GB2325741A - Sensor system - Google Patents

Sensor system

Info

Publication number
GB2325741A
GB2325741A GB9819954A GB9819954A GB2325741A GB 2325741 A GB2325741 A GB 2325741A GB 9819954 A GB9819954 A GB 9819954A GB 9819954 A GB9819954 A GB 9819954A GB 2325741 A GB2325741 A GB 2325741A
Authority
GB
United Kingdom
Prior art keywords
light
optical
strain
arm
sensor
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
Application number
GB9819954A
Other versions
GB9819954D0 (en
GB2325741B (en
Inventor
David George Luke
Roy Mcbride
Peter Arthur Lloyd
James Gordon Burnett
Alan Howard Greenaway
Julian David Clayton Jones
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
UK Secretary of State for Defence
Original Assignee
UK Secretary of State for Defence
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
Priority claimed from GB9606785A external-priority patent/GB2311600A/en
Application filed by UK Secretary of State for Defence filed Critical UK Secretary of State for Defence
Priority to GB9819954A priority Critical patent/GB2325741B/en
Publication of GB9819954D0 publication Critical patent/GB9819954D0/en
Publication of GB2325741A publication Critical patent/GB2325741A/en
Application granted granted Critical
Publication of GB2325741B publication Critical patent/GB2325741B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
    • G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
    • 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
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Instruments For Measurement Of Length By Optical Means (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

A sensor system (10) incorporating an interferometer operates as an optical strain gauge. The system (10) is arranged to generate interferograms characterised by an optical path difference between light traversing a sensor arm (12) of the interferometer and light traversing a reference arm (58). Each arm incorporates a highly birefringent optical fibre (38, 58) capable of supporting light propagation at two velocities in two different polarisation modes. A first interferogram is generated between light coupled into the fast eigenmodes of each fibre and a second is generated between light coupled into the slow eigenmodes. Mean optical group delay (# MGD ) and differential optical group delay (# DGD ) of these interferograms are affected differently by temperature and strain and thus provide a means of discriminating between these attributes of the sensor environment. Thus simultaneous measurement of strain and temperature is achieved.
GB9819954A 1996-03-29 1997-03-24 Sensor system Expired - Fee Related GB2325741B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9819954A GB2325741B (en) 1996-03-29 1997-03-24 Sensor system

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB9606785A GB2311600A (en) 1996-03-29 1996-03-29 Optic Fibre Interferometric sensor
GB9819954A GB2325741B (en) 1996-03-29 1997-03-24 Sensor system
PCT/GB1997/000807 WO1997037197A1 (en) 1996-03-29 1997-03-24 Sensor system

Publications (3)

Publication Number Publication Date
GB9819954D0 GB9819954D0 (en) 1998-11-04
GB2325741A true GB2325741A (en) 1998-12-02
GB2325741B GB2325741B (en) 2000-03-01

Family

ID=26309032

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9819954A Expired - Fee Related GB2325741B (en) 1996-03-29 1997-03-24 Sensor system

Country Status (1)

Country Link
GB (1) GB2325741B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2374928A (en) * 2000-12-12 2002-10-30 Optoplan As Fibre optic sensor systems

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995002802A1 (en) * 1993-07-12 1995-01-26 The Secretary Of State For Defence Sensor system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995002802A1 (en) * 1993-07-12 1995-01-26 The Secretary Of State For Defence Sensor system

Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
Optics Letters, Vol 19, No 24, December 1994, pages 2164-66 *
Optics Letters, Vol 19, No 24, December 1994, pages 2167-69 *
Optics Letters, Vol 20, No 3, February 1995, page 333-35 *
Proceedings of SPIE, Vol 1367, 17-19 September 1990, pages 249-260 *
Proceedings of SPIE, Vol 2861, 8-9 August 1996, pages 26-31 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2374928A (en) * 2000-12-12 2002-10-30 Optoplan As Fibre optic sensor systems
GB2374928B (en) * 2000-12-12 2005-07-13 Optoplan As Fibre optic sensor systems

Also Published As

Publication number Publication date
GB9819954D0 (en) 1998-11-04
GB2325741B (en) 2000-03-01

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Legal Events

Date Code Title Description
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20030324