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WO2009083407A1 - Capteur à fibre optique - Google Patents

Capteur à fibre optique Download PDF

Info

Publication number
WO2009083407A1
WO2009083407A1 PCT/EP2008/066973 EP2008066973W WO2009083407A1 WO 2009083407 A1 WO2009083407 A1 WO 2009083407A1 EP 2008066973 W EP2008066973 W EP 2008066973W WO 2009083407 A1 WO2009083407 A1 WO 2009083407A1
Authority
WO
WIPO (PCT)
Prior art keywords
fiber
reservoir
optic sensor
fiber optic
casing
Prior art date
Application number
PCT/EP2008/066973
Other languages
English (en)
Inventor
Can Meydanli
Original Assignee
Arcelik Anonim Sirketi
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 Arcelik Anonim Sirketi filed Critical Arcelik Anonim Sirketi
Publication of WO2009083407A1 publication Critical patent/WO2009083407A1/fr

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
    • G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
    • G01N21/7703—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator using reagent-clad optical fibres or optical waveguides
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
    • G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
    • G01N21/7703—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator using reagent-clad optical fibres or optical waveguides
    • G01N2021/7706—Reagent provision
    • G01N2021/7736—Reagent provision exposed, cladding free
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
    • G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
    • G01N2021/7769—Measurement method of reaction-produced change in sensor
    • G01N2021/7783—Transmission, loss
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
    • G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
    • G01N21/78—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator producing a change of colour
    • G01N21/81—Indicating humidity

Definitions

  • the present invention relates to a fiber optic sensor.
  • plastic or glass fibers having a light transporting core and a cladding thereon preventing light from escaping out
  • some portion of the cladding is removed, in lieu a material suitable for the property to be sensed is clad and the fiber is disposed between a receiver and an emitter to form a sensor.
  • a humidity sensor can be configured. The refraction index of the coating changes according to amount of moisture retained and the light with a certain wavelength entering from one end of the fiber is absorbed depending on the amount of retained moisture. Thus, the amount of light exiting from the other end decreases. By measuring the intensity of the entering and exiting light, the ambient moisture amount can be detected.
  • the sheaths used for protecting and transporting these sensors to the place of installation should be configured to maintain the full contact of the fiber ends to the light emitters and receivers and prevent these regions from being affected by another light source.
  • Various implementations are developed in the technique to be used for this purpose.
  • the coating being open to the milieu so that the fiber optic sensor can take readings with high accuracy, on the other hand obstructing the outside light from conning to the ends of the fiber aligned with the emitter and receiver and particularly protecting the part with the coating from external effects cannot be maintained.
  • Another problem is in straightening out the fiber cut from a bobbin with a certain length having an unevenness due to production and not being able to position between the emitter and the receiver so that the ends are in a linear axis.
  • the aim of the present invention is the realization of a fiber optic sensor that is enabled to take measurements effectively by being protected from external effects.
  • a fiber optic sensor realized in order to attain the aim of the present invention is explicated in the first claim and the other elements in the respective claims thereof.
  • the fiber optic sensor comprises a receiver, an emitter, a fiber and a sheath wherein these are emplaced.
  • the sheath comprises a retainer having a reservoir wherein the fiber is emplaced and two casings, which are disposed at both ends of the retainer, one that covers the emitter, the other the receiver light-proofingly.
  • the retainer furthermore comprises at least one slit arranged on the reservoir allowing air inflow into the reservoir. Air inflow is provided from the slits into the reservoir and thus the coating is enabled to retain the moisture in the medium.
  • the retainer furthermore comprises at least one wall that surrounds the reservoir with a space therebetween and that covers the slits.
  • the wall prevents the coating from damage in cases of water dripping on the sheath etc. and/or accuracy of measurement to be affected.
  • the retainer comprises at least two straighteners at two ends of the reservoir.
  • the straighteners are preferably cylindrical shaped and hold the fiber from the ends and accordingly maintain the fiber to remain virtually parallel to the horizontal.
  • the casings furthermore comprise an opening each, situated on the side of the body facing the retainer and when the straighteners at both ends of the retainer are placed therein the end of the fiber inside the straightener can be aligned with the receiver or the emitter in the casing.
  • the retainer is made of two pieces and the pieces are joined after the fiber is emplaced into the reservoir.
  • the reservoir comprises opposite recesses and protrusions on the bases of the pieces for joining the pieces.
  • the retainer is configured as two truncated cones joined from the bases.
  • an open space at the center of the reservoir, on the coating is allowed for ambient air to circulate, the ends of the reservoir get narrower so that the fiber ends are not misaligned by moving.
  • the straighteners on both ends of the reservoir are situated on the apexes of the truncated cone shaped pieces of the retainer.
  • the wall is configured as a rectangular prism with two sides open.
  • the retainer furthermore comprises at least two vertical uprights for joining the reservoir and the wall.
  • the casing furthermore comprises at least one latch and/or leg on the base. These latches and/or legs are fitted into the holes on the electronic card so that the fiber optic sensor can be secured on the electronic card.
  • the fiber optic sensor is packaged such that the coating can detect the moisture and take measurements correctly but is protected from external effects and the ends of the fiber are aligned with the receiver and the emitter in a lightproof manner.
  • Figure 1 - is the schematic view of the fiber optic sensor mounted on the electronic card.
  • Figure 2 - is the schematic cross sectional view of the sheath used in an embodiment of the present invention.
  • Figure 3 - is the perspective view of a piece of the retainer used in an embodiment of the present invention.
  • Figure 4 - is the schematic cross sectional view of a piece of the retainer used in an embodiment of the present invention.
  • Figure 5 - is the below perspective view of a casing used in an embodiment of the present invention.
  • Figure 6 - is the perspective view of an electronic card together with an emitter and a receiver.
  • Figure 7 - is the schematic view of the fiber used in an embodiment of the present invention.
  • the fiber optic sensor (1 ) comprises
  • the fiber (2) is configured as a cable and comprises
  • the sheath (8) comprises:
  • the retainer (9) comprises:
  • the casing (16) comprises an opening (18) situated thereon wherein the straightener (13) is emplaced. As the straightener (13) is disposed into the opening (18), the end of the fiber (2) inside the straightener (13) is aligned with the emitter (7) or the receiver (6) in the casing (16).
  • the reservoir (11) is configured as two truncated cones joined from the bases.
  • the straighteners (13) on both ends of the reservoir (11) are situated on the apexes of the truncated cones.
  • the wall (10) is configured as a rectangular prism with two sides open.
  • the retainer (9) furthermore comprises at least two vertical uprights (22) situated at the base levels of the two joined pieces of the reservoir (11) for joining the reservoir (11) and the wall (10).
  • the retainer (9) is made of two pieces and the pieces are joined after the fiber (2) is emplaced into the reservoir (11).
  • the reservoir (11) comprises opposite recesses (14) and protrusions (15) on the bases of the pieces.
  • the two halves of the reservoir (11) are joined by means of these recesses (14) and protrusions (15) being inserted into one another. Accordingly, the sheath (8) is easily assembled.
  • the pieces of the reservoir (11) are identical pieces and each one comprises two recesses (14) and two protrusions (15) on their bases respectively.
  • the reservoir (11) is formed by placing the two pieces base to base such that the recesses (14) are opposite the protrusions (15) and by seating the protrusions (15) into the recesses (14).
  • the reservoir (11) comprises 4 slits (12) arranged equidistantly.
  • the ambient air can flow unto the coating (5) to enable effective measurement.
  • the casing (16) furthermore comprises at least one latch (17) and/or leg (19) on the base, which are fitted into the holes (H) on the electronic card (E) so that the fiber optic sensor (1) can be secured on the electronic card (E).
  • the casing (16) comprises an annular step (20) on the periphery of the opening (18).
  • the step (20) provides ease of positioning and assembly while the straightener (13) is emplaced into the opening (18).
  • the casing (16) comprises at least one pusher (21) that helps the aligning of the emitter (7) and the receiver (6) contained therein by pressing from the top or the sides.
  • the pusher (21) in case the initial position of the emitter (7) is inclined, for example, pushes the emitter (7) to align coaxially with the straightener (13) during the assembly.
  • the casing (16) and the wall (10) are preferably painted to be lightproof or coated with a light reflecting coating.
  • the fiber optic sensor (1 ) of the present invention is mounted on the electronic card (E) such that the coating (5) is in contact with ambient air but the coating (5) is protected from external effects and the outside light does not act on the ends of the fiber (2) and hence measurement can be taken with a high precision.

Landscapes

  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Plasma & Fusion (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

La présente invention porte sur un capteur à fibre optique (1) qui comporte une fibre (2) ayant un récepteur (6) et un émetteur (7), une âme (3) disposée entre le récepteur (6) et l'émetteur (7), une gaine (4) qui entoure ladite âme (4) et un revêtement (5) appliqué dans la partie de la gaine (4) éliminé par des procédés chimiques ou mécaniques et une enveloppe (8) dans laquelle la fibre (2) est placée.
PCT/EP2008/066973 2007-12-31 2008-12-06 Capteur à fibre optique WO2009083407A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR200709225 2007-12-31
TRA2007/09225 2007-12-31

Publications (1)

Publication Number Publication Date
WO2009083407A1 true WO2009083407A1 (fr) 2009-07-09

Family

ID=40439211

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2008/066973 WO2009083407A1 (fr) 2007-12-31 2008-12-06 Capteur à fibre optique

Country Status (2)

Country Link
TR (1) TR201005127T1 (fr)
WO (1) WO2009083407A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0298333A1 (fr) * 1987-07-07 1989-01-11 Siemens Aktiengesellschaft Senseur pour gaz ou ions
JPH01193628A (ja) * 1988-01-28 1989-08-03 Hitachi Cable Ltd 平均湿度の測定方法
DE9001289U1 (de) * 1989-02-17 1990-04-12 Siemens AG, 1000 Berlin und 8000 München Gassensor
US5337376A (en) * 1993-04-19 1994-08-09 Hughes Aircraft Company Chemically sensitive fiber optic cable
DE4304545A1 (de) * 1993-02-11 1994-08-18 Felten & Guilleaume Energie Sensorkabel
WO2004044547A2 (fr) * 2002-11-05 2004-05-27 Kenneth Susko Dispositif de controle d'oxygene
US20070058898A1 (en) * 2005-06-30 2007-03-15 Infoscitex Humidity sensor and method for monitoring moisture in concrete

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0298333A1 (fr) * 1987-07-07 1989-01-11 Siemens Aktiengesellschaft Senseur pour gaz ou ions
JPH01193628A (ja) * 1988-01-28 1989-08-03 Hitachi Cable Ltd 平均湿度の測定方法
DE9001289U1 (de) * 1989-02-17 1990-04-12 Siemens AG, 1000 Berlin und 8000 München Gassensor
DE4304545A1 (de) * 1993-02-11 1994-08-18 Felten & Guilleaume Energie Sensorkabel
US5337376A (en) * 1993-04-19 1994-08-09 Hughes Aircraft Company Chemically sensitive fiber optic cable
WO2004044547A2 (fr) * 2002-11-05 2004-05-27 Kenneth Susko Dispositif de controle d'oxygene
US20070058898A1 (en) * 2005-06-30 2007-03-15 Infoscitex Humidity sensor and method for monitoring moisture in concrete

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
JINDAL ET AL: "High dynamic range fiber optic relative humidity sensor", OPTICAL ENGINEERING, SOC. OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS, BELLINGHAM, vol. 41, no. 5, 1 May 2002 (2002-05-01), pages 1093 - 1094, XP002987823, ISSN: 0091-3286 *

Also Published As

Publication number Publication date
TR201005127T1 (tr) 2010-11-22

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