US20080085073A1 - Dynamic optical waveguide sensor - Google Patents
Dynamic optical waveguide sensor Download PDFInfo
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- US20080085073A1 US20080085073A1 US11/945,418 US94541807A US2008085073A1 US 20080085073 A1 US20080085073 A1 US 20080085073A1 US 94541807 A US94541807 A US 94541807A US 2008085073 A1 US2008085073 A1 US 2008085073A1
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- 230000003287 optical effect Effects 0.000 title claims abstract description 43
- 239000000835 fiber Substances 0.000 claims abstract description 33
- 230000008878 coupling Effects 0.000 claims 3
- 238000010168 coupling process Methods 0.000 claims 3
- 238000005859 coupling reaction Methods 0.000 claims 3
- 238000000034 method Methods 0.000 abstract description 9
- 238000005259 measurement Methods 0.000 description 9
- 230000003068 static effect Effects 0.000 description 7
- 238000005253 cladding Methods 0.000 description 4
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 210000000988 bone and bone Anatomy 0.000 description 3
- 238000009530 blood pressure measurement Methods 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000026683 transduction Effects 0.000 description 1
- 238000010361 transduction Methods 0.000 description 1
Images
Classifications
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- 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
- G01L1/246—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 integrated gratings, e.g. Bragg gratings
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- 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
- G01D5/35303—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 a reference fibre, e.g. interferometric devices
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- 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
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- 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
- G01D5/35354—Sensor working in reflection
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- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optical Transform (AREA)
- Measuring Fluid Pressure (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
Methods and apparatuses that sense physical parameters, such as pressure and strain, using optical waveguide sensors are described. A light source emits light at a predetermined wavelength along an optical waveguide having a fiber Bragg grating optical sensing element. That sensing element reflects light in accord with a sloped -shape function of reflected light amplitude verses wavelength. A receiver converts the reflected light into electrical signals and an analyzer then determines a physical parameter based on changes of amplitude of the reflected light. The analyzer also maintains the wavelength of the light such that the wavelength corresponds to a slope wavelength of the shape function.
Description
- This application is a divisional of U.S. patent application Ser. No. 11/076,706, filed Mar. 10, 2005, now U.S. Pat. No. 7,302,123, which is herein incorporated by reference in its entirety.
- 1. Field of the Invention
- Embodiments of the present invention generally relate to optical waveguide sensors, and more particularly to a fiber Bragg grating optical waveguide sensors that dynamically senses strain induced by a stimuli acting upon a transduction mechanism. Description of the Related Art
- A fiber Bragg grating (FBG) is an optical element that is formed by a photo-induced periodic modulation of the refractive index of an optical waveguide's core. An FBG element is highly reflective to light having wavelengths within a narrow bandwidth that is centered at a wavelength that is referred to as the Bragg wavelength. Other wavelengths pass through the FBG without reflection. The Bragg wavelength itself is dependent on physical parameters, such as temperature and strain, that impact on the refractive index. Therefore, FBG elements can be used as sensors to measure such parameters. After proper calibration, the Bragg wavelength acts is an absolute measure of the physical parameters.
- One way of using fiber Bragg grating elements as sensors is to apply strain from an elastic structure (e.g., a diaphragm, bellows, etc.) to a fiber Bragg grating element. For example, U.S. Pat. No. 6,016,702, issued Jan. 25, 2000, entitled “High Sensitivity Fiber Optic Pressure Sensor for Use in Harsh Environments” by inventor Robert J. Maron discloses an optical waveguide sensor in which a compressible bellows is attached to an optical waveguide at one location while a rigid structure is attached at another. A fiber Bragg grating (FBG) is embedded within the optical waveguide between the compressible bellows and the rigid structure. When an external pressure change compresses the bellows the tension on the fiber Bragg grating is changed, which changes the Bragg wavelength.
- Another example of using fiber Bragg grating elements as pressure sensors is presented in U.S. Pat. No. 6,422,084, issued Jul. 23, 2002, entitled “Bragg Grating Pressure Sensor” by Fernald, et al. That patent discloses optical waveguide sensors in which external pressure longitudinally compresses an optical waveguide having one or more fiber Bragg grating. The optical waveguide can be formed into a “dog bone” shape that includes a fiber Bragg grating and that can be formed under tension or compression to tailor the pressure sensing characteristics of the fiber Bragg grating. Another fiber Bragg grating outside of the narrow portion of the dog bone can provide for temperature compensation.
- While the foregoing pressure sensing techniques are beneficial, those techniques may not be suitable for all applications. Therefore, fiber Bragg grating techniques suitable for dynamically sensing varying parameters such as pressure and strain would be useful. Also useful would be fiber Bragg grating techniques that provide for both static and dynamic measurements of parameters.
- Embodiment of the present invention generally provides for optical waveguide measurement techniques that are suitable for sensing dynamically varying physical parameters such as pressure and strain. Furthermore, embodiments of the present invention also provide for both static and dynamic measurements of physical parameters.
- The foregoing and other objects, features, and advantages of the present invention will become more apparent in light of the following detailed description of exemplary embodiments thereof.
- So that the manner in which the above recited features of the present invention can be understood in detail, more particular descriptions of the invention, briefly summarized above, may be had by reference to embodiments, some of which are illustrated in the appended drawings. It is to be noted, however, that the appended drawings illustrate only typical embodiments of this invention and are therefore not to be considered limiting of its scope, for the invention may admit to other equally effective embodiments.
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FIG. 1 illustrates an optical waveguide sensor having a sequence of sensors disposed along the optical waveguide; -
FIG. 2 illustrates a dog bone pressure sensor having both a fiber Bragg grating pressure sensor and a fiber Bragg grating temperature sensor; -
FIG. 3 illustrates a swept frequency optical waveguide measurement system that can be used for both dynamic and static measurements; -
FIG. 4 schematically illustrates parking a narrow line width laser on the slope of a fiber Bragg grating; and -
FIG. 5 schematically illustrates an optical waveguide AC strain measurement system. - The present invention provides for optical waveguide measurement systems that are suitable for sensing dynamically varying physical parameters such as pressure and strain. Some embodiments of the present invention enable both static and dynamic measurements of physical parameters. Embodiments of the present invention are suitable for use in harsh environments as found in oil and/or gas wells, engines, combustion chambers, etc.
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FIG. 1 illustrates an opticalwaveguide sensor system 100 having a sequence ofsensors 102 disposed along anoptical waveguide 104. Eachsensor 102 includes at least one fiber Bragggrating 106. Depending on the application and the specific configuration, thesensor system 100 can be operated in various ways. For example, atunable light source 108, such as a tunable laser or a broadband light source mated with a tunable filter, can inject light that is swept over a bandwidth into acoupler 110. Thecoupler 110 passes the light onto theoptical waveguide 104. Reflections at the Bragg wavelengths of the variousfiber Brag gratings 106 occur. Thecoupler 110 passes those reflections into areceiver 112. The fiber Bragggratings 106 are disposed such that the Bragg wavelengths depend on a physical parameter of interest. The output of thereceiver 112 is passed to ananalyzer 114 that determines from the Bragg wavelengths a measurement of the physical parameter of interest sensed by thesensors 102. Alternatively, if each sensor in a string has a different wavelength, then a broadband light source without a tunable filter can be used as a signal can still be received from each sensor at thereceiver 112. -
FIG. 2 illustrates anexemplary sensor 102 that is suitable for measuring parameters such as pressure and strain. Theoptical waveguide 104 includes anarrow core 202 that passes through a relativelythick cladding layer 204. That cladding layer is thinned around the fiber Bragg grating 106 to form a narrow section that includes the fiber Bragggrating 106. Around the narrow section is ashell 206 that is integrally mated with thecladding layer 204. To adjust the characteristics of theresulting sensor 102, when theshell 206 is mated with thecladding layer 204 theoptical waveguide 104 could be under tension, under a slight compression (a large compression would tend to buckle the narrow section), or, more typically, unbiased. The result is a fiber Bragg grating having a particular Bragg wavelength. When external pressure or strain is applied to theshell 206, longitudinal tension or compression occurs and the Bragg wavelength changes. A second fiber Bragg grating 212 outside of the narrow section can be included to provide a reference inside of theshell 206 for temperature compensation. -
FIG. 3 illustrates a tunable laser method of usingoptical sensors 102 to provide dynamic (AC) measurements. In that method, atunable laser 302 produces a narrow linewidth laser pulse 304 that is coupled by acoupler 110 into anoptical waveguide 104 having at least oneoptical sensor 102. The wavelength of the narrow linewidth laser pulse 304 is swept through a wavelength band that includes the Bragg wavelength of the fiber Bragggrating 106 in theoptical sensor 102. Theshape function 306 of the fiber Bragg grating 106, that is, its amplitude (Y-axis) verses wavelength (X-axis) characteristics, is determined by ahigh frequency receiver 112 and ananalyzer 114. Referring now toFIG. 4 , a particular power level, say the 3 dB point down from thepeak 402, is selected by the analyzer. Then, the analyzer sets the wavelength of thetunable laser 302 to thewavelength 404 that corresponds to the selected power level. Thus, the wavelength of thetunable laser 302 is set at a specific wavelength that is on theshape function 306. Then the intensity of the reflected light is monitored. Variations in the intensity correspond to dynamic pressure changes impressed on theoptical sensor 102. Thehigh frequency receiver 112 and theanalyzer 114 can provide wavelength and amplitude information from the variations in intensity. - The foregoing method illustrated with the assistance of
FIGS. 3 and 4 can also provide static pressure measurements. Since the position of theshape function 306 with respect to wavelength (shown in X-axis) depends on static pressure, theanalyzer 114 can determine static pressure based on thewavelength position 409 of thepeak 410 fiber Bragg grating reflection. It should be understood that whileFIGS. 3 and 4 only illustrate oneoptical sensor 102 theoptical waveguide 104 could have numerousoptical sensors 102. PATENT - In addition to providing dynamic pressure measurements, the principles of the present invention also provide for determining dynamic (AC) strain. One technique of doing this is illustrated in
FIG. 5 . As shown, alight source 500 launches light intoport 1 of a 4port circulator 502. That light is emitted fromport 2 of thecirculator 502 into anoptical waveguide 104. That waveguide includes asensor 503 that is comprised of two fiber Bragg gratings, 504 and 506. Thegratings gratings - Still referring to
FIG. 5 , the reflected light λ1 and λ2 on theoptical waveguide 104 enters thecirculator 502. Wavelength λ2 passes through awavelength filter 510, but wavelength λ1 is reflected. The passed wavelength λ2 is received and amplified by afirst receiver 514. The output ofreceiver 514 is passed to ananalyzer 516. Meanwhile, λ1 is output fromport 4 of thecirculator 502. The wavelength λ1 is received and amplified by asecond receiver 518. The output of thesecond receiver 518 is applied to theanalyzer 516. Theanalyzer 516 compares the ratio of the reflected wavelengths and determines the dynamic (AC) strain applied to the long period grating 508. - While the foregoing is directed to embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Claims (6)
1. An optical sensor comprising:
an optical waveguide with a first fiber Bragg grating having a first Bragg wavelength, a second fiber Bragg grating having a second Bragg wavelength, and a long period grating disposed between said first fiber Bragg grating and said second fiber Bragg grating;
a light source for emitting light at said first Bragg wavelength and at said second Bragg wavelength;
a first receiver for converting reflected light at said first Bragg wavelength into first electrical signals;
a second receiver for converting reflected light at said second Bragg wavelength into second electrical signals;
a coupler for coupling said light into said optical waveguide, for coupling reflected light at said first Bragg wavelength to said first receiver, and for coupling reflected light at said second Bragg wavelength to said second receiver; and
an analyzer for receiving said first and said second electrical signals and for using said first and said second electrical signals to determine a physical parameter applied to said long period grating.
2. The optical sensor of claim 1 wherein said physical parameter changes an amplitude of reflected light at said second Bragg wavelength.
3. The optical sensor of claim 2 wherein said physical parameter is stress.
4. The optical sensor of claim 2 wherein said physical parameter is strain.
5. The optical sensor of claim 2 wherein said physical parameter is pressure.
6. The optical sensor of claim 1 , further including a filter disposed between said coupler and said first receiver.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US11/945,418 US20080085073A1 (en) | 2005-03-10 | 2007-11-27 | Dynamic optical waveguide sensor |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US11/076,706 US7302123B2 (en) | 2005-03-10 | 2005-03-10 | Dynamic optical waveguide sensor |
US11/945,418 US20080085073A1 (en) | 2005-03-10 | 2007-11-27 | Dynamic optical waveguide sensor |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US11/076,706 Division US7302123B2 (en) | 2005-03-10 | 2005-03-10 | Dynamic optical waveguide sensor |
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US20080085073A1 true US20080085073A1 (en) | 2008-04-10 |
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US11/945,418 Abandoned US20080085073A1 (en) | 2005-03-10 | 2007-11-27 | Dynamic optical waveguide sensor |
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US11/076,706 Expired - Fee Related US7302123B2 (en) | 2005-03-10 | 2005-03-10 | Dynamic optical waveguide sensor |
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US (2) | US7302123B2 (en) |
CA (1) | CA2539052C (en) |
GB (1) | GB2424067B (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2166328A1 (en) | 2008-09-22 | 2010-03-24 | Universita' degli studi di Bari | System for optical fiber strain measure |
ES2342809A1 (en) * | 2008-08-26 | 2010-07-14 | Kronsa Internacional, S.A. | System of monitoring of tensions in anchorages of work. (Machine-translation by Google Translate, not legally binding) |
US20130145852A1 (en) * | 2011-12-12 | 2013-06-13 | General Electric Company | High Pressure Fiber Optic Sensor System |
US20160305771A1 (en) * | 2015-04-14 | 2016-10-20 | Washington State University | Low-cost fiber optic sensor for large strains |
WO2022223552A1 (en) * | 2021-04-21 | 2022-10-27 | Centre National De La Recherche Scientifique | Pressure-measuring device |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
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ES2267366B1 (en) * | 2004-12-29 | 2008-02-16 | Sistemas Materiales Sensados,S.L. | SENSING SYSTEM FOR THE MEASUREMENT OF DEFORMATIONS IN STRUCTURES OR MACHINES. |
US7302123B2 (en) * | 2005-03-10 | 2007-11-27 | Weatherford/Lamb, Inc. | Dynamic optical waveguide sensor |
EP2331923B1 (en) * | 2008-09-23 | 2013-06-19 | Voith Patent GmbH | Industrial roll with optical roll cover sensor system |
US8280202B2 (en) * | 2009-05-14 | 2012-10-02 | General Electric Company | Fiber-optic dynamic sensing modules and methods |
WO2011028628A2 (en) * | 2009-08-26 | 2011-03-10 | Tomophase Corporation | Optical tissue imaging based on optical frequency domain imaging |
US9267821B2 (en) * | 2010-01-28 | 2016-02-23 | Baker Hughes Incorporated | Combined swept-carrier and swept-modulation frequency optical frequency domain reflectometry |
JP5587509B2 (en) * | 2010-10-08 | 2014-09-10 | ハルビン エンジニアリング ユニバーシティ | Multi-path autocorrelator for sensors based on optical fiber ring |
GB2485808A (en) * | 2010-11-24 | 2012-05-30 | Vestas Wind Sys As | Long fibre Bragg grating sensor in a wind turbine |
EP2696182A1 (en) * | 2012-08-10 | 2014-02-12 | Nederlandse Organisatie voor toegepast -natuurwetenschappelijk onderzoek TNO | Optical sensor and method for measuring the pressure of a fluid |
US9677963B2 (en) | 2014-07-14 | 2017-06-13 | Weatherford Technology Holdings, Llc | Small profile pressure and temperature gauges |
DE102015214749B4 (en) * | 2015-08-03 | 2017-04-27 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Device and method for detecting a load and mechanical component |
CN105651197A (en) * | 2015-09-17 | 2016-06-08 | 梁威 | Sensor of using optical fiber radiation loss to detect physically-based deformation |
CN105806374B (en) * | 2016-05-06 | 2019-02-26 | 深圳市畅格光电有限公司 | A kind of demodulation method of optic fiber grating wavelength |
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US6016702A (en) * | 1997-09-08 | 2000-01-25 | Cidra Corporation | High sensitivity fiber optic pressure sensor for use in harsh environments |
US6422084B1 (en) * | 1998-12-04 | 2002-07-23 | Weatherford/Lamb, Inc. | Bragg grating pressure sensor |
US20030141440A1 (en) * | 2002-01-28 | 2003-07-31 | Ices Co., Ltd. | Multi-type fiber bragg grating sensor system |
US6819812B2 (en) * | 2001-10-26 | 2004-11-16 | Lake Shore Cryotronics, Inc. | System and method for measuring physical, chemical and biological stimuli using vertical cavity surface emitting lasers with integrated tuner |
US7129470B2 (en) * | 2003-06-04 | 2006-10-31 | Weatherford/Lamb, Inc. | Optical sensor using a long period grating suitable for dynamic interrogation |
US7302123B2 (en) * | 2005-03-10 | 2007-11-27 | Weatherford/Lamb, Inc. | Dynamic optical waveguide sensor |
-
2005
- 2005-03-10 US US11/076,706 patent/US7302123B2/en not_active Expired - Fee Related
-
2006
- 2006-03-09 CA CA2539052A patent/CA2539052C/en not_active Expired - Fee Related
- 2006-03-10 GB GB0604917A patent/GB2424067B/en not_active Expired - Fee Related
-
2007
- 2007-11-27 US US11/945,418 patent/US20080085073A1/en not_active Abandoned
Patent Citations (6)
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US6016702A (en) * | 1997-09-08 | 2000-01-25 | Cidra Corporation | High sensitivity fiber optic pressure sensor for use in harsh environments |
US6422084B1 (en) * | 1998-12-04 | 2002-07-23 | Weatherford/Lamb, Inc. | Bragg grating pressure sensor |
US6819812B2 (en) * | 2001-10-26 | 2004-11-16 | Lake Shore Cryotronics, Inc. | System and method for measuring physical, chemical and biological stimuli using vertical cavity surface emitting lasers with integrated tuner |
US20030141440A1 (en) * | 2002-01-28 | 2003-07-31 | Ices Co., Ltd. | Multi-type fiber bragg grating sensor system |
US7129470B2 (en) * | 2003-06-04 | 2006-10-31 | Weatherford/Lamb, Inc. | Optical sensor using a long period grating suitable for dynamic interrogation |
US7302123B2 (en) * | 2005-03-10 | 2007-11-27 | Weatherford/Lamb, Inc. | Dynamic optical waveguide sensor |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2342809A1 (en) * | 2008-08-26 | 2010-07-14 | Kronsa Internacional, S.A. | System of monitoring of tensions in anchorages of work. (Machine-translation by Google Translate, not legally binding) |
EP2166328A1 (en) | 2008-09-22 | 2010-03-24 | Universita' degli studi di Bari | System for optical fiber strain measure |
US20100076700A1 (en) * | 2008-09-22 | 2010-03-25 | Universita Degli Studi Di Bari | System for optical fiber strain measure |
US8234081B2 (en) | 2008-09-22 | 2012-07-31 | Universita Degli Studi Di Bari | System for optical fiber strain measure |
US20130145852A1 (en) * | 2011-12-12 | 2013-06-13 | General Electric Company | High Pressure Fiber Optic Sensor System |
US8590385B2 (en) * | 2011-12-12 | 2013-11-26 | General Electric Company | High pressure fiber optic sensor system |
US20160305771A1 (en) * | 2015-04-14 | 2016-10-20 | Washington State University | Low-cost fiber optic sensor for large strains |
US9846276B2 (en) * | 2015-04-14 | 2017-12-19 | Washington State University | Low-cost fiber optic sensor for large strains |
WO2022223552A1 (en) * | 2021-04-21 | 2022-10-27 | Centre National De La Recherche Scientifique | Pressure-measuring device |
FR3122255A1 (en) * | 2021-04-21 | 2022-10-28 | Centre National De La Recherche Scientifique | Device for pressure measurement |
Also Published As
Publication number | Publication date |
---|---|
GB2424067A (en) | 2006-09-13 |
GB0604917D0 (en) | 2006-04-19 |
GB2424067B (en) | 2008-04-16 |
US7302123B2 (en) | 2007-11-27 |
CA2539052A1 (en) | 2006-09-10 |
CA2539052C (en) | 2011-05-03 |
US20060204174A1 (en) | 2006-09-14 |
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