WO2005040727A3 - Improvements in and relating to fibre optic sensors - Google Patents

Improvements in and relating to fibre optic sensors Download PDF

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Publication number
WO2005040727A3
WO2005040727A3 PCT/GB2004/004333 GB2004004333W WO2005040727A3 WO 2005040727 A3 WO2005040727 A3 WO 2005040727A3 GB 2004004333 W GB2004004333 W GB 2004004333W WO 2005040727 A3 WO2005040727 A3 WO 2005040727A3
Authority
WO
WIPO (PCT)
Prior art keywords
coupler
light
interaction
signals
sensor
Prior art date
Application number
PCT/GB2004/004333
Other languages
French (fr)
Other versions
WO2005040727A2 (en
Inventor
Rongshen Chen
Thomas Butler
Gerard Franklyn Fernando
Rodney Alan Badcock
Original Assignee
Univ Cranfield
Rongshen Chen
Thomas Butler
Gerard Franklyn Fernando
Rodney Alan Badcock
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
Application filed by Univ Cranfield, Rongshen Chen, Thomas Butler, Gerard Franklyn Fernando, Rodney Alan Badcock filed Critical Univ Cranfield
Publication of WO2005040727A2 publication Critical patent/WO2005040727A2/en
Publication of WO2005040727A3 publication Critical patent/WO2005040727A3/en

Links

Classifications

    • 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
    • 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
    • G02B6/255—Splicing of light guides, e.g. by fusion or bonding
    • G02B6/2552—Splicing of light guides, e.g. by fusion or bonding reshaping or reforming of light guides for coupling using thermal heating, e.g. tapering, forming of a lens on light guide ends
    • 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
    • G02B6/264—Optical coupling means with optical elements between opposed fibre ends which perform a function other than beam splitting
    • 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
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4295—Coupling light guides with opto-electronic elements coupling with semiconductor devices activated by light through the light guide, e.g. thyristors, phototransistors
    • 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
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4296—Coupling light guides with opto-electronic elements coupling with sources of high radiant energy, e.g. high power lasers, high temperature light sources
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R23/00—Transducers other than those covered by groups H04R9/00 - H04R21/00
    • H04R23/008—Transducers other than those covered by groups H04R9/00 - H04R21/00 using optical signals for detecting or generating sound
    • 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
    • G02B6/2804—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers
    • G02B6/2856—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers formed or shaped by thermal heating means, e.g. splitting, branching and/or combining elements

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Plasma & Fusion (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Optical Transform (AREA)

Abstract

An AE sensor comprising a fused-tapered optical fibre coupler (11) for receiving light from a light source (12) at the insertion end of the coupler and, via an interaction/coupling region, splitting the light to produce light signals at each exit end of the coupler, detector means (D1, 132) for detecting said light signals and comparator means (10) for comparing said signals to thereby indicate the occurrence of an acoustic emission event during a steady state condition characterise in that the coupler has a sharp taper angle and a short interaction/coupling region to maximise the stress concentration following an AE event in the interaction region, thereby increasing the sensitivity of the coupler, and hence the sensor, to stress.
PCT/GB2004/004333 2003-10-13 2004-10-12 Improvements in and relating to fibre optic sensors WO2005040727A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0323946.4 2003-10-13
GB0323946A GB2407154B8 (en) 2003-10-13 2003-10-13 Improvements in and relating to fibre optic sensors

Publications (2)

Publication Number Publication Date
WO2005040727A2 WO2005040727A2 (en) 2005-05-06
WO2005040727A3 true WO2005040727A3 (en) 2005-09-15

Family

ID=29433803

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2004/004333 WO2005040727A2 (en) 2003-10-13 2004-10-12 Improvements in and relating to fibre optic sensors

Country Status (2)

Country Link
GB (1) GB2407154B8 (en)
WO (1) WO2005040727A2 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008514902A (en) 2004-09-28 2008-05-08 ザ コモンウェルス オブ オーストラリア Light sound pressure sensor
US7810395B2 (en) 2005-12-22 2010-10-12 Total Wire Corporation Ultrasonic pressure sensor and method of operating the same
US8166825B2 (en) 2007-10-30 2012-05-01 Tea Time Partners, L.P. Method and apparatus for noise reduction in ultrasound detection
CN101726354B (en) * 2009-12-16 2011-07-20 中国科学院半导体研究所 Optical fiber laser vector hydrophone
CN103472136A (en) * 2013-08-30 2013-12-25 南京航空航天大学 Acoustic emission sensing system based on single mode fiber coupler
CN108195943B (en) * 2018-03-12 2023-11-03 中国工程物理研究院化工材料研究所 Optical fiber acoustic emission system for monitoring explosive damage and destruction process and monitoring method thereof
CN110132329B (en) * 2019-05-08 2021-05-04 汕头大学 Stress, temperature and vibration composite detection optical fiber sensor and signal processing method

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4471474A (en) * 1979-09-28 1984-09-11 Hughes Aircraft Company Coupled waveguide acousto-optic hydrophone
US6134362A (en) * 1998-06-04 2000-10-17 U.S.A. Kaifa Technology, Inc. Short length fused fiber optical couplers and method of making same
WO2001014918A1 (en) * 1999-08-20 2001-03-01 The University Of Bath Improvements in and relating to fibre optic devices
WO2001065217A1 (en) * 2000-02-29 2001-09-07 Cranfield University Acoustic emission detection using a fibre-optic mode-coupling element

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4634858A (en) * 1984-10-17 1987-01-06 Sperry Corporation Variable coupler fiberoptic sensor
US5074309A (en) * 1989-12-04 1991-12-24 Sperry Marine Inc. Device for monitoring cardiovascular signals and fiber optic coupler phonocardio sensor therefor
EP1107691A4 (en) * 1998-08-24 2005-04-06 Martin C Baruch Apparatus and method for measuring pulse transit time
US6723054B1 (en) * 1998-08-24 2004-04-20 Empirical Technologies Corporation Apparatus and method for measuring pulse transit time
GB9820467D0 (en) * 1998-09-18 1998-11-11 Europ Economic Community Sensing apparatus and a measurment method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4471474A (en) * 1979-09-28 1984-09-11 Hughes Aircraft Company Coupled waveguide acousto-optic hydrophone
US6134362A (en) * 1998-06-04 2000-10-17 U.S.A. Kaifa Technology, Inc. Short length fused fiber optical couplers and method of making same
WO2001014918A1 (en) * 1999-08-20 2001-03-01 The University Of Bath Improvements in and relating to fibre optic devices
WO2001065217A1 (en) * 2000-02-29 2001-09-07 Cranfield University Acoustic emission detection using a fibre-optic mode-coupling element

Also Published As

Publication number Publication date
GB2407154A8 (en) 2007-02-20
GB2407154A (en) 2005-04-20
GB0323946D0 (en) 2003-11-12
GB2407154B (en) 2007-01-10
WO2005040727A2 (en) 2005-05-06
GB2407154B8 (en) 2007-02-20

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