EP0088721A1 - Verfahren zum Detektieren der Unterbrechung der Übertragung von Lichtsignalen und Vorrichtung dafür - Google Patents

Verfahren zum Detektieren der Unterbrechung der Übertragung von Lichtsignalen und Vorrichtung dafür Download PDF

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Publication number
EP0088721A1
EP0088721A1 EP83810053A EP83810053A EP0088721A1 EP 0088721 A1 EP0088721 A1 EP 0088721A1 EP 83810053 A EP83810053 A EP 83810053A EP 83810053 A EP83810053 A EP 83810053A EP 0088721 A1 EP0088721 A1 EP 0088721A1
Authority
EP
European Patent Office
Prior art keywords
receiver
loop
transmitter
light
light conductor
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
EP83810053A
Other languages
English (en)
French (fr)
Other versions
EP0088721B1 (de
Inventor
Jean-Pierre Wiedmer
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.)
Cabloptic SA
Original Assignee
Cabloptic 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 Cabloptic SA filed Critical Cabloptic SA
Priority to AT83810053T priority Critical patent/ATE19834T1/de
Publication of EP0088721A1 publication Critical patent/EP0088721A1/de
Application granted granted Critical
Publication of EP0088721B1 publication Critical patent/EP0088721B1/de
Expired legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/02—Mechanical actuation
    • G08B13/12—Mechanical actuation by the breaking or disturbance of stretched cords or wires
    • G08B13/126—Mechanical actuation by the breaking or disturbance of stretched cords or wires for a housing, e.g. a box, a safe, or a room
    • G08B13/128—Mechanical actuation by the breaking or disturbance of stretched cords or wires for a housing, e.g. a box, a safe, or a room the housing being an electronic circuit unit, e.g. memory or CPU chip
    • 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
    • G08B13/183—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
    • G08B13/186—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 using light guides, e.g. optical fibres

Definitions

  • the present invention relates to a method for detecting the interruption of the transmission of light signals transmitted through a loop of a light conductor, into which optical signals are injected by means of a transmitter at one end of the light conductor. light of this loop, and in which the signals transmitted by the light conductor and emitted by the other end of the light conductor of this loop are detected by means of a receiver.
  • Optical fiber is increasingly used to convey a light signal, the interruption of which triggers an alarm device in surveillance or protection systems.
  • the light signals are injected at one end of the fiber and picked up by a detector at the other end of this fiber.
  • the signal interruption observed at the reception level may be due to the break of the circuit, but also to a failure of the components when transmitting the signal, upon reception or during decoding.
  • Known devices are unfortunately not able to make a selection between the different causes of the signal interruption.
  • the present invention proposes to overcome this drawback by proposing a method and by producing a device making it possible to instantly determine the cause of the interruption of the light signal.
  • the method according to the invention is characterized in that the light signal is sent simultaneously from the transmitter to the receiver through the loop and through a direct circuit connecting the transmitter to the receiver, so that for each signal sent by the transmitter, the receiver picks up a first signal transmitted through the loop and a second signal transmitted through the direct circuit, and in that the interruption of the transmission of the light signals is detected by detecting the cessation of the simultaneous reception of the first and the second signal normally received by the receiver.
  • the device according to the invention is characterized in that it comprises a direct circuit mounted between the transmitter and the receiver, this direct circuit being arranged to transmit to the receiver a signal emitted by the transmitter without crossing the loop of the light conductor , so that the receiver receives substantially simultaneously, for each signal transmitted by the transmitter, two signals transmitted respectively through the loop and the direct circuit.
  • the device according to the invention also has the advantages of being compact, of particularly economical construction and of robust construction.
  • the device described essentially comprises a transparent block 10 comprising two identical elements 11 and 12 and having the shape of a rectangular parallelepiped. These two blocks are juxtaposed clamped one against the other by clamping members (not shown), so that one of the planar faces 13 of the element It is in firm support against one of the planar faces 13 ' of element 12.
  • Element 11 preferably made of transparent synthetic resin, is molded around the end 14 of a sheathed optical fiber 15, and the element 12 is molded around the end 16 of a sheathed optical fiber 17.
  • the ends of fibers 14 and 16 preferably constitute the ends of the same optical fiber forming a loop surrounding a building or a site to be monitored. However, these fiber ends may belong to different fibers linked together by known suitable means.
  • a transmitter 18 preferably constituted by a light emitting diode 19 and an optical coupler 20, the support 21 of which is fixed, for example by bonding, on the input face of the element 11.
  • a receiver 22 arranged to detect on the one hand the light signal transmitted by the end 16 of the optical fiber 17, and on the other hand the light signal schematically represented by the ray 23 emitted by the emitter 18 through the transparent block 10.
  • the receiver 22 receives, alternately, a light signal transmitted through this loop and a light signal transmitted through the direct circuit, that is to say through the transparent block 10.
  • a decoding device may optionally activate a alarm device when these two signals are not picked up alternately by the receiver 22.
  • Semi-cylindrical cells 24 make it possible to form cylindrical housings, into which centering rods or clamping and fixing screws 25 are introduced (see fig. 2) during the juxtaposed mounting of the two elements 11 and 12. Others fixing means are also suitable.
  • the production of two identical elements 11 and 12 is particularly advantageous in that the whole of the block 10 is designed in a modular fashion and requires only a single mold for the individual production of the elements which compose it.
  • the transmitter and the receiver are preferably attached by simple bonding to the resin.
  • the device comprises a transmitter 31 mounted at the end of a first element 32 serving to support the ends 33 and 34 of two light conductors, preferably optical fibers 35 and 36 which respectively constitute the loop of light conductors and the direct circuit.
  • the circuit also comprises a second element 37 serving to support the ends 38 and 39 of the two optical fibers 35 and 36, and a receiver 40.
  • the direct circuit is constituted by a segment of optical fiber, and the two elements 32 and 37 are dissociated and could be made of a material other than a transparent material, since the function of these elements is only mechanical, the light conduction function being fulfilled by the optical fiber segment 36.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • General Engineering & Computer Science (AREA)
  • Optical Communication System (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
EP83810053A 1982-03-02 1983-02-08 Verfahren zum Detektieren der Unterbrechung der Übertragung von Lichtsignalen und Vorrichtung dafür Expired EP0088721B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83810053T ATE19834T1 (de) 1982-03-02 1983-02-08 Verfahren zum detektieren der unterbrechung der uebertragung von lichtsignalen und vorrichtung dafuer.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1258/82 1982-03-02
CH125882A CH645765A5 (fr) 1982-03-02 1982-03-02 Procede pour detecter l'interruption de la transmission de signaux lumineux et dispositif pour la mise en oeuvre de ce procede.

Publications (2)

Publication Number Publication Date
EP0088721A1 true EP0088721A1 (de) 1983-09-14
EP0088721B1 EP0088721B1 (de) 1986-05-14

Family

ID=4206176

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83810053A Expired EP0088721B1 (de) 1982-03-02 1983-02-08 Verfahren zum Detektieren der Unterbrechung der Übertragung von Lichtsignalen und Vorrichtung dafür

Country Status (7)

Country Link
US (1) US4491984A (de)
EP (1) EP0088721B1 (de)
JP (1) JPS58164341A (de)
AT (1) ATE19834T1 (de)
CA (1) CA1196969A (de)
CH (1) CH645765A5 (de)
DE (1) DE3363463D1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0247940A1 (de) * 1986-05-30 1987-12-02 Commissariat A L'energie Atomique Überwachungsvorrichtung mit Lichtwellenleiter
CN104517376A (zh) * 2014-12-15 2015-04-15 北京航天易联科技发展有限公司 一种两通道嵌入式安防装置

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4612670A (en) * 1984-05-16 1986-09-16 General Dynamics Corporation Electro-optical connection between electronic modules
JPH02127829A (ja) * 1988-11-08 1990-05-16 Fujitsu Ltd 双方向光伝送装置の光断検出回路
DE19832562A1 (de) * 1998-07-20 2000-01-27 Siemens Ag Empfangseinrichtung für eine optische Datenübertragungsstrecke
CN107862821A (zh) * 2017-12-12 2018-03-30 上海师范大学 一种周界安防***

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3714644A (en) * 1970-11-25 1973-01-30 H Hellstrom Alarms for night latch
GB1497995A (en) * 1976-04-13 1978-01-12 Standard Telephones Cables Ltd Fibre optic acoustic monitoring arrangement
GB2044971A (en) * 1978-08-28 1980-10-22 Chubb Electronics Ltd Security alarm systems

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2239063B1 (de) * 1973-07-27 1977-09-16 Thomson Csf

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3714644A (en) * 1970-11-25 1973-01-30 H Hellstrom Alarms for night latch
GB1497995A (en) * 1976-04-13 1978-01-12 Standard Telephones Cables Ltd Fibre optic acoustic monitoring arrangement
GB2044971A (en) * 1978-08-28 1980-10-22 Chubb Electronics Ltd Security alarm systems

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0247940A1 (de) * 1986-05-30 1987-12-02 Commissariat A L'energie Atomique Überwachungsvorrichtung mit Lichtwellenleiter
FR2599532A1 (fr) * 1986-05-30 1987-12-04 Commissariat Energie Atomique Dispositif de surveillance a fibres optiques
CN104517376A (zh) * 2014-12-15 2015-04-15 北京航天易联科技发展有限公司 一种两通道嵌入式安防装置

Also Published As

Publication number Publication date
CH645765A5 (fr) 1984-10-15
ATE19834T1 (de) 1986-05-15
US4491984A (en) 1985-01-01
EP0088721B1 (de) 1986-05-14
CA1196969A (en) 1985-11-19
JPS58164341A (ja) 1983-09-29
DE3363463D1 (en) 1986-06-19

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