GB2397882A - Strain sensor - Google Patents

Strain sensor Download PDF

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Publication number
GB2397882A
GB2397882A GB0411196A GB0411196A GB2397882A GB 2397882 A GB2397882 A GB 2397882A GB 0411196 A GB0411196 A GB 0411196A GB 0411196 A GB0411196 A GB 0411196A GB 2397882 A GB2397882 A GB 2397882A
Authority
GB
United Kingdom
Prior art keywords
sensing element
strain
strain sensing
optic fibre
force
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
GB0411196A
Other versions
GB0411196D0 (en
GB2397882B (en
Inventor
Scott Mcculloch
Gary Burnell
Robert Raimund Josef Maier
James Stephen Barton
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
Application filed by UK Secretary of State for Defence filed Critical UK Secretary of State for Defence
Publication of GB0411196D0 publication Critical patent/GB0411196D0/en
Publication of GB2397882A publication Critical patent/GB2397882A/en
Application granted granted Critical
Publication of GB2397882B publication Critical patent/GB2397882B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
    • G01L9/0033—Transmitting or indicating the displacement of bellows by electric, electromechanical, magnetic, or electromagnetic means
    • G01L9/0039—Transmitting or indicating the displacement of bellows by electric, electromechanical, magnetic, or electromagnetic means using photoelectric means
    • 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
    • G01L1/243—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 means for applying force perpendicular to the fibre axis
    • 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

Abstract

A strain sensor comprising a strain sensing element whose response to interrogation is dependent on the force to which it is subjected, the strain sensing element having a long axis, wherein, in use, the application of a given force to the strain sensing element in a direction substantially aparallel to the long axis induces a greater strain in the strain sensing element than the given force would induce when applied in a direction substantially parallel to the long axis wherein the strain sensing element is a wavelength selective element, the wavelength selective element being disposed within an optic fibre, the long axis of the strain sensing element being defined as being the longitudinal axis of the optic fibre in the locality of the strain sensing element wherein the optic fibre is tethered to a substrate at a first and second point such that the optic fibre therebetween is substantially strain-relieved from the application of force to the optic fibre external of the first and second points, the wavelength selective element being disposed therebetween, wherein, in use, a force is applied between the first and second attachment points.

Description

GB 2397882 A continuation (72) cont Robert Raimund Josef Maier James
Stephen Barton Julian David Clayton Jones (74) Agent and/or Address for Service: D/IPR Formalities Section Poplar 2, MOD Abbey Wood #2218, Bristol, BS34 8JH, United Kingdom
GB0411196A 2001-11-15 2002-11-13 Strain sensor Expired - Fee Related GB2397882B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0127497A GB0127497D0 (en) 2001-11-15 2001-11-15 Strain sensor
PCT/GB2002/005140 WO2003042647A1 (en) 2001-11-15 2002-11-13 Strain sensor

Publications (3)

Publication Number Publication Date
GB0411196D0 GB0411196D0 (en) 2004-06-23
GB2397882A true GB2397882A (en) 2004-08-04
GB2397882B GB2397882B (en) 2005-11-09

Family

ID=9925881

Family Applications (2)

Application Number Title Priority Date Filing Date
GB0127497A Ceased GB0127497D0 (en) 2001-11-15 2001-11-15 Strain sensor
GB0411196A Expired - Fee Related GB2397882B (en) 2001-11-15 2002-11-13 Strain sensor

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB0127497A Ceased GB0127497D0 (en) 2001-11-15 2001-11-15 Strain sensor

Country Status (2)

Country Link
GB (2) GB0127497D0 (en)
WO (1) WO2003042647A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3441792C1 (en) * 1984-11-15 1985-11-28 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., 8000 München Fibre-optic force sensor, in particular pressure sensor
US5490427A (en) * 1994-10-17 1996-02-13 Fanuc Usa Corporation Six axis force sensor employing multiple shear strain gages
WO1999032862A1 (en) * 1997-12-05 1999-07-01 Optoplan As Device for measuring a bending load
WO2001020377A1 (en) * 1999-09-10 2001-03-22 Siemens Aktiengesellschaft Method for producing an optical grating on an optical conductor and device comprising a grating of this type

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3441792C1 (en) * 1984-11-15 1985-11-28 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., 8000 München Fibre-optic force sensor, in particular pressure sensor
US5490427A (en) * 1994-10-17 1996-02-13 Fanuc Usa Corporation Six axis force sensor employing multiple shear strain gages
WO1999032862A1 (en) * 1997-12-05 1999-07-01 Optoplan As Device for measuring a bending load
WO2001020377A1 (en) * 1999-09-10 2001-03-22 Siemens Aktiengesellschaft Method for producing an optical grating on an optical conductor and device comprising a grating of this type

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
Liu Y et al,"IEE photonics technology letters", published 2000, IEEE pp 531-533, vol 12 "Optical bend sensor based on measurement of resonance mode splitting of long-period fiber grating" *
Miyazaki et al, "IEEE power engineering society 1999 winter meeting", published 1999, IEEE, pp 221-226, vol 1, "Gas pressure monitoring system for gil using fiber-optic gas density sensors" *

Also Published As

Publication number Publication date
GB0127497D0 (en) 2002-01-09
GB0411196D0 (en) 2004-06-23
WO2003042647A1 (en) 2003-05-22
GB2397882B (en) 2005-11-09

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20061113