EP0411234A1 - Elektronisches automatisches Überwachungssystem - Google Patents

Elektronisches automatisches Überwachungssystem Download PDF

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Publication number
EP0411234A1
EP0411234A1 EP89870122A EP89870122A EP0411234A1 EP 0411234 A1 EP0411234 A1 EP 0411234A1 EP 89870122 A EP89870122 A EP 89870122A EP 89870122 A EP89870122 A EP 89870122A EP 0411234 A1 EP0411234 A1 EP 0411234A1
Authority
EP
European Patent Office
Prior art keywords
signal
detection
obstacle
frequency
receiver
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
EP89870122A
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English (en)
French (fr)
Other versions
EP0411234B1 (de
Inventor
André Mousset
Hubert Raskin
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.)
Belgian Electronic Research SA
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Belgian Electronic Research SA
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Filing date
Publication date
Application filed by Belgian Electronic Research SA filed Critical Belgian Electronic Research SA
Priority to DE1989620873 priority Critical patent/DE68920873T2/de
Priority to EP19890870122 priority patent/EP0411234B1/de
Publication of EP0411234A1 publication Critical patent/EP0411234A1/de
Application granted granted Critical
Publication of EP0411234B1 publication Critical patent/EP0411234B1/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
    • G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
    • G08B29/02—Monitoring continuously signalling or alarm systems
    • G08B29/04—Monitoring of the detection circuits

Definitions

  • the present invention relates to an electronic system allowing an electronic detection device to self-monitor, that is to say to automatically detect any failure or anomaly affecting its operation and to react in this case in a previously determined manner.
  • a self-monitoring system of this kind can be incorporated, for example, in an opening detector for an automatic door, in an intrusion detector for surveillance or access control applications or in a detector for industrial applications, short in any application for which the safety of use requires information related to the good working condition of the detector.
  • Electronic detectors comprising a transmitter for emitting waves or radiation, for example microwave, ultrasonic waves or infrared radiation, and a receiver for picking up the reflected waves or the diffuse radiation reflected by an obstacle located in the covered space field. so as to produce a detection signal as a function of the reflected intensity.
  • a first example is that of the devices for the automatic door opening control.
  • a motion detector reacts to any movement in the detection field and generates a control signal for opening the door.
  • a presence detector reacts to any variation in waves or reflected radiation, corresponding to the presence of an obstacle and generates a control signal for opening the door.
  • a second example is that of surveillance devices (theft security systems, for example).
  • a movement or presence detector reacts to any movement or presence in the detection field and causes the installation to alarm.
  • sabotage detection circuits are conventionally used, in many cases the failure of one or other component constituting the detector renders the latter inoperative and the fault can only be observed during maintenance operations on the detector. the installation. This constitutes a risk for the user who believes he is protected while his installation is only partially operational. It is clear that the unreported failure of an intrusion detector can have damaging consequences, the way being open to the potential intruder.
  • the purpose of the present invention is to overcome the drawbacks and failures mentioned above and to allow any electronic detection device to self-monitor, to automatically detect any failure which affects its operation and to react immediately in an appropriate and reliable manner.
  • a method for ensuring the self-monitoring of an electronic detection device comprising a radiation emitter in a detection field, a receiver for receiving the radiation reflected by an obstacle located in the detection field and producing a detection signal, and a switching device responding to the detection signal, method according to which the signal from the transmitter is modulated by a pulsed signal so that the detection signal consists of a signal having the frequency of the pulsed signal when no obstacle is in the detection field and that it consists of a signal having the frequency of the receiver signal when an obstacle is in the detection field.
  • the invention also relates to an electronic detection device comprising a radiation emitter in a detection field, a receiver for receiving the radiation reflected by an obstacle located in the detection field, and in addition a pulsed signal generator for modulating the radiation emitted by the transmitter, means for receiving the detection signal and producing a first signal having the frequency of the pulsed control signal when no obstacle is detected in the detection field and for producing a second signal having the frequency of the receiver signal when an obstacle is detected in the detection field and connected means for receiving said first and second signals to produce a control signal having a first state in response to said first signal and having a second state in response to said second signal, the control signal serving to actuate a switching member.
  • the failure of any active or passive circuit in a device is automatically detected, immediately causing the switching tion of the output circuit and thus allowing the appropriate actions, the latter being linked to the function of the device. It is understood that the power supply failures of the device are also detected. For example, a detector for automatic door opening will force the opening of the controlled door in the event of a sensor failure while a monitoring detector, in the event of failure, will issue a warning or an alarm.
  • the device represented in FIG. 1 is an exemplary microwave device usable as a detector for automatic door opening or as an intrusion detector, but not provided with a self-monitoring system.
  • a transmitter circuit comprises a Gunn diode 12 placed in a tuned cavity; suitably polarized by a supply circuit 11, the Gunn diode generates a microwave signal which is radiated into space by a horn antenna.
  • any object or person moving in front of the detector reflects part of the incident wave; this reflected wave is picked up by the antenna and formula swapped with the incident wave thanks to a Schottky diode 13 placed in a waveguide located between the cavity and the antenna. Consequently and according to the Doppler effect, a low frequency signal is available at the terminals of the mixing diode 13.
  • the frequency of the Doppler signal is proportional to the speed of the obstacle detected and its amplitude is proportional to the size of the object.
  • the Doppler signal is presented at the input of an amplification cell 14 whose bandwidth, for example from 5 to 150 Hz, has been determined to correspond to the speeds of the obstacles to be detected.
  • Waveform 100 shows a time slice during which a useful Doppler signal appears.
  • the Doppler signal passes through a shaping cell 15; there comes out a square signal 101 which corresponds to the input signal 100. This signal is then integrated into a cell 16 and transformed into an increasing signal by stairs 102.
  • a comparator 17 makes it possible to assign a binary value (0/1) to an output signal whose waveform is shown at 103.
  • the signal 103 controls the output stage 18 actuating the relay 19 whose output contact 190 is connected to the device to be controlled, for example the mechanism of an automatic door.
  • the failure of one or more components of the circuit of FIG. 1 causes the operation of the detector to stop without particular signaling and without securing the controlled device.
  • the failure of the Gunn 12 or Schottky 13 diode is such that no signal no longer reaches the measurement chain and the output stage remains perpetually inactive, with the consequences mentioned above.
  • the failure of the integration circuit 16 prevents the useful signal from reaching the switching level of the comparator 17 so that the output stage also remains inactive.
  • a detection device an example of which is described above, must have its arrangement profoundly modified in order to give it the additional self-monitoring function sought.
  • the general principle on which the invention is based is the generation of control pulses upstream of the circuit and the control of their presence at the end of the circuit. A judicious interconnection of the components is necessary so that the control pulses pass through all the components of the circuit.
  • FIG. 2 attached hereto shows a block diagram of an exemplary microwave device usable as a detector for automatic door opening or as an intrusion detector, but incorporating the invention so as to ensure, in addition to its normal function, that of self-monitoring.
  • a transmitter circuit comprises a Gunn diode 22 placed in a tuned cavity; suitably polarized by a supply circuit 21, the Gunn diode generates a microwave signal which is radiated in space by a horn antenna.
  • an oscillator-modulator cell 25 constitutes a pulsed signal generator connected to modulate the Gunn diode 22 in amplitude. by a square signal at a frequency of 20 kHz for example. Consequently, the signal radiated in space is also modulated and this modulation is picked up by the Schottky diode 23 when the signal has been reflected by the environment or by an obstacle to be detected.
  • the signal received is amplified in an amplification and filtering cell 24, the characteristic of which is the variable gain as a function of the frequency: for example 40 dB for the frequency band comprised for example between 5 Hz and 200 Hz and 20 dB for the frequency band between, for example, 200 Hz and 22 kHz; in any case, the gain for the frequency band corresponding to the Doppler frequency (for example 5 to 200 Hz) is always significantly higher than the gain for the frequency band going up to the control frequency or beyond.
  • the characteristic of which is the variable gain as a function of the frequency: for example 40 dB for the frequency band comprised for example between 5 Hz and 200 Hz and 20 dB for the frequency band between, for example, 200 Hz and 22 kHz; in any case, the gain for the frequency band corresponding to the Doppler frequency (for example 5 to 200 Hz) is always significantly higher than the gain for the frequency band going up to the control frequency or beyond.
  • a signal is obtained at the output of the amplification and filter cell 24 whose waveform is shown at 201 and whose frequency is the same as that of the pulsed signal 200.
  • a low frequency Doppler signal is available at the terminals of the Schottky diode 23 and a signal is obtained at the output of the amplification and filter cell 24.
  • the wave is shown at 202 and the frequency of which is the same as that of the signal from the receiver 23, that is to say a signal resulting from the superposition of the modulation on the control frequency.
  • the characteristic of the amplification and filtering cell 24 is such that the amplification of the Doppler signal is far greater than the amplification of the signal modulated at 20 kHz and that, compared to a reference voltage, the signal modulated at 20 kHz is always of the same sign as the Doppler signal that it affected.
  • the output of the amplification and filtering cell 24 is connected to the negative input (-) of a comparator 26 while the positive input (+) of comparator 26 is applied a reference voltage.
  • the signal 201 at the negative input of the comparator 26 produces at the output of the comparator a signal 203 having the frequency of the pulsed signal 200.
  • comparator 26 is applied to the input of a monostable rocker 27 whose main function is to calibrate the duty cycle of the pulses; the pulses at 20 kHz are transformed into regular pulses as shown by the waveform shown in 205, while the rising edges of the Doppler signal are transformed into short pulses, of the order of 25 microseconds in duration for example, as shown in 206.
  • the output signal from the flip-flop 27 is injected into a cell 28 which supplies the output relays.
  • the cell 28 comprises for example a field effect transistor 31, of the Mosfet type, controlled by the pulse signal and which modulates the primary of a transformer 32, the secondary of this transformer being connected to a filtering cell 33.
  • a signal whose waveform is shown at 205 is transformed at the output of cell 28 into a continuous signal having a first state 207 and having a voltage level sufficient to keep the output relays activated; this state 207 corresponds to the periods when no obstacle is detected, so that the relays remain activated when the detector is at rest.
  • a signal whose waveform is shown at 206 is transformed at the output of cell 28 into a continuous signal having a second state 208 and having a practically zero voltage level which does not make it possible to maintain the output relays activated.
  • This state 208 corresponds to the obstacle detection periods so that the relays are deactivated upon detection.
  • the output relays 29 control a door opening control member or an alarm device for example.
  • Other embodiments of the cell 28 are of course possible, the solution described being only one example in no way limiting.
  • a redundant circuit at the output relays 29 and their contacts keeps the system operational when an output contact fails. Indeed, if one of the group of contacts 30a and 30b remains blocked in a permanent state, the supply of the relays 29 is interrupted, either immediately or after the next detection, thus definitively preventing the activation of the relays.
  • the arrangement according to the invention allows the device to self-monitor; in fact, the proposed arrangement allows the pulses generated upstream to pass through all parts of the circuit, until detection at the end of the line.
  • the transformation of the pulses into a sufficient voltage level to activate the output relays is such that, when these pulses disappear, either during a detection, or because of the failure of any component, the output relays are no longer supplied and transmit information by switching. It is obvious that in the absence of supply, the output relays also switch and that the safety being positive, the cut of the connection cable between the output contacts and the controlled member is also detected. Finally, redundancy at the output relays and their contacts makes it possible to reinforce the security of the output stage.

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  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)
EP19890870122 1989-07-31 1989-07-31 Elektronisches automatisches Überwachungssystem Expired - Lifetime EP0411234B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE1989620873 DE68920873T2 (de) 1989-07-31 1989-07-31 Elektronisches automatisches Überwachungssystem.
EP19890870122 EP0411234B1 (de) 1989-07-31 1989-07-31 Elektronisches automatisches Überwachungssystem

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19890870122 EP0411234B1 (de) 1989-07-31 1989-07-31 Elektronisches automatisches Überwachungssystem

Publications (2)

Publication Number Publication Date
EP0411234A1 true EP0411234A1 (de) 1991-02-06
EP0411234B1 EP0411234B1 (de) 1995-01-25

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EP19890870122 Expired - Lifetime EP0411234B1 (de) 1989-07-31 1989-07-31 Elektronisches automatisches Überwachungssystem

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EP (1) EP0411234B1 (de)
DE (1) DE68920873T2 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10200539B4 (de) * 2001-01-11 2012-04-26 Reglomat Ag Verfahren zur Selbstüberwachung eines Gerätes zur automatischen Betätigung von Gegenständen sowie das Gerät

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202010018461U1 (de) 2010-07-26 2016-11-08 Bea Sa Dopplertransceiver
EP2418505A1 (de) 2010-07-26 2012-02-15 Bea S.A. Modulierender Retroreflektor zum Testen eines Dopplertransceivers

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3932870A (en) * 1974-05-31 1976-01-13 American District Telegraph Company On-line test circuit for intrusion alarm systems
FR2339219A2 (fr) * 1974-03-27 1977-08-19 Pittway Corp Appareil de detection d'intrusion et d'alarme a ondes ultrasonores ou a haute frequence
FR2344899A1 (fr) * 1976-03-19 1977-10-14 Hochiki Co Dispositif d'alarme detectant un objet en mouvement en l'effet doppler et emettant des signaux d'alarme
US4660024A (en) * 1985-12-16 1987-04-21 Detection Systems Inc. Dual technology intruder detection system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2339219A2 (fr) * 1974-03-27 1977-08-19 Pittway Corp Appareil de detection d'intrusion et d'alarme a ondes ultrasonores ou a haute frequence
US3932870A (en) * 1974-05-31 1976-01-13 American District Telegraph Company On-line test circuit for intrusion alarm systems
FR2344899A1 (fr) * 1976-03-19 1977-10-14 Hochiki Co Dispositif d'alarme detectant un objet en mouvement en l'effet doppler et emettant des signaux d'alarme
US4660024A (en) * 1985-12-16 1987-04-21 Detection Systems Inc. Dual technology intruder detection system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10200539B4 (de) * 2001-01-11 2012-04-26 Reglomat Ag Verfahren zur Selbstüberwachung eines Gerätes zur automatischen Betätigung von Gegenständen sowie das Gerät

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Publication number Publication date
DE68920873D1 (de) 1995-03-09
DE68920873T2 (de) 1995-08-31
EP0411234B1 (de) 1995-01-25

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