FR2422945A1 - Optical fibre fracture detector - utilises laser injecting light for reflection to receiver and time measuring circuit - Google Patents

Optical fibre fracture detector - utilises laser injecting light for reflection to receiver and time measuring circuit

Info

Publication number
FR2422945A1
FR2422945A1 FR7810722A FR7810722A FR2422945A1 FR 2422945 A1 FR2422945 A1 FR 2422945A1 FR 7810722 A FR7810722 A FR 7810722A FR 7810722 A FR7810722 A FR 7810722A FR 2422945 A1 FR2422945 A1 FR 2422945A1
Authority
FR
France
Prior art keywords
receiver
optical fibre
reflection
measuring circuit
pulse
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
FR7810722A
Other languages
French (fr)
Other versions
FR2422945B1 (en
Inventor
Jean-Paul Pocholle
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.)
Alcatel Lucent SAS
Original Assignee
Compagnie Generale dElectricite 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 Compagnie Generale dElectricite SA filed Critical Compagnie Generale dElectricite SA
Priority to FR7810722A priority Critical patent/FR2422945A1/en
Publication of FR2422945A1 publication Critical patent/FR2422945A1/en
Application granted granted Critical
Publication of FR2422945B1 publication Critical patent/FR2422945B1/fr
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/241—Light guide terminations
    • 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
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/25—Preparing the ends of light guides for coupling, e.g. cutting
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/262—Optical details of coupling light into, or out of, or between fibre ends, e.g. special fibre end shapes or associated optical elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4201—Packages, e.g. shape, construction, internal or external details
    • G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
    • G02B6/4207—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms with optical elements reducing the sensitivity to optical feedback

Abstract

Fracture at a distance from an accessible end of an optical fibre is detected by injecting light from a laser. A receiver reduces effect of reflection from the fibre optic front face. A pilot circuit controls a generator which provides a pulse to cause the laser (2) to emit a light pulse. An input objective lens (8) forms parallel beam to pass through an inclined semitransparent blade (10) for focussing (12) onto a front face (14) of optical fibre (16). A focussing lens (12) reforms reflected light into parallel beam and the reflecting blade directs it via a focussing lens (20) to the receiver (22). A tome measuring circuit (24) measures time interval between receiver output and pulse from pilot circuit to determine the distance.
FR7810722A 1978-04-12 1978-04-12 Optical fibre fracture detector - utilises laser injecting light for reflection to receiver and time measuring circuit Granted FR2422945A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7810722A FR2422945A1 (en) 1978-04-12 1978-04-12 Optical fibre fracture detector - utilises laser injecting light for reflection to receiver and time measuring circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7810722A FR2422945A1 (en) 1978-04-12 1978-04-12 Optical fibre fracture detector - utilises laser injecting light for reflection to receiver and time measuring circuit

Publications (2)

Publication Number Publication Date
FR2422945A1 true FR2422945A1 (en) 1979-11-09
FR2422945B1 FR2422945B1 (en) 1980-10-10

Family

ID=9207002

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7810722A Granted FR2422945A1 (en) 1978-04-12 1978-04-12 Optical fibre fracture detector - utilises laser injecting light for reflection to receiver and time measuring circuit

Country Status (1)

Country Link
FR (1) FR2422945A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2537280A1 (en) * 1982-12-03 1984-06-08 Thomson Csf Device for measuring transmission parameters of an optical fibre by the back-scattering method
EP0442202A2 (en) * 1990-02-13 1991-08-21 AT&T Corp. Method of producing apparatus comprising a low-reflection optical fiber connection

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2280072A1 (en) * 1974-07-26 1976-02-20 Douillie Remy MEASUREMENT PROCEDURE AND EQUIPMENT FOR LOCATING A BREAKAGE ON AN OPTICAL CABLE
DE2546269A1 (en) * 1975-10-16 1977-04-21 Licentia Gmbh Optical measuring device for detection of faults - tests otpical fibres and has mirror transparent in its centre to give split beam
US4021121A (en) * 1974-10-30 1977-05-03 Siemens Aktiengesellschaft Method and apparatus for measuring the distance of a discontinuity of a glass fiber from one end of the fiber
DE2620357A1 (en) * 1976-05-06 1977-11-17 Aeg Telefunken Kabelwerke Optical fibre attenuation measurement - using transmitted and reflected pulse energy comparison in UV, visible and IR regions

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2280072A1 (en) * 1974-07-26 1976-02-20 Douillie Remy MEASUREMENT PROCEDURE AND EQUIPMENT FOR LOCATING A BREAKAGE ON AN OPTICAL CABLE
US4021121A (en) * 1974-10-30 1977-05-03 Siemens Aktiengesellschaft Method and apparatus for measuring the distance of a discontinuity of a glass fiber from one end of the fiber
DE2546269A1 (en) * 1975-10-16 1977-04-21 Licentia Gmbh Optical measuring device for detection of faults - tests otpical fibres and has mirror transparent in its centre to give split beam
DE2620357A1 (en) * 1976-05-06 1977-11-17 Aeg Telefunken Kabelwerke Optical fibre attenuation measurement - using transmitted and reflected pulse energy comparison in UV, visible and IR regions

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
EXBK/77 *
NV2219/75 *
NV2219/76 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2537280A1 (en) * 1982-12-03 1984-06-08 Thomson Csf Device for measuring transmission parameters of an optical fibre by the back-scattering method
EP0442202A2 (en) * 1990-02-13 1991-08-21 AT&T Corp. Method of producing apparatus comprising a low-reflection optical fiber connection
EP0442202A3 (en) * 1990-02-13 1992-07-29 American Telephone And Telegraph Company Method of producing apparatus comprising a low-reflection optical fiber connection

Also Published As

Publication number Publication date
FR2422945B1 (en) 1980-10-10

Similar Documents

Publication Publication Date Title
JPS5640737A (en) Damage detector for optical fiber for laser power transmission
EP0207960A4 (en) Delivery system for high-energy pulsed ultraviolet laser light.
EP0347215A3 (en) Proximity sensor
DE69317957D1 (en) Device for generating laser beams
GB1532980A (en) Systems for measuring the distance of interference sources from one end of a glass fibre
GB1438191A (en) Coupling device for an optical waveguide and a method for manufact uring such a device
US6910658B1 (en) Underwater detection system
SE8700469L (en) FITTING DEVICE FOR A LIGHT CELL THAT DOES NOT EXPOSE VISIBLE LASER LIGHT
FR2422945A1 (en) Optical fibre fracture detector - utilises laser injecting light for reflection to receiver and time measuring circuit
JPS5687818A (en) Reflex type position detector
EP0130337A3 (en) Optical measurement apparatus
FR2421375A1 (en) Optical fibre fracture detector - utilises laser to transmit pulse for reflection to time measuring circuit
JPH0619432B2 (en) Liquid level measuring device
JPS5773633A (en) Light pulse testing device
DE3566303D1 (en) Light coupling device for the optical reflectometry
JPS5779472A (en) Optical fiber probe for laser doppler velocimeter
JPS57129037A (en) Optical transmission device
JPS57120242A (en) Optical information reproducing device
KR0126798B1 (en) Optical location detector
JPS56151336A (en) Fault locating device for optical fibers cable
RU2020133315A (en) Lidar system and method with coherent detection
JPS643536A (en) Instrument for measuring refractive index of waveguide
JPS6410224A (en) Laser device
JPS55163471A (en) Measuring device for range displacement
JPS6419539A (en) Optical head

Legal Events

Date Code Title Description
ST Notification of lapse