WO1986000988A1 - A fibre-optic cable responsive to microbending forces - Google Patents
A fibre-optic cable responsive to microbending forces Download PDFInfo
- Publication number
- WO1986000988A1 WO1986000988A1 PCT/SE1985/000265 SE8500265W WO8600988A1 WO 1986000988 A1 WO1986000988 A1 WO 1986000988A1 SE 8500265 W SE8500265 W SE 8500265W WO 8600988 A1 WO8600988 A1 WO 8600988A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- fibre
- cable
- sheathing
- contact surfaces
- cable according
- Prior art date
Links
- 239000000835 fiber Substances 0.000 claims abstract description 46
- 230000000737 periodic effect Effects 0.000 claims abstract description 13
- 230000005855 radiation Effects 0.000 claims description 2
- 239000013307 optical fiber Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L11/00—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00
- G01L11/02—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00 by optical means
- G01L11/025—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00 by optical means using a pressure-sensitive optical fibre
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
- G01D5/35338—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using other arrangements than interferometer arrangements
- G01D5/35341—Sensor working in transmission
- G01D5/35345—Sensor working in transmission using Amplitude variations to detect the measured quantity
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
- G01D5/3537—Optical fibre sensor using a particular arrangement of the optical fibre itself
- G01D5/35377—Means for amplifying or modifying the measured quantity
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
- G01L1/242—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre
- G01L1/243—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre using means for applying force perpendicular to the fibre axis
- G01L1/245—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre using means for applying force perpendicular to the fibre axis using microbending
Definitions
- the present invention relates to a fibre-optic cable responsive to microbending forces, for detecting pressure by mechanically influencing the fibre in the cable by means of a so-called periodic disturbance upon transmission of light through the fibre.
- the light passing through the fibre is attenuated, which can be indicated, for example, with the aid of a photoelectric sensor.
- Various fibre parameters affect the attenuation of the light.
- the periodic disturbance has a critical period length which produces maximum attenuation. This period length can be expressed as
- the object of the present invention is to provide a cable for determining pressure, in which the periodic disturbance can be obtained with simple elements which afford stability to the periodic disturbance when the cable is subjected to pressure.
- the cable according to the invention has the characterizing features set forth in the following claims.
- Figure 1 illustrates a first embodiment of a fibre-optic cable according to the invention
- Figure 2 illustrates a second embodiment
- Figure 3 illustrates a third embodiment of the cable according to the invention.
- Figure 1 is a sectional view of a cable according to the invention for detecting a pressure P applied to the casing H of the cable.
- the pressure P may be punctiform or distributed uniformly over the casing H.
- the optical fibre incorporated in the cable comprises a core C, a core-sheathing M and a surrounding layer H, the so-called primary shield, the refractive index of which is chosen to be slightly higher than the refractive index of the core-sheathing.
- a light source Located at one end of the fibre cable is a light source, while at its other end there is arranged a photosensor (not shown), light being transmitted through the fibre F with a given mode distribution.
- the light source and sensor may also be located at one and the same end of the fibre, and a reflector arranged at the other end thereof.
- a mechanical disturbance is introduced into the fibre.
- this disturbance can be introduced by permitting the pressure force P to act upon the primary shield H ( Figure 1), while in the case of a plastics fibre it is sufficient for the pressure force P to act directly on the core-sheathing M.
- the disturbance is intended to create periodic deformation of the fibre. This disturbance is created in the fibre incorporated in the cable according to Figure 1 with the aid of an elongated deformed filament-element in the form of a double-filament structure comprising two twisted filaments Tl and T2.
- the filaments are twisted relatively firmly, so as not to be displaced axially in relation to one another to any appreciable extent when the pressure P is applied to the primary shield H.
- the double-filament structure Tl, T2 is placed straight along the fibre and parallel therewith.
- the double-filament structure Tl, T2 comprising said twisted filaments is wound helically around the fibre F.
- the pressure force P may be directed towards the surrounding core-sheathing M from various directions around the fibre, since the given deformation of the filament structure Tl, T2 ensures that a pressure force is exerted against the core-sheating M.
- the longitudinal deforming element comprises a rigid or an elastic twisted band B, which is wound around the fibre.
- the cable construction according to the present invention distinguishes from the prior art constructions in that the elongated element extended longi ⁇ tudinally around the optical fibre is deformed initially, from the start, so that a periodic disturbance is able to occur upon contact of said element with the fibre.
- the advantage gained hereby resides in that greater freedeom is obtained in disposing the disturbance-creating element between the cable casing and the fibre, and therewith greater possibility of reducing the cross-sectional dimensions of the whole cable, when it is to be used as a pressure sensing device.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE8585903433T DE3564618D1 (en) | 1984-07-20 | 1985-06-27 | A fibre-optic cable responsive to microbending forces |
NO860737A NO166255C (en) | 1984-07-20 | 1986-02-27 | FIBEROPTIC CABLE RESPONSIBLE FOR MICROBOOE CANCER. |
FI860975A FI75049C (en) | 1984-07-20 | 1986-03-10 | MIKROBOEJKAENSLIG FIBEROPTISK KABEL. |
DK127586A DK156975C (en) | 1984-07-20 | 1986-03-19 | POWER TRUCK WITH A FIBEROPTIC CABLE |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8403811-6 | 1984-07-20 | ||
SE8403811A SE443656B (en) | 1984-07-20 | 1984-07-20 | MICROBOOK LIKE OPTICAL FIBER CABLE |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1986000988A1 true WO1986000988A1 (en) | 1986-02-13 |
Family
ID=20356579
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE1985/000265 WO1986000988A1 (en) | 1984-07-20 | 1985-06-27 | A fibre-optic cable responsive to microbending forces |
Country Status (11)
Country | Link |
---|---|
US (1) | US4795232A (en) |
EP (1) | EP0188512B1 (en) |
JP (1) | JPS61502785A (en) |
AU (1) | AU575196B2 (en) |
CA (1) | CA1265945A (en) |
DE (1) | DE3564618D1 (en) |
DK (1) | DK156975C (en) |
FI (1) | FI75049C (en) |
NO (1) | NO166255C (en) |
SE (1) | SE443656B (en) |
WO (1) | WO1986000988A1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2183026B (en) * | 1985-11-14 | 1989-11-22 | Battelle Development Corp | Fiber-optical pressure detector |
EP0379650A1 (en) * | 1989-01-23 | 1990-08-01 | SICOM Gesellschaft für Sensor- und Vorspanntechnik mbH | Fibre optical sensor for small tensile or compression forces |
FR2650670A1 (en) * | 1989-08-02 | 1991-02-08 | Fiori Costantino | System for detecting a fire or any other phenomenon generating an abnormal rise or fall in temperature with respect to a fixed reference |
EP0419267A1 (en) * | 1989-09-21 | 1991-03-27 | Herga Electric Limited | Signal sensing and measuring in fibre optic systems |
WO1993025866A1 (en) * | 1992-06-05 | 1993-12-23 | Monash University | Sensing patches utilising incorporated waveguide sensor |
Families Citing this family (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4927232A (en) * | 1985-03-18 | 1990-05-22 | G2 Systems Corporation | Structural monitoring system using fiber optics |
AU597937B2 (en) * | 1985-03-18 | 1990-06-14 | G2 Systems Corporation | Structural monitoring system using fiber optics |
CH666552A5 (en) * | 1986-03-06 | 1988-07-29 | Suisse Electronique Microtech | MICRO-CURVED FIBER OPTIC SENSOR. |
AU579041B2 (en) * | 1986-05-09 | 1988-11-10 | Thomas & Betts Corporation | Method of and apparatus for fiber optic sensing |
US5023845A (en) * | 1988-10-31 | 1991-06-11 | The United States Of America As Represented By The Secretary Of The Navy | Embedded fiber optic beam displacement sensor |
SE468229B (en) * | 1989-10-02 | 1992-11-23 | Survoir Ltd | OPTICAL FIBER CABLE FOR DETECTING A TEMPERATURE CHANGE |
US5056884A (en) * | 1990-04-10 | 1991-10-15 | Automatic Toll Systems, Inc. | Fiber optic load sensing device |
US5165003A (en) * | 1991-06-28 | 1992-11-17 | Sumitomo Electric Fiber Optics Corp. | Optical fiber cable including interlocking stitch binder |
SE502778C2 (en) * | 1993-10-14 | 1996-01-08 | Ericsson Telefon Ab L M | Optical fiber for use as a sensor and method for producing an optical fiber for use as a sensor |
US5551484A (en) * | 1994-08-19 | 1996-09-03 | Charboneau; Kenneth R. | Pipe liner and monitoring system |
US5694497A (en) * | 1995-06-19 | 1997-12-02 | The United States Of America As Represented By The Secretary Of The Navy | Intrinsically self deforming fiber optic microbend pressure and strain sensor |
US6429421B1 (en) | 2000-01-21 | 2002-08-06 | Luna Innovations, Inc. | Flexible fiber optic microbend device, with interlocking flexible fibers, sensors, and method use |
JP2007064716A (en) * | 2005-08-30 | 2007-03-15 | Hitachi Cable Ltd | Collision detection sensor |
JP4891620B2 (en) * | 2006-01-17 | 2012-03-07 | 日立電線株式会社 | Impact detection sensor |
JP4809680B2 (en) * | 2006-01-17 | 2011-11-09 | 日立電線株式会社 | Impact detection sensor |
JP4923960B2 (en) * | 2006-10-31 | 2012-04-25 | 日立電線株式会社 | Shock detection optical fiber sensor |
US10843290B2 (en) * | 2015-01-19 | 2020-11-24 | Weatherford Technology Holdings, Llc | Acoustically enhanced optical cables |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2023542A1 (en) * | 1970-05-14 | 1971-11-25 | Leonische Drahtwerke Ag | Fibre optics cable-flexible and light conducting |
GB2058394A (en) * | 1979-08-30 | 1981-04-08 | Marconi Co Ltd | Pressure-sensitive Optical Fibre Cable |
US4342907A (en) * | 1977-12-12 | 1982-08-03 | Pedro B. Macedo | Optical sensing apparatus and method |
EP0066493A1 (en) * | 1981-05-15 | 1982-12-08 | Schlumberger Limited | Pressure wave fiber optic transducer cable |
EP0082820A2 (en) * | 1981-12-21 | 1983-06-29 | Battelle Memorial Institute | Optical fibre pressure detector |
DE3211828A1 (en) * | 1982-03-31 | 1983-10-13 | Philips Patentverwaltung Gmbh, 2000 Hamburg | Pressure-measuring device |
US4421979A (en) * | 1981-08-27 | 1983-12-20 | Trw Inc. | Microbending of optical fibers for remote force measurement |
GB2125572A (en) * | 1982-08-03 | 1984-03-07 | Standard Telephones Cables Ltd | Optical fibre sensors |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3750058A (en) * | 1971-12-08 | 1973-07-31 | Bell Telephone Labor Inc | Waveguide structure utilizing compliant helical support |
US4226504A (en) * | 1976-03-15 | 1980-10-07 | Akzona Incorporated | Protection of optical fibers |
US4488040A (en) * | 1982-11-19 | 1984-12-11 | Gte Products Corporation | Fiber optic sensor |
-
1984
- 1984-07-20 SE SE8403811A patent/SE443656B/en not_active IP Right Cessation
-
1985
- 1985-06-27 WO PCT/SE1985/000265 patent/WO1986000988A1/en active IP Right Grant
- 1985-06-27 US US06/847,660 patent/US4795232A/en not_active Expired - Lifetime
- 1985-06-27 DE DE8585903433T patent/DE3564618D1/en not_active Expired
- 1985-06-27 EP EP85903433A patent/EP0188512B1/en not_active Expired
- 1985-06-27 JP JP60503217A patent/JPS61502785A/en active Granted
- 1985-06-27 AU AU46367/85A patent/AU575196B2/en not_active Expired
- 1985-07-17 CA CA000486945A patent/CA1265945A/en not_active Expired
-
1986
- 1986-02-27 NO NO860737A patent/NO166255C/en unknown
- 1986-03-10 FI FI860975A patent/FI75049C/en not_active IP Right Cessation
- 1986-03-19 DK DK127586A patent/DK156975C/en not_active IP Right Cessation
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2023542A1 (en) * | 1970-05-14 | 1971-11-25 | Leonische Drahtwerke Ag | Fibre optics cable-flexible and light conducting |
US4342907A (en) * | 1977-12-12 | 1982-08-03 | Pedro B. Macedo | Optical sensing apparatus and method |
GB2058394A (en) * | 1979-08-30 | 1981-04-08 | Marconi Co Ltd | Pressure-sensitive Optical Fibre Cable |
EP0066493A1 (en) * | 1981-05-15 | 1982-12-08 | Schlumberger Limited | Pressure wave fiber optic transducer cable |
US4421979A (en) * | 1981-08-27 | 1983-12-20 | Trw Inc. | Microbending of optical fibers for remote force measurement |
EP0082820A2 (en) * | 1981-12-21 | 1983-06-29 | Battelle Memorial Institute | Optical fibre pressure detector |
DE3211828A1 (en) * | 1982-03-31 | 1983-10-13 | Philips Patentverwaltung Gmbh, 2000 Hamburg | Pressure-measuring device |
GB2125572A (en) * | 1982-08-03 | 1984-03-07 | Standard Telephones Cables Ltd | Optical fibre sensors |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2183026B (en) * | 1985-11-14 | 1989-11-22 | Battelle Development Corp | Fiber-optical pressure detector |
EP0379650A1 (en) * | 1989-01-23 | 1990-08-01 | SICOM Gesellschaft für Sensor- und Vorspanntechnik mbH | Fibre optical sensor for small tensile or compression forces |
FR2650670A1 (en) * | 1989-08-02 | 1991-02-08 | Fiori Costantino | System for detecting a fire or any other phenomenon generating an abnormal rise or fall in temperature with respect to a fixed reference |
EP0419267A1 (en) * | 1989-09-21 | 1991-03-27 | Herga Electric Limited | Signal sensing and measuring in fibre optic systems |
US5138152A (en) * | 1989-09-21 | 1992-08-11 | Herga Electric Limited | Signal sensing and measuring in fibre optic systems with light pulse width detecting |
WO1993025866A1 (en) * | 1992-06-05 | 1993-12-23 | Monash University | Sensing patches utilising incorporated waveguide sensor |
Also Published As
Publication number | Publication date |
---|---|
DK156975C (en) | 1990-03-19 |
FI860975A0 (en) | 1986-03-10 |
NO166255B (en) | 1991-03-11 |
DK156975B (en) | 1989-10-23 |
US4795232A (en) | 1989-01-03 |
SE8403811D0 (en) | 1984-07-20 |
DK127586D0 (en) | 1986-03-19 |
FI75049B (en) | 1987-12-31 |
FI75049C (en) | 1988-04-11 |
SE443656B (en) | 1986-03-03 |
FI860975A (en) | 1986-03-10 |
NO860737L (en) | 1986-02-27 |
EP0188512A1 (en) | 1986-07-30 |
CA1265945A (en) | 1990-02-20 |
NO166255C (en) | 1991-06-19 |
DK127586A (en) | 1986-03-19 |
JPS61502785A (en) | 1986-11-27 |
EP0188512B1 (en) | 1988-08-24 |
DE3564618D1 (en) | 1988-09-29 |
AU575196B2 (en) | 1988-07-21 |
AU4636785A (en) | 1986-02-25 |
SE8403811L (en) | 1986-01-21 |
JPH0570772B2 (en) | 1993-10-05 |
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