assignment and subdivision takes place accordingly the expected useful signal amplitudes in the distance ranges e1 to e n .
  • the respective output signal E 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 currently being applied 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 timing element is activated within a predetermined 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, similarly to the output signals E1 to E n, are fed to an analog multiplexer (not shown).
  • the evaluation branch I ' can improve the evaluation overall 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 interference. With the aid of the logic evaluation not only the absence of a predetermined amplitude sequence but also the absence of an entry / exit detection can be detected and displayed, if the individual distance zones are assigned to e n e1 characteristic signal frequencies.
  • a processor-controlled evaluation can be provided according to FIG. 3.
  • the output signals Se1 to Se n 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 16 is set, each of the two Time counter stages 143 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 n being activated.
  • FIG. 4 Another example for monitoring the distance zones e1 to e n 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 57 at the output of the amplifier 44 shown in detail.
  • It includes a comparator evaluation 45 for interference signal detection or for detection detection. If signal amplitudes appear within the range selected as a function of the distance, a memory cell 46 and a timer 47 are activated. The timer 47 resets the memory 46 within a time that is selected as a function of the distance. If the corresponding negated signal amplitude is reached within this time, then additional memory element 48 is set and an actuator signal A e4 is set via an AND link 40 of the outputs of the two memories 46, 48.
  • one of the two memory elements 51 or 52 is set as a function of the polarity of the signal amplitude and activates an actuator B e4 with a time delay 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)
  • Length Measuring Devices By Optical Means (AREA)
  • Burglar Alarm Systems (AREA)
  • Studio Devices (AREA)
  • Radiation Pyrometers (AREA)
EP87105733A 1986-07-03 1987-04-16 Passiver Infrarot-Bewegungsmelder Expired - Lifetime EP0250746B1 (de)

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
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
DE3622371 1986-07-03

Publications (3)

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

Family

ID=6304323

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87105733A Expired - Lifetime EP0250746B1 (de) 1986-07-03 1987-04-16 Passiver Infrarot-Bewegungsmelder

Country Status (3)

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EP (1) EP0250746B1 (enrdf_load_stackoverflow)
AT (1) ATE71756T1 (enrdf_load_stackoverflow)
DE (2) DE3622371A1 (enrdf_load_stackoverflow)

Families Citing this family (7)

* 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
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
GB2314410A (en) * 1996-06-18 1997-12-24 Siemens Plc Passive Infra-Red Detection System suitable for Traffic Control Systems
DE10235292A1 (de) * 2002-08-02 2004-02-12 Abb Patent Gmbh Passiv-Infrarot-Bewegungsmelder
US8354643B2 (en) * 2009-10-29 2013-01-15 Suren Systems, Ltd. Infrared motion sensor
US20190323897A1 (en) * 2017-01-13 2019-10-24 The Research Foundation For The State University Of New York Chopped passive infrared sensor apparatus and method for stationary and moving occupant detection

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH599642A5 (enrdf_load_stackoverflow) * 1976-11-15 1978-05-31 Cerberus Ag
US4339748A (en) * 1980-04-08 1982-07-13 American District Telegraph Company Multiple range passive infrared detection system
DE3128256A1 (de) * 1981-07-17 1983-02-03 Richard Hirschmann Radiotechnisches Werk, 7300 Esslingen Bewegungsmelder zur raumueberwachung
EP0107042B1 (de) * 1982-10-01 1987-01-07 Cerberus Ag Infrarot-Detektor zur Feststellung eines Eindringlings in einen Raum
JPS59195179A (ja) * 1983-04-20 1984-11-06 Uro Denshi Kogyo Kk 侵入警報器

Also Published As

Publication number Publication date
ATE71756T1 (de) 1992-02-15
DE3622371C2 (enrdf_load_stackoverflow) 1989-08-10
EP0250746A3 (en) 1988-10-19
DE3776001D1 (de) 1992-02-27
EP0250746A2 (de) 1988-01-07
DE3622371A1 (de) 1988-02-04

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