CA2009033A1 - Optical sensor displacement monitor - Google Patents
Optical sensor displacement monitorInfo
- Publication number
- CA2009033A1 CA2009033A1 CA2009033A CA2009033A CA2009033A1 CA 2009033 A1 CA2009033 A1 CA 2009033A1 CA 2009033 A CA2009033 A CA 2009033A CA 2009033 A CA2009033 A CA 2009033A CA 2009033 A1 CA2009033 A1 CA 2009033A1
- Authority
- CA
- Canada
- Prior art keywords
- fiber
- optical sensor
- sensor displacement
- displacement monitor
- optical
- 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
Links
- 230000003287 optical effect Effects 0.000 title abstract 5
- 238000006073 displacement reaction Methods 0.000 title 1
- 239000000835 fiber Substances 0.000 abstract 6
- 238000005253 cladding Methods 0.000 abstract 2
- 230000008602 contraction Effects 0.000 abstract 1
- 239000013307 optical fiber Substances 0.000 abstract 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/08—Testing mechanical properties
- G01M11/083—Testing mechanical properties by using an optical fiber in contact with the device under test [DUT]
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/103—Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
- A61B5/107—Measuring physical dimensions, e.g. size of the entire body or parts thereof
- A61B5/1073—Measuring volume, e.g. of limbs
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/103—Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
- A61B5/11—Measuring movement of the entire body or parts thereof, e.g. head or hand tremor, mobility of a limb
- A61B5/1126—Measuring movement of the entire body or parts thereof, e.g. head or hand tremor, mobility of a limb using a particular sensing technique
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/103—Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
- A61B5/11—Measuring movement of the entire body or parts thereof, e.g. head or hand tremor, mobility of a limb
- A61B5/113—Measuring movement of the entire body or parts thereof, e.g. head or hand tremor, mobility of a limb occurring during breathing
- A61B5/1135—Measuring movement of the entire body or parts thereof, e.g. head or hand tremor, mobility of a limb occurring during breathing by monitoring thoracic expansion
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
- G01B11/18—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge using photoelastic elements
-
- 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
- G01D5/3537—Optical fibre sensor using a particular arrangement of the optical fibre itself
- G01D5/35374—Particular layout of the fiber
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
- G01H9/004—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors
-
- 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
- G01L1/243—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
- G01L1/245—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 using microbending
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B2562/00—Details of sensors; Constructional details of sensor housings or probes; Accessories for sensors
- A61B2562/02—Details of sensors specially adapted for in-vivo measurements
- A61B2562/0261—Strain gauges
- A61B2562/0266—Optical strain gauges
Abstract
An optical sensor comprising an optical fiber having a core covered by a cladding, the cladding having an index of refraction different from that of the core, apparatus for retaining the fiber in a sinuously looped disposition, apparatus for fixing the fiber to an object to be sensed whereby movement to be sensed results in one or both of accordion expansion and contraction of loops of the fiber and microbending of the fiber, apparatus for applying a first optical signal into one end of the fiber, apparatus for detecting a resulting optical signal from the other end of the fiber, and apparatus for comparing the first and resulting optical signals to obtain an indication of the movement.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA002130429A CA2130429C (en) | 1990-01-31 | 1990-01-31 | Optical sensor displacement monitor |
CA002009033A CA2009033C (en) | 1990-01-31 | 1990-01-31 | Optical sensor displacement monitor |
US07/631,871 US5134281A (en) | 1990-01-31 | 1990-12-21 | Microbend optic sensor with fiber being sewn thereto in a sinuously looped disposition |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA002009033A CA2009033C (en) | 1990-01-31 | 1990-01-31 | Optical sensor displacement monitor |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002130429A Division CA2130429C (en) | 1990-01-31 | 1990-01-31 | Optical sensor displacement monitor |
Publications (2)
Publication Number | Publication Date |
---|---|
CA2009033A1 true CA2009033A1 (en) | 1991-07-31 |
CA2009033C CA2009033C (en) | 1994-11-01 |
Family
ID=4144173
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002130429A Expired - Fee Related CA2130429C (en) | 1990-01-31 | 1990-01-31 | Optical sensor displacement monitor |
CA002009033A Expired - Fee Related CA2009033C (en) | 1990-01-31 | 1990-01-31 | Optical sensor displacement monitor |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002130429A Expired - Fee Related CA2130429C (en) | 1990-01-31 | 1990-01-31 | Optical sensor displacement monitor |
Country Status (2)
Country | Link |
---|---|
US (1) | US5134281A (en) |
CA (2) | CA2130429C (en) |
Families Citing this family (61)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5291013A (en) * | 1991-12-06 | 1994-03-01 | Alamed Corporation | Fiber optical monitor for detecting normal breathing and heartbeat motion based on changes in speckle patterns |
US5241300B1 (en) * | 1992-04-24 | 1995-10-31 | Johannes Buschmann | Sids detection apparatus and methods |
NL9202256A (en) * | 1992-12-24 | 1994-07-18 | Peter Bernard Defares | Interactive breathing regulator. |
FR2715821B1 (en) * | 1994-02-07 | 1997-09-05 | Univ Alsace | Aid for functional rehabilitation, particularly of the spine. |
US5529235A (en) * | 1994-04-28 | 1996-06-25 | Ethicon Endo-Surgery, Inc. | Identification device for surgical instrument |
SE505708C2 (en) * | 1995-09-11 | 1997-09-29 | Icor Instr Ab | Device for transmitting non-parallel light from a light source to a receiver. |
US6030347A (en) * | 1996-01-12 | 2000-02-29 | Matsushita Electric Works, Ltd. | Biological-signal detecting device |
US5952647A (en) * | 1996-03-20 | 1999-09-14 | Seb S.A. | Force measuring apparatus with optical sensor enabling limitation of eccentricity defects in particular for bathroom scales and method of manufacturing apparatus of this kind |
US5818982A (en) * | 1996-04-01 | 1998-10-06 | Voss; Karl Friedrich | Fiber optic sensor based upon buckling of a freely suspended length of fiber |
ES2151378B1 (en) * | 1998-02-25 | 2001-06-16 | Daumal Castellon Melchor | A PERFECTED ANTI-PINCHING SYSTEM BASED ON THE MODIFICATION OF LIGHT CONDUCTIVITY OF AN OPTICAL FIBER FOR ELEVATING CRYSTALS INTENDED FOR THE CAR. |
DE19836496A1 (en) * | 1998-08-12 | 2000-02-17 | Karsten Hoeland | Measurement of optical attenuation of fiber optical waveguides as indication of heart or myocardial contractions |
EP0984254A1 (en) * | 1998-09-04 | 2000-03-08 | Talltec Technologies Holdings S.A. | Fiber-optical temperature sensor |
WO2001078601A1 (en) * | 2000-04-17 | 2001-10-25 | Resmed Limited | Detection and classification of breathing patterns |
AUPP974599A0 (en) | 1999-04-14 | 1999-05-06 | Resmed Limited | Detection and classification of breathing patterns |
US8229549B2 (en) * | 2004-07-09 | 2012-07-24 | Tyco Healthcare Group Lp | Surgical imaging device |
US7751870B2 (en) | 2002-01-30 | 2010-07-06 | Power Medical Interventions, Llc | Surgical imaging device |
FI115287B (en) | 1999-10-04 | 2005-04-15 | Polar Electro Oy | Electrode belt of a heart rate monitor |
US6607486B1 (en) * | 2000-01-10 | 2003-08-19 | Richard L. Watson | Beltless fiber optic labor contraction sensing device |
ES2307745T3 (en) * | 2001-04-20 | 2008-12-01 | Power Medical Interventions, Inc. | IMAGE FORMATION DEVICE. |
US6702847B2 (en) | 2001-06-29 | 2004-03-09 | Scimed Life Systems, Inc. | Endoluminal device with indicator member for remote detection of endoleaks and/or changes in device morphology |
EP1384437B1 (en) * | 2002-07-23 | 2006-12-27 | Aston University | Optical waveguide based surface profiling apparatus |
IL151284A0 (en) * | 2002-08-15 | 2003-04-10 | Mysens Ltd | System and method for fetal monitoring |
US6718078B2 (en) * | 2002-08-27 | 2004-04-06 | The United States Of America As Represented By The Secretary Of The Navy | High sensitivity fiber optic rotation sensor |
WO2004030526A1 (en) | 2002-09-30 | 2004-04-15 | Power Medical Interventions, Inc. | Self-contained sterilizable surgical system |
JP2008500839A (en) | 2002-11-18 | 2008-01-17 | ヴァージニア テック インテレクチュアル プロパティーズ インク | Perturbation detection system, apparatus and method |
US6904222B2 (en) * | 2003-06-28 | 2005-06-07 | General Dynamics Advanced Information Systems, Inc. | Optical fiber splice protection apparatus for use in optical fiber hydrophone array |
US6934451B2 (en) * | 2003-06-28 | 2005-08-23 | General Dynamics Advanced Information Systems, Inc. | Mount for use in optical fiber hydrophone array |
US6870997B2 (en) * | 2003-06-28 | 2005-03-22 | General Dynamics Advanced Information Systems, Inc. | Fiber splice tray for use in optical fiber hydrophone array |
US7027695B2 (en) * | 2003-06-28 | 2006-04-11 | General Dynamics Advanced Information Systems, Inc. | Fiber transition segment for use in optical fiber hydrophone array |
US6865334B2 (en) * | 2003-06-28 | 2005-03-08 | General Dynamics Advanced Information Systems, Inc. | Termination assembly for use in optical fiber hydrophone array |
US6879545B2 (en) * | 2003-06-28 | 2005-04-12 | General Dynamics Advanced Information Systems, Inc. | Woven fiber protection cable assembly for use in optical fiber hydrophone array |
US20060071770A1 (en) * | 2004-10-04 | 2006-04-06 | Frank Giotto | Fiber optic cable sensor for movable objects |
US7196317B1 (en) | 2005-03-25 | 2007-03-27 | Virginia Tech Intellectual Properties, Inc. | System, device, and method for detecting perturbations |
US7610093B2 (en) * | 2005-04-28 | 2009-10-27 | Medtronic, Inc. | Implantable optical pressure sensor for sensing urinary sphincter pressure |
US7623923B2 (en) * | 2005-04-28 | 2009-11-24 | Medtronic, Inc. | Tube sensor for penile tumescence |
US7328070B2 (en) * | 2005-04-28 | 2008-02-05 | Medtronic, Inc. | Multi-tube sensor for sensing urinary sphincter and urethral pressure |
US8068910B2 (en) * | 2005-04-28 | 2011-11-29 | Medtronic, Inc. | Flexible tube sensor for sensing urinary sphincter pressure |
CN100360905C (en) * | 2005-09-29 | 2008-01-09 | 上海交通大学 | Optical fiber micro-bending displacement sensor |
US20080154141A1 (en) * | 2006-12-26 | 2008-06-26 | Cardiac Pacemakers, Inc. | Intravascular Flow Sensor |
US10555691B2 (en) * | 2009-08-06 | 2020-02-11 | Agency For Science Technology And Research | Vital signs detecting device and a method for detecting vital signs |
CN101930014A (en) * | 2010-07-19 | 2010-12-29 | 西安金和光学科技有限公司 | Inertia parameter sensing device based on spring optical fiber microbending loss |
US9703029B2 (en) | 2011-09-28 | 2017-07-11 | Inteva Products, Llc | Method for providing illuminated components and components formed from the method |
WO2014009853A2 (en) * | 2012-07-09 | 2014-01-16 | Koninklijke Philips N.V. | Method and system for adaptive image guided intervention |
FR3003638A1 (en) * | 2013-03-22 | 2014-09-26 | Christophe Raymond | ANGULAR SENSOR BASED ON A MULTIMODE OPTICAL FIBER SNAP IN A NETWORK OF MACROSCOPIC CURVES. |
RU2622949C1 (en) | 2013-12-27 | 2017-06-21 | Халлибертон Энерджи Сервисез, Инк. | Installation brackets for strain gauge transducer |
WO2015112095A1 (en) * | 2014-01-23 | 2015-07-30 | Agency For Science, Technology And Research | Smart belt for breathing and heart rate monitoring |
CN106030033B (en) | 2014-02-24 | 2019-06-11 | 哈里伯顿能源服务公司 | The portable attachment and its method of fiber sensing loop |
CN106793878B (en) | 2014-09-30 | 2018-07-06 | 深圳市大耳马科技有限公司 | Posture and life sign monitor system and method |
WO2016086392A1 (en) * | 2014-12-04 | 2016-06-09 | Ospicon Company Limited | Flexible optic fiber sensor film, mat structure comprising the same and method of use of the mat structure |
CN105769118B (en) * | 2014-12-15 | 2019-07-05 | 汇嘉健康生活科技股份有限公司 | Optical fiber inductive layer and its monitoring system |
CN105796076B (en) * | 2014-12-31 | 2020-11-06 | 汇嘉健康生活科技股份有限公司 | Optical fiber type continuous detection type blood pressure sensor and wearing device thereof |
US10743797B2 (en) | 2015-08-27 | 2020-08-18 | Shenzhen Darma Technology Co. Ltd. | Fiber-optic sensors and methods for monitoring micro-movements |
CN105606276B (en) * | 2015-12-24 | 2018-06-12 | 中北大学 | MEMS optical fiber micro-bending pressure sensors and preparation method thereof |
CN107063434A (en) * | 2017-05-24 | 2017-08-18 | 苏州至禅光纤传感技术有限公司 | A kind of distributed vibration sensing method based on special optical fiber |
DK181212B1 (en) * | 2017-08-07 | 2023-05-09 | Talos Cybernetics ApS | A bidirectional brain-computer interface based on a novel optical sensor that measures muscle contractions through changes in surface topology |
EP3743682A4 (en) | 2018-01-24 | 2021-10-13 | Humanetics Innovative Solutions, Inc. | Fiber optic system for detecting forces on and measuring deformation of an anthropomorphic test device |
GB201811050D0 (en) * | 2018-07-05 | 2018-08-22 | Ergo Figure Ltd | A measurement device |
EP3928071A4 (en) | 2019-02-20 | 2022-11-16 | Humanetics Innovative Solutions, Inc. | Optical fiber system having helical core structure for detecting forces during a collision test |
US11162825B2 (en) | 2019-02-26 | 2021-11-02 | Humanetics Innovative Solutions, Inc. | System and method for calibrating an optical fiber measurement system |
JP7134438B2 (en) * | 2019-09-11 | 2022-09-12 | 学校法人 創価大学 | fiber optic sensor |
US11958406B2 (en) | 2020-11-18 | 2024-04-16 | Inteva Products, Llc | Illuminated stitching that provides vehicle status |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3789667A (en) * | 1972-02-14 | 1974-02-05 | Ladd Res Ind Inc | Fiber optic pressure detector |
US4937444A (en) * | 1982-09-29 | 1990-06-26 | Vpl Research, Inc. | Optical flex sensor |
US4692610A (en) * | 1986-01-30 | 1987-09-08 | Grumman Aerospace Corporation | Fiber optic aircraft load relief control system |
US4691708A (en) * | 1986-03-10 | 1987-09-08 | Cordis Corporation | Optical pressure sensor for measuring blood pressure |
US4745925A (en) * | 1986-10-06 | 1988-05-24 | Dietz Henry G | Optoelectronic inhalation sensor for monitoring inhalation and for inhalation therapy |
US4991590A (en) * | 1989-01-30 | 1991-02-12 | Martin Goffman Associates | Fiber optic intravascular blood pressure transducer |
US4972074A (en) * | 1989-04-10 | 1990-11-20 | Scott M. Wright | Optical attenuator movement detection system |
-
1990
- 1990-01-31 CA CA002130429A patent/CA2130429C/en not_active Expired - Fee Related
- 1990-01-31 CA CA002009033A patent/CA2009033C/en not_active Expired - Fee Related
- 1990-12-21 US US07/631,871 patent/US5134281A/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
CA2130429A1 (en) | 1991-08-01 |
US5134281A (en) | 1992-07-28 |
CA2009033C (en) | 1994-11-01 |
CA2130429C (en) | 1998-07-14 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EEER | Examination request | ||
MKLA | Lapsed |