CA2549810A1 - Optical fiber sensor and method - Google Patents
Optical fiber sensor and method Download PDFInfo
- Publication number
- CA2549810A1 CA2549810A1 CA 2549810 CA2549810A CA2549810A1 CA 2549810 A1 CA2549810 A1 CA 2549810A1 CA 2549810 CA2549810 CA 2549810 CA 2549810 A CA2549810 A CA 2549810A CA 2549810 A1 CA2549810 A1 CA 2549810A1
- Authority
- CA
- Canada
- Prior art keywords
- optical fiber
- fiber sensor
- peripheral
- cores
- central core
- 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
- 239000013307 optical fiber Substances 0.000 title claims abstract 28
- 238000000034 method Methods 0.000 title claims 3
- 230000002093 peripheral effect Effects 0.000 claims abstract 20
- 230000007935 neutral effect Effects 0.000 claims abstract 15
- 238000005253 cladding Methods 0.000 claims abstract 12
- 238000005452 bending Methods 0.000 claims 6
- 230000000694 effects Effects 0.000 claims 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
- G01B11/18—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge using photoelastic elements
-
- 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
- G01D5/35306—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 an interferometer arrangement
- G01D5/35309—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 an interferometer arrangement using multiple waves interferometer
- G01D5/35316—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 an interferometer arrangement using multiple waves interferometer using a Bragg gratings
-
- 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
- G01M11/08—Testing mechanical properties
- G01M11/083—Testing mechanical properties by using an optical fiber in contact with the device under test [DUT]
- G01M11/086—Details about the embedment of the optical fiber within the DUT
-
- 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
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29346—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by wave or beam interference
- G02B6/2935—Mach-Zehnder configuration, i.e. comprising separate splitting and combining means
- G02B6/29352—Mach-Zehnder configuration, i.e. comprising separate splitting and combining means in a light guide
-
- 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
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02042—Multicore optical fibres
-
- 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
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02057—Optical fibres with cladding with or without a coating comprising gratings
- G02B6/02076—Refractive index modulation gratings, e.g. Bragg gratings
- G02B6/02195—Refractive index modulation gratings, e.g. Bragg gratings characterised by means for tuning the grating
- G02B6/022—Refractive index modulation gratings, e.g. Bragg gratings characterised by means for tuning the grating using mechanical stress, e.g. tuning by compression or elongation, special geometrical shapes such as "dog-bone" or taper
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Optics & Photonics (AREA)
- Optical Transform (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
An optical fiber sensor for detecting curvature of a body/structure comprises a cladding having an outer periphery. A central core receives and transmits light.
The central core has Bragg gratings and is positioned in neutral planes of the cladding. Peripheral cores receive and transmit light. The peripheral cores have Bragg gratings and are peripherally positioned in the cladding with respect to the neutral planes. A connection configuration is provided in the outer periphery of the cladding to attach the optical fiber sensor to a body/structure such that the central core and the peripheral cores are in a predetermined orientation with respect to the body/structure to measure curvature of the body/structure.
The central core has Bragg gratings and is positioned in neutral planes of the cladding. Peripheral cores receive and transmit light. The peripheral cores have Bragg gratings and are peripherally positioned in the cladding with respect to the neutral planes. A connection configuration is provided in the outer periphery of the cladding to attach the optical fiber sensor to a body/structure such that the central core and the peripheral cores are in a predetermined orientation with respect to the body/structure to measure curvature of the body/structure.
Claims (13)
1. An optical fiber sensor for detecting curvature of a body/structure, comprising:
a cladding having an outer periphery;
a central core for receiving and transmitting light, the central core having Bragg gratings and being positioned in a first neutral plane of the cladding, such that the Bragg gratings of the central core are generally insensitive to bending about a first axis associated with the first neutral plane and sensitive to temperature variations;
at least one peripheral core for receiving and transmitting light, the at least one peripheral core having Bragg gratings and being peripherally positioned in the cladding with respect to the first neutral plane such that the Bragg gratings of the at least one peripheral core are sensitive to bending about the first axis and to temperature variations; and a connection configuration in the outer periphery of the cladding to attach the optical fiber sensor to a body/structure such that the central core and the at least one peripheral core are in a predetermined position and orientation with respect to the body/structure, so as to measure curvature of the body/structure about at least the first axis independently of the effect of temperature variations by associating the Bragg wavelengths of the central core and of the at least one peripheral core.
a cladding having an outer periphery;
a central core for receiving and transmitting light, the central core having Bragg gratings and being positioned in a first neutral plane of the cladding, such that the Bragg gratings of the central core are generally insensitive to bending about a first axis associated with the first neutral plane and sensitive to temperature variations;
at least one peripheral core for receiving and transmitting light, the at least one peripheral core having Bragg gratings and being peripherally positioned in the cladding with respect to the first neutral plane such that the Bragg gratings of the at least one peripheral core are sensitive to bending about the first axis and to temperature variations; and a connection configuration in the outer periphery of the cladding to attach the optical fiber sensor to a body/structure such that the central core and the at least one peripheral core are in a predetermined position and orientation with respect to the body/structure, so as to measure curvature of the body/structure about at least the first axis independently of the effect of temperature variations by associating the Bragg wavelengths of the central core and of the at least one peripheral core.
2. The optical fiber sensor according to claim 1, wherein the cladding has a generally circular cross-section.
3. The optical fiber sensor according to claim 2, wherein the connector configuration has two diametrically opposed flat surfaces defined along the cladding in the outer periphery, with the first neutral plane being coplanar with a plane of symmetry of the optical fiber sensor, the plane of symmetry being parallel to the two diametrically opposed flat surfaces.
4. The optical fiber sensor according to claim 1, wherein the Bragg gratings in the central core and the at least one peripheral core are longitudinally aligned in sets along the optical fiber sensor.
5. The optical fiber sensor according to claim 4, wherein the Bragg gratings in each of the sets have a different Bragg wavelength, with each Bragg wavelength being associated with a position along the optical fiber sensor.
6. The optical fiber sensor according to claim 1, comprising two of the peripheral cores, with Bragg gratings in the central core and the two peripheral cores being longitudinally aligned in sets along the optical fiber sensor.
7. The optical fiber sensor according to claim 1, comprising two of the peripheral cores and wherein a first of the two peripheral cores and the central core lie in the first neutral plane, a second of the two peripheral cores and the central core lie in a second neutral plane associated with a second axis, with the first neutral plane and the second neutral plane being perpendicular to one another, such that only the first peripheral core is sensitive to bending about the second axis, and only the second peripheral core is sensitive to bending about the first axis.
8. The optical fiber sensor according to claim 7, wherein the connector configuration has two diametrically opposed flat surfaces defined along the cladding in the outer periphery.
9. The optical fiber sensor according to claim 8, wherein the flat surfaces are parallel to the first neutral plane and perpendicular to the second neutral plane.
10. The optical fiber sensor according to claim 1, comprising four of the peripheral cores, with Bragg gratings in the central core and the four peripheral cores being longitudinally aligned in sets along the optical fiber sensor.
11. The optical fiber sensor according to claim 10, wherein a first pair of the four peripheral cores and the central core lie in the first neutral plane, a second pair of the four peripheral cores and the central core lie in a second neutral plane associated with a second axis, with the first plane and the second plane being perpendicular to one another, such that only the first pair is sensitive to bending about the second axis, and only the second pair is sensitive to bending about the first axis.
12. A method for measuring curvature in a body, comprising the steps of:
providing an optical fiber sensor having at least two cores in a cladding, a plurality of longitudinal sets of Bragg gratings being provided in the cores at known locations along the optical fiber sensor, each Bragg grating having a different Bragg wavelength;
positioning the optical fiber sensor on a body in a known position and orientation;
emitting light in the optical fiber sensor;
receiving light from the optical fiber sensor;
measuring the Bragg wavelengths from the light received from the optical fiber sensor; and calculating the curvature of the body by associating the measured Bragg wavelengths to the known locations in the cores so as to obtain the curvature of the optical fiber sensor with respect to the known position and orientation.
providing an optical fiber sensor having at least two cores in a cladding, a plurality of longitudinal sets of Bragg gratings being provided in the cores at known locations along the optical fiber sensor, each Bragg grating having a different Bragg wavelength;
positioning the optical fiber sensor on a body in a known position and orientation;
emitting light in the optical fiber sensor;
receiving light from the optical fiber sensor;
measuring the Bragg wavelengths from the light received from the optical fiber sensor; and calculating the curvature of the body by associating the measured Bragg wavelengths to the known locations in the cores so as to obtain the curvature of the optical fiber sensor with respect to the known position and orientation.
13. The method according to claim 12, wherein one of the at least two cores is positioned in a neutral plane with respect to a first axis of curvature of the optical fiber sensor, wherein the step of calculating the curvature of the body comprises decoupling temperature-induced Bragg wavelength variations from the calculated curvature about the first axis of curvature by associating the measured Bragg wavelengths of the at least two cores.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2549810A CA2549810C (en) | 2006-06-08 | 2006-06-08 | Optical fiber sensor and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2549810A CA2549810C (en) | 2006-06-08 | 2006-06-08 | Optical fiber sensor and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2549810A1 true CA2549810A1 (en) | 2007-12-08 |
| CA2549810C CA2549810C (en) | 2010-11-09 |
Family
ID=38792303
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2549810A Expired - Fee Related CA2549810C (en) | 2006-06-08 | 2006-06-08 | Optical fiber sensor and method |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2549810C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2426466A1 (en) * | 2010-09-07 | 2012-03-07 | KROHNE Messtechnik GmbH | Deflection measuring device using the interferometry principle |
-
2006
- 2006-06-08 CA CA2549810A patent/CA2549810C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2426466A1 (en) * | 2010-09-07 | 2012-03-07 | KROHNE Messtechnik GmbH | Deflection measuring device using the interferometry principle |
| JP2012058241A (en) * | 2010-09-07 | 2012-03-22 | Krohne Messtechnik Gmbh | Deflection measuring device using interferometric principle |
| US8687199B2 (en) | 2010-09-07 | 2014-04-01 | Krohne Messtechnik Gmbh | Deflection measuring device according to the interferometer principle |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2549810C (en) | 2010-11-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20070297712A1 (en) | Optical fiber sensor and method | |
| RU2013146857A (en) | FIBER OPTICAL SENSOR BASED ON THE CONNECTED PHOTON-CRYSTAL LAMINATED ELEMENTS, SYSTEM AND METHOD OF MANUFACTURE AND APPLICATION | |
| US11644632B2 (en) | Method for manufacturing optical device | |
| CN106959077A (en) | A kind of universal bend sensor of multi-core fiber grating | |
| CN102620858B (en) | Double long period fiber grating (LPFG) temperature and humidity sensor | |
| CN210268995U (en) | Blade pressure monitoring system based on optical fiber sensor and blade | |
| CA2600621A1 (en) | Multi-core strain compensated optical fiber temperature sensor | |
| CN100367016C (en) | Fibre-optical temperature measuring device and measurement thereof | |
| CA2695587A1 (en) | Physical quantity measuring apparatus utilizing optical frequency domain reflectometry and method for temperature and strain measurement using the apparatus | |
| KR101148987B1 (en) | Package for filmed optical-fiber Bragg grating sensor which can evaluate multi-axial strain | |
| WO2018025851A3 (en) | Optical fiber evaluation method and optical fiber evaluation device | |
| WO2008111320A1 (en) | Optical fiber sensor | |
| WO2009072274A1 (en) | Optical fiber sensor | |
| JP2019522228A5 (en) | ||
| JP2007024527A (en) | Optical fiber sensor and sensor system | |
| JP2012159640A (en) | Single core bidirectional optical communication module and manufacturing method thereof | |
| US9857250B2 (en) | Strain sensor and method for installing strain sensor | |
| CN105571750A (en) | Distributed pressure sensing system | |
| CN114878858B (en) | Building inhaul cable swinging acceleration measuring device and method based on multi-core fiber bragg grating | |
| CN109855555B (en) | Optical fiber bending sensor capable of realizing axial strain compensation | |
| CN101846492B (en) | Interferometer combined by double F-P chambers and Mach-Zehnder | |
| US20160282207A1 (en) | Fiber-optic sensor assembly | |
| CA2549810A1 (en) | Optical fiber sensor and method | |
| CN114034261B (en) | Miniaturized three-way fiber bragg grating strain sensor | |
| CN205655805U (en) | It combines prague fiber grating camber sensor to interfere based on covering mode |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20220301 |
|
| MKLA | Lapsed |
Effective date: 20200831 |