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 circuitInfo
- 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
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.
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)
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)
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 |
-
1978
- 1978-03-30 FR FR7809225A patent/FR2421375A1/en active Granted
Cited By (3)
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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