FR2421375A1 - Optical fibre fracture detector - utilises laser to transmit pulse for reflection to time measuring circuit - Google Patents

Optical fibre fracture detector - utilises laser to transmit pulse for reflection to time measuring circuit

Info

Publication number
FR2421375A1
FR2421375A1 FR7809225A FR7809225A FR2421375A1 FR 2421375 A1 FR2421375 A1 FR 2421375A1 FR 7809225 A FR7809225 A FR 7809225A FR 7809225 A FR7809225 A FR 7809225A FR 2421375 A1 FR2421375 A1 FR 2421375A1
Authority
FR
France
Prior art keywords
reflection
time measuring
optical fibre
measuring circuit
fracture
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
FR7809225A
Other languages
French (fr)
Other versions
FR2421375B3 (en
Inventor
Muguette Fraise
Luc Jeunhomme
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 FR7809225A priority Critical patent/FR2421375A1/en
Publication of FR2421375A1 publication Critical patent/FR2421375A1/en
Application granted granted Critical
Publication of FR2421375B3 publication Critical patent/FR2421375B3/fr
Granted legal-status Critical Current

Links

Classifications

    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

The fracture in fibre optic is detected by a probe in which a laser transmits light for reflection by the fracture. A power supply (4) controlled by a driver circuit (6) causes diode laser (2) to emit linearly polarised pulse of incident light. This passes through an objective (8) to a coupler (10) for focussing (12) on the face of the optical fibre (16). Light reflected by the fracture returns via a focussing analyser (18) which allows selected light to pass to receiver (22) via another objective lens (20). Time measuring circuit (24) determines the required distance.
FR7809225A 1978-03-30 1978-03-30 Optical fibre fracture detector - utilises laser to transmit pulse for reflection to time measuring circuit Granted FR2421375A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7809225A FR2421375A1 (en) 1978-03-30 1978-03-30 Optical fibre fracture detector - utilises laser to transmit pulse for reflection to time measuring circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7809225A FR2421375A1 (en) 1978-03-30 1978-03-30 Optical fibre fracture detector - utilises laser to transmit pulse for reflection to time measuring circuit

Publications (2)

Publication Number Publication Date
FR2421375A1 true FR2421375A1 (en) 1979-10-26
FR2421375B3 FR2421375B3 (en) 1980-10-17

Family

ID=9206438

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7809225A Granted FR2421375A1 (en) 1978-03-30 1978-03-30 Optical fibre fracture detector - utilises laser to transmit pulse for reflection to time measuring circuit

Country Status (1)

Country Link
FR (1) FR2421375A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0661566A1 (en) * 1993-12-27 1995-07-05 Nec Corporation Two-way line monitor
CN103282759A (en) * 2010-11-15 2013-09-04 西门子能量股份有限公司 Sensor apparatus for detecting and monitoring a crack propagating through a structure

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9213156B2 (en) * 2011-08-17 2015-12-15 Source Photonics, Inc. Optical receiver with reduced cavity size and methods of making and using the same

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0661566A1 (en) * 1993-12-27 1995-07-05 Nec Corporation Two-way line monitor
US5537500A (en) * 1993-12-27 1996-07-16 Nec Corporation Two-way line monitor
CN103282759A (en) * 2010-11-15 2013-09-04 西门子能量股份有限公司 Sensor apparatus for detecting and monitoring a crack propagating through a structure

Also Published As

Publication number Publication date
FR2421375B3 (en) 1980-10-17

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