FR2520114B1 - - Google Patents

Info

Publication number
FR2520114B1
FR2520114B1 FR8200655A FR8200655A FR2520114B1 FR 2520114 B1 FR2520114 B1 FR 2520114B1 FR 8200655 A FR8200655 A FR 8200655A FR 8200655 A FR8200655 A FR 8200655A FR 2520114 B1 FR2520114 B1 FR 2520114B1
Authority
FR
France
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
Application number
FR8200655A
Other languages
French (fr)
Other versions
FR2520114A1 (en
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.)
Lignes Telegraphiques et Telephoniques LTT SA
Original Assignee
Lignes Telegraphiques et Telephoniques LTT 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 Lignes Telegraphiques et Telephoniques LTT SA filed Critical Lignes Telegraphiques et Telephoniques LTT SA
Priority to FR8200655A priority Critical patent/FR2520114A1/en
Publication of FR2520114A1 publication Critical patent/FR2520114A1/en
Application granted granted Critical
Publication of FR2520114B1 publication Critical patent/FR2520114B1/fr
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
    • G01M11/30—Testing of optical devices, constituted by fibre optics or optical waveguides
    • G01M11/31—Testing of optical devices, constituted by fibre optics or optical waveguides with a light emitter and a light receiver being disposed at the same side of a fibre or waveguide end-face, e.g. reflectometers
    • G01M11/3109—Reflectometers detecting the back-scattered light in the time-domain, e.g. OTDR
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
    • G01M11/30—Testing of optical devices, constituted by fibre optics or optical waveguides
    • G01M11/39—Testing of optical devices, constituted by fibre optics or optical waveguides in which light is projected from both sides of the fiber or waveguide end-face
    • 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
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H04B10/071—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using a reflected signal, e.g. using optical time domain reflectometers [OTDR]

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Burglar Alarm Systems (AREA)
FR8200655A 1982-01-18 1982-01-18 Optical fibre fracture location for perimeter surveillance - measures interruption time difference for simultaneously transmitted optical signals Granted FR2520114A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR8200655A FR2520114A1 (en) 1982-01-18 1982-01-18 Optical fibre fracture location for perimeter surveillance - measures interruption time difference for simultaneously transmitted optical signals

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8200655A FR2520114A1 (en) 1982-01-18 1982-01-18 Optical fibre fracture location for perimeter surveillance - measures interruption time difference for simultaneously transmitted optical signals

Publications (2)

Publication Number Publication Date
FR2520114A1 FR2520114A1 (en) 1983-07-22
FR2520114B1 true FR2520114B1 (en) 1984-08-24

Family

ID=9270052

Family Applications (1)

Application Number Title Priority Date Filing Date
FR8200655A Granted FR2520114A1 (en) 1982-01-18 1982-01-18 Optical fibre fracture location for perimeter surveillance - measures interruption time difference for simultaneously transmitted optical signals

Country Status (1)

Country Link
FR (1) FR2520114A1 (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8520827D0 (en) * 1985-08-20 1985-09-25 York Ventures & Special Optica Fibre-optic sensing devices
GB8709900D0 (en) * 1987-04-27 1987-08-05 British Telecomm Surveillance system
GB8710833D0 (en) * 1987-05-07 1987-06-10 Porous Plastics Ltd Microwave heating
JPH01141331A (en) * 1987-11-27 1989-06-02 Anritsu Corp Optical pulse tester
AUPQ012699A0 (en) * 1999-05-03 1999-05-27 Future Fibre Technologies Pty Ltd Intrinsic securing of fibre optic communication links
GB2409942A (en) * 2004-01-12 2005-07-13 Radiodetection Ltd Optical time domain reflectometry with non-intrusive modulators
WO2010034988A1 (en) * 2008-09-23 2010-04-01 Schlumberger Holdings Limited Redundant optical fiber system and method for remotely monitoring the condition of a pipeline
CN101441129B (en) * 2008-12-25 2010-06-09 哈尔滨工程大学 Optical fiber ring performance measuring and evaluating system based on temperature experiment
GB201020827D0 (en) 2010-12-08 2011-01-19 Fotech Solutions Ltd Distrubuted optical fibre sensor
GB2490179B (en) * 2011-06-01 2013-04-24 Detection Technologies Ltd Security system, controller for a security system, transducing cable for a security system and method for detecting a disturbance and determining its location

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1518390A (en) * 1976-03-30 1978-07-19 Farmaceutici Italia Doxorubicin thioesters
GB1497995A (en) * 1976-04-13 1978-01-12 Standard Telephones Cables Ltd Fibre optic acoustic monitoring arrangement
FR2393287A1 (en) * 1977-05-31 1978-12-29 Cables De Lyon Geoffroy Delore ECHOMETER FOR LOCATING FAULTS AFFECTING LIGHT CONDUCTORS

Also Published As

Publication number Publication date
FR2520114A1 (en) 1983-07-22

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Legal Events

Date Code Title Description
ST Notification of lapse