CA2471401A1 - Packaged optical sensors on the side of optical fibres - Google Patents

Packaged optical sensors on the side of optical fibres Download PDF

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Publication number
CA2471401A1
CA2471401A1 CA002471401A CA2471401A CA2471401A1 CA 2471401 A1 CA2471401 A1 CA 2471401A1 CA 002471401 A CA002471401 A CA 002471401A CA 2471401 A CA2471401 A CA 2471401A CA 2471401 A1 CA2471401 A1 CA 2471401A1
Authority
CA
Canada
Prior art keywords
optical
optical sensor
sensing
sensor according
fibre
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
CA002471401A
Other languages
French (fr)
Other versions
CA2471401C (en
Inventor
Daniel Cantin
Marc Levesque
Alain Cournoyer
Julie Frechette
Sylvain Plante
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.)
Institut National dOptique
Original Assignee
Individual
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 CA002372637A external-priority patent/CA2372637A1/en
Application filed by Individual filed Critical Individual
Priority to CA2471401A priority Critical patent/CA2471401C/en
Publication of CA2471401A1 publication Critical patent/CA2471401A1/en
Application granted granted Critical
Publication of CA2471401C publication Critical patent/CA2471401C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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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
    • G01K11/3206—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 at discrete locations in the fibre, e.g. using Bragg scattering
    • 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
    • G01D5/35383—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 multiple sensor devices using multiplexing techniques

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
  • Investigating Or Analysing Materials By The Use Of Chemical Reactions (AREA)
  • Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)

Abstract

The present invention concerns an optical sensor located on the side of an optical fibre. An optical fibre having two opposite ends, a core and a cladding and at least one sensing area is disclosed. Each of the sensing areas is located between the two opposite ends and each has a longitudinal and radial portion of the fibre that has been removed and replaced by a sensing material. The luminescent light is thus representative of a parameter to be measured, such as temperature. Placing the sensing material in a side portion of the fibre increases the sensitivity of the sensor, particularly when it comes to temperature measurement in vivo.

Claims (26)

1. An optical sensor comprising an optical fibre for conveying a light beam, said optical fibre being provided with a first end for receiving said light beam and a second end opposed thereto, a core and a cladding surrounding said core, and at least one claddingless portion having a longitudinal, a radial and an azimuthal extent, each of said at least one claddingless portion defining a shaped cavity extending in said optical fibre between said two opposite ends, said optical sensor further comprising a sensing material extending in each of said cavities for forming a sensing area therein in contact relationship with said core.
2. The optical sensor according to claim 1, wherein at least one of said cavities extends radially inside said core.
3. The optical sensor according to claim 1, wherein said optical fibre has a predetermined permanent shape for projecting at least one of said at least one sensing area outwardly.
4. The optical sensor according to claim 1, wherein each of said at least one sensing area extends in a longitudinal alignment relationship with each others, each of said at least one sensing area being separated to each others by a predetermined distance.
5. The optical sensor according to claim 1, wherein each of said at least one sensing area extends in an azimuthal alignment relationship with each others around said optical fibre, each of said at least one sensing area being separated to each others by a predetermined distance.
6. The optical sensor according to claim 1, wherein said core having a refractive index, said sensing material has a refractive index greater than or equal to the refractive index of the core.
7. The optical sensor according to claim 1, wherein the sensing material is a luminescent material.
8. The optical sensor according to claim 1, wherein the sensing material has spectral optical properties sensitive to a concentration of a chemical or a biochemical compound.
9. The optical sensor according to claim 1, wherein the sensing material has spectral optical properties sensitive to a presence of a .chemical or a biochemical compound.
10. The optical sensor according to claim 1, wherein the sensing material is a transparent material.
11. The optical sensor according to claim 1, further comprising a thermally conductive coating surrounding said sensing material.
12. The optical sensor according to claim 1, further comprising a reflecting film extending on said sensing material.
13. The optical sensor according to claim 1, wherein said cavity is formed by a chemical etching process.
14. The optical sensor according to claim 1, wherein said cavity is formed by laser processing.
15. The optical sensor according to claim 1, wherein said optical fibre is a multimode optical fibre.
16. The optical sensor according to claim 1, wherein the second end of the optical fibre is provided with an index matching material.
17. The optical sensor according to claim 1, further comprising a reflector extending radially inside said optical fibre between the sensing area and the second end of the optical fibre, said reflector extending closed to the sensing area.
18. The optical sensor according to claim 17, wherein said reflector extends angularly inside said fibre.
19. The optical sensor according to claim 17, wherein said reflector is a fibre Bragg grating.
20. An optical sensing system comprising:
at least, one optical sensor, each comprising an .optical fibre for conveying a light beam, said optical fibre being provided with a first end for receiving said light beam and a second end opposed thereto, a core and a cladding surrounding said core, and at least one claddingless portion having a longitudinal, a radial and an azimuthal extent, each of said at least one claddingless portion defining a shaped cavity extending in said optical fibre between said two opposite ends, said optical sensor further comprising a sensing material extending in each of said cavities for forming a sensing area therein in contact relationship with said core;
a light source for injecting light into the first end of the optical fibre of each of said at least one optical sensor;
a detector operatively connected to one of said ends of said optical fibre of each of said at least one optical sensor for detecting light coming from each of said sensing areas; and an analyser operatively connected to said detector for analysing light coming from each of said sensing areas.
21. An optical sensing system according to claim 20, wherein said system is a temperature sensing system.
22. An optical sensing system according to claim 20, wherein said system is a pH concentration measuring system.
23. An optical sensing system according to claim 20, wherein said system is a CO2 concentration measuring system.
24. An optical sensing system according to claim 20, wherein said system is a CO2 concentration measuring system.
25. An optical sensing system according to claim 20, wherein said system is a glucose concentration measuring system.
26. An optical sensing system according to claim 20, wherein said system is a biological tissue identifying system.
CA2471401A 2002-02-20 2003-02-19 Packaged optical sensors on the side of optical fibres Expired - Fee Related CA2471401C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA2471401A CA2471401C (en) 2002-02-20 2003-02-19 Packaged optical sensors on the side of optical fibres

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CA2,372,637 2002-02-20
CA002372637A CA2372637A1 (en) 2002-02-20 2002-02-20 Packaged optical sensors on the side of optical fibres
PCT/CA2003/000235 WO2003071235A1 (en) 2002-02-20 2003-02-19 Packaged optical sensors on the side of optical fibres
CA2471401A CA2471401C (en) 2002-02-20 2003-02-19 Packaged optical sensors on the side of optical fibres

Publications (2)

Publication Number Publication Date
CA2471401A1 true CA2471401A1 (en) 2003-08-28
CA2471401C CA2471401C (en) 2012-08-21

Family

ID=32928319

Family Applications (1)

Application Number Title Priority Date Filing Date
CA2471401A Expired - Fee Related CA2471401C (en) 2002-02-20 2003-02-19 Packaged optical sensors on the side of optical fibres

Country Status (1)

Country Link
CA (1) CA2471401C (en)

Also Published As

Publication number Publication date
CA2471401C (en) 2012-08-21

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Effective date: 20200219