EP0063663A1 - Verfahren und Einrichtung zur Detektion von Körpern in Bewegung und entsprechender Messwertgeber - Google Patents

Verfahren und Einrichtung zur Detektion von Körpern in Bewegung und entsprechender Messwertgeber Download PDF

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Publication number
EP0063663A1
EP0063663A1 EP81400678A EP81400678A EP0063663A1 EP 0063663 A1 EP0063663 A1 EP 0063663A1 EP 81400678 A EP81400678 A EP 81400678A EP 81400678 A EP81400678 A EP 81400678A EP 0063663 A1 EP0063663 A1 EP 0063663A1
Authority
EP
European Patent Office
Prior art keywords
signal
alarm
circuit
detection device
output
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.)
Withdrawn
Application number
EP81400678A
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English (en)
French (fr)
Inventor
Bernard Lauwick
Jean-Claude Lanore
Philippe Detriche
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.)
Compagnie Centrale Sicli SA
Original Assignee
Compagnie Centrale Sicli SA
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 Compagnie Centrale Sicli SA filed Critical Compagnie Centrale Sicli SA
Priority to EP81400678A priority Critical patent/EP0063663A1/de
Publication of EP0063663A1 publication Critical patent/EP0063663A1/de
Withdrawn legal-status Critical Current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

Definitions

  • the invention relates to a method and a device for detecting moving bodies, in particular for triggering an alarm, and a corresponding sensor.
  • the object of the invention is to avoid these drawbacks by producing a device for detecting a moving body sensitive to tangential and radial movements, capable of distinguishing a small object close to a large distant object seen from the same solid angle, and having a very low rate of false alarms.
  • the subject of the invention is a method for detecting moving bodies, characterized in that: the space to be monitored is broken down into a certain number of sectors, a photo-sensitive receiver is assigned to each sector, each is connected alternately receivers at one of two terminals, in the event of movement of a body in the space to be monitored, a periodic electrical difference signal is collected between these terminals, this signal is processed by means of a filter whose bandwidth is characteristic of the moving body, a shaping circuit and an up-down counter to deliver a pre-alarm signal of fixed duration, confirm this pre-alarm signal to deliver a confirmed alarm signal to the central panel.
  • the subject of the invention is also a device for detecting moving bodies for implementing the method, cited above, characterized in that it comprises: a sensor with two series of receivers in the form of interdigitated combs delivering in the event of movement a body in space to monitor a periodic electrical difference signal; a filter whose bandwidth is characteristic of the moving body; a circuit for shaping said signal; an up-down counter triggering a pre-alarm signal, and a confirmation circuit to send a confirmed alarm signal to the central panel.
  • Another object of the invention is a sensor forming an integral part of the aforementioned device, characterized in that it comprises: two series of aligned photo-sensitive receivers, associated with an optical element giving on the plane of the sensor an image of the space to be monitored so that each receiver controls an area of this space, the receivers of each series being connected to two terminals one for each series of receivers, and being alternated so that a detector of a series has for neighbor that at least one detector of the other series.
  • a sensor 1 consisting essentially of two series of photo-sensitive receivers 2 "and 3, each series being connected to a terminal, 4 and 5 respectively. These two series of receivers are arranged according to the general shape of interdigitated combs.
  • Each receiver 2 or 3 consists essentially of a photo-sensitive element delivering a usable electrical signal.
  • these sensitive elements can be photodiodes, infrared diodes, or any photo-sensitive element, insofar as it is sought to monitor a variation in illumination.
  • This set of photo-sensitive receivers is associated with an optical element such as a converging lens for example (not shown) having the function of giving on the plane of the detector an image of the space to be monitored, each receiver thus controls an area space to watch.
  • an optical element such as a converging lens for example (not shown) having the function of giving on the plane of the detector an image of the space to be monitored, each receiver thus controls an area space to watch.
  • the processing performed by the circuit of FIG. 2 consists in detecting the presence of a periodic signal, in verifying that its frequency is compatible with the phenomenon to be detected, and in ensuring that this signal persists long enough in order to overcome parasites.
  • photodiodes are used allowing detection throughout the visible spectrum and even in the near infrared.
  • Each comb consists for example of a series of 12 arrays of silicon photodiodes. These bars are integrated on the same circuit.
  • a differential amplifier amplifies the difference of the signals coming from the two combs, the signal is then filtered between 0.2 Hz and 10 Hz for example, characterizing the minimum speeds and maximum movement of people in front of the detector, for its maximum and minimum distance from the detector.
  • the terminals 4 and 5 are connected to the two inputs of a differential amplifier 6 whose output is connected to a high-pass filter 7 whose cut-off frequency is fixed at 0.2 Hz for example .
  • the output of the filter 7 is applied to the input of an amplifier 8 with variable and programmable gain, so as to adapt to the ambient background noise conditions.
  • the output of amplifier 8 is applied to a filter 9 whose bandwidth is for example between 0.2 and 10 Hz.
  • This filter is capable of receiving an inhibition command via a terminal 10.
  • the output of the filter 9 is applied to a circuit 11 for shaping the signals consisting essentially of a flip-flop, the two complementary outputs of which are applied to a programmable up-down counter 12 and under the control of a clock 13.
  • the up-down counter 12 can be of the analog up-down counter type essentially consisting of an operational amplifier and capacitors. At each pulse from the signal shaping circuit 11, a first capacitor charges in parallel on the input of the operational amplifier. It then discharges into a second capacitor which is connected between the input and the output of the operational amplifier. At the frequency of the clock 13, part of the charge of this second capacitor is taken via a third capacitor, so as to carry out a countdown. The purpose of this down-counting is to reset the up-down counter regularly to get rid of spurious signals. This countdown can be adjustable in order to adapt to risks and disturbances.
  • the output of the up-down counter 12 is applied to a comparator 14 which switches as soon as the counter has totaled a certain number of useful signals, close enough together that the down-counting has not erased them.
  • the output of the comparator 14 is connected to the input of a pre-alarm circuit 15, itself under the control of the clock 13, which delivers a pre-alarm signal of programmable duration T, the duration of which is of the order of a few seconds for example.
  • the pre-alarm circuit 15 sends to the up-down counter 12 a reset signal by the conductor 16.
  • the pre-alarm signal is sent to an AND gate 17 and to an OR gate 18. These two gates receive on their other input a signal coming from a confirmation input 19.
  • the OR gate 18 delivers an "output” signal unconfirmed “at 20, and the AND gate 17 delivers an” alarm output “signal at 21.
  • These" unconfirmed output "and” alarm output "signals can be sent to a central signaling panel which delivers the signal pre-alarm or alarm proper.
  • the output 20 of the OR gate 18 is directly wired to the input 19 of confirmation.
  • the pre-alarm signal is taken as a confirmation signal and the alarm is triggered.
  • the pre-alarm can also be confirmed by a corresponding signal from another neighboring detector, as shown in FIG. 3, where the same references assigned the index "prime" designate the same elements of the neighboring detector. This pre-alarm can also be confirmed by the alarm signal from any other detector.
  • the circuit of FIG. 2 also includes a reference to ambient lighting and a possibility of inhibiting the alarm circuit.
  • Input 22 receives a signal representative of ambient lighting. This signal can come from a simple auxiliary sensor with specific photodiode.
  • This signal is applied to a low-pass filter 23 whose cut-off frequency is for example 2 Hz.
  • the filter 23 is connected to the inputs of two comparators 24 and 25 which receive on their other inputs reference signals, respectively of low threshold 26 and high threshold 27.
  • the outputs of the comparators 24 and 25 are applied to an OR gate 28, itself connected to an inhibition circuit 29.
  • the output 10 of this inhibition circuit is applied to the filter 9, and the output 30 is capable of transmitting to the central signaling panel a signal for inhibiting the detector.
  • an inhibition or fault signal is sent to the central panel. To avoid false alarms, this signal is only addressed to the central panel if the cause of the fault persists for a predetermined time, for example one second.
  • a periodic signal is collected at the terminals of the sensor 1. It is checked by filtering that this signal is indeed of a frequency included in the selected range, and therefore that it is indeed characteristic of the body in movement.
  • This signal is processed by shaping and up-down counting in order to trigger a pre-alarm of a few seconds. If this pre-alarm is confirmed by another detector of the same type or by a detector of any other type, or by wiring the detector itself between output 20 and confirmation input 19, then the alarm is triggered at central signaling board.
  • the operation of the detector is controlled as a function of the ambient lighting, by comparison with a high threshold and a low threshold and signaling of a fault, which makes it possible in particular to report any sabotage attempts by masking or glare from the sensor.
  • a movement control is carried out, in the visible and near infrared range (0.4 to 1.1 microns).
  • a pre-alarm can be confirmed by means of a second analogous detector or by means of a detector of another type, for example a passive infrared detector, this confirmation being provided on the detector itself. even, and not at the central panel, which receives only a confirmed alarm.
  • the detector can be dispensed with by self-checking its operating points thanks to the high and low ambient lighting thresholds. Finally, it is possible to program the gain of the amplifier 8, the sensitivity of the up-down counter 12, and the duration of the pre-alarm, for example.
  • FIG. 5 shows an arrangement of two detectors 32, 36 intended to signal a prolonged movement in a traffic area. The moving body must then be detected by the second detector for the few seconds that the pre-alarm signal from the first detector lasts.
  • the applications of the method according to the invention are in particular: the detection of intruders, or embers in certain industrial drying installations for example, the detection of passage of all moving bodies and the flame detection (the oscillation of the flames being detected as motion).

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)
EP81400678A 1981-04-29 1981-04-29 Verfahren und Einrichtung zur Detektion von Körpern in Bewegung und entsprechender Messwertgeber Withdrawn EP0063663A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP81400678A EP0063663A1 (de) 1981-04-29 1981-04-29 Verfahren und Einrichtung zur Detektion von Körpern in Bewegung und entsprechender Messwertgeber

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP81400678A EP0063663A1 (de) 1981-04-29 1981-04-29 Verfahren und Einrichtung zur Detektion von Körpern in Bewegung und entsprechender Messwertgeber

Publications (1)

Publication Number Publication Date
EP0063663A1 true EP0063663A1 (de) 1982-11-03

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Application Number Title Priority Date Filing Date
EP81400678A Withdrawn EP0063663A1 (de) 1981-04-29 1981-04-29 Verfahren und Einrichtung zur Detektion von Körpern in Bewegung und entsprechender Messwertgeber

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EP (1) EP0063663A1 (de)

Cited By (1)

* 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

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2080963A1 (de) * 1970-02-06 1971-11-26 Optical Coating Laboratory Inc
US3781842A (en) * 1972-04-27 1973-12-25 Vidar Lab Inc Intrusion detecting apparatus and method
US3789384A (en) * 1972-12-29 1974-01-29 Lawrence Security Inc Security system operated by changes in light at specified locations
US3958118A (en) * 1975-02-03 1976-05-18 Security Organization Supreme-Sos-Inc. Intrusion detection devices employing multiple scan zones
US4225786A (en) * 1978-09-15 1980-09-30 Detection Systems, Inc. Infrared detection system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2080963A1 (de) * 1970-02-06 1971-11-26 Optical Coating Laboratory Inc
US3781842A (en) * 1972-04-27 1973-12-25 Vidar Lab Inc Intrusion detecting apparatus and method
US3789384A (en) * 1972-12-29 1974-01-29 Lawrence Security Inc Security system operated by changes in light at specified locations
US3958118A (en) * 1975-02-03 1976-05-18 Security Organization Supreme-Sos-Inc. Intrusion detection devices employing multiple scan zones
US4225786A (en) * 1978-09-15 1980-09-30 Detection Systems, Inc. Infrared detection system

Cited By (1)

* 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

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Inventor name: LANORE, JEAN-CLAUDE

Inventor name: LAUWICK, BERNARD

Inventor name: DETRICHE, PHILIPPE