EP0388352A1 - Dispositif pour barrière optique à une seule direction - Google Patents

Dispositif pour barrière optique à une seule direction Download PDF

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Publication number
EP0388352A1
EP0388352A1 EP90810116A EP90810116A EP0388352A1 EP 0388352 A1 EP0388352 A1 EP 0388352A1 EP 90810116 A EP90810116 A EP 90810116A EP 90810116 A EP90810116 A EP 90810116A EP 0388352 A1 EP0388352 A1 EP 0388352A1
Authority
EP
European Patent Office
Prior art keywords
transmitters
transmitter
light barrier
receivers
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.)
Withdrawn
Application number
EP90810116A
Other languages
German (de)
English (en)
Inventor
Rainer Dipl.-Ing. Schön
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.)
Elesta AG
Original Assignee
Elesta 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 Elesta AG filed Critical Elesta AG
Publication of EP0388352A1 publication Critical patent/EP0388352A1/fr
Withdrawn legal-status Critical Current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
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL 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

Definitions

  • the invention relates to a one-way light barrier arrangement with a series of monitoring sections or data and / or signal transmission sections, a transmitter and a receiver being provided for each section.
  • the one-way light barrier arrangement contains two types of transmitters and receivers, the first type being a linear polarization filter with a first polarization level and the second type has a linear polarization filter with a second polarization level, which is arranged at an angle to the first polarization level, and that the transmitter and receiver are of the same type for the respective route.
  • first type being a linear polarization filter with a first polarization level
  • second type has a linear polarization filter with a second polarization level, which is arranged at an angle to the first polarization level, and that the transmitter and receiver are of the same type for the respective route.
  • a one-way light barrier arrangement is thus possible, in which all transmitters are arranged on one side and all receivers on the other side if the lines are alternately equipped with one or the other type of transmitters and receivers (FIG. 3). With this arrangement, stray light from the neighboring route does not interfere. Only stray light from a third distance could have a disturbing effect, provided that it is still of sufficient intensity.
  • An embodiment is even more advantageous, which is characterized in that transmitters or receivers are alternately arranged in groups of two on one side or the other side, and that in successive routes the transmitters and receivers are alternately of the first or the second type ( Fig. 4).
  • only the fifth route is in turn configured the same as the first, so that only the receiver of the fifth route could be influenced by stray light from the first route.
  • the fifth route is far away, either no stray light falls on the receiver or the striking stray light is so low in intensity that it has no effect.
  • the angle between the first and the second plane of polarization is advantageously 90 degrees. At this angle, influencing of a receiver of the second type by a transmitter of the first type is practically impossible, because then practically all striking polarized light is filtered out.
  • An advantageous arrangement provides that the even-numbered segments are arranged in a first plane and the odd-numbered segments in a second plane, which extends at a distance parallel to the first plane (FIG. 6). This arrangement is particularly advantageous if the transmitter and receiver have a common fastening axis, which allows such an arrangement.
  • the transmitters S1, S2, S3 are arranged on one side, the receivers E1, E2, E3 on the other side. As shown in dash-dotted lines, there is a risk that stray light from a transmitter, e.g. S1, the receiver, e.g. E2, which can affect the neighboring route.
  • the transmission directions in the known arrangement from FIG. 2 are alternately different.
  • the transmitter S1, the receiver E2 and the transmitter S3 are arranged on the one side, while the receiver E1, the transmitter S2 and the receiver E3 are located on the other side.
  • stray light from one route cannot affect the receiver of the neighboring route.
  • a number of distances D1, D2, D3 ... are again provided.
  • the first type contains a linear polarization filter with a first polarization plane that is indicated with four vertical lines.
  • the second type contains a linear polarization filter with a second polarization plane, which is indicated by four horizontal lines.
  • the second polarization plane is arranged at an angle of 90 degrees to the first polarization plane.
  • the transmitter and the receiver have linear polarization filters with the same polarization level; The transmitter and receiver are thus of the same type.
  • the transmitters S1, S2, S3 ... are arranged on one side and the receivers E1, E2, E3 ...
  • the lines D1, D2, D3 ... are equipped in sequence with transmitters and receivers of one or the other type. It can be seen that, in these circumstances, the transmitter S1, for example, cannot influence the adjacent receiver E2. Scattered light from the transmitter S1 could only influence the receiver E3, which has the same polarization as the transmitter S1.
  • the embodiment of FIG. 3 does not differ from the known prior art according to FIG. 2, but has the advantage that all transmitters can be on one side or all transmitters on the other side, as is appropriate for certain applications.
  • the transmitters S1, S2 are alternately of the first or second type. Furthermore, the transmitters S1, S2 are alternately in groups of two arranged on one or the other side. The groups of two are indicated by brackets.
  • the same also applies to the receivers E1, E2, ... With this arrangement, for example, scattered light from the transmitter S1 cannot influence the adjacent three receivers E2, E3 and E4. Stray light from the transmitter S1 could only fall onto the receiver E5. However, this is hardly the case because the distance from the distance D1 is relatively large. Scattered light that may fall on the receiver E5 is usually of such a low intensity that it has no interference.
  • the embodiment according to FIG. 5 gives the same advantage, where in successive distances D1, D2 ... the transmitters or Receivers are arranged alternately on one side and the other. Again, groups of two transmitters and receivers are provided, the transmitters and receivers being of the same type in such a group of two. The groups of two transmitters and receivers are alternately of the first and the second type, as indicated by the vertical and horizontal lines.
  • the odd-numbered lines are arranged in a first plane P1 and the even-numbered lines in a second plane P2, which extends parallel to the first plane at a distance d.
  • This arrangement is practical if the housing of the transmitter and receiver have a common fastening axis A1 or A2.
  • transmitters S1, S2, ... are alternately of the first or second type. Furthermore, the transmitters S1, S2 are alternately arranged in groups of two on one side or the other. (In the schematic representation above or below in the picture). The same applies to the receivers E1, E2, ... In contrast to FIG. 4, however, the odd-numbered transmitters and receivers are arranged in the level P1 and the even-numbered ones in the level P2.
  • the transmitters S1, S2, ... are alternately arranged on one side or the other. (In the schematic representation above or below in the picture). The same also applies to the receivers E1, E2, ... Furthermore, groups of two transmitters and receivers are alternately of the first or second type. In contrast to FIG. 5, however, the odd-numbered transmitters and receivers are in level P1 and the even-numbered ones in the level P2 arranged.
  • the transmitter and / or receiver which are on one or the other ren side are each arranged in a common housing.
  • the one-way light barrier arrangement in the form of a fork light barrier arrangement. With such a design, the transmitter and receiver can be arranged in a common housing.
  • Fig. 9 shows the structure of a one-way light barrier. This consists of the transmitter S and the receiver E.
  • a stabilized power supply unit 12 which is designed either for the connection of all-current or only alternating current or only direct current.
  • the power supply 12 feeds a transmitter circuit 13, which allows a radiation source 14 to work either with continuous light or pulsed light. Depending on the application, the light emanating from the radiation source 14 is bundled or made slightly divergent or convergent.
  • the front lens 15 is used for this purpose.
  • a linear polarization filter 17 is located between the radiation source 14 and the front lens 15. The linearly polarized light reaches the receiver E via the transmission path d.
  • the receiver E has a housing 21 which is advantageously of the same design as the housing 11 of the transmitter S. Behind the front lens 23 is a linear polarization filter 25, which has the same polarization plane as the polarization filter 17.
  • the photoelectric converter 27, whose output signal is fed to an electronic amplifier 29, is used to receive the incident received light beam.
  • An electronic evaluation stage 31 is connected to the amplifier 29 and is supplied by the stabilized power supply 33.
  • the output 34 which can include a light or dark circuit or an antivalence circuit, experiences a signal change when the photoelectric converter receives a light intensity above a predetermined threshold value.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Optical Communication System (AREA)
EP90810116A 1989-03-15 1990-02-19 Dispositif pour barrière optique à une seule direction Withdrawn EP0388352A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH95889 1989-03-15
CH958/89 1989-03-15

Publications (1)

Publication Number Publication Date
EP0388352A1 true EP0388352A1 (fr) 1990-09-19

Family

ID=4199132

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90810116A Withdrawn EP0388352A1 (fr) 1989-03-15 1990-02-19 Dispositif pour barrière optique à une seule direction

Country Status (1)

Country Link
EP (1) EP0388352A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0629370A1 (fr) * 1993-06-11 1994-12-21 Solar Wide Industrial Ltd. Dispositif de surveillance
FR2801401A1 (fr) * 1999-03-17 2001-05-25 British Telecomm Systeme de detection
EP2012144A1 (fr) * 2007-07-05 2009-01-07 Sick Ag Grille lumineuse et procédé destiné au fonctionnement d'une grille lumineuse
CN113496581A (zh) * 2021-07-27 2021-10-12 广州市正宏泰科贸有限公司 一种协同式红外栅栏入侵探测器

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3440427A (en) * 1966-04-12 1969-04-22 Philips Corp Remote control system with a unitary cell bridge circuit
DE2014107A1 (de) * 1970-03-24 1971-10-14 Sarl Thevon Freres Lichtschranke
EP0200186A2 (fr) * 1985-04-30 1986-11-05 Cerberus Ag Barrière photoélectrique

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3440427A (en) * 1966-04-12 1969-04-22 Philips Corp Remote control system with a unitary cell bridge circuit
DE2014107A1 (de) * 1970-03-24 1971-10-14 Sarl Thevon Freres Lichtschranke
EP0200186A2 (fr) * 1985-04-30 1986-11-05 Cerberus Ag Barrière photoélectrique

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0629370A1 (fr) * 1993-06-11 1994-12-21 Solar Wide Industrial Ltd. Dispositif de surveillance
FR2801401A1 (fr) * 1999-03-17 2001-05-25 British Telecomm Systeme de detection
FR2801400A1 (fr) * 1999-03-17 2001-05-25 British Telecomm Systeme de detection
EP2012144A1 (fr) * 2007-07-05 2009-01-07 Sick Ag Grille lumineuse et procédé destiné au fonctionnement d'une grille lumineuse
CN113496581A (zh) * 2021-07-27 2021-10-12 广州市正宏泰科贸有限公司 一种协同式红外栅栏入侵探测器

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