WO2007149930A3 - Fiber optic sensing instrument and system with fiber of adjustable optical path length and method of using it - Google Patents

Fiber optic sensing instrument and system with fiber of adjustable optical path length and method of using it Download PDF

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Publication number
WO2007149930A3
WO2007149930A3 PCT/US2007/071686 US2007071686W WO2007149930A3 WO 2007149930 A3 WO2007149930 A3 WO 2007149930A3 US 2007071686 W US2007071686 W US 2007071686W WO 2007149930 A3 WO2007149930 A3 WO 2007149930A3
Authority
WO
Grant status
Application
Patent type
Prior art keywords
optical
fiber
optical path
path length
optical fiber
Prior art date
Application number
PCT/US2007/071686
Other languages
French (fr)
Other versions
WO2007149930A2 (en )
Inventor
W Don Morison
Gerald Manuelpillai
Roderick C Tennyson
Thierry Cherpillod
Dominic Rouse
Original Assignee
Fiber Optic Systems Technology
W Don Morison
Gerald Manuelpillai
Roderick C Tennyson
Thierry Cherpillod
Dominic Rouse
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

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Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B9/00Instruments as specified in the subgroups and characterised by the use of optical measuring means
    • G01B9/02Interferometers for determining dimensional properties of, or relations between, measurement objects
    • G01B9/0209Non-tomographic low coherence interferometers, e.g. low coherence interferometry, scanning white light interferometry, optical frequency domain interferometry or reflectometry
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00Measuring arrangements characterised by the use of optical means
    • G01B11/16Measuring arrangements characterised by the use of optical means for measuring the deformation in a solid, e.g. optical strain gauge
    • G01B11/18Measuring arrangements characterised by the use of optical means for measuring the deformation in a solid, e.g. optical strain gauge using photoelastic elements
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B9/00Instruments as specified in the subgroups and characterised by the use of optical measuring means
    • G01B9/02Interferometers for determining dimensional properties of, or relations between, measurement objects
    • G01B9/02015Interferometers for determining dimensional properties of, or relations between, measurement objects characterised by a particular beam path configuration
    • G01B9/02027Two or more interferometric channels or interferometers
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01DMEASURING 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
    • G01D5/00Mechanical 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
    • G01D5/26Mechanical 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 infra-red, visible, or ultra-violet light
    • G01D5/32Mechanical 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 infra-red, visible, or ultra-violet light with attenuation or whole or partial obturation of beams of light
    • G01D5/34Mechanical 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 infra-red, visible, or ultra-violet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
    • G01D5/353Mechanical 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 infra-red, visible, or ultra-violet 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
    • G01D5/35303Mechanical 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 infra-red, visible, or ultra-violet 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
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING STRUCTURES OR APPARATUS NOT OTHERWISE PROVIDED FOR
    • G01M11/00Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
    • G01M11/08Testing of mechanical properties
    • G01M11/083Testing of mechanical properties by using an optical fiber in contact with the device under test [DUT]
    • G01M11/085Testing of mechanical properties by using an optical fiber in contact with the device under test [DUT] the optical fiber being on or near the surface of the DUT

Abstract

An interoferometnc fiber optic sensing system uses three optical fibers A sensing optical fiber (13) is applied to a structure to be monitored to detect displacement or the like by changing its optical path length A reference optical fiber (3) has a fixed optical path length An adjustable optical path length is made in the third optical fiber (118) The three optical fibers form optical paths whose lig outputs are caused to interfere The adjustable length optical fiber is adjusted until an interference fringe appears The quantity to be detected is derived from the maximum of the interference fringe Several sensing optical fibers can be multiplexed, by staggering thei optical path lengths, their interference fringes can be separated sufficiently to resolve them
PCT/US2007/071686 2006-06-20 2007-06-20 Fiber optic sensing instrument and system with fiber of adjustable optical path length and method of using it WO2007149930A3 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
UAa200606916 2006-06-20
UA200606916 2006-06-20

Publications (2)

Publication Number Publication Date
WO2007149930A2 true WO2007149930A2 (en) 2007-12-27
WO2007149930A3 true true WO2007149930A3 (en) 2008-09-18

Family

ID=38834357

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2007/071686 WO2007149930A3 (en) 2006-06-20 2007-06-20 Fiber optic sensing instrument and system with fiber of adjustable optical path length and method of using it

Country Status (1)

Country Link
WO (1) WO2007149930A3 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2696238C (en) * 2008-02-29 2013-04-16 Fujikura Ltd. Physical quantity measuring apparatus utilizing optical frequency domain reflectometry, and method for simultaneous measurement of temperature and strain using the apparatus

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040184724A1 (en) * 2003-03-06 2004-09-23 Fujitsu Limited Chromatic dispersion compensation device and method
US20040202400A1 (en) * 2003-04-14 2004-10-14 Lake Shore Cryotronics, Inc. System and method for measuring physical stimuli using vertical cavity surface emitting lasers with integrated tuning means

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040184724A1 (en) * 2003-03-06 2004-09-23 Fujitsu Limited Chromatic dispersion compensation device and method
US20040202400A1 (en) * 2003-04-14 2004-10-14 Lake Shore Cryotronics, Inc. System and method for measuring physical stimuli using vertical cavity surface emitting lasers with integrated tuning means

Also Published As

Publication number Publication date Type
WO2007149930A2 (en) 2007-12-27 application

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