EP0200186B1 - Barrière photoélectrique - Google Patents

Barrière photoélectrique Download PDF

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Publication number
EP0200186B1
EP0200186B1 EP86105818A EP86105818A EP0200186B1 EP 0200186 B1 EP0200186 B1 EP 0200186B1 EP 86105818 A EP86105818 A EP 86105818A EP 86105818 A EP86105818 A EP 86105818A EP 0200186 B1 EP0200186 B1 EP 0200186B1
Authority
EP
European Patent Office
Prior art keywords
radiation
light barrier
polarization
polarization filter
barrier system
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
EP86105818A
Other languages
German (de)
English (en)
Other versions
EP0200186A3 (en
EP0200186A2 (fr
Inventor
Kurt Müller
Peter Wägli
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.)
Cerberus 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 AT86105818T priority Critical patent/ATE64023T1/de
Publication of EP0200186A2 publication Critical patent/EP0200186A2/fr
Publication of EP0200186A3 publication Critical patent/EP0200186A3/de
Application granted granted Critical
Publication of EP0200186B1 publication Critical patent/EP0200186B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL 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
    • G08B13/183—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 interruption of a radiation beam or barrier

Definitions

  • the invention relates to a light barrier with a radiation source and a radiation sensor acted upon by its radiation with at least two sensor elements, means for polarizing the radiation and radiation filters differently polarized in front of the two sensor elements being provided, and the two sensor elements being connected to one another in an evaluation circuit, which different radiation of the two sensor elements emits a signal.
  • Such light barriers are known for example from DE 1 934 321 or from DE 2 014 107 and are preferably used for intrusion protection.
  • the evaluation circuit triggers an alarm signal.
  • a polarization of the radiation emanating from the radiation source and the arrangement of a similar polarization filter in front of one of the sensor elements, the other sensor element absorbing radiation that is not polarized or polarized differently, ensures that the evaluation circuit does not emit an output signal when the radiation sensor is exposed to external radiation, for example solar radiation or Scattered light is struck, the polarization of which deviates from the type of polarization of the light barrier radiation or which is unpolarized, which should normally be the case, since in this case both sensor elements are acted upon equally.
  • Such light barriers can also be used for outdoor applications in daylight.
  • the immunity to interference can be further improved by using alternating radiation of a specific frequency and tuning the evaluation circuit to this frequency.
  • a synchronization of the radiation source and the evaluation circuit has also already been described.
  • the radiation source must be connected to the radiation sensor or the circuit, so that usually an autocollimation arrangement with a spatially adjacent radiation source and radiation sensors, as well as a reflector arranged at a distance therefrom and very sensitive to contamination and misalignment is provided.
  • the range of these light barriers i.e. the safely manageable length of the monitoring path is therefore quite limited.
  • the invention has for its object to eliminate the aforementioned disadvantages of the prior art and in particular to create a light barrier, which also Outdoor applications and the presence of extraneous light as well as weather-related radiation scattering with a greater range and improved interference immunity can reliably detect an object to be detected, for example an intruder with greater sensitivity.
  • this object is achieved in that the radiation consists of two spatially offset radiation branches with different, mutually independent polarization, and that the radiation from the two radiation branches with different polarization is directed to one sensor element each.
  • radiation for example infrared or light radiation, preferably infrared with a wavelength of approximately 0.9 ⁇ m, is emitted by a radiation source 1, for example a commercially available light-emitting diode (LED), and by means of a lens 2 in the direction of the monitoring path 3 bundled.
  • a polarization filter 4 is arranged after the lens 2 and is divided into two halves with different polarization by a preferably vertical parting plane. The polarization in the two halves is independent of one another, ie radiation of one type of polarization is extinguished by the other half of the filter, and vice versa.
  • This divided polarization filter divides the radiation in the monitoring section 3 into two radiation branches 31 and 32 with correspondingly different polarization.
  • the two radiation branches partially, but not completely, overlap and are arranged next to one another, preferably horizontally next to one another.
  • the radiation from the two radiation branches 3 1 and 3 2 reaches a further polarization filter 5, which is divided into two halves and corresponds exactly to the first filter 4 with respect to the type of polarization, and two half lenses 6 1 and 6 2, which are separated by an aperture 7 and have the same separation plane as the polarization filter 5, each on a sensor element 81 or 82 of a dual radiation sensor 8, the spectral sensitivity of the radiation source 1 corresponds.
  • the radiation sensor element 8 1 receives exclusively radiation from the branch 3 1, which has been passed through by the polarization filter part 4 1, since the portion that was supplied by the other half 4 2 through that Polarization filter part 5 1 is absorbed, and vice versa, only radiation from the filter part 4 2 from the radiation branch 3 2 reaches the sensor element 8 2.
  • a clean separation of the two radiation branches is achieved, even if only relatively simple and inexpensive optical elements are used, so that a particularly large usable range of the light barrier can be achieved in a particularly simple manner, without the inevitable divergence of the radiation branches having a disruptive effect.
  • the two sensor elements 8 1 and 8 2 are connected to an evaluation circuit 9, which is designed, for example, as a differential circuit and emits a signal corresponding to the difference in the irradiation between the two elements. Due to an unpolarized or otherwise polarized external radiation, For example, sunlight or daylight, radiation is applied to both sensor elements in the same way and the evaluation circuit 9 does not emit a signal, ie extraneous radiation of this type is automatically eliminated. If radiation-scattering mist occurs in the monitoring section 3, the irradiation of both sensor elements 8 1, 8 2 is also influenced in the same way, so that no difference occurs here and the differential circuit 9 does not pass on a signal.
  • an evaluation circuit 9 Due to an unpolarized or otherwise polarized external radiation, For example, sunlight or daylight, radiation is applied to both sensor elements in the same way and the evaluation circuit 9 does not emit a signal, ie extraneous radiation of this type is automatically eliminated. If radiation-scattering mist occurs in the monitoring section 3, the irradiation of
  • the security of detection and the selectivity for an intruder can be further improved in that the evaluation circuit is designed in such a way that the signals supplied by the two sensor elements 8 1 and 8 2 must occur with a certain time difference from one another, for example within a predetermined time window, and with a certain intensity, or with other suitable criteria to trigger an alarm.
  • the evaluation circuit is designed in such a way that the signals supplied by the two sensor elements 8 1 and 8 2 must occur with a certain time difference from one another, for example within a predetermined time window, and with a certain intensity, or with other suitable criteria to trigger an alarm.
  • further information can be obtained from the signals, for example about the size and speed of the detected object.
  • the first, half-divided polarization filter 10 is arranged between the radiation source 1 and the lens 2, and the further polarization filter 11 between the half lenses 6 1, 6 2 and the radiation sensor 8.
  • the polarization filters can also be applied directly to the surfaces, i.e. the front or the back of the lens 2, or the half lenses 61 and 62 be applied. It is also possible to form the lens 2 from differently polarized parts made of polarizing material or to assemble this lens into zones with different polarization, the respective lenses on the receiver side being designed and constructed analogously.
  • the radiation branches can e.g. can also be provided in a different way.
  • they can be designed as a central part and as a ring concentrically surrounding them, and the radiation sensor accordingly with a radiation-sensitive zone in the center and a second radiation-sensitive zone surrounding it in a ring. This means that you no longer have to pay attention to the orientation during assembly.
  • FIG. 3 shows a polarization filter 4 or 5, or 10 or 11, which is divided by a vertical dividing line 12 into two halves 13 and 14 with different polarization.
  • the polarization is linear in both halves, namely in one half 13 in the vertical direction and in the other half orthogonally to it in the horizontal direction. Both types of polarization are therefore independent of one another, i.e. Radiations polarized in this way cancel each other out.
  • a linear polarization is also provided, but the two directions of polarization in the halves 13 and 14 are inclined approximately 45 ° to the horizontal or vertical. Since natural external radiation, e.g. solar radiation or sky light, if at all noteworthy, then almost are always preferably polarized either vertically or horizontally, their influence on the two sensor elements only sensitized to 45 ° polarized radiation is the same and is eliminated by the evaluation circuit.
  • the two halves 13 and 14 are not linear, but circularly polarizing.
  • the two halves have an opposite direction of rotation, i.e. the part 13 is counterclockwise and the part 14 is clockwise circularly polarizing. This also largely eliminates external radiation or makes it ineffective.
  • the dividing line 12 of the two halves 13 and 14 of the polarization filters 4 and 5 does not necessarily have to run vertically. However, the division must ensure that steel branches are formed, which are penetrated by an intruder in succession with a certain measurable time difference.
  • FIG. 6 shows an example of a suitable evaluation circuit, in which the two sensor elements 8 1 and 8 2 are designed as phototransistors Ph, which are connected to the associated resistors in an emitter follower circuit and feed their output signal via a preamplifier 15 or 16 to a sample and hold circuit .
  • the radiation source is preferably operated as a pulse emitter with a certain pulse frequency for reasons of interference immunity, and the preamplifiers are designed to be frequency-selective
  • the two sample and hold circuits 17 and 18 store the maxima of the pulses for a short time and pass them to a differential circuit 19 further, and on the other hand deliver a signal to a monitoring circuit 20 if the input pulses fail or their intensity drops below a given threshold, and indicate a fault or attempted sabotage.
  • the positive input of the differential circuit 19 is controlled by one sensor element 8 1 and the negative input by the other sensor element 8 2, a positive signal or a negative signal appears at the output of the differential circuit 19, depending on which sensor element has undergone a change in irradiation. If an object crosses the two radiation branches one after the other, a positive and a negative pulse appear in succession at short intervals.
  • the output signals of the differential circuit 19 are each fed to a positive and negative threshold value detector 21, 22, which forward the signals to two cross-connected OR gates 23, 24, provided that their intensity exceeds the predetermined threshold values.
  • the OR gates 23 and 24 give a start pulse to the start input of a counter and time window comparator 25 and the second positive or negative pulse to the stop input of this counter 25.
  • the minimum time can also be chosen to be zero, although a finite minimum time offers greater security.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Burglar Alarm Systems (AREA)
  • Luminescent Compositions (AREA)
  • Glass Compositions (AREA)
  • Liquid Crystal (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Claims (10)

  1. Relais photoélectrique pour la détection d'une effraction, comportant une source de rayonnement (1) et un détecteur de rayonnement (8) chargé par le rayonnement de cette source et comportant au moins deux éléments de détection (8¹,8²), et dans lequel un premier filtre de polarisation (4) servant à polariser le rayonnement est placé dans le trajet du rayonnement et un second filtre de polarisation (5) est prévu en amont des deux éléments de détection (8¹,8²), qui sont raccordés dans un circuit d'évaluation (9) qui délivre un signal lorsque les deux éléments de détection (8¹,8²) sont irradiés différemment, caractérisé par le fait que la source de rayonnement (1) et le détecteur de rayonnement (8) sont disposés sur des côtés différents de la section de contrôle (3), que le premier filtre de polarisation (4) est agencé de telle sorte qu'il apparaît, dans la section de contrôle (3), deux branches de rayonnement (3¹,3²), qui sont décalées dans l'espace l'une par rapport à l'autre et comportent des polarisations différentes, indépendantes l'une de l'autre, et que le second filtre de polarisation (5) est agencé de telle sorte que le rayonnement possédant une polarisation différente et provenant des deux branches de rayonnement (3¹,3²) est dirigé respectivement sur l'un des deux éléments de détection (8¹,8²).
  2. Relais photoélectrique suivant la revendication 1, caractérisé par le fait qu'il est prévu, du côté de la source de rayonnement et du côté du détecteur de rayonnement, un filtre respectif de polarisation (4,5), qui possède deux surfaces partielles (13,14) qui polarisent linéairement le rayonnement, les plans de polarisation des deux surfaces partielles (13,14) étant perpendiculaires entre eux.
  3. Relais photoélectrique suivant la revendication 2, caractérisé par le fait que les plans de polarisation des deux surfaces partielles (13,14) sont inclinés de 45° par rapport à l'horizontale.
  4. Relais photoélectrique suivant la revendication 1, caractérisé par le fait qu'il est prévu, du côté de la source de rayonnement et du côté du détecteur de rayonnement, un filtre respectivement de polarisation (4,5), qui comporte deux surfaces partielles (12,14), qui polarisent le rayonnement circulairement avec des sens de rotation opposés.
  5. Relais photoélectrique suivant l'une des revendications 1 à 4, caractérisé par le fait que deux branches de rayonnement (3¹,3²), qui sont décalées spatialement l'une par rapport à l'autre, se recouvrent partiellement, mais pas complètement.
  6. Relais photoélectrique suivant l'une des revendications 1 à 5, caractérisé par le fait que les branches de rayonnement (3¹,3²), qui sont décalées spatialement l'une par rapport à l'autre, sont disposées horizontalement cote-àcôte.
  7. Relais photoélectrique suivant l'une des revendications 1 à 5, caractérisé par le fait que les branches de rayonnement (3¹,3²), qui sont décalées spatialement l'une par rapport à l'autre, sont concentriques.
  8. Relais photoélectrique suivant l'une des revendications 1 à 7, caractérisé par le fait que le circuit d'évaluation (9) comporte un circuit différenciateur (19), qui délivre un signal en fonction de la différence des signaux de sortie des éléments de détection (8¹,8²).
  9. Relais photoélectrique suivant la revendication 8, caractérisé par la fait que le circuit d'évaluation (9) comporte des circuits à valeurs de seuil (21,22) qui retransmettent un signal lorsque le signal de sortie du circuit différenciateur (19) dépasse ou tombe au-dessous de valeurs de seuil prédéterminées.
  10. Relais photoélectrique suivant l'une des revendications 8 et 9, caractérisé par le fait que le circuit d'évaluation (9) possède un comparateur de fenêtres temporelles (25), qui déclenche un signal d'alarme lorsqu'après l'apparition du signal d'un élément de détection (8¹,8²), pendant un intervalle de temps prédéterminé par une valeur minimale et une valeur maximale, un signal est délivré par l'autre élément de détection (8¹,8²).
EP86105818A 1985-04-30 1986-04-26 Barrière photoélectrique Expired - Lifetime EP0200186B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86105818T ATE64023T1 (de) 1985-04-30 1986-04-26 Lichtschranke.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1825/85 1985-04-30
CH1825/85A CH667340A5 (de) 1985-04-30 1985-04-30 Lichtschranke.

Publications (3)

Publication Number Publication Date
EP0200186A2 EP0200186A2 (fr) 1986-11-05
EP0200186A3 EP0200186A3 (en) 1987-01-21
EP0200186B1 true EP0200186B1 (fr) 1991-05-29

Family

ID=4219477

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86105818A Expired - Lifetime EP0200186B1 (fr) 1985-04-30 1986-04-26 Barrière photoélectrique

Country Status (5)

Country Link
US (1) US4734575A (fr)
EP (1) EP0200186B1 (fr)
AT (1) ATE64023T1 (fr)
CH (1) CH667340A5 (fr)
DE (1) DE3679443D1 (fr)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3641926C1 (de) * 1986-12-09 1988-04-28 Sick Optik Elektronik Erwin Autokollimationslichtvorhang
DE3733656C1 (de) * 1987-10-05 1989-02-02 Hoermann Kg Reflexionslichtschranke
EP0388352A1 (fr) * 1989-03-15 1990-09-19 Elesta Ag Elektronik Dispositif pour barrière optique à une seule direction
NL8902314A (nl) * 1989-09-15 1991-04-02 Michiel Kassies Werkwijze en inrichting voor het detecteren van een voorwerp.
US5955854A (en) * 1992-09-29 1999-09-21 Prospects Corporation Power driven venting of a vehicle
US6316762B1 (en) * 1997-11-07 2001-11-13 Leuze Electronic Gmbh & Co. Optoelectronic device
DE102004017183A1 (de) * 2004-04-07 2005-11-10 Siemens Ag Gesamtsystem, insbesondere medizinische Anlage
SG189800A1 (en) * 2008-04-17 2013-05-31 Shilat Optronics Ltd Intrusion warning system
EP3396416A1 (fr) * 2008-11-25 2018-10-31 Tetravue, Inc. Systèmes et procédés d'imagerie tridimensionnelle à haute résolution
JP5458813B2 (ja) * 2009-11-10 2014-04-02 オムロン株式会社 光電センサ
EP2813868B1 (fr) * 2013-06-11 2021-08-04 Rockwell Automation Switzerland GmbH Procédé de synchronisation d'unités optiques d'une barrière photoélectrique et rideau de lumière
CN106464858B (zh) 2014-04-26 2019-08-20 泰特拉维公司 用于3d成像中的深度感测的耐用且延伸的照明波形的方法和系统
DE102014013326A1 (de) * 2014-09-15 2016-03-17 Imos Gubela Gmbh Optisches Sensorsystem
CN108780142B (zh) 2016-02-29 2023-10-31 恩耐股份有限公司 3d成像系统和方法
US11212512B2 (en) 2017-12-28 2021-12-28 Nlight, Inc. System and method of imaging using multiple illumination pulses

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2457502A (en) * 1944-08-09 1948-12-28 Shepherd Judson O'd Signal system employing polarized light
US3440427A (en) * 1966-04-12 1969-04-22 Philips Corp Remote control system with a unitary cell bridge circuit
GB1214981A (en) * 1967-05-05 1970-12-09 John Horrocks Control means using light filters
DE1946993A1 (de) * 1969-09-17 1971-03-25 Sick Erwin Fa Lichtschranke fuer analoge Messzwecke
US4333008A (en) * 1975-04-21 1982-06-01 Sanders Associates, Inc. Polarization coded doublet laser detection system
FR2347666A1 (fr) * 1976-04-09 1977-11-04 France Etat Photoelasticimetre automatique a deux longueurs d'ondes
US4342987A (en) * 1979-09-10 1982-08-03 Rossin Corporation Intruder detection system
US4339660A (en) * 1980-05-15 1982-07-13 Erwin Sick Gmbh Optik-Elektronik Reflection light barrier apparatus for recognizing both strongly and weakly reflecting objects

Also Published As

Publication number Publication date
US4734575A (en) 1988-03-29
ATE64023T1 (de) 1991-06-15
EP0200186A3 (en) 1987-01-21
CH667340A5 (de) 1988-09-30
EP0200186A2 (fr) 1986-11-05
DE3679443D1 (de) 1991-07-04

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