EP0711442A1 - Detecteur infrarouge d'intrusion actif - Google Patents

Detecteur infrarouge d'intrusion actif

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Publication number
EP0711442A1
EP0711442A1 EP95917879A EP95917879A EP0711442A1 EP 0711442 A1 EP0711442 A1 EP 0711442A1 EP 95917879 A EP95917879 A EP 95917879A EP 95917879 A EP95917879 A EP 95917879A EP 0711442 A1 EP0711442 A1 EP 0711442A1
Authority
EP
European Patent Office
Prior art keywords
signal
detector according
infrared detector
infrared
controller
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
EP95917879A
Other languages
German (de)
English (en)
Other versions
EP0711442B1 (fr
Inventor
Peter Kunz
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.)
Siemens Building Technologies AG
Original Assignee
Cerberus AG
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 Cerberus AG filed Critical Cerberus AG
Priority to EP95917879A priority Critical patent/EP0711442B1/fr
Publication of EP0711442A1 publication Critical patent/EP0711442A1/fr
Application granted granted Critical
Publication of EP0711442B1 publication Critical patent/EP0711442B1/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
    • G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
    • G08B29/18—Prevention or correction of operating errors
    • G08B29/183—Single detectors using dual technologies
    • 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
    • G08B13/181—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using active radiation detection systems
    • G08B13/187—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using active radiation detection systems by interference of a radiation field

Definitions

  • the present invention is in the field of infrared detectors, which are detectors that monitor a room for unauthorized entry and for this purpose evaluate infrared radiation received by the detector.
  • infrared detectors There are two types of such infrared detectors, the passive and the active.
  • the detector waits until a radiation source that emits radiation that differs from the surroundings, that is to say has a different temperature than its surroundings, penetrates into the visual field.
  • the passive infrared detectors which are relatively inexpensive and widely used today, can in principle only detect radiating objects and reach a limit as soon as objects, for example valuables, are to be monitored that can be removed by mechanical, non-detectable means.
  • special measures against so-called masking that is the unnoticed changing or covering of the detector's field of view, must be taken with passive infrared detectors.
  • the active infrared detectors do not process the thermal radiation emitted by objects in the visual field, but rather actively irradiate the space to be monitored and react to changes in the reflected infrared radiation. As a result, they can also detect movements of "dead", ie non-radiating objects. In addition, they are very difficult to mask because they notice any approach. For this, the active infrared detectors have certain difficulties in terms of sensitivity and false alarm security because the reflected infrared radiation can be overlaid by such strong interference that a reliable detection of movements is almost impossible.
  • the invention relates to an active infrared detector for the detection of movements in a surveillance room, with a transmitter for transmitting modulated infrared radiation into the surveillance room, with a receiver for the infrared radiation reflected from the surveillance room, and with one connected to the receiver and means for obtaining an evaluation circuit containing a useful signal.
  • the evaluation circuit contains an operational amplifier designed as a synchronous amplifier, from. which only those receive signals that are in phase with the transmitted signal are amplified. These signals are integrated in two integrators with different time constants, both integrators generating the same voltage in the undisturbed state, and a difference between these voltages indicates an intruder.
  • This infrared detector cannot be satisfactory in terms of responsiveness, because the integration of the received signal with two different time constants does not offer a sufficient guarantee that every object movement in the surveillance space is actually recognized.
  • the detector is also not false alarm-proof, because it cannot be ruled out that a difference between the signals of the integrators is caused by causes other than an object movement.
  • the invention is now intended to improve this known active infrared detector with regard to sensitivity, reliability and insensitivity to external influences.
  • the active infrared detector according to the invention for solving the problem is characterized in that the evaluation circuit has a controller which is acted upon on the one hand with the useful signal and on the other hand connected to the output of the receiver for emitting a compensation signal which is superimposed on the receiver signal, and that the compensation signal is selected such that that the useful signal is adjusted to the value zero.
  • the adjustment of the useful signal to the value zero has the advantage that the maximum sensitivity is always retained; the receiver acts like a self-balancing scale. This immediately results in an undesired interference signal, provided that it has the same frequency and phase as the emitted infrared radiation, is compensated for to zero and does not lead to a throttling of the receiver to minimal sensitivity. Interference signals from other frequencies are not so critical because they can be easily filtered out.
  • a first preferred embodiment of the infrared detector according to the invention is characterized in that common optics are provided for the transmitter and receiver.
  • the use of a common optic enables a massive reduction in manufacturing costs and dimensions, as well as the achievement of a maximum range with low power consumption.
  • a second preferred embodiment of the infrared detector according to the invention is characterized in that the evaluation circuit has an analog / digital converter connected downstream of the controller, at one output of which the digitized controller signal is available and the other output with a digital / analog converter for generation a voltage corresponding to the respective digital signal value is connected, and that this voltage is used to generate the compensation signal.
  • the digitization of the controller signal has the advantage that a signal evaluation that is more differentiated and intelligent than before is possible.
  • the one output of the analog / digital converter is connected to a microprocessor.
  • the microprocessor enables an increase in the resolution and, on the other hand, it creates the prerequisite for copying the sensor present in the infrared detector with a second to couple another sensor principle and to evaluate the signals of both sensors together.
  • Fig. 1 is a schematic sectional view of an infrared detector according to the invention
  • Fig. 2 is a block diagram of a first embodiment of the evaluation circuit of the
  • FIG. 4 shows a block diagram of a second exemplary embodiment of the evaluation circuit of the
  • the active infrared motion detector 1 shown in FIG. 1 essentially consists of a transmitter S which irradiates the room to be monitored with pulsating infrared light, a receiver E for the infrared radiation reflected from the monitoring room, and evaluation and control electronics 2 and from a power supply 3.
  • the transmitter S is formed by an infrared light-emitting diode (IRED) 4 and the receiver E by a photodiode 5.
  • Transmitter S, receiver E, electronics 2 and power supply 3 are arranged in a common housing 6, which is mounted in a suitable location in the room to be monitored, for example on a wall or on the ceiling.
  • the power supply 3 is connected to an external supply and contains a fixed voltage regulator (not shown).
  • the housing 6 contains an infrared-transmissive window 7 in the area of the transmitter S and the receiver E.
  • suitable optics 8 are provided, which of course do not have to be arranged between the window 7 on the one hand and the transmitter and receiver S or E on the other hand, but can also be integrated into the window 7.
  • the optics 8 can be a lens or a mirror optics. It is essential that common optics are provided for transmitter S and receiver E. In other words, this means that the receiver E "sees" exactly those areas of the monitoring room that the transmitter S is currently applying infrared radiation to. And this enables a multiple range with the same power consumption or a massively reduced power consumption with the same range.
  • a shield 9 is arranged between the transmitter S and the receiver E to prevent a direct light connection between these two elements.
  • the electronics 2 has an alarm output 10 for the alarm signals obtained during the signal evaluation. These can activate an internal and / or an external alarm display built into the respective detector 1.
  • a first modulator 11 is connected upstream of the infrared light-emitting diode 4, through which a suitable modulation of the radiation emitted by the infrared light-emitting diode 4 takes place.
  • This radiation preferably consists of a continuous sequence of pulses and pulse pauses, so that the room to be monitored is irradiated with pulsating infrared light. It can also make sense to insert a longer, predetermined transmission pause after a sequence of a certain number of pulses and pulse pauses. In this case, the monitoring room is irradiated by pulse trains or pulse packets which are emitted intermittently and are interrupted by pauses in transmission.
  • the transmission pauses to the pulse trains can be in a fixed or in a variable time ratio.
  • the first modulator 11 is controlled by a control stage 12, which receives its clock from a clock generator 13.
  • the control stage 12 determines in particular the time sequence and the length of the signals emitted to the infrared light-emitting diode 4.
  • the infrared radiation emitted by the infrared light-emitting diode 4 is bundled by the optics 8 (FIG. 1) and directed into a defined area of the monitoring room.
  • the infrared radiation reflected from this area is collected by the optics 8 and thrown onto the light-sensitive diode 5.
  • the received infrared radiation is converted by the diode 5 into a proportional current (receiver signal) I e , which a the current / voltage converter 14 connected downstream of the diode 5 and converted into a voltage (received signal) U e by the latter.
  • the transducer 14 also acts as a type of filter for uniform light by suppressing light from the sun and room lighting.
  • a frequency filter 15 connected downstream of the current / voltage converter 14, undesired frequencies are filtered out from the received signal U e , as a result of which interference caused by incandescent, fluorescent and discharge lamps is suppressed.
  • the output of the frequency filter 15 is connected to a switch 16 controlled by the control stage 12 in time with the modulation of the infrared light-emitting diode 4.
  • the output signal of the frequency filter 15, which is largely free of interference, is alternately fed to one of two integrators 17, 17 'via the switch 16.
  • the switch 16 is controlled by the control stage 12 in such a way that the received signal U e is sent to one integrator, for example to the integrator 17, during the duration of the pulse transmission and to the other integrator, for example to the integrator, for the duration of the pulse pauses 17 '.
  • the switch 16 remains in a neutral position in which neither of the two integrators 17 or 17 'is acted upon by the received signal.
  • the switch 16 is preferably formed by a controlled switch.
  • the integrator 17 receives exclusively the reflected infrared transmission signal including any remnants of the filtered interference signal from the time of the transmission pulses, and the integrator 17 'receives only possible residues of the filtered interference signal from the time of the pulse pauses. so that the reflected infrared transmission signal can be obtained by simply forming the difference between the output signals of the two integrators 17 and 17 '.
  • the aforementioned difference formation takes place in a stage 18 connected downstream of the two integrators 17, 17 '. Its output signal is the infrared transmission signal U n , largely cleaned of interference and reflected from the monitoring room, which forms the useful signal for the signal evaluation.
  • the reflected infrared transmission signal will also remain constant. However, if an object moves in the monitoring room, regardless of whether it is a living being, a machine or any object, the reflected infrared transmission signal changes accordingly. Gaseous substances only influence the reflected signal if the reflection behavior of the space or section of the space containing the substance changes. The latter means that mere air movements, such as warm air rising from a radiator, are not detected by the detector and therefore cannot trigger a false alarm, whereas the sudden occurrence of vapors or smoke and the like alters the reflection behavior and therefore changes Detector is detected.
  • the useful signal U n is supplied on the one hand to a controller 19 and on the other hand to two comparators 20 and 20 '.
  • the output of the controller 19 is connected to the one input of a second modulator 21, the second input of which is connected to the control stage 12 and the output of which is connected to the input of the current / voltage converter 14.
  • the second modulator 21 superimposes a compensation current Ik on the signal of the photodiode 5, the time conditions for the superimposition of this compensation current being determined by the control stage 12.
  • the controller 19 changes the compensation current I ⁇ until the output signal of stage 18, ie the useful signal U n, becomes zero. This means that the maximum sensitivity is always maintained.
  • the control loop can be compared with a self-balancing scale or with a bridge circuit, the value zero of the useful signal representing the rest position.
  • Each received infrared signal, including the unwanted basic signal, is compensated for to zero.
  • This is the only way to use a common optic 8 for the transmitter and receiver S or E (FIG. 1). This is because reflections of lenses, mirrors and / or infrared windows caused on the transmitter side, which will usually exceed the reflection signal of a possible object in the surveillance space by potencies suppressed by the control loop.
  • a strongly reflecting object in the field of view of the detector does not lead to a loss in sensitivity, but is compensated for, and the maximum sensitivity is retained.
  • the comparators 20 and 20 ' are used for signal evaluation. They compare the useful signal U n with an upper limit value (comparator 20) and a lower limit value (comparator 20 ') and deliver an alarm signal to the alarm output 10 when it is exceeded or undershot. This signal evaluation can take place in spite of the described compensation of the useful signal, because the whole control process is so slow that the infrared signal received by the photodiode 5 is not immediately corrected to zero even with very careful and slow penetration into the monitoring space, so that the Both comparators 20, 20 'have sufficient time for a detection.
  • the controller 19 Because of the considerable size of the interference reflections caused by imperfect optics 8 or windows 9 (FIG. 1), the controller 19 has to compensate for a very large amount, as a rule over 90% of the total reflections, the interference reflections being caused by the geometry and material of the optics and windows have a fixed value. It would be desirable to compensate for this fixed value by means of an additional, fixed compensation current Ij ⁇ ', as a result of which the amount of total reflections to be compensated by the controller 19 would decrease sharply and the resolution would increase considerably. In this case, the controller 19 would have to accept not only the reflections from the monitoring room, but also any deviations caused by manufacturing tolerances and / or specimen variations of the infrared light-emitting diode 4.
  • a third modulator 22 which is also controlled by the control stage 12, is provided to generate the compensation current ty.
  • This is either set to a fixed value of the compensation current 1 ⁇ 'or, as shown in the figure, it is adjustable.
  • the compensation ström Ik ' are adjusted so that not only the above-mentioned interference reflections, but also the deviations caused by the infrared light emitting diode 4 are compensated.
  • the controller 19 has an approximately logarithmic behavior. If it takes a certain time t to regulate a small change in the useful signal, then regulating a change ten times as large only requires twice the time 2t. This behavior is particularly advantageous when the detector is switched on, where the change in the useful signal is 100% and still does not waste an unnecessarily long time for the regulation.
  • the alarm signal at alarm output 10 can be further evaluated, for example checked for plausibility, what can take place in the detector or in a control center, or it is passed on to a control center without further processing, where an alarm is then triggered.
  • the alarm signal can additionally or alternatively activate a light-emitting diode 23 arranged in the detector.
  • a relay 24 is also provided, the contacts of which enable potential-free evaluation of the alarm signal.
  • the photodiode 5 forming the actual motion detector is connected in parallel with a second photodiode 5 'with preferably identical data with reversed polarity.
  • the geometry of the arrangement is selected such that the one photodiode 5 is arranged at the focal point of the optics 8 (FIG. 1) and the second photodiode 5 'outside of it.
  • the one photodiode 5 receives the radiation reflected from the interstitial space plus any interference reflections
  • the second photodiode 5 ' only receives the interference reflections. So the difference corresponds the photocurrents of the two photodiodes 5 and 5 'the signal sought from the monitoring room, which may at most be superimposed by interference signals such as solar radiation or room lighting.
  • the temperature coefficients of the photosensitivity are mutually compensated for the common received signals.
  • all those influences and potential sources of interference that have an effect on both photodiodes remain ineffective. Influences or disturbances of this type are in particular specimen scatter and temperature drifts of the infrared light-emitting diode 4, as well as specimen scatter and changes over time in the reflection constants of the relevant mechanical components, such as varying colors and surface structures.
  • the controller 19 and the second modulator 21 thus only have the compensation of the infrared signals reflected from the monitoring room, whereas around 95% of the total reflections and photo currents are compensated by the second photo diode 5 '.
  • the influence of the controller 19 can be reduced to around ⁇ 5%, as a result of which.
  • Resolution of the useful signal U n rises to about ten times, which corresponds to approximately ten times the sensitivity for constant limits of the comparators 20, 20 '.
  • Known dual passive infrared motion detectors of this type combine the passive infrared radiation with ultrasound or with microwaves.
  • active infrared motion detector a combination of active / passive infrared is conceivable.
  • Such a combination would be preferable to the known combinations of infrared ultrasound and infrared / microwaves not least because the infrared radiation behaves exactly the same as the visible light and can therefore be controlled with the optical means known from visible light.
  • Infrared radiation is particularly important when protecting easily penetrable areas with an infrared curtain, for example when protecting pictures or sculptures in galleries or museums, or when protecting entire window areas.
  • the evaluation circuit 2 'shown in FIG. 4 differs from the evaluation circuit 2 of FIG. 2 essentially in that another controller is used and in that the controller signal is converted analog / digital and thus for the evaluation in digitized form is available.
  • the first modulator 11 is controlled by a program control stage 26, which has a counter 27, among other things.
  • the program control stage 26 receives its clock from a clock generator 13 and determines the chronological sequence and the length of the signals emitted to the infrared light-emitting diode 4.
  • the reference numeral 28 denotes a temperature sensor assigned to the first modulator 11 for compensating the temperature response of the control circuit containing the infrared light-emitting diode 4 and the photodiode 5.
  • stage 18 downstream of the two integrators 17 and 17 ' the signal processing proceeds analogously to that in the evaluation circuit shown in FIG. 2.
  • the output signal U n of stage 18, which forms the useful signal for the signal evaluation is fed to a controller 29, which is preferably a so-called PID controller, that is to say a controller with a proportional, integral and differential component, and arrives from it a voltage / pulse width converter 30.
  • PID controller a controller with a proportional, integral and differential component
  • the pulse-shaped signal from the converter 30 reaches the program control stage 26, the counter 27 of which counts the clock clocks per width of each of the pulses of this signal. Because of the proportionality between the pulse width and the output signal of the controller 29, the number of clock cycles determined by the counter 27 per pulse width represents a digital image of the analog output signal of the PID controller 29.
  • the constant pulse + pulse pause length is determined by the program control stage 26 and is approximately 1 ms at a clock frequency of 4 MHz and when using a 12-bit counter. This means that 1,000 results per second of a maximum of 12 bits, that is 4,096 pieces of information, are available with an accuracy of ⁇ 1d plus the possible error of the converter 30.
  • the differential component of the signal supplied to the PID controller 29 can lead to a certain instability of the digital signal, it is advantageous to supply this signal component to a differential controller 31.
  • the differential component can be divided between the two controllers 29 and 31, or the entire differential component can be routed to the differential controller 31, or the differential controller can be omitted and only the PID controller 29 can be used. Decisive for which of these solutions one chooses will be the ratio between effort on the one hand and sensitivity and reliability on the other hand. However, it should be emphasized that all three solutions are fully functional and deliver satisfactory results.
  • the values of the clock clocks determined by the counter 27 pass from the program control stage 26 into a pulse width / voltage converter 32, in which a voltage corresponding to the respective counter value is generated with reference to a reference voltage obtained from the reference voltage source 25, which voltage corresponds to the compensation current Ik determined.
  • An accuracy of ⁇ 0.001% can easily be achieved here, so that the compensation current corresponds exactly to the level of the counter 27.
  • the output of the differential controller 31 is also connected to the pulse width / voltage converter 32 and supplies it with the higher-frequency components of the useful signal U n .
  • the output of converter 32 is connected to one input of second modulator 21 (FIG. 2), the second input of which is connected to program control stage 26 and the output of which is connected to the input of current / voltage converter 14.
  • the second modulator 21 superimposes the compensation current Ik on the signal of the photodiode 5 in the opposite phase, the time conditions for this superimposition being determined by the program control stage 26.
  • the PID controller 29 changes its output signal and thus the pulse / pause ratio in such a way that the output signal of the stage 18, that is to say the useful signal U n , becomes zero.
  • the state of the counter 27 thus corresponds to the infrared deviation of the monitored room except for the already mentioned possible deviation of ⁇ 1d.
  • the accuracy can be further increased by averaging from a large number of individual values.
  • averaging can be carried out, for example, by the counter 27 or by a microprocessor 33 connected downstream of the program control stage 26.
  • the microprocessor facilitates a sensible coupling of the measuring principle described with a second in a so-called dual detector.
  • the microprocessor 33 which transmits the alarm signal present as a result of the evaluation to the alarm output 10, can check the alarm signal for plausibility and thereby relieve the control center.
  • the compensating electronics make it possible to use a common transmitting / receiving optic. This is because reflections from lenses, mirrors and / or from the infrared window caused on the transmission side, which as a rule exceed the reflection signal of a possible object in the monitoring room by potencies, are suppressed by the control loop.
  • the digitization of the signal offers the possibility of acquiring absolute values of the infrared radiation and thereby enabling real presence detection, and it enables the use of a microprocessor with all of its advantages.
  • the detection of the absolute values of the infrared radiation enables the determination of their sign, that is to say whether there is a positive or negative change in the reflection and thus an object movement towards or away from the detector.
  • the proposed analog / digital converter is considerably cheaper than any commercially available A / D converter with the same resolution.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Burglar Alarm Systems (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)

Abstract

Le detecteur infrarouge présenté comprend un émetteur (4), un récepteur (5) et un circuit d'évaluation (2') présentant des moyens (14 à 18) pour l'obtention d'un signal utile (Un). Le circuit d'évaluation (2') renferme une unité de régulation (29) qui, d'une part, reçoit le signal utile (Un) et, d'autre part, est connectée à la sortie du récepteur (5), cette unité de régulation étant destinée à fournir un signal de compensation (Ik) superposé au signal du récepteur (Ie). Le signal de compensation est choisi de façon que le signal utile (Un) soit régulé à zéro, afin que la sensibilité maximale soit toujours maintenue. Dans une forme d'exécution préférée, un convertisseur analogique/numérique (26, 30) est monté en série avec l'unité de régulation (29), convertisseur qui, d'une part, numérise le signal de l'unité de régulation et, d'autre part, est connecté à un convertisseur numérique/analogique (25, 32) pour fournir une tension correspondant à chacune des valeurs des signaux numériques. Cette tension détermine le signal de compensation (Ik).
EP95917879A 1994-05-30 1995-05-19 Detecteur infrarouge d'intrusion actif Expired - Lifetime EP0711442B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP95917879A EP0711442B1 (fr) 1994-05-30 1995-05-19 Detecteur infrarouge d'intrusion actif

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
EP94108289 1994-05-30
EP94108289 1994-05-30
CH90795 1995-03-31
CH907/95 1995-03-31
CH90795 1995-03-31
EP95917879A EP0711442B1 (fr) 1994-05-30 1995-05-19 Detecteur infrarouge d'intrusion actif
PCT/CH1995/000112 WO1995033248A1 (fr) 1994-05-30 1995-05-19 Detecteur infrarouge d'intrusion actif

Publications (2)

Publication Number Publication Date
EP0711442A1 true EP0711442A1 (fr) 1996-05-15
EP0711442B1 EP0711442B1 (fr) 1999-09-22

Family

ID=25686074

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95917879A Expired - Lifetime EP0711442B1 (fr) 1994-05-30 1995-05-19 Detecteur infrarouge d'intrusion actif

Country Status (8)

Country Link
US (1) US5675150A (fr)
EP (1) EP0711442B1 (fr)
JP (1) JPH09501253A (fr)
CN (1) CN1088225C (fr)
CA (1) CA2166389C (fr)
DE (1) DE59506883D1 (fr)
IL (1) IL113653A (fr)
WO (1) WO1995033248A1 (fr)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09186574A (ja) * 1995-12-28 1997-07-15 Nec Corp 検出機能付き端末装置
EP0845765A1 (fr) 1996-12-02 1998-06-03 Cerberus Ag Système de détection d'intrusions
DE19709805A1 (de) * 1997-03-10 1998-09-24 Stribel Gmbh Raumüberwachungsgerät
US6768504B2 (en) 2001-03-31 2004-07-27 Videojet Technologies Inc. Device and method for monitoring a laser-marking device
JP3959461B2 (ja) * 2002-01-31 2007-08-15 オプテックス株式会社 能動型赤外線センサ
US20040004577A1 (en) * 2002-04-29 2004-01-08 Forster Ian J. Flexible curtain antenna for reading RFID tags
DE10236937A1 (de) * 2002-08-12 2004-02-26 BSH Bosch und Siemens Hausgeräte GmbH Elektrisches Gerät
US6812466B2 (en) * 2002-09-25 2004-11-02 Prospects, Corp. Infrared obstacle detection in the presence of sunlight
WO2005045473A1 (fr) * 2003-11-10 2005-05-19 Omron Corporation Dispositif de traitement et dispositif de detection d'objets
US7616109B2 (en) * 2006-03-09 2009-11-10 Honeywell International Inc. System and method for detecting detector masking
DE102008004419A1 (de) * 2008-01-14 2009-07-16 Elmos Semiconductor Ag Beleuchtungsvorrichtung als Außenbeleuchtung und Verfahren zu deren Steuerung
US8384559B2 (en) 2010-04-13 2013-02-26 Silicon Laboratories Inc. Sensor device with flexible interface and updatable information store
EP2453426B2 (fr) 2010-11-15 2021-03-17 Cedes AG Capteur de surveillance doté d'un autotest
EP2631674A1 (fr) * 2012-02-23 2013-08-28 ELMOS Semiconductor AG Procédé et système de capteur destinés à la mesure des propriétés d'une voie de transmission d'un système de mesure entre émetteur et récepteur
CN105046860B (zh) * 2015-09-14 2018-04-13 北京世纪之星应用技术研究中心 一种利用光波多普勒效应的入侵探测系统和方法
CN107367340B (zh) * 2017-06-21 2023-11-14 陈中杰 红外光力矩监控系统
CN111025416A (zh) * 2018-10-09 2020-04-17 众智光电科技股份有限公司 红外线感测装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2452794C3 (de) * 1974-11-07 1979-08-30 Philips Patentverwaltung Gmbh, 2000 Hamburg Automatische Pegeleinstellschaltung für voreinstellbare IR-Puls-Überwachungsgeräte mit getaktetem Empfänger
DE3045217C2 (de) * 1980-12-01 1986-08-07 Brown, Boveri & Cie Ag, 6800 Mannheim Verfahren und Vorrichtung zur optischen Überwachung und Sicherung von Räumen gegen Eindringlinge
DE3618693A1 (de) * 1985-06-12 1986-12-18 Yoshida Kogyo K.K., Tokio/Tokyo Verfahren und vorrichtung zur feststellung der anwesenheit eines menschlichen koerpers
GB8529585D0 (en) * 1985-11-30 1986-01-08 Casswell P H Active infra red detector

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9533248A1 *

Also Published As

Publication number Publication date
IL113653A (en) 1998-10-30
CN1088225C (zh) 2002-07-24
EP0711442B1 (fr) 1999-09-22
DE59506883D1 (de) 1999-10-28
US5675150A (en) 1997-10-07
CN1129042A (zh) 1996-08-14
IL113653A0 (en) 1995-08-31
CA2166389A1 (fr) 1995-12-07
WO1995033248A1 (fr) 1995-12-07
JPH09501253A (ja) 1997-02-04
CA2166389C (fr) 2004-07-13

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